A search for pulsars around Sgr A* in the first Event Horizon Telescope data set

dc.contributor.authorTorne, Pablo
dc.contributor.authorLiu, Kuo
dc.contributor.authorEatough, Ralph P.
dc.contributor.authorWongphechauxsorn, Jompoj
dc.contributor.authorCordes, James M.
dc.contributor.authorDesvignes, Gregory
dc.contributor.authorDe Laurentis, Mariafelicia
dc.contributor.authorKramer, Michael
dc.contributor.authorRansom, Scott M.
dc.contributor.authorChatterjee, Shami
dc.contributor.authorWharton, Robert
dc.contributor.authorKaruppusamy, Ramesh
dc.contributor.authorBlackburn, Lindy
dc.contributor.authorJanssen, Michael
dc.contributor.authorChan, Chi-kwan
dc.contributor.authorCrew, Geoffrey, B.
dc.contributor.authorMatthews, Lynn D.
dc.contributor.authorGoddi, Ciriaco
dc.contributor.authorRottmann, Helge
dc.contributor.authorWagner, Jan
dc.contributor.authorSanchez, Salvador
dc.contributor.authorRuiz, Ignacio
dc.contributor.authorAbbate, Federico
dc.contributor.authorBower, Geoffrey C.
dc.contributor.authorSalamanca, Juan J.
dc.contributor.authorGomez-Ruiz, Arturo I.
dc.contributor.authorHerrera-Aguilar, Alfredo
dc.contributor.authorJiang, Wu
dc.contributor.authorLu, Ru-Sen
dc.contributor.authorPen, Ue-Li
dc.contributor.authorRaymond, Alexander W.
dc.contributor.authorShao, Lijing
dc.contributor.authorShen, Zhiqiang
dc.contributor.authorPaubert, Gabriel
dc.contributor.authorSánchez-Portal, Miguel
dc.contributor.authorKramer, Carsten
dc.contributor.authorCastillo, Manuel
dc.contributor.authorNavarro, Santiago
dc.contributor.authorJohn, David
dc.contributor.authorSchuster, Karl-Friedrich
dc.contributor.authorJohnson, Michael D.
dc.contributor.authorRygl, Kazi L. J.
dc.contributor.authorAkiyama, Kazunori
dc.contributor.authorAlberdi, Antxon
dc.contributor.authorAlef, Walter
dc.contributor.authorAlgaba, Juan Carlos
dc.contributor.authorAnantua, Richard
dc.contributor.authorAsada, Keiichi
dc.contributor.authorAzulay, Rebecca
dc.contributor.authorBach, Uwe
dc.contributor.authorBaczko, Anne-Kathrin
dc.contributor.authorBall, David
dc.contributor.authorBalokovic, Mislav
dc.contributor.authorBarrett, John
dc.contributor.authorBaubock, Michi
dc.contributor.authorBenson, Bradford A.
dc.contributor.authorBintley, Dan
dc.contributor.authorBlundell, Raymond
dc.contributor.authorBouman, Katherine L.
dc.contributor.authorBoyce, Hope
dc.contributor.authorBremer, Michael
dc.contributor.authorBrinkerink, Christiaan D.
dc.contributor.authorBrissenden, Roger
dc.contributor.authorBritzen, Silke
dc.contributor.authorBroderick, Avery E.
dc.contributor.authorBroguiere, Dominique
dc.contributor.authorBroguiere, Dominique
dc.contributor.authorBronzwaer, Thomas
dc.contributor.authorBustamante, Sandra
dc.contributor.authorByun, Do-Young
dc.contributor.authorCarlstrom, John E.
dc.contributor.authorCeccobello, Chiara
dc.contributor.authorChael, Andrew
dc.contributor.authorChang, Dominic O.
dc.contributor.authorChatterjee, Koushik
dc.contributor.authorChen, Ming-Tang
dc.contributor.authorChen (陈永军), Yongjun
dc.contributor.authorCheng, Xiaopeng
dc.contributor.authorCho, Ilje
dc.contributor.authorChristian, Pierre
dc.contributor.authorConroy, Nicholas S.
dc.contributor.authorConway, John E.
dc.contributor.authorCrawford, Thomas M.
dc.contributor.authorCruz-Osorio, Alejandro
dc.contributor.authorCui, Yuzhu
dc.contributor.authorDahale, Rohan
dc.contributor.authorDavelaar, Jordy
dc.contributor.authorDeane, Roger
dc.contributor.authorDempsey, Jessica
dc.contributor.authorDexter, Jason
dc.contributor.authorDhruv, Vedant
dc.contributor.authorDoeleman, Sheperd S.
dc.contributor.authorDougal, Sean
dc.contributor.authorDzib, Sergio A.
dc.contributor.authorEmami, Razieh
dc.contributor.authorFalcke, Heino
dc.contributor.authorFarah, Joseph
dc.contributor.authorFish, Vincent L.
dc.contributor.authorFomalont, Ed
dc.contributor.authorFord, H. Alyson
dc.contributor.authorFoschi, Marianna
dc.contributor.authorFraga-Encinas, Raquel
dc.contributor.authorFreeman, William T.
dc.contributor.authorFriberg, Per
dc.contributor.authorFromm, Christian M.
dc.contributor.authorFuentes, Antonio
dc.contributor.authorGalison, Peter
dc.contributor.authorGammie, Charles F.
dc.contributor.authorGarcia, Roberto
dc.contributor.authorGentaz, Olivier
dc.contributor.authorGeorgiev, Boris
dc.contributor.authorGold, Roman
dc.contributor.authorGomez, Jose L.
dc.contributor.authorGu (顾敏峰), Minfeng
dc.contributor.authorGurwell, Mark
dc.contributor.authorHada, Kazuhiro
dc.contributor.authorHaggard, Daryl
dc.contributor.authorHaworth, Kari
dc.contributor.authorHecht, Michael H.
dc.contributor.authorHesper, Ronald
dc.contributor.authorHeumann, Dirk
dc.contributor.authorHo (何子山), Luis C.
dc.contributor.authorHo, Paul
dc.contributor.authorHonma, Mareki
dc.contributor.authorHuang, Chih-Wei L.
dc.contributor.authorHuang (黄磊), Lei
dc.contributor.authorHughes, David H.
dc.contributor.authorIkeda, Shiro
dc.contributor.authorImpellizzeri, C. M. Violette
dc.contributor.authorInoue, Makoto
dc.contributor.authorIssaoun, Sara
dc.contributor.authorJames, David J.
dc.contributor.authorJannuzi, Buell T.
dc.contributor.authorJeter, Britton
dc.contributor.authorJiménez-Rosales, Alejandra
dc.contributor.authorJorstad, Svetlana
dc.contributor.authorJoshi, Abhishek, V.
dc.contributor.authorJung, Taehyun
dc.contributor.authorKarami, Mansour
dc.contributor.authorKawashima, Tomohisa
dc.contributor.authorKeating, Garrett K.
dc.contributor.authorKettenis, Mark
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorKim, Jae-Young
dc.contributor.authorKim, Jongsoo
dc.contributor.authorKim, Junhan
dc.contributor.authorKino, Motoki
dc.contributor.authorKoay, Jun Yi
dc.contributor.authorKocherlakota, Prashant
dc.contributor.authorKofuji, Yutaro
dc.contributor.authorKoyama, Shoko
dc.contributor.authorKrichbaum, Thomas P.
dc.contributor.authorKuo, Cheng-Yu
dc.contributor.authorLa Bella, Noemi
dc.contributor.authorLauer, Tod R.
dc.contributor.authorLee, Daeyoung
dc.contributor.authorLee, Sang-Sung
dc.contributor.authorLeung, Po Kin
dc.contributor.authorLevis, Aviad
dc.contributor.authorLi (李志远), Zhiyuan
dc.contributor.authorLico, Rocco
dc.contributor.authorLindahl, Greg
dc.contributor.authorLindqvist, Michael
dc.contributor.authorLisakov, Mikhail
dc.contributor.authorLiu, Jun
dc.contributor.authorLiuzzo, Elisabetta
dc.contributor.authorLo, Wen-Ping
dc.contributor.authorLobanov, Andrei P.
dc.contributor.authorLoinard, Laurent
dc.contributor.authorLonsdale, Colin J.
dc.contributor.authorMarchili, Nicola
dc.contributor.authorMarkoff, Sera
dc.contributor.authorMarrone, Daniel P.
dc.contributor.authorMarscher, Alan P.
dc.contributor.authorMarti-Vidal, Ivan
dc.contributor.authorMatsushita, Satoki
dc.contributor.authorMedeiros, Lia
dc.contributor.authorMenten, Karl M.
dc.contributor.authorMichalik, Daniel
dc.contributor.authorMizuno, Izumi
dc.contributor.authorMizuno, Yosuke
dc.contributor.authorMoran, James M.
dc.contributor.authorMoriyama, Kotaro
dc.contributor.authorMoscibrodzka, Monika
dc.contributor.authorMuller, Cornelia
dc.contributor.authorMuller, Hendrik
dc.contributor.authorMus, Alejandro
dc.contributor.authorMusoke, Gibwa
dc.contributor.authorMyserlis, Ioannis
dc.contributor.authorNadolski, Andrew
dc.contributor.authorNagai, Hiroshi
dc.contributor.authorNagar, Neil M.
dc.contributor.authorNakamura, Masanori
dc.contributor.authorNarayan, Ramesh
dc.contributor.authorNarayanan, Gopal
dc.contributor.authorNatarajan, Iniyan
dc.contributor.authorNathanail, Antonios
dc.contributor.authorNeilsen, Joey
dc.contributor.authorNeri, Roberto
dc.contributor.authorNi, Chunchong
dc.contributor.authorNoutsos, Aristeidis
dc.contributor.authorNowak, Michael A.
dc.contributor.authorOh, Junghwan
dc.contributor.authorOkino, Hiroki
dc.contributor.authorOlivares, Hector
dc.contributor.authorOrtiz-Leon, Gisela N.
dc.contributor.authorOyama, Tomoaki
dc.contributor.authorÖzel, Feryal
dc.contributor.authorPalumbo, Daniel C. M.
dc.contributor.authorParaschos, Georgios Filippos
dc.contributor.authorPark, Jongho
dc.contributor.authorParsons, Harriet
dc.contributor.authorPatel, Nimesh
dc.contributor.authorPesce, Dominic W.
dc.contributor.authorPiétu, Vincent
dc.contributor.authorPlambeck, Richard
dc.contributor.authorPopStefanija, Aleksandar
dc.contributor.authorPorth, Oliver
dc.contributor.authorPötzl, Felix M.
dc.contributor.authorPrather, Ben
dc.contributor.authorPreciado-López, Jorge A.
dc.contributor.authorPsaltis, Dimitrios
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dc.contributor.authorRamakrishnan, Venkatessh
dc.contributor.authorRao, Ramprasad
dc.contributor.authorRawlings, Mark G.
dc.contributor.authorRezzolla, Luciano
dc.contributor.authorRicarte, Angelo
dc.contributor.authorRipperda, Bart
dc.contributor.authorRoelofs, Freek
dc.contributor.authorRogers, Alan
dc.contributor.authorRos, Eduardo
dc.contributor.authorRomero-Canizales, Cristina
dc.contributor.authorRoshanineshat, Arash
dc.contributor.authorRoy, Alan L.
dc.contributor.authorRuszczyk, Chet
dc.contributor.authorSanchez-Arguelles, David
dc.contributor.authorSasada, Mahito
dc.contributor.authorSatapathy, Kaushik
dc.contributor.authorSavolainen, Tuomas
dc.contributor.authorSchloerb, F. Peter
dc.contributor.authorSchonfeld, Jonathan
dc.contributor.authorSmall, Des
dc.contributor.authorSohn, Bong Won
dc.contributor.authorSooHoo, Jason
dc.contributor.authorSouccar, Kamal
dc.contributor.authorSun, He
dc.contributor.authorTetarenko, Alexandra J.
dc.contributor.authorTiede, Paul
dc.contributor.authorTilanus, Remo P. J.
dc.contributor.authorTitus, Michael
dc.contributor.authorToscano, Teresa
dc.contributor.authorTraianou, Efthalia
dc.contributor.authorTrent, Tyler
dc.contributor.authorTrippe, Sascha
dc.contributor.authorTurk, Matthew
dc.contributor.authorVan Bemmel, Ilse
dc.contributor.authorvan Langevelde, Huib Jan
dc.contributor.authorVan Rossum, Daniel R.
dc.contributor.authorVos, Jesse
dc.contributor.authorWard-Thompson, Derek
dc.contributor.authorWardle, John
dc.contributor.authorWeintroub, Jonathan
dc.contributor.authorWex, Norbert
dc.contributor.authorWielgus, Maciek
dc.contributor.authorWiik, Kaj
dc.contributor.authorWitzel, Gunther
dc.contributor.authorWondrak, Michael F.
dc.contributor.authorWong, George N.
dc.contributor.authorWu, Qingwen
dc.contributor.authorYadlapalli, Nitika
dc.contributor.authorYamaguchi, Paul
dc.contributor.authorYfantis, Aristomenis
dc.contributor.authorYoon, Doosoo
dc.contributor.authorYoung, Andre
dc.contributor.authorYoung, Ken
dc.contributor.authorYounsi, Ziri
dc.contributor.authorYu, Wei
dc.contributor.authorYuan, Feng
dc.contributor.authorYuan, Ye-Fei
dc.contributor.authorZensus, J. Anton
dc.contributor.authorZhang, Shuo
dc.contributor.authorZhao, Guang-Yao
dc.contributor.authorZhao, Shan-Shan
dc.date.accessioned2024-10-03T10:36:04Z
dc.date.available2024-10-03T10:36:04Z
dc.date.issued2023-12-10
dc.description.abstractIn 2017 the Event Horizon Telescope (EHT) observed the supermassive black hole at the center of the Milky Way, Sagittarius A* (Sgr A*), at a frequency of 228.1 GHz (λ = 1.3 mm). The fundamental physics tests that even a single pulsar orbiting Sgr A* would enable motivate searching for pulsars in EHT data sets. The high observing frequency means that pulsars—which typically exhibit steep emission spectra—are expected to be very faint. However, it also negates pulse scattering, an effect that could hinder pulsar detections in the Galactic center. Additionally, magnetars or a secondary inverse Compton emission could be stronger at millimeter wavelengths than at lower frequencies. We present a search for pulsars close to Sgr A* using the data from the three most sensitive stations in the EHT 2017 campaign: the Atacama Large Millimeter/submillimeter Array, the Large Millimeter Telescope, and the IRAM 30 m Telescope. We apply three detection methods based on Fourier-domain analysis, the fast folding algorithm, and single-pulse searches targeting both pulsars and burst-like transient emission. We use the simultaneity of the observations to confirm potential candidates. No new pulsars or significant bursts were found. Being the first pulsar search ever carried out at such high radio frequencies, we detail our analysis methods and give a detailed estimation of the sensitivity of the search. We conclude that the EHT 2017 observations are only sensitive to a small fraction (2.2%) of the pulsars that may exist close to Sgr A*, motivating further searches for fainter pulsars in the region.en_US
dc.description.departmentPhysicsen_US
dc.description.librarianam2024en_US
dc.description.sdgNoneen_US
dc.description.sponsorshipACKNOWLEDGEMENTS : We are grateful to the anonymous referee for the review and providing suggestions that improved the manuscript. We thank the staff at the participating observatories and correlator centers that made possible the EHT 2017 observations. P.T. thanks Pablo Mellado and William Robertson for their support through several stages of the data reduction in the IRAM servers. R.P.E. is funded by the Chinese Academy of Sciences President’s International Fellowship Initiative, grant No. 2021FSM0004. S.M.R. is a CIFAR Fellow and is supported by the NSF Physics Frontiers Center awards 1430284 and 2020265. This work was supported by the European Research Council Synergy Grant “Black- HoleCam: Imaging the Event Horizon of Black Holes” (grant 610058). This paper makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.01404.V. ALMA is a partnership of the European Southern Observatory (ESO; Europe, representing its member states), NSF, and National Institutes of Natural Sciences of Japan, together with National Research Council (Canada), Ministry of Science and Technology (MOST; Taiwan), Academia Sinica Institute of Astronomy and Astrophysics (ASIAA; Taiwan), and Korea Astronomy and Space Science Institute (KASI; Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, Associated Universities, Inc. (AUI)/NRAO, and the National Astronomical Observatory of Japan (NAOJ). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The LMT is a project operated by the Instituto Nacional de Astrófisica, Óptica, y Electrónica (Mexico) and the University of Massachusetts at Amherst (USA). This work is partly based on observations carried out with the IRAM 30m Telescope under project No. 084-17. The IRAM 30m Telescope on Pico Veleta, Spain is operated by IRAM and supported by CNRS (Centre National de la Recherche Scientifique, France), MPG (Max- Planck-Gesellschaft, Germany), and IGN (Instituto Geográfico Nacional, Spain). This research has made use of NASA’s Astrophysics Data System Bibliographic Services. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The Event Horizon Telescope Collaboration thanks the following organizations and programs: the Academia Sinica; the Academy of Finland (projects 274477, 284495, 312496, and 315721); the Agencia Nacional de Investigación y Desarrollo (ANID), Chile via NCN19_058 (TITANs) and Fondecyt 1221421, the Alexander von Humboldt Stiftung; an Alfred P. Sloan Research Fellowship; Allegro, the European ALMA Regional Centre node in the Netherlands, the NL astronomy research network NOVA and the astronomy institutes of the University of Amsterdam, Leiden University and Radboud University; the ALMA North America Development Fund; the Astrophysics and High Energy Physics program by MCIN (with funding from European Union NextGenerationEU, PRTR-C17I1); the Black Hole Initiative, which is funded by grants from the John Templeton Foundation and the Gordon and Betty Moore Foundation (although the opinions expressed in this work are those of the author(s) and do not necessarily reflect the views of these Foundations); theBrinson Foundation; Chandra DD7-18089X and TM6-17006X; the China Scholarship Council; the China Postdoctoral Science Foundation fellowships (2020M671266, 2022M712084); Consejo Nacional de Ciencia y Tecnología (CONACYT, Mexico, projects U0004- 246083, U0004-259839, F0003-272050, M0037-279006, F0003- 281692, 104497, 275201, and 263356); the Consejería de Economía, Conocimiento, Empresas y Universidad of the Junta de Andalucía (grant P18-FR-1769), the Consejo Superior de Investigaciones Científicas (grant 2019AEP112); the Delaney Family via the Delaney Family John A. Wheeler Chair at Perimeter Institute; Dirección General de Asuntos del Personal Académico-Universidad Nacional Autónoma de México (DGAPA-UNAM, projects IN112417 and IN112820); the Dutch Organization for Scientific Research (NWO) for VICI award (grant 639.043.513), grant OCENW.KLEIN.113 and the Dutch black hole Consortium (with project No. NWA 1292.19.202) of the research program the National Science Agenda; the Dutch National Supercomputers, Cartesius and Snellius (NWO grant 2021.013); the EACOA Fellowship awarded by the East Asia Core Observatories Association, which consists of the Academia Sinica Institute of Astronomy and Astrophysics, the National Astronomical Observatory of Japan, Center for Astronomical Mega-Science, Chinese Academy of Sciences, and the Korea Astronomy and Space Science Institute; the European Union Horizon 2020 research and innovation program under grant agreements RadioNet (No 730562) and M2FINDERS (No 101018682); the Horizon ERC Grants 2021 program under grant agreement No. 101040021; the Generalitat Valenciana (grants APOSTD/2018/177 and ASFAE/2022/018) and GenT Program (project CIDEGENT/ 2018/021); MICINN Research Project PID2019-108995GB-C22; the European Research Council for advanced grant “JETSET: Launching, propagation and emission of relativistic jets from binary mergers and across mass scales” (grant No. 884631); the Institute for Advanced Study; the Istituto Nazionale di Fisica Nucleare (INFN) sezione di Napoli, iniziative specifiche TEONGRAV; the International Max Planck Research School for Astronomy and Astrophysics at the Universities of Bonn and Cologne; DFG research grant “Jet physics on horizon scales and beyond” (grant No. FR 4069/2-1); Joint Columbia/Flatiron Postdoctoral Fellowship, research at the Flatiron Institute is supported by the Simons Foundation; the Japan Ministry of Education, Culture, Sports, Science and Technology (MEXT; grant JPMXP1020200109); the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for JSPS Research Fellowship (JP17J08829); the Joint Institute for Computational Fundamental Science, Japan; the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS, grants QYZDJ-SSWSLH057, QYZDJSSW-SYS008, ZDBS-LY-SLH011); the Leverhulme Trust Early Career Research Fellowship; the Max-Planck- Gesellschaft (MPG); the Max Planck Partner Group of the MPG and the CAS; the MEXT/JSPS KAKENHI (grants 18KK0090, JP21H01137, JP18H03721, JP18K13594, 18K03709, JP19K14761, 18H01245, 25120007); the Malaysian Fundamental Research Grant Scheme (FRGS) FRGS/1/2019/STG02/UM/ 02/6; the MIT International Science and Technology Initiatives (MISTI) Funds; the Ministry of Science and Technology (MOST) of Taiwan (103-2119-M-001-010-MY2, 105-2112-M-001-025- MY3, 105-2119-M-001-042, 106-2112-M-001-011, 106-2119-M- 001-013, 106-2119-M-001-027, 106-2923-M-001-005, 107-2119- M-001-017, 107-2119-M-001-020, 107-2119-M-001-041, 107- 2119-M-110-005, 107-2923-M-001-009, 108-2112-M-001-048, 108-2112-M-001-051, 108-2923-M-001-002, 109-2112-M-001- 025, 109-2124-M-001-005, 109-2923-M-001-001, 110-2112-M- 003-007-MY2, 110-2112-M-001-033, 110-2124-M-001-007, and 110-2923-M-001-001); the Ministry of Education (MoE) of Taiwan Yushan Young Scholar Program; the Physics Division, National Center for Theoretical Sciences of Taiwan; the National Aeronautics and Space Administration (NASA, Fermi Guest Investigator grant 80NSSC20K1567, NASA Astrophysics Theory Program grant 80NSSC20K0527, NASA NuSTAR award 80NSSC20K0645); NASA Hubble Fellowship grants HST-HF2- 51431.001-A, HST-HF2-51482.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555; the National Institute of Natural Sciences (NINS) of Japan; the National Key Research and Development Program of China (grant 2016YFA0400704, 2017YFA0402703, 2016YFA0400702); the National Science Foundation (NSF, grants AST-0096454, AST-0352953, AST- 0521233, AST-0705062, AST-0905844, AST-0922984, AST- 1126433, AST-1140030, DGE-1144085, AST-1207704, AST- 1207730, AST-1207752, MRI-1228509, OPP-1248097, AST- 1310896, AST-1440254, AST-1555365, AST-1614868, AST- 1615796, AST-1715061, AST-1716327, AST-1716536, OISE- 1743747, AST-1816420, AST-1935980, AST-2034306); NSF Astronomy and Astrophysics Postdoctoral Fellowship (AST- 1903847); the Natural Science Foundation of China (grants 11650110427, 10625314, 11721303, 11725312, 11873028, 11933007, 11991052, 11991053, 12192220, 12192223); the Natural Sciences and Engineering Research Council of Canada (NSERC, including a Discovery Grant and the NSERC Alexander Graham Bell Canada Graduate Scholarships-Doctoral Program); the National Youth Thousand Talents Program of China; the National Research Foundation of Korea (the Global PhD Fellowship Grant: grants NRF-2015H1A2A1033752, the Korea Research Fellowship Program: NRF-2015H1D3A1066561, Brain Pool Program: 2019H1D3A1A01102564, Basic Research Support Grant 2019R1F1A1059721, 2021R1A6A3A01086420, 2022R1C1C1005255); Netherlands Research School for Astronomy (NOVA) Virtual Institute of Accretion (VIA) postdoctoral fellowships; Onsala Space Observatory (OSO) national infrastructure, for the provisioning of its facilities/observational support (OSO receives funding through the Swedish Research Council under grant 2017-00648); the Perimeter Institute for Theoretical Physics (research at Perimeter Institute is supported by the Government of Canada through the Department of Innovation, Science and Economic Development and by the Province of Ontario through the Ministry of Research, Innovation and Science); the Princeton Gravity Initiative; the Spanish Ministerio de Ciencia e Innovación (grants PGC2018-098915-B-C21, AYA2016-80889-P, PID2019-108995GB-C21, and PID2020- 117404GB-C21); the University of Pretoria for financial aid in the provision of the new Cluster Server nodes and SuperMicro (USA) for an SEEDING grant approved toward these nodes in 2020; the Shanghai Pilot Program for Basic Research, Chinese Academy of Science, Shanghai Branch (JCYJ-SHFY-2021-013); the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award for the Instituto de Astrofísica de Andalucía (SEV-2017-0709); the Spinoza Prize SPI 78-409; the South African Research Chairs Initiative, through the South African Radio Astronomy Observatory (SARAO, grant ID 77948), which is a facility of the National Research Foundation (NRF), an agency of the Department of Science and Innovation (DSI) of South Africa; the Toray Science Foundation; the Swedish Research Council (VR); the US Department of Energy (USDOE) through the Los Alamos National Laboratory (operated by Triad National Security, LLC, for the National Nuclear Security Administration of the USDOE (contract 89233218CNA000001); and the YCAA Prize Postdoctoral Fellowship. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under contract No. DE-AC05-00OR22725. We also thank the Center for Computational Astrophysics, National Astronomical Observatory of Japan. The computing cluster of Shanghai VLBI correlator supported by the Special Fund for Astronomy from the Ministry of Finance in China is acknowledged. This work was partially supported by FAPESP (Fundação de Amparo á Pesquisa do Estado de São Paulo) under grant 2021/01183-8. APEX is a collaboration between the Max-Planck-Institut für Radioastronomie (Germany), ESO, and the Onsala Space Observatory (Sweden). The SMT is operated by the Arizona Radio Observatory, a part of the Steward Observatory of the University of Arizona, with financial support of operations from the State of Arizona and financial support for instrumentation development from the NSF. Support for SPT participation in the EHT is provided by the National Science Foundation through award OPP-1852617 to the University of Chicago. Partial support is also provided by the Kavli Institute of Cosmological Physics at the University of Chicago. The SPT hydrogen maser was provided on loan from the GLT, courtesy of ASIAA. The SMA is a joint project between the SAO and ASIAA and is funded by the Smithsonian Institution and the Academia Sinica. The JCMT is operated by the East Asian Observatory on behalf of the NAOJ, ASIAA, and KASI, as well as the Ministry of Finance of China, Chinese Academy of Sciences, and the National Key Research and Development Program (No. 2017YFA0402700) of China and Natural Science Foundation of China grant 11873028. Additional funding support for the JCMT is provided by the Science and Technologies Facility Council (UK) and participating universities in the UK and Canada. We acknowledge the significance that Maunakea, where the SMA and JCMT EHT stations are located, has for the indigenous Hawaiian people. The EHTC has received generous donations of FPGA chips from Xilinx Inc., under the Xilinx University Program. The EHTC has benefited from technology shared under an open-source license by the Collaboration for Astronomy Signal Processing and Electronics Research (CASPER). The EHT project is grateful to T4Science and Microsemi for their assistance with Hydrogen Masers. We gratefully acknowledge the support provided by the extended staff of the ALMA, both from the inception of the ALMA Phasing Project through the observational campaigns of 2017 and 2018. We would like to thank A. Deller and W. Brisken for EHT-specific support with the use of DiFX. FACILITIES: ALMA, LMT, IRAM:30m. SOFTWARE : MPIvdif2psrfits, PRESTO (Ransom 2011), RIPTIDE (Morello et al. 2020), NUMPY (Harris et al. 2020), SCIPY (Virtanen et al. 2020), MATPLOTLIB (Hunter 2007), TEMPO (Nice et al. 2015), SIGPYPROC (Lorimer 2011).en_US
dc.description.urihttps://iopscience.iop.org/journal/0004-637Xen_US
dc.identifier.citationTorne, P., Liu, K., Eatough, R.P. et al. 2023, 'A search for pulsars around Sgr A* in the first event horizon telescope data set', The Astrophysical Journal, vol. 959, no. 14, pp. 1-27. https://DOI.org/10.3847/1538-4357/acf4f2.en_US
dc.identifier.issn0004-637X (print)
dc.identifier.issn1538-4357 (online)
dc.identifier.other10.3847/1538-4357/acf4f2
dc.identifier.urihttp://hdl.handle.net/2263/98486
dc.language.isoenen_US
dc.publisherAmerican Astronomical Societyen_US
dc.rights© 2023. The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.en_US
dc.subjectRadio pulsarsen_US
dc.subjectPulsarsen_US
dc.subjectMagnetarsen_US
dc.subjectNeutron starsen_US
dc.subjectBlack hole physicsen_US
dc.subjectPeriod searchen_US
dc.subjectSurveysen_US
dc.subjectInterstellar scatteringen_US
dc.subjectGalactic centeren_US
dc.subjectSupermassive black holesen_US
dc.subjectRadio transient sourcesen_US
dc.subjectMillimeter astronomyen_US
dc.subjectEvent Horizon Telescope (EHT)en_US
dc.titleA search for pulsars around Sgr A* in the first Event Horizon Telescope data seten_US
dc.typeArticleen_US

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