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Multi-epoch searches for relativistic binary pulsars and fast transients in the Galactic Centre
Eatough, R. P.1,2; Torne, P.2,3; Desvignes, G.2,4; Kramer, M.2,5; Karuppusamy, R.2; Klein, B.2,6; Spitler, L. G.2; Lee, K. J.7; Champion, D. J.2; Liu, K.2; Wharton, R. S.2; Rezzolla, L.8,9,10; Falcke, H.2,11
2021-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume507Issue:4Pages:5053-5068
AbstractThe high stellar density in the central parsecs around the Galactic Centre makes it a seemingly favourable environment for finding relativistic binary pulsars. These include pulsars orbiting other neutron stars, stellar-mass black holes, or the central supermassive black hole, Sagittarius A*. Here, we present multi-epoch pulsar searches of the Galactic Centre at four observing frequencies, 4.85, 8.35, 14.6, 18.95 GHz, using the Effelsberg 100-m radio telescope. Observations were conducted 1 yr prior to the discovery of, and during monitoring observations of, the Galactic Centre magnetar PSR J1745-2900. Our data analysis features acceleration searches on progressively shorter time series to maintain sensitivity to relativistic binary pulsars. The multi-epoch observations increase the likelihood of discovering transient or nulling pulsars, or ensure orbital phases are observed at which acceleration search methods work optimally. In similar to 147 h of separate observations, no previously undiscovered pulsars have been detected. Through calibration observations, we conclude this might be due to insufficient instantaneous sensitivity, caused by the intense continuum emission from the Galactic Centre, its large distance, and, at higher frequencies, the aggregate effect of steep pulsar spectral indices and atmospheric contributions to the system temperature. Additionally, we find that for millisecond pulsars in wide circular orbits (less than or similar to 800 d) around Sagittarius A*, linear acceleration effects cannot be fully corrected in deep observations (9 h) with existing software tools. Pulsar searches of the Galactic Centre with the next generation of radio telescopes - such as MeerKat, ngVLA, and SKA1-mid - will have improved chances of uncovering this elusive population.
Keywordstars: magnetars pulsars: general Galaxy: centred
Funding OrganizationEuropean Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council
DOI10.1093/mnras/stab2344
WOS KeywordSUPERMASSIVE BLACK-HOLE ; SAGITTARIUS-A-ASTERISK ; ACCELERATION SEARCH ; RADIO PULSARS ; DISCOVERY ; SCATTERING ; CANDIDATE ; MAGNETAR ; DISTANCE ; PARSEC
Language英语
Funding ProjectEuropean Research Council[610058]
Funding OrganizationEuropean Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council ; European Research Council
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000702151300025
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/75216
Collection中国科学院国家天文台
Corresponding AuthorEatough, R. P.; Torne, P.
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
2.Max Planck Inst Radioastron, Auf Hugel 69, D-53121 Bonn, Germany
3.Inst Radioastron Millimetr IRAM, Nucleo Cent, Avda Divina Pastora 7, E-18012 Granada, Spain
4.Univ Paris, Lab Etud Spatiales & Instrumentat Astrophys, Univ Paris Sci & Lettres, Sorbonne Univ,Observ Paris,Ctr Natl Rech Sci, 5 Pl Jules Janssen, F-92195 Meudon, France
5.Univ Manchester, Jodrell Bank, Sch Phys & Astron, Ctr Astrophys, Manchester M13 9PL, Lancs, England
6.Bonn Rhein Sieg Univ Appl Sci, Grantham Allee 20, D-53757 St Augustin, Germany
7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
8.Goethe Univ, Inst Theoret Phys, Max Von Laue Str 1, D-60438 Frankfurt, Germany
9.Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany
10.Trinity Coll Dublin, Sch Math, Dublin D02 PN40 2, Ireland
11.Radboud Univ Nijmegen, Dept Astrophys, Inst Math Astrophys & Particle Phys IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands
Recommended Citation
GB/T 7714
Eatough, R. P.,Torne, P.,Desvignes, G.,et al. Multi-epoch searches for relativistic binary pulsars and fast transients in the Galactic Centre[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,507(4):5053-5068.
APA Eatough, R. P..,Torne, P..,Desvignes, G..,Kramer, M..,Karuppusamy, R..,...&Falcke, H..(2021).Multi-epoch searches for relativistic binary pulsars and fast transients in the Galactic Centre.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,507(4),5053-5068.
MLA Eatough, R. P.,et al."Multi-epoch searches for relativistic binary pulsars and fast transients in the Galactic Centre".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 507.4(2021):5053-5068.
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