KFU. Card publication. SRG/ART-XC discovery of SRGA J204318.2+443815: Towards the complete population of faint X-ray pulsars

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SRG/ART-XC DISCOVERY OF SRGA J204318.2+443815: TOWARDS THE COMPLETE POPULATION OF FAINT X-RAY PULSARS

Form of presentation

Articles in international journals and collections

Year of publication

2022

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Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Bibliographic description in the original language

Lutovinov A.A, Tsygankov S.S, Mereminskiy I.A, SRG/ART-XC discovery of SRGA J204318.2+443815: Towards the complete population of faint X-ray pulsars//Astronomy and Astrophysics. - 2022. - Vol.661, Is.. - Art. �A28.

Annotation

We report the discovery of the new long-period X-ray pulsar SRGA J204318.2+443815/SRGe J204319.0+443820 in a Be binary system. The source was found in the second all-sky survey by the Mikhail Pavlinsky ART-XC telescope on board the SRG mission. The follow-up observations with XMM-Newton, NICER, and NuSTAR allowed us to discover a strong coherent signal in the source light curve with a period of ~742 s. The pulsed fraction was found to depend on an increase in energy from ~20% in soft X-rays to >50% at high energies, as is typical for X-ray pulsars. The source has a quite hard spectrum with an exponential cutoff at high energies and a bolometric luminosity of LX ≃ 4 × 1035 ergs-1. The X-ray position of the source is found to be consistent with the optical transient ZTF18abjpmzf, located at a distance of ~8.0 kpc. Dedicated optical and infrared observations with the RTT-150, NOT, Keck, and Palomar telescopes revealed a number of emission lines (Ha, He I, and the Paschen and Braket series) with a strongly absorbed continuum. According to the SRG scans and archival XMM-Newton data, the source flux is moderately variable (by a factor of 4-10) on timescales of several months and years. All this suggests that SRGA J204318.2+443815/SRGe J204319.0+443820 is a new quasi-persistent low-luminosity X-ray pulsar in a distant binary system with a Be-star of the B0-B2e class. Thus the SRG observatory allowed us to unveil a hidden population of faint objects, including a population of slowly rotating X-ray pulsars in Be systems.

Keywords

stars: neutron; X-rays: binaries; pulsars: individual: SRGAJ204318.2+443815;

The name of the journal

Astronomy and Astrophysics

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130642860&doi=10.1051%2f0004-6361%2f202141630&partnerID=40&md5=f400a41b0541bb923d056d931cb5e2ef

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=278985&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.date.accessioned	2022-01-01T00:00:00Z	ru_RU
dc.date.available	2022-01-01T00:00:00Z	ru_RU
dc.date.issued	2022	ru_RU
dc.identifier.citation	Lutovinov A.A, Tsygankov S.S, Mereminskiy I.A, SRG/ART-XC discovery of SRGA J204318.2+443815: Towards the complete population of faint X-ray pulsars//Astronomy and Astrophysics. - 2022. - Vol.661, Is.. - Art. �A28.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=278985&p_lang=2	ru_RU
dc.description.abstract	Astronomy and Astrophysics	ru_RU
dc.description.abstract	We report the discovery of the new long-period X-ray pulsar SRGA J204318.2+443815/SRGe J204319.0+443820 in a Be binary system. The source was found in the second all-sky survey by the Mikhail Pavlinsky ART-XC telescope on board the SRG mission. The follow-up observations with XMM-Newton, NICER, and NuSTAR allowed us to discover a strong coherent signal in the source light curve with a period of ~742 s. The pulsed fraction was found to depend on an increase in energy from ~20% in soft X-rays to >50% at high energies, as is typical for X-ray pulsars. The source has a quite hard spectrum with an exponential cutoff at high energies and a bolometric luminosity of LX ≃ 4 × 1035 ergs-1. The X-ray position of the source is found to be consistent with the optical transient ZTF18abjpmzf, located at a distance of ~8.0 kpc. Dedicated optical and infrared observations with the RTT-150, NOT, Keck, and Palomar telescopes revealed a number of emission lines (Ha, He I, and the Paschen and Braket series) with a strongly absorbed continuum. According to the SRG scans and archival XMM-Newton data, the source flux is moderately variable (by a factor of 4-10) on timescales of several months and years. All this suggests that SRGA J204318.2+443815/SRGe J204319.0+443820 is a new quasi-persistent low-luminosity X-ray pulsar in a distant binary system with a Be-star of the B0-B2e class. Thus the SRG observatory allowed us to unveil a hidden population of faint objects, including a population of slowly rotating X-ray pulsars in Be systems.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	SRG/ART-XC discovery of SRGA J204318.2+443815: Towards the complete population of faint X-ray pulsars	ru_RU
dc.type	Articles in international journals and collections	ru_RU