Affiliation:
1. Ioffe Institute , Politekhnicheskaya 26, St. Petersburg 194021 , Russia
2. Space Research Institute, Russian Academy of Sciences , Profsoyuznaya 84/32, Moscow 117997 Russia
3. Max-Planck-Institut für Astrophysik , Karl-Schwarzschild-Str. 1, D-85741 Garching , Germany
Abstract
ABSTRACT
The Fermi catalogue contains about 2000 unassociated γ-ray sources. Some of them were recently identified as pulsars, including so-called redbacks and black widows, which are millisecond pulsars in tight binary systems with non- and partially-degenerate low-mass stellar companions irradiated by the pulsar wind. We study a likely optical and X-ray counterpart of the Fermi source 4FGL J2054.2+6904 proposed earlier as a pulsar candidate. We use archival optical data as well as Swift/XRT and SRG/eROSITA X-ray data to clarify its nature. Using Zwicky Transient Facility data in g and r bands spanning over 4.7 yr, we find a period of ≈7.5 h. The folded light curve has a smooth sinusoidal shape with the peak-to-peak amplitude of ≈0.4 mag. The spectral fit to the optical spectral energy distribution of the counterpart candidate gives the star radius of 0.5 ± 0.1 R⊙ and temperature of 5500 ± 300 K implying a G2–G9-type star. Its X-ray spectrum is well fitted by an absorbed power law with the photon index of 1.0 ± 0.3 and unabsorbed flux of ≈2 × 10−13 erg s−1 cm−2. All the properties of 4FGL J2054.2+6904 and its presumed counterpart suggest that it is a member of the redback family.
Funder
University of Hawaii
Max Planck Society
The Johns Hopkins University
Durham University
University of Edinburgh
Harvard-Smithsonian Center for Astrophysics
Space Telescope Science Institute
National Aeronautics and Space Administration
Planetary Science Division
National Science Foundation
Eotvos Lorand University
Los Alamos National Laboratory
Gordon and Betty Moore Foundation
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Nature of 4FGL J1838.2+3223: A flaring ‘spider’ pulsar candidate;Monthly Notices of the Royal Astronomical Society;2023-11-16