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A new redback pulsar candidate 4FGL J2054.2+6904.
- Source :
- Monthly Notices of the Royal Astronomical Society; Sep2023, Vol. 524 Issue 2, p3020-3025, 6p
- Publication Year :
- 2023
-
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<subscript>⊙</subscript> 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<superscript>−13</superscript> erg s<superscript>−1</superscript> cm<superscript>−2</superscript>. All the properties of 4FGL J2054.2+6904 and its presumed counterpart suggest that it is a member of the redback family. [ABSTRACT FROM AUTHOR]
- Subjects :
- PULSARS
SPECTRAL energy distribution
X-ray spectra
LIGHT curves
BINARY pulsars
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 524
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 170902794
- Full Text :
- https://doi.org/10.1093/mnras/stad1992