A new redback pulsar candidate 4FGL J2054.2+6904

Abstract

The Fermi catalogue contains about 2000 unassociated $\gamma$-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 years, we find a period of $\approx$7.5 h. The folded light curve has a smooth sinusoidal shape with the peak-to-peak amplitude of $\approx$0.4 mag. The spectral fit to the optical spectral energy distribution of the counterpart candidate gives the star radius of 0.5$\pm$0.1$R_{\odot }$ and temperature of 5500$\pm$300 K implying a G2--G9-type star. Its X-ray spectrum is well fitted by an absorbed power law with the photon index of 1.0$\pm$0.3 and unabsorbed flux of $\approx 2\times 10^{-13}$ 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.

arXiv commentAccepted for publication in MNRAS, 6 pages, 6 figures

References in corpus (44)

• The Gaia mission
• Gaia Data Release 3: Summary of the content and survey properties
• On the Absorption of X-rays in the Interstellar Medium
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Understanding the Lomb-Scargle Periodogram
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The eROSITA X-ray telescope on SRG
• The Pan-STARRS1 Database and Data Products
• A Radio Pulsar/X-ray Binary Link
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Swings between rotation and accretion power in a millisecond binary pulsar
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• Peering into the dark side: magnesium lines establish a massive neutron star in PSR J2215+5135
• A state change in the low-mass X-ray binary XSS J12270-4859
• 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
• Formation of black widows and redbacks -- two distinct populations of eclipsing binary millisecond pulsars
• Discovery of PSR J1227-4853: A transition from a low-mass X-ray binary to a redback millisecond pulsar
• Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• Surrounded by Spiders! New Black Widows and Redbacks in the Galactic Field
• Optical spectroscopy and demographics of redback millisecond pulsar binaries
• Understanding the evolution of close binary systems with radio pulsars
• Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429
• Multiband Optical Light Curves of Black-Widow Pulsars
• A New Flaring Black Widow Candidate and Demographics of Black Widow Millisecond Pulsars in the Galactic Field
• The SNAD Viewer: Everything You Want to Know about Your Favorite ZTF Object
• TESS Input Catalog versions 8.1 and 8.2: Phantoms in the 8.0 Catalog and How to Handle Them
• Properties of the redback millisecond pulsar binary 3FGL J0212.1+5320
• Accretion-induced Collapse from Magnetic White Dwarf Binaries and Formation of Binary Millisecond Pulsars: Redbacks and Black Widows
• Black widow formation by pulsar irradiation and sustained magnetic braking
• A New Candidate Transitional Millisecond Pulsar in the Sub-luminous Disk State: 4FGL J0407.7--5702
• Multiwavelength Spectral Analysis and Neural Network Classification of Counterparts to 4FGL Unassociated Sources
• Discovery of a New Redback Millisecond Pulsar Candidate: 4FGL J0940.3-7610
• A New Likely Redback Millisecond Pulsar Binary with a Massive Neutron Star: 4FGL J2333.1--5527
• Formation of black widows through ultra-compact X-ray binaries with He star companions
• Photometry and Spectroscopy of the Optical Companion to the Pulsar PSR J1740-5340 in the Globular Cluster NGC 6397
• PSR J1306--40: An X-ray Luminous Redback with an Evolved Companion
• Heated Poles on the Companion of Redback PSR J2339$-$0533
• Multi-Wavelength Observations Of A New Redback Millisecond Pulsar 4FGL J1910.7-5320
• Optical detection of the black widow binary PSR J2052+1219
• Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

Cited by in corpus (3)

• Nature of 4FGL J1838.2+3223: a flaring `spider' pulsar candidate
• 4FGL J1544.2$-$2554: a new spider pulsar candidate
• Nature of 4FGL J2249.4+6229: Evidence for a redback system with a cool companion and low X-ray and $\gamma$-ray luminosities