Discovery of a Be/X-ray Binary Consistent with the Position of GRO J2058+42

Abstract

GRO J2058+42 is a 195 s transient X-ray pulsar discovered in 1995 with BATSE. In 1996, RXTE located GRO J2058+42 to a 90% confidence error circle with a 4' radius. On 20 February 2004, the region including the error circle was observed with Chandra ACIS-I. No X-ray sources were detected within the error circle, however, 2 faint sources were detected in the ACIS-I field-of-view. We obtained optical observations of the brightest object, CXOU J205847.5+414637, that had about 64 X-ray counts and was just 0.3' outside the error circle. The optical spectrum contained a strong H alpha line and corresponds to an infrared object in the 2MASS catalog, indicating a Be/X-ray binary system. Pulsations were not detected in the Chandra observations, but similar flux variations and distance estimates suggest that CXOU J205847.5+414637 and GRO J2058+42 are the same object. We present results from the Chandra observation, optical observations, new and previously unreported RXTE observations, and a reanalysis of a ROSAT observation.

arXiv comment18 pages, 6 figures, Accepted for publication in the Astrophysical Journal

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Cited by in corpus (19)

• The gas-to-extinction ratio and the gas distribution in the Galaxy
• Cooling of Accretion-Heated Neutron Stars
• The Ups & Downs of Accreting X-Ray Pulsars: Decade-long observations with the Fermi Gamma-Ray Burst Monitor
• Testing the deep-crustal heating model using quiescent neutron-star very-faint X-ray transients and the possibility of partially accreted crusts in accreting neutron stars
• Swift/BAT and RXTE Observations of the Peculiar X-ray Binary 4U 2206+54 - Disappearance of the 9.6 Day Modulation
• A 0535+26: Back in business
• Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy
• Discovery of a pulse-phase-transient cyclotron line in the X-ray pulsar GROJ2058+42
• Identification of the Infrared Counterpart to a Newly Discovered X-ray Source in the Galactic Center
• The quiescent state of the accreting X-ray pulsar SAX J2103.5+4545
• AstroSat observations of GRO J2058+42 during the 2019 outburst
• Optical variabilities in Be/X-ray binary system:GRO J2058+42
• Optical and X-ray Outbursts of Be/X-ray binary system SAX J2103.5+4545
• Broadband X-ray characteristics of the transient pulsar GRO J2058+42
• Confirmation of IGR J01363+6610 as a Be X-ray binary with very low quiescent X-ray luminosity
• The Galactic high mass X-ray binary population with Fermi -LAT
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• Long-term optical variability of the Be/X-ray binary GRO J2058+42
• Kinematic distinction of the two subpopulations of X-ray pulsars