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26 April 2024 |
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Discovery of a Be/X-ray Binary Consistent with the Position of GRO J2058+42 | | Colleen A. Wilson
; Martin C. Weisskopf
; Mark H. Finger
; M.J. Coe
; Jochen Greiner
; Pablo Reig
; Giannis Papamastorakis
; | | Date: |
20 Dec 2004 | | Journal: | Astrophys.J. 622 (2005) 1024-1032 | | Subject: | astro-ph | | Affiliation: | NSSTC), M.J. Coe (Southampton, UK), Jochen Greiner (MPE-Garching), Pablo Reig, Giannis Papamastorakis (Univ of Crete/IESL | | 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. | | Source: | arXiv, astro-ph/0412527 | | Services: | Forum | Review | PDF | Favorites | |
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