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GRO J2058+42 Observations with Chandra and Detection of a Likely Optical CounterpartGRO 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-arcminute 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 follow-up optical observations of the brightest object, that had about 64 X-ray counts and was just 0.3 arcmin 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 system. Although X-ray pulsations were undetectable due to the low count rate, this object is most likely the optical counterpart to GRO J2058+42. We present results from the Chandra observation and from the optical observations.
Document ID
Document Type
Conference Paper
Wilson, Colleen A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Coe, M. J.
(Southampton Univ. United Kingdom)
Finger, M. H.
(National Space Science and Technology Center Huntsville, AL, United States)
Weisskopf, M. C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Greiner, J. C.
(Max-Planck-Inst. fuer Extraterrestrische Physik Germany)
Reig, P.
(Crete Univ. Greece)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Meeting Information
Meeting of the High Energy Astrophysical Division of the American Astronomical Society(New Orleans, LA)
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