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An X-ray Transient and Optical Counterpart in the M31 Bulge | | Benjamin F. Williams
; Michael R. Garcia
; Jeffrey E. McClintock
; Albert K. H. Kong
; Frank A. Primini
; Stephen S. Murray
; | | Date: |
11 Apr 2005 | | Journal: | Astrophys.J. 628 (2005) 382-387 | | Subject: | astro-ph | | Abstract: | We have obtained snapshot images of a transient X-ray source in M31 from Chandra ACIS-I and the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). The Chandra position of the X-ray nova was R.A.=00:42:56.038 +/-0.08’’, Dec.=+41:12:18.50 +/-0.07’’. The transient was active for at least 6 months. Previous observations set an upper limit before the X-ray outburst, demonstrating variability by a factor of >100 and confirming the transient nature of the source. For the first 6 months after the initial detection, the X-ray luminosity was ~6 X 10$^{37}$ erg/s; it then decayed to <5 X 10$^{36}$ erg/s over the following 2 months. An HST observation 29 days after the initial X-ray detection revealed a source at R.A.=00:42:56.042, Dec.=+41:12:18.45 that was B=24.52 +/- 0.07. This optical source faded to B=24.95 +/- 0.08$ in 9 months. The HST identification of an optical source at the same position as the X-ray source, fading in concert with the X-ray source, indicates that this optical source is the counterpart of the X-ray transient. The lack of high-mass stars in the region suggests this source is a low-mass X-ray binary, and the X-ray and optical luminosities provide a rough orbital period estimate of 8$^{+12}_{-5}$ days for the system. | | Source: | arXiv, astro-ph/0504255 | | Services: | Forum | Review | PDF | Favorites | |
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