Bibcode
Kong, Albert; Garcia, M. R.; Primini, F. A.; McClintock, J. E.; Murray, S. S.; di Stefano, R.
Bibliographical reference
X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held 14-15 November, 2002 at MIT Draper Labs Extension, Cambridge, MA. Hosted by Chandra X-ray Center, 2002, meeting abstract.
Advertised on:
11
2002
Citations
0
Refereed citations
0
Description
M31 has been monitored by the HRC and ACIS detectors aboard Chandra from
1999 to 2002. We report here a summary of properties of X-ray sources in
M31 with a focus on an ongoing Chandra/HST program to monitor X-ray
transients in M31. By comparing individual X-ray images, more than 100
sources were found to be variable (half the total number observed) on a
time scale of months. Combining our sample with all of the available
transients found in the literature, there are ~30 transients in M31 and
M32 detected by Chandra and XMM. We also perform follow-up observations
with HST to search for the UV counterparts of transient sources. While
no definitive UV counterparts have been found so far, the X-ray
brightest of these transients has the strongest candidate counterpart.
The discovery of repeated outbursts from three of the transients yields
new direct information on duty cycles of transients in M31.