XMMU J004243.6+412519 becomes the second ultraluminous X-ray source in M 31

Details XMMU J004243.6+412519 becomes the second ultraluminous X-ray source in M 31 XMMU J004243.6+412519 becomes the second ultraluminous X-ray source in M 31

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012atel.3921....1h&link_type=abstract

The Astronomer's Telegram, #3921

Astronomy and Astrophysics

Astronomy

X-Ray, Transient

Scientific paper

We report a significant brightening of the new X-ray transient XMMU J004243.6+412519 (discovery reported by us in ATel #3890) which makes this object the second ultraluminous X-ray source (ULX) to be detected in M 31. The source had crossed the ULX threshold (L > 1e39 erg/s) first in a 17.3 ks XMM-Newton observation which started on 2012-01-21.51 UT (about six days after discovery) and was still detected at a similar brightness ten days later in a 26.0 ks XMM-Newton observation which started on 2012-01-31.10 UT.

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