New X-ray Transients in M31: XMMU J004215.8+411924 and SWIFT J004217.4+411532

Astronomy and Astrophysics – Astronomy

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X-Ray, Binaries, Black Holes, Neutron Stars, Transients

Scientific paper

A 20 ksec XMM-Newton observation on 2006, August 9 as part of the monitoring program of the X-ray supersoft state of optical novae in the core of M31 (see http://www.mpe.mpg.de/xray/research/normal_galaxies/m31/novae.php ) revealed a new bright transient at R.A.(J2000) = 00:42:15.88, Dec. (J2000) = +41:19:24.4 with a position uncertainty of ~2 arcseconds. The source designated XMMU J004215.8+411924 shows a hard X-ray spectrum with an absorption column density of 4.2x10^21 cm^-2 and a photon index of 1.57 when modeled with an absorbed power-law.

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