Nova 2005-09c in M31
ATel #1390; Marina Orio (INAF-Padova, and University of Wisconsin) and Thomas Nelson (University of Wisconsin)
on 18 Feb 2008; 16:58 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Marina Orio (orio@astro.wisc.edu)
Marina Orio and Thomas Nelson report that the M31 nova 2005-09 c (Quimby et al. 2005, ATel 600,
and Hatzidimitriou et al., A&A 464, 1075) is detected as a luminous supersoft X-ray source (SSS) in
an archival XMM exposure taken 10 months after the optical maximum of this nova, on 2006-06-28,
with a count rate 0.0100$\pm$0.0018 cts/s in the 0.15-1 keV range. Despite the poor signal to noise, no significant counts above the background are measured above 0.8 keV and the spectrum is consistent with a blackbody with luminosity 2.5-3 $\times 10^{37$ erg/s, blackbody temperature T~60 eV and column density N(H)>=1.3 10$^{21}$ cm$^{-2}$. M31 N 2005-09 was a Fe nova, and this is the first time the SSS behaviour of a classical nova in M31 can be correlated with its spectroscopic and
photometric properties in the optical range.
