The First Two Transient Supersoft X-Ray Sources In M 31 Globular Clusters And The Connection To Classical Novae

dc.contributor.utaustinauthorQuimby, R.en_US
dc.creatorHenze, M.en_US
dc.creatorPietsch, W.en_US
dc.creatorHaberl, F.en_US
dc.creatorSala, G.en_US
dc.creatorQuimby, R.en_US
dc.creatorHernanz, M.en_US
dc.creatorDella Valle, M.en_US
dc.creatorMilne, P.en_US
dc.creatorWilliams, G. G.en_US
dc.creatorBurwitz, V.en_US
dc.creatorGreiner, J.en_US
dc.creatorStiele, H.en_US
dc.creatorHartmann, D. H.en_US
dc.creatorKong, A. K. H.en_US
dc.creatorHornoch, K.en_US
dc.description.abstractContext. Classical novae (CNe) have been found to represent the major class of supersoft X-ray sources (SSSs) in our neighbour galaxy M 31. Aims. We determine the properties and evolution of the two first SSSs ever discovered in the M 31 globular cluster (GC) system. Methods. We have used XMM-Newton, Chandra and Swift observations of the centre region of M 31 to discover both SSSs and to determine their X-ray light curves and spectra. We performed detailed analysis of XMM-Newton EPIC PN spectra of the source in Bol 111 (SS1) using blackbody and NLTE white dwarf (WD) atmosphere models. For the SSS in Bol 194 (SS2) we used optical monitoring data to search for an optical counterpart. Results. Both GC X-ray sources were classified as SSS. We identify SS1 with the CN M31N 2007-06b recently discovered in the M 31 GC Bol 111. For SS2 we did not find evidence for a recent nova outburst and can only provide useful constraints on the time of the outburst of a hypothetical nova. Conclusions. The only known CN in a M 31 GC can be identified with the first SSS found in a M 31 GC. We discuss the impact of our observations on the nova rate for the M 31 GC system.en_US
dc.description.sponsorshipBundesministerium fur Wirtschaft und Technologie / Deutsches Zentrum fur Luft- und Raumfahrt BMWI/DLR FKZ 50 OX 0001en_US
dc.description.sponsorshipU.S. Government NAG W-2166en_US
dc.description.sponsorshipBMWI/DLR FKZ 50 OR 0405, AYA2008-04211-C02-01, AYA2007-66256en_US
dc.identifier.citationHenze, Martin, W. Pietsch, F. Haberl, G. Sala, R. Quimby, M. Hernanz, M. Della Valle et al. >The first two transient supersoft X-ray sources in M 31 globular clusters and the connection to classical novae.> Astronomy & Astrophysics, Vol. 500, No. 2 (Jun., 2009): pp. 769-779.en_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectgalaxies: individual: m 31en_US
dc.subjectnovae, cataclysmic variablesen_US
dc.subjectindividual: nova m31n 2007-06ben_US
dc.subjectglobular clusters: individual: bol 111en_US
dc.subjectglobular clusters: individual bol 194en_US
dc.subjectx-rays: galaxiesen_US
dc.subjectnlte model atmospheresen_US
dc.subjectoptical novaeen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe First Two Transient Supersoft X-Ray Sources In M 31 Globular Clusters And The Connection To Classical Novaeen_US

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