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Classical Novae as Supersoft X-ray Sources in the Andromeda Galaxy

Published online by Cambridge University Press:  17 January 2013

Martin Henze ,
Wolfgang Pietsch ,
Frank Haberl ,
Margarita Hernanz ,
Gloria Sala ,
Massimo Della Valle ,
Despina Hatzidimitriou ,
Arne Rau ,
Dieter H. Hartmann  and
Vadim Burwitz
...Show all authors
Martin Henze
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
Wolfgang Pietsch
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
Frank Haberl
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
Margarita Hernanz
Affiliation:
Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Fac. Ciències, E-08193 Bellaterra, Spain
Gloria Sala
Affiliation:
Departament de Física i Enginyeria Nuclear, EUETIB (UPC-IEEC), Comte d'Urgell 187, E-08036 Barcelona, Spain
Massimo Della Valle
Affiliation:
INAF-Napoli, Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, I-80131 Napoli, Italy International Centre for Relativistic Astrophysics, Piazzale della Repubblica 2, I-65122 Pescara, Italy
Despina Hatzidimitriou
Affiliation:
Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, University of Athens, Panepistimiopolis, GR15784 Zografos, Athens, Greece Foundation for Research and Technology Hellas, IESL, Greece
Arne Rau
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
Dieter H. Hartmann
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978, USA
Vadim Burwitz
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
Jochen Greiner
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany email: mhenze@mpe.mpg.de
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Abstract

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We review the first results of a dedicated, on-going monitoring project for supersoft X-ray source (SSS) states of classical novae (CNe) in the central region of the Andromeda galaxy (M 31). So far, during three high-cadence observation campaigns with the X-ray telescopes XMM-Newton and Chandra from 2006 until 2009 we detected 21 CNe, only four of which were seen in X-rays before. This increased the total number of known CNe with X-ray counterparts in M 31 to 60, which is significantly larger than for any other galaxy, including the Milky Way. We compiled a catalog of X-ray and optical properties for these 60 sources which allowed us to perform source statistics and population studies of CNe with SSS state in M 31 for the first time. Here we review the results of this analysis: (i) several correlations between X-ray and optical parameters, (ii) an analysis of the intrinsic fraction of CNe with SSS state, and (iii) the first nova population study in X-rays. Our first results are promising, however a continuing monitoring of the unique target M 31 is strongly needed to extend this valuable data base and to refine the early statements and predictions.

Keywords

galaxies: individual (M 31) — novaecataclysmic variables — X-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Issue S281: Binary Paths to Type Ia Supernovae Explosions , July 2011 , pp. 105 - 112
Copyright
Copyright © International Astronomical Union 2013

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