Max-Planck-Institut für extraterrestrische Physik

Röntgenüberwachung Optischer Novae

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Novae in Galaxien
SSS in M31

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Why observe Novae in M 31?

In contrast to our Galaxy, observing novae in the nearby galaxy M 31 offers the unique chance to learn more about the duration of the supersoft X-ray state in novae with minimal effort:
  • M 31 is the only nearby galaxy with many (more than 100 novae that exploded over the last 5 years!) reported optical novae within the FOV of one XMM-Newton or Chandra observation
  • All novae are at the same, known distance, thus allowing easy comparison of light curves and maximum brightness/luminosity in the optical and X-ray regime
  • Low Galactic foreground as well as intrinsic M 31 absorption allows accurate determination of color and temperature
  • Comparatively little observing time allows us to obtain a homogeneous nova sample and to follow the X-ray evolution of all of them over time
  • The derived durations of nova supersoft source states will allow us to constrain envelope and white dwarf masses, and potentially to correlate differences in metallicity with location in M 31 (bulge versus disk population)
  • X-ray parameters will be correlated with nova type (Fe II, He/N) and speed class
  • Recurrent novae will be discovered through the detection of a delayed supersoft source phase. This may establish them as believable progenitors of SNe-Ia.
The validity of these arguments has been proven using archival ROSAT, XMM-Newton and Chandra observations. However, the sampling of the observations in the archive where not optimized for optical nova monitoring. Therefore we initiated a dedicated XMM-Newton/Chandra program and were granted time in XMM-Newton AO5 to AO9.

XMM-Newton/Chandra AO5 program

XMM-Newton/Chandra AO6 program

XMM-Newton/Chandra AO7 program

XMM-Newton/Chandra AO8 program

XMM-Newton/Chandra AO9 program

XMM-Newton/Chandra AO10 program

Some of the novae also were followed up with SWIFT observations.

Swift observations

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letzte Änderung:19-12-2006, Editor dieser Seite:Wolfgang Pietsch, Frank Haberl

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