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J/A+A/448/1247 XMM-Newton survey of M33 (Misanovic+, 2006)
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Beginning of ReadMe :J/A+A/448/1247 XMM-Newton survey of M33 (Misanovic+, 2006)
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XMM-Newton survey of the Local Group galaxy M33.
Variability of the detected sources.
Misanovic Z., Pietsch W., Haberl F., Ehle M., Hatzidimitriou D.,
Trinchieri G
<Astron. Astrophys. 448, 1247 (2006)>
=2006A&A...448.1247M
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ADC_Keywords: Galaxies, nearby ; X-ray sources
Keywords: Galaxies: individual: M33 - X-rays: galaxies ; X-rays: binaries
Abstract:
We present an analysis of the individual observations of a deep
XMM-Newton survey of the Local Group spiral galaxy M33. We detected
a total of 350 sources with fluxes (in the 0.2-4.5keV energy band)
in the range 6.7x10^-16^-1.5x10^-11^erg/s. This comprehensive study
considers flux variability, spectral characteristics, and
classification of the detected objects. Thirty-nine objects in our
catalogue are new sources, while 311 were already detected in a
previous analysis of most of the same data using combined images. We
present improved positions of these sources and the X-ray parameters
of each source in each individual observation that covers the source.
We then used these parameters to systematically search for flux
variability on time scales of hours to months or years. The long-term
light-curves were generated for the 61 sources showing a significant
variability of the (0.2-4.5)keV flux, by a factor of 1.2 to 144. The
detected variability was then used to classify 8 new X-ray binary
candidates in M33. Together with the hardness ratio method and
cross-correlation with optical, infrared, and radio data, we also
classify or confirm previous classification of 25 supernova remnants
and candidates, 2 X-ray binaries, and 11 super-soft source candidates
(7 of which are new SSS candidates).
In addition, we classify 13 active galactic nuclei and background
galaxies, 6 stars, and 23 foreground star candidates in the direction
of M33. Further 206 objects are classified as 'hard', approximately
half of which are sources intrinsic to M33. The relative contribution
of the classified XRB and SSS in M33 is now comparable to M31. The
luminosity distribution of SNRs in both spiral galaxies is almost the
same, although the number of the detected SNRs in M33 remains much
higher.
Description:
We present analysis of all 24 archival raster XMM-Newton (Jansen et
al., 2001A&A...365L...1J) observations of M33.