Long-term X-ray Variability Study of IC342 from XMM-Newton Observations

Details Long-term X-ray Variability Study of IC342 from XMM-Newton Observations Long-term X-ray Variability Study of IC342 from XMM-Newton Observations

2010-11-28

arxiv.org/abs/1011.6015v1

Daisy S. Y. Mak et al. 2011 ApJ 728 10

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

45 pages, 6 figures accepted by ApJ

Scientific paper

10.1088/0004-637X/728/1/10

We presented the results of an analysis of four XMM-Newton observations of the starburst galaxy IC342 taken over a four-year span from 2001 to 2005, with an emphasis on investigating the long-term flux and spectral variability of the X-ray point sources. We detected a total of 61 X-ray sources within 35' $\times$ 30' of the galaxy down to a luminosity of (1-2)$\times$1037 erg s-1 depending on the local background. We found that 39 of the 61 detected sources showed long-term variability, in which 26 of them were classified as X-ray transients. We also found 19 sources exhibiting variations in hardness ratios or undergoing spectral transitions among observations, and were identified as spectral variables. In particular, 8 of the identified X-ray transients showed spectral variability in addition to flux variability. The diverse patterns of variability observed is indicative of a population of X-ray binaries. We used X-ray colors, flux and spectral variability, and in some cases the optical or radio counterparts to classify the detected X-ray sources into several stellar populations. We identified a total of 11 foreground stars, 1 supersoft sources (SSS), 3 quasisoft sources (QSS), and 2 supernova remnants (SNR). The identified SSS/QSS are located near or on the spiral arms, associate with young stellar populations; the 2 SNR are very close to the starburst nucleus where current star formation activities are dominated. We also discovered a spectral change in the nuclear source of IC342 for the first time by a series of X-ray spectrum analysis.

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