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XMM-Newton survey of the Local Group galaxy M 33 catalogue results and global properties

Citation:

Misanovic Z, Pietsch W, Haberl F, Ehle M, Hatzidimitriou D, Trinchieri G. XMM-Newton survey of the Local Group galaxy M 33 catalogue results and global properties. In: Vol. 230. ; 2006. pp. 160 - 161.

Date Presented:

2006/01/1

Abstract:

Using 24 overlapping XMM-Newton observations of the Local Group spiral galaxy M 33, we have detected 447 sources in each individual pointing and in deep combined images. A total of 61 sources exhibit significant flux variations by a factor of up to 144, on time scales of hours to months or years. The detected variability, together with the hardness ratio (HR) method and optical identification (when available), is used to classify the sources as X-ray binaries (XRBs), supernova remnants (SNRs) and super-soft sources (SSS) in M 33, as well as background AGN and foreground stars in the field of view. The majority of sources can only be classified as ‘hard’, according to their HRs. We find that the luminosity distribution of the detected SNRs and SNR candidates in M 33 is similar to M 31, and slightly steeper than that of the LMC.

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