Xmm-newton epic view of the starburst galaxy ngc 253

Дата канвертавання24.04.2016
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XMM-Newton EPIC view of the starburst galaxy NGC 253
Wolfgang Pietsch

Max Planck Institut für extraterrestrische Physik, Garching

The nearby prototypical starburst galaxy NGC 253 was observed with the XMM-Newton EPIC cameras during the CAL/PV, GT and AO2 phase. Combining data from different epochs we not only detected several bright X-ray transients within the disk of the galaxy but also the first eclipsing X-ray binary outside the Local Group of galaxies. This X-ray source (RX J004717.4-251811) was found to undergo changes from a low to a high state twice, during the GT XMM-Newton observation in December 2000 and also during a Chandra observation one year earlier. We interprete these transitions as egresses from eclipses of a compact object in a high mass X-ray binary system. Possible periods are constrained to p = 352.870 d / n where n is the number of periods between the two eclipse egresses. With the help of additional data from the source from the XMM-Newton, Chandra, ROSAT and Einstein archives we further constrain possible orbital periods leaving seven acceptable ones with 1.47 d and 3.21 d the most promissing. Further properties of this interesting X-ray binary are presented in Pietsch, Haberl and Vogler 2003, A&A 402, 457.

In addition we discuss images and spectra from the superluminous source close to the NGC 253 nucleus (ROSAT source X33) and from the extended emission from hot gas in the nuclear area, plume, disk and halo for the galaxy.

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