XMM-Newton Observations of NGC 253: Resolving the Soft and Hard X-ray Emission

Details XMM-Newton Observations of NGC 253: Resolving the Soft and Hard X-ray Emission XMM-Newton Observations of NGC 253: Resolving the Soft and Hard X-ray Emission

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.9204p&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #92.04; Bulletin of the American Astronomical Society, Vol. 32, p.1566

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first XMM-Newton observation of the nearby starburst galaxy NGC 253. The high throughput and ~ 10" resolution of XMM-Newton resulted in high signal-to-noise spectra, images, and light curves of the disk, halo and point-source features known from previous X-ray studies and a high resolution reflection grating spectrum of the nuclear region. The grating spectrum suggests temperatures ranging from 0.3-1.7 x 107K and an electron density on the order of 0.1 cm-3. CCD images reveal that the limb-brightening of the plume (reported previously by Chandra) is mostly seen in high ionization emission lines, while in the lower ionization lines and below 0.5 keV the plume is more homogeneous. We detect the 6.7 keV emission line first discovered with BeppoSAX. A new, transient source detected 70" SSW of the nucleus exhibits the hardest spectrum of the point sources in NGC 253. The brightest (LX ~ 1039 \ ergs \ s-1) X-ray source, 30" S of the nucleus, is variable by a factor of 2 within the XMM-Newton observation and has a spectrum consistent with a column density of ~ 3 x 1021 cm-2 and a thermal model with T ~ 6 x 107K or a power-law model with an energy index of ~ 1, suggesting that this source is a black hole X-ray binary. The implications of these results for models of starburst galaxies will be discussed.

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