Chandra LETGS and XMM-Newton observations of NGC 4593

Chandra and XMM - Newton observations of NGC 6251

We present new X-ray observations of the nucleus, jet and extended emission of the nearby radio galaxy NGC 6251 using the Chandra/ACIS-S camera, together with a reanal-ysis of archival Chandra/ACIS-I and XMM-Newton/EPIC data. We find that the nuclear X-ray spectrum is well-fitted with an absorbed power-law, and that there is tentative, but not highly significant, evidence for Fe Kα emission. We...

XMM-Newton and Chandra observations of SHEEP sources

We presentChandra and XMM-Newton observations of 12 bright (f(2−10keV) > 10 erg cm s) sources from the ASCA SHEEP (Search for the High Energy Extragalactic Population) survey. Most of these have been either not observed or not detected previously with the ROSAT mission and therefore they constitute a sample biased towards hard sources. The Chandra observations are important in locating with acc...

X-Ray Observations of Neutron Stars with XMM-Newton & Chandra

Coronal activity with XMM-Newton and Chandra

XMM-Newton and Chandra have greatly deepened our knowledge of stellar coronae giving access to a variety of new diagnostics such that nowadays a review of stellar X-ray astronomy necessarily must focus on a few selected topics. Attempting to provide a limited but representative overview of recent discoveries I discuss three subjects: the solar-stellar connection, the nature of coronae in limiti...

XMM - Newton observations of the merger - remnant galaxies NGC 3921 and NGC 7252

Using the high sensitivity of XMM-Newton, we have studied the X-ray emission of the two proto-typical late-stage merger remnants, NGC 3921 and NGC 7252. In the case of NGC 7252, this is complemented by archival Chandra data. We investigate the nature of the discrete X-ray point source populations and the hot diffuse gas components in these two galaxies, and compare them in the light of their di...