NGC253 is a local, star-bursting spiral galaxy with strong X-ray emission from hot gas, as well as many point sources. We have conducted a spectral survey of the Xray population of NGC253 using a deep XMM-Newton observation. NGC 253 only accounts for ∼20% of the XMM-Newton EPIC field of view, allowing us to identify ∼100 X-ray sources that are unlikely to be associated with NGC253. Hence we wer...

We present an analysis of 15 Chandra observations of the nearby spiral galaxy M81 taken over the course of six weeks in 2005 May–July. Each observation reaches a sensitivity of ∼1037 erg s−1. With these observations and one previous deeper Chandra observation, we compile a master source list of 265 point sources, extract and fit their spectra, and differentiate basic populations of sources thro...

Using results of Chandra observations of old stellar systems in eleven nearby galaxies of various morphological types and census of LMXBs in the Milky Way we study population of low mass X-ray binaries and their relation to the mass of the host galaxy. We show that azimuthally averaged spatial distribution of the number of LMXBs and, in the majority of cases, of their collective luminosity clos...

Abstract The Hawaii Survey Field SSA22 is the fourth deepest Chandra X-ray field. To allow for fullest exploration of this field, we present new optical spectroscopy from Keck/DEIMOS and Keck/LRIS, which, in combination with literature, brings spectroscopic completeness 2–8 keV sample to 62%. We also make spectral classifications estimate photometric redshifts sources without redshifts. then de...