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Faint galaxies and the X-ray background
O. Almaini, T. Shanks, B. J. Boyle +5
We summarise our recent work on the faint galaxy contribution to the cosmic X-ray background (XRB). At bright X-ray fluxes (in the ROSAT pass band), broad line QSOs dominate the X-…
AXJ1749+684: a narrow emission-line galaxy with a flat X-ray spectrum
K. Iwasawa, A. C. Fabian, W. N. Brandt +2
We report the serendipitous detection of an X-ray source, AXJ1749+684, with the ASCA Gas Imaging Spectrometer. AXJ1749+684 is identified with a LINER/starburst-type spiral galaxy K…
Using STIS to find Gamma-Ray Burst Redshifts
Joshua S. Bloom, Steinn Sigurdsson, Ralph A. M. J. Wijers +3
A recent spectrum of the optical afterglow of GRB 970508 suggests that gamma-ray bursts (GRBs) are cosmological in origin and it is of crucial importance to derive an accurate dist…
ASCA observations of deep ROSAT fields I. the nature of the X-ray source populations
I. Georgantopoulos, G. C. Stewart, A. J. Blair +5
We present ASCA GIS observations (total exposure 100-200 ksec) of three fields which form part of our deep ROSAT survey. We detect 26 sources down to a limiting flux (2-10 keV) of…
AGN predictions for the Hubble Deep Field and the X-ray background
O. Almaini, A. C. Fabian
We estimate the number of AGN among the galaxies in the Hubble Deep Field (HDF). The recent discovery of a class of X-ray luminous narrow emission-line galaxies has provided a poss…
A deep ROSAT Survey - XIV. X-ray emission from faint galaxies
O. Almaini, T. Shanks, R. E. Griffiths +4
We present a cross-correlation analysis to constrain the faint galaxy contribution to the cosmic X-ray background (XRB). Cross-correlating faint optical galaxy catalogues with unid…