منابع مشابه
A Possible Detection of M31* with Chandra
Two independent sets of Chandra and HST images of the nuclear region of M31 allow registration of X-ray and optical images to ∼ 0.1. This registration shows that none of the bright (∼ 10erg s) X-ray sources near the nucleus is coincident with the central super-massive black hole, M31*. A 50ks Chandra HRC image shows 2.5σ evidence for a faint (3×10erg s), apparently resolved source which is cons...
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We present results from an analysis of two Chandra observations of the rich, nearby galaxy cluster Abell 2199. We find evidence (having corrected for projection effects) for radial gradients in temperature and metallicity in the X-ray emitting gas: the temperature drops from kT ∼ 4.2 keV at R=200 kpc to 1.6 keV within R=5 kpc of the centre. The metallicity rises from ∼ 0.3 solar at R=200 kpc to...
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The Sloan Digital Sky Survey (SDSS) quasars at redshift z ≈ 6 (Fan et al. 2001) are the most distant condensed objects known in the universe. X-ray observations of them are of great importance; e.g., to study the cosmic time evolution of X-ray emission and to assess the detectability of quasar X-ray emission at even larger redshifts. All three quasars were easily detected in X-rays even in thes...
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We present results of a study of 12 dust-reddened quasars with 0.4 < z < 2.65 and reddenings in the range 0.15 < E(B − V ) < 1.7. We obtained ACIS-S X-ray spectra of these quasars, estimated the column densities towards them, and hence obtained the gas:dust ratios in the material obscuring the quasar. We detect all but one of the red quasars in the X-rays. Even though there is no obvious correl...
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We present a brief review of Chandra observations of neutron stars, with a concentration on neutron stars in supernova remnants. The early Chandra results clearly demonstrate how critical the angular resolution has been in order to separate the neutron star emission from the surrounding nebulosity.
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2001
ISSN: 0074-1809
DOI: 10.1017/s0074180900220366