... The peak in the differential number counts corresponds to a population of faint sources that is not expected from predictions based on 15 ЮМm counts from the Infrared Space Observatory. ... This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. ... ADS Citation Query . citations = 284 . citations vs. year [year,citations] . ...

... QSO spectra in the ROSAT band are steeper than the background at harder energies, and furthermore at fluxes below 1E-14 ergs/(s cmќ) the quasar source counts flatten off and are replaced by more numerous populations of relatively low red-shift objects, apparently Narrow Emission Line Galaxies (NELG). ... We extracted the luminosity function from ROSAT Deep Survey results, and extrapolated by a factor of 2 - 3 to account for changes expected in the harder XMM band. ...

Next: The Model Up: No Title Previous: Radiopulsars as Sources of . In this section, we study the evolution of stellar populations on a time-scale of 10 Myr for a starburst љ occurring under conditions similar to those in the Galactic Center (see Lipunov et al. (1995d)[ 126 ]). We estimate the expected number of X-ray transient љ sources (NS + MS star), super accreting BH, and BH + supergiant binaries, all as functions of time elapsed after the burst. ...

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From a survey for the redshifted H I 21-cm and OH 18-cm absorption in the hosts of a sample of radio galaxies and quasars, we detect H I in three of the 10 and OH in none of the 14 sources for which useful data were obtained. ... The importance of the UV luminosity (over AGN type) in the detection of the 21-cm absorption is further supported by the non- detections in the two high-redshift (z 3.6-3.8) radio galaxies, which are both type 2 objects, while having L UV > 10 23 W/Hz. ...