The evolution of X-ray-selected narrow-emission-line galaxies

Details The evolution of X-ray-selected narrow-emission-line galaxies The evolution of X-ray-selected narrow-emission-line galaxies

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289..693p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 3, pp. 693-699.

Astronomy and Astrophysics

Astronomy

4

Surveys, Galaxies: Active, Galaxies: Evolution, Quasars: General, Cosmology: Observations, X-Rays: Galaxies

Scientific paper

We examine the cosmological evolution of X-ray-selected narrow-emission-line galaxies (NELGs), using a sample of 35 such objects identified in the combined ROSAT UK Deep Survey and RIXOS. This sample is entirely independent of those previously used to investigate the X-ray evolution of NELGs. We detect evolution which is at a similar rate to the evolution found in the optical luminosity function of blue galaxies. The lack of high-redshift (z>0.6) NELGs detected in X-ray surveys, and the small, well-defined number of X-ray sources which are not optically identified indicate that the evolution of NELGs is probably not the same as the X-ray evolution of QSOs: NELG evolution is slower than the evolution of QSOs and/or ends at a lower redshift.

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