Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-13
Astronomy and Astrophysics
Astrophysics
Invited talk given at the IAU 8th Asian-Pacific Regional Meeting in Tokyo, July 2002. To appear in the Proceedings (eds: S. Ik
Scientific paper
Radio continuum surveys can detect galaxies over a very wide range in redshift, making them powerful tools for studying the distant universe. Until recently, though, identifying the optical counterparts of faint radio sources and measuring their redshifts was a slow and laborious process which could only be carried out for relatively small samples of galaxies. Combining data from all-sky radio continuum surveys with optical spectra from the new large-area redshift surveys now makes it possible to measure redshifts for tens of thousands of radio-emitting galaxies, as well as determining unambiguously whether the radio emission in each galaxy arises mainly from an active nucleus (AGN) or from processes related to star formation. Here we present some results from a recent study of radio-source populations in the 2dF Galaxy Redshift Survey, including a new derivation of the local star-formation density, and discuss the prospects for future studies of galaxy evolution using both radio and optical data.
Cannon Russell D.
Jackson Carole A.
Sadler Elaine M.
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