Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...23t&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 23-24 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
Active Galaxies, Astronomical Spectroscopy, B Stars, Fabry-Perot Interferometers, Radio Astronomy, Radio Galaxies, Red Shift, Star Formation Rate, Imaging Techniques, Narrowband
Scientific paper
A number of active galaxies are now known at very large redshifts, some of them even have properties suggestive of galaxies in the process of formation. They commonly show strong Ly-alpha emission, at least some of which appears to be ionized by young stars. Inferred star formation rates are in the range approximately = 100-500 solar mass/yr. An important question is: are there radio-quiet, field counterparts of these systems at comparable redshifts? Whereas, we are probably already observing some evolutionary and formative processes of distant radio galaxies, the ultimate goal is to observe normal galaxies at the epoch when most of their stars form. We have, thus, started a search for emission-line objects at large redshifts, ostensibly young and forming galaxies. Our method is to search for strong line emission (hopefully Ly alpha) employing two techniques: a direct, narrow-band imaging search, using a Fabry-Perot interferometer; and a serendipitous long-slit spectroscopic search.
Djorgovski Stanislav
Thompson Dana
Trauger John
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