Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7906d&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #79.06; Bulletin of the American Astronomical Society, Vol. 24, p.1248
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on the status and results to date from a set of experiments now in progress at Palomar and CTIO, with the goal of detecting young and forming normal galaxies at large redshifts. We are conducting two unbiased field surveys for Lyalpha galaxies: a narrow-band imaging survey using a Fabry-Perot interferometer, and a serendipitous long slit search. Several candidates for Lyalpha galaxies at z > 4 have been identified, but not yet decisively checked spectroscopically. In addition, numerous faint emission line galaxies (typical continuum magnitudes r ~ 21 - 25) at z ~ 0 - 1 have been found; they will provide a data base to study evolution of field galaxies at moderate redshifts. Even if none of the candidate Lyalpha galaxies are confirmed as such, our limits are already in conflict with the simple CDM-based theoretical predictions. These negative results may be explained if either protogalaxies were obscured by dust, and/or formation of most ellipticals and massive bulges culminates at z > 5. We are also conducting a targeted search for quasar-marked protoclusters at z > 4, using two methods: broad-band multicolor imaging to identify fainter quasars or AGN, and narrow-band imaging to identify possible star-formation-powered Lyalpha galaxies. Again, several candidate objects have been identified, including a possible galaxy at z = 4.4, but still remain to be decisively checked spectroscopically. If the weather cooperates, we may have some more definitive cases by the time of the meeting.
Djorgovski Stanislav
Smith Douglas J.
Thompson Daniel J.
Trauger John
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