Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..963t&link_type=abstract
Astronomical Journal v.110, p.963
Astronomy and Astrophysics
Astronomy
65
Galaxies: Formation, Galaxies: Stellar Content, Galaxies: Starburst
Scientific paper
We present the results of a narrowband imaging survey for Lyα emission from young and forming ellipticals or spheroids at high redshifts. A total of 11 independent datacubes, each consisting of 6-11 images at slightly different central wavelengths, were obtained using a Fabry-Perot imaging interferometer on fields of ~5 arcmin square. Each datacube spans {DELTA}z~0.2 while the total survey spans a redshift range of 2.78-4.89 for Lyα line emission. We reach a 1 σ limiting line flux (in an aperture of twice the seeing FWHM) of ~1.5 X 10^-17^ ergs cm^-2^ s^-1^ over 0.05 deg^2^, with a total of 0.63 deg^2^ surveyed to a limiting line flux of ~8.5 X 10^-17^ ergs cm^-2^ s^-1^. The survey reaches a 1σ average limiting restframe Lyα emission line luminosity of ~1.5 x 10^42^ ergs s^-1^ over a volume of 3000 comoving Mpc^3^, with a total volume of 110000 comoving Mpc^3^ surveyed to an emission line luminosity of ~2.0 x 10^43^ ergs s^-1^ (for H_0_= 75 km s^- 1^ Mpc^-1^ and {OMEGA}_0_ = 0.2). No obvious population of Lyα luminous primeval galaxies has been detected so far, although a number of candidates remain which need to be checked by follow-up spectroscopy. Possible explanations for the lack of detection of a population of primeval galaxies at optical wavelengths in this and similar surveys include the possibility that they were obscured by dust or that the bulk of galaxy formation occurred at redshifts z_gf_ >= 5. The instrument used for this survey is also briefly described.
Djorgovski Stanislav
Thompson Dana
Trauger John
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