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Redshift z ~ 1 Field Galaxies Observed with the Keck Telescope and the HST | | David C. Koo
; Nicole P. Vogt
; Andrew C. Phillips
; Rafael Guzman
; K. L. Wu
; S. M. Faber
; Caryl Gronwall
; Duncan A. Forbes
; Garth D. Illingworth
; Edward J. Groth
; Marc Davis
; Richard G. Kron
; Alexander S. Szalay
; | | Date: |
19 Apr 1996 | | Journal: | Astrophys.J. 469 (1996) 535 | | Subject: | astro-ph | | Affiliation: | Princeton), Marc Davis (UC Berkeley), Richard G. Kron (Fermilab), Alexander S. Szalay (JHU) ( UCO/Lick Observatory | | Abstract: | We report results based on 35 new spectroscopic redshifts obtained with the Keck Telescope for field galaxies that also have photometry and morphology from survey images taken by the refurbished HST. A sample of 24 redshifts for galaxies fainter than I = 22 has a median redshift of z ~ 0.81. This result is inconsistent with the lower median redshift of z ~ 0.6 predicted by the ``maximal merger models’’ of Carlberg (1996), which otherwise fit existing data. The data match an extrapolation of the CFRS, as well as predictions of certain mild luminosity-evolution models. Nearly half of the redshifts lie in two structures at z ~ 0.81 and z ~ 1.0, showing the presence of high density concentrations spanning scales of ~ 1/h Mpc, i.e., the size of groups. We find emission lines or the presence of possible neighbors in 7 of 9 otherwise luminous galaxies with red central regions at redshifts beyond z ~ 0.7. We also note a diversity of morphological types among blue galaxies at z ~ 1, including small compact galaxies, ``chains,’’ and ``blue nucleated galaxies.’’ These morphologies are found among local, but generally less luminous, galaxies. Distant blue galaxies also include apparently normal late-type spirals. These findings could imply modest bursts of star formation caused by mergers or interactions of small, gas-rich galaxies with each other or with larger, well-formed galaxies. This first glimpse of very faint z ~ 1 field galaxies of diverse colors and morphologies suggests that a mixture of physical processes is at work in the formation and evolution of faint field galaxies. | | Source: | arXiv, astro-ph/9604113 | | Services: | Forum | Review | PDF | Favorites | |
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