Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...571..136i&link_type=abstract
The Astrophysical Journal, Volume 571, Issue 1, pp. 136-171.
Astronomy and Astrophysics
Astronomy
119
Cosmology: Observations, Galaxies: Evolution, Galaxies: Luminosity Function, Mass Function
Scientific paper
We present the luminosity function and color-redshift relation of a magnitude-limited sample of 145 mostly red field E/S0 galaxies at z<~1 from the DEEP Groth Strip Survey (GSS). Using nearby galaxy images as a training set, we develop a quantitative method to classify E/S0 galaxies based on smoothness, symmetry, and bulge-to-total light ratio. Using this method, we identify 145 E/S0's at 16.5~1.5. We use the tight correlation between V-I and zspec for this red subset to estimate redshifts of the remaining E/S0's to an accuracy of ~10%, with the exception of a small number (16%) of blue interlopers at low redshift that are quantitatively classified as E/S0's but are not contained within the red envelope. Constructing a luminosity function of the full sample of 145 E/S0's, we find that there is about 1.1-1.9 mag brightening in rest-frame B-band luminosity back to z~=0.8 from z=0, consistent with other studies. Together with the red colors, this brightening is consistent with models in which the bulk of stars in red field E/S0's formed before zfor>~1.5 and have been evolving rather quiescently, with few large starbursts since then. Evolution in the number density of field E/S0 galaxies is more difficult to measure, and uncertainties in the raw counts and their ratio to local samples might amount to as much as a factor of 2. Within that uncertainty, the number density of red E/S0's to z~=0.8 seems relatively static, being comparable to or perhaps moderately less than that of local E/S0's, depending on the assumed cosmology. A doubling of E/S0 number density since z=1 can be ruled out with high confidence (97%) if Ωm=1. Taken together, our results are consistent with the hypothesis that the majority of luminous field E/S0's were already in place by z~1, that the bulk of their stars were already fairly old, and that their number density has not changed by large amounts since then.
Faber Sandra M.
Gebhardt Karl
Illingworth Garth
Im Myungshin
Koo David C.
No associations
LandOfFree
The DEEP Groth Strip Survey. X. Number Density and Luminosity Function of Field E/S0 Galaxies at z < 1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The DEEP Groth Strip Survey. X. Number Density and Luminosity Function of Field E/S0 Galaxies at z < 1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The DEEP Groth Strip Survey. X. Number Density and Luminosity Function of Field E/S0 Galaxies at z < 1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1727373