J/ApJ/571/136 DEEP Groth Strip survey. X. (Im+, 2002)
The DEEP Groth Strip survey.
X. Number density and luminosity function of field E/S0 galaxies at z<1.
Im M., Simard L., Faber S.M., Koo D.C., Gebhardt K., Willmer C.N.A.,
Phillips A., Illingworth G., Vogt N.P., Sarajedini V.L.
<Astrophys. J. 571, 136 (2002)>
=2002ApJ...571..136I 2002ApJ...571..136I
ADC_Keywords: Galaxies, photometry ; Redshifts
Keywords: cosmology: observations - galaxies: evolution -
galaxies: luminosity function, mass function
Abstract:
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<I<22 within
the GSS, for which 44 spectroscopic redshifts (zspec) are available.
Most of the galaxies with spectroscopic redshifts (86%) form a "red
envelope" in the redshift-color diagram, consistent with predictions
of spectral synthesis models in which the dominant stellar population
is formed at redshifts z≳1.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 68 145 Quantitatively Selected E/S0s in the Groth Strip
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See also:
J/ApJS/142/1 : DEEP Groth Strip survey. II (Simard+, 2002)
J/ApJ/599/1006 : DEEP Groth Strip Survey. VII (Kobulnicky+, 2003)
J/ApJS/157/175 : DEEP Groth Strip Survey. VIII (Koo+, 2005)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [ISF2002] GSS E/S0s galaxy identification
10- 15 F6.4 --- zphot ? Photometric redshift
17- 22 F6.4 --- zspect ? Spectroscopic redshift
24- 28 F5.2 mag Imag The I band (F814W) total magnitude
30- 34 F5.2 mag Vmag The V band (F606W) total magnitude
36- 39 F4.2 mag V-I The (V-I) color
41- 46 F6.2 mag BMag Rest frame absolute B band magnitude (see
section 4.2.1)
48- 51 F4.2 --- B/T Bulge-to-total light ratio in I band (1)
53- 56 F4.2 --- R Residual parameter in I band (1) (2)
58- 62 F5.2 0.1arcsec Rad The I band half light radius
64- 67 F4.2 --- Eps Galaxy ellipticity (see section 3.8)
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Note (1): The general trend is such that early-type galaxies have small R
and large B/T, while late-type galaxies have large R and small B/T.
Note (2): To quantify the residual images, we use the residual parameter,
R, as defined by Schade et al. (1995ApJ...451L...1S 1995ApJ...451L...1S, 1999ApJ...525...31S 1999ApJ...525...31S).
The quantity R is called the "asymmetry parameter" in these papers,
but we adopt a different name, "residual parameter," since R measures
how irregular the galaxy is, how prominent the spiral arms are, and
how discrepant the galaxy surface brightness distribution is from the
simple bulge+disk model, in addition to mere asymmetry. See Section
3.3 of the paper for more details
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History:
From electronic version of the journal
References:
Vogt et al., Paper I 2005ApJS..159...41V 2005ApJS..159...41V
Simard et al., Paper II 2002ApJS..142....1S 2002ApJS..142....1S, Cat. J/ApJS/142/1
Weiner et al., Paper III 2005ApJ...620..595W 2005ApJ...620..595W
Kobulnicky et al., Paper VII 2003ApJ...599.1006K 2003ApJ...599.1006K, Cat. J/ApJ/599/1006
Koo et al., Paper VIII 2005ApJS..157..175K 2005ApJS..157..175K, Cat. J/ApJS/157/175
Gebhardt et al., Paper IX 2003ApJ...597..239G 2003ApJ...597..239G
Im et al. Paper X 2002ApJ...571..136I 2002ApJ...571..136I, Cat. J/ApJ/571/136
Kobulnicky et al., Paper XII 2002AAS...201.5218K 2002AAS...201.5218K
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 13-Sep-2002