J/ApJ/706/158 Early-type galaxies in PEARS (Ferreras+, 2009)
Early-type galaxies in the PEARS survey: probing the stellar populations at
moderate redshift.
Ferreras I., Pasquali A., Malhotra S., Rhoads J., Cohen S., Windhorst R.,
Pirzkal N., Grogin N., Koekemoer A.M., Lisker T., Panagia N., Daddi E.,
Hathi N.P.
<Astrophys. J., 706, 158-169 (2009)>
=2009ApJ...706..158F 2009ApJ...706..158F
ADC_Keywords: Galaxies, photometry ; Morphology ; Photometry, HST ; Redshifts
Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: stellar content
Abstract:
Using Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS)
slitless grism spectra from the PEARS program, we study the stellar
populations of morphologically selected early-type galaxies in the
GOODS North and South fields. The sample - extracted from a visual
classification of the (v2.0) HST/ACS images and restricted to
redshifts z>0.4 - comprises 228 galaxies (iF775W<24mag, AB) out to
z≲1.3 over 320arcmin2, with a median redshift zM=0.75. This work
significantly increases our previous sample from the GRAPES survey in
the HUDF (18 galaxies over ∼11arcmin2). The grism data allow us to
separate the sample into "red" and "blue" spectra, with the latter
comprising 15% of the total. Three different grids of models
parameterizing the star formation history are used to fit the
low-resolution spectra.
Description:
In this paper, we extend the analysis of Pasquali et al.
(2006ApJ...636..115P 2006ApJ...636..115P) to a sample of early-type galaxies that is a
factor of 11 larger than in the HUDF. The objects (228 in total) are
extracted from the sample of morphologically selected early-type
galaxies of Ferreras et al. (2009MNRAS.395..554F 2009MNRAS.395..554F) in the GOODS North
and South fields and have been observed as part of PEARS. Throughout
this paper, a standard ΛCDM cosmology from the WMAP five-year
data is used to determine ages and rest-frame properties (Komatsu et
al. 2009ApJS..180..330K 2009ApJS..180..330K).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 228 Catalog of PEARS early-type galaxies: observed data
table3.dat 72 228 Catalog of PEARS early-type galaxies: physical
properties in chemical enrichment (CSP) model
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See also:
J/ApJ/695/1591 : Spectrophotometry in PEARS fields (Pirzkal+, 2009)
J/AJ/135/1624 : PEARS emission-line galaxies (Straughn+, 2008)
J/ApJ/666/863 : GOODS MIPS early-type galaxies (Van Der Wel+, 2007)
J/ApJ/650/148 : GOODS blue early-type galaxies (Lee+, 2006)
J/ApJ/635/243 : Sample of GOODS/CDFS early-type galaxies (Ferreras+, 2005)
J/AJ/129/2138 : Centers of early-type galaxies with HST (Lauer+, 2005)
J/AJ/127/131 : NICMOS early-type galaxies (Stanford+, 2004)
http://archive.stsci.edu/prepds/pears/ : PEARS (Probing Evolution And
Reionization Spectroscopically) home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- PEARS PEARS (Probing Evolution And Reionization
Spectroscopically) identification number
9- 19 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000)
22- 31 F10.6 deg DEdeg Declination in decimal degrees (J2000)
34- 38 F5.2 mag imag The HST/ACS i-band (F775W) AB magnitude
41- 45 F5.2 pix Re Half-light radius (1pixel=0.3arcsec)
48- 51 F4.2 --- z Redshift
54 I1 --- B/R [0/1] Red (0) or Blue (1) SED (1)
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Note (1): Blue/Red SED types are based on the visual inspection of the
PEARS slitless grism data.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- PEARS PEARS (Probing Evolution And Reionization
Spectroscopically) identification number
9- 13 F5.2 10+10Msun M* Stellar mass
16- 20 F5.2 mag U-V Rest-frame (U-V) color (Vega scale)
23- 28 F6.2 mag VMag Rest-frame absolute V-band (Vega scale)
31- 35 F5.2 kpc ReP Projected half-light radius
38- 41 F4.2 Gyr Average age
44- 47 F4.2 Gyr sig(t) RMS of age distribution
50- 54 F5.2 [Sun] <logZ> Average logarithmic metallicity
(relative to Sun)
57- 60 F4.2 --- beta [0/1] Outflow fraction (mass fraction of gas
ejected as a result of the ongoing
star formation)
63- 65 F3.1 --- zF Formation epoch, given by the redshift
at which infall starts
68- 72 F5.2 [Gyr] logTf Log of infall timescale
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Dec-2011