J/ApJ/763/73 Surface density profiles of GOODS-South galaxies (Szomoru+, 2013)
The stellar mass structure of massive galaxies from z = 0 to z = 2.5: surface
density profiles and half-mass radii.
Szomoru D., Franx M., van Dokkum P.G., Trenti M., Illingworth G.D.,
Labbe I., Oesch P.
<Astrophys. J., 763, 73 (2013)>
=2013ApJ...763...73S 2013ApJ...763...73S
ADC_Keywords: Galaxies, optical ; Morphology ; Photometry, SDSS ; Redshifts
Keywords: cosmology: observations; galaxies: evolution; galaxies: formation;
galaxies: high-redshift
Abstract:
We present stellar mass surface density profiles of a mass-selected
sample of 177 galaxies at 0.5<z<2.5, obtained using very deep Hubble
Space Telescope optical and near-infrared data over the GOODS-South
field, including recent CANDELS data. Accurate stellar mass surface
density profiles have been measured for the first time for a complete
sample of high-redshift galaxies more massive than 1010.7M☉.
The key advantage of this study compared to previous work is that the
surface brightness profiles are deconvolved for point-spread function
smoothing, allowing accurate measurements of the structure of the
galaxies. The surface brightness profiles account for contributions
from complex galaxy structures such as rings and faint outer disks.
Mass profiles are derived using radial rest-frame ug color profiles
and a well-established empirical relation between these colors and the
stellar mass-to-light ratio. We derive stellar half-mass radii from
the mass profiles, and find that these are on average ∼25% smaller
than rest-frame g-band half-light radii. This average size difference
of 25% is the same at all redshifts, and does not correlate with
stellar mass, specific star formation rate, effective surface density,
Sérsic index, or galaxy size. Although on average the difference
between half-mass size and half-light size is modest, for
approximately 10% of massive galaxies this difference is more than a
factor of two. These extreme galaxies are mostly extended, disk-like
systems with large central bulges. These results are robust, but could
be impacted if the central dust extinction becomes high. ALMA
observations can be used to explore this possibility. These results
provide added support for galaxy growth scenarios wherein massive
galaxies at these epochs grow by accretion onto their outer regions.
Description:
We make use of deep near-IR imaging of the GOODS-South field, obtained
with HST/WFC3 as part of the Cosmic Assembly Near-infrared Deep
Extragalactic Legacy Survey (CANDELS; Grogin et al.
2011ApJS..197...35G 2011ApJS..197...35G; Koekemoer et al. 2011ApJS..197...36K 2011ApJS..197...36K). When
completed, this survey will cover ∼700arcmin2 to 2 orbit depth in
I814, J125, and H160 (COSMOS, EGS, and UDS fields), as well as
∼120arcmin2 to 12 orbit depth (GOODS-South and GOODS-North fields).
We use the deepest currently available data, which consist of nine
orbits in J125 and H160 taken over GOODS-South. These NIR data are
combined with deep HST/ACS data in the B435, V606, I775, and
Z850 filters from the Great Observatories Origins Deep Survey (GOODS
ACS v2.0; Giavalisco et al. 2004, Cat. II/261). The FWHM of the PSF is
∼0.12-0.18arcsec for the WFC3 observations and ∼0.1arcsec for the ACS
observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 135 397 Galaxy properties
table2.dat 89 29745 Stellar mass surface density profiles
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/ApJ/749/121 : Surface brightness profiles of z=2 galaxies (Szomoru+, 2012)
J/ApJ/743/146 : HST/WFC3 observations in HUDF and GOODS-S (Cameron+, 2011)
J/ApJ/735/L22 : HUDF galaxy properties at z∼2 (Szomoru+, 2011)
J/ApJS/183/295 : A K-selected catalog of the ECDFS from MUSYC (Taylor+, 2009)
J/ApJ/682/985 : FIREWORKS photometry of GOODS CDF-S (Wuyts+, 2008)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
http://sdss.physics.nyu.edu/vagc : Online NYU Value-Added Galaxy Catalog
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [981/2105429] Galaxy identifier (G1)
9- 12 F4.2 --- z [0.06/2.4] Redshift
14- 18 F5.2 [Msun] logM* [10.7/12.5] Log of stellar mass
20- 25 F6.2 [yr-1] logsSFR Log of specific star formation rate
(star formation rate per unit stellar mass)
27- 31 F5.2 mag umag [15.7/25.7] Rest-frame u band AB magnitude
33- 36 F4.2 mag e_umag [0.08/0.2] Error in umag
38- 42 F5.2 mag gmag Rest-frame g band AB magnitude
44- 47 F4.2 mag e_gmag Error in gmag
49- 53 F5.2 --- G(u-g) Rest-frame u-g color gradient (1)
55- 58 F4.2 --- e_G(u-g) Error in G(u-g)
60- 64 F5.2 --- G(ml) Mass-to-light ratio gradient (2)
66- 69 F4.2 --- e_G(ml) Error in G(ml)
71- 75 F5.2 kpc r.u Rest-frame u band half-light radius ru
77- 80 F4.2 kpc e_r.u Error in Ru
82- 86 F5.2 kpc r.g Rest-frame g band half-light radius rg
88- 91 F4.2 kpc e_r.g Error in Rg
93- 97 F5.2 kpc r.m [0.1/16.1] Half-mass radius rmass
99-102 F4.2 kpc e_r.M [0.01/4.5] Error in r.M
104-108 F5.2 --- n.u Sersic index in rest-frame u band nu
110-113 F4.2 --- e_n.u Error in n.u
115-119 F5.2 --- n.g Sersic index in rest-frame g band ng
121-124 F4.2 --- e_n.g Error in n.g
126-130 F5.2 --- n.M Sersic index of mass distribution nmass
132-135 F4.2 --- e_n.M Error in n.M
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Note (1): ∇(u-g)=∂(u-g)/∂(log r).
Note (2): ∇(log(M/L))=∂(log M/L)/∂(log r).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [981/2105429] Galaxy identifier (G1)
9- 12 F4.2 --- z [0.06/2.4] Redshift
14- 21 F8.4 arcsec r" [0.01/221.3] Circularized radius in arcsec
23- 29 F7.3 kpc rkpc Circularized radius in kpc
31- 36 F6.3 mag/arcsec2 mu.u ?=99.999 Rest-frame u band surface brightness
38- 44 F7.4 mag/arcsec2 e_mu.u ?=99.9999 Error in mu.u
46- 51 F6.3 mag/arcsec2 mu.g ?=99.999 Rest-frame g band surface brightness
53- 59 F7.4 mag/arcsec2 e_mu.g ?=99.9999 Error in mu.g
61- 66 F6.3 [Msun/Lsun] logml Log stellar mass-to-light ratio in
the rest-frame g band
68- 74 F7.4 [Msun/Lsun] e_logml ?=99.9999 Error logml
76- 81 F6.3 [Msun/kpc2] Sig [0/11.7] log(stellar mass surface density)
83- 89 F7.4 [Msun/kpc2] e_Sig [0.13/99.9999]?=99.9999 Error in Sig
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Global notes:
Note (G1):
* Galaxies with 0.5<z<1.5 (ID 981 to 6295, rows #1 to #177) in FIREWORKS
catalog (Wuyts et al. 2008, J/ApJ/682/985; <[WLF2008b] NNNN> in Simbad).
* Galaxies with z<0.5 (ID 2321 to 2105429, rows #178 to #397) in NYU-VAGC
catalog (Blanton et al. 2005AJ....129.2562B 2005AJ....129.2562B;
http://sdss.physics.nyu.edu/vagc).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Oct-2014