J/ApJ/749/121 Surface brightness profiles of z=2 galaxies (Szomoru+, 2012)
Sizes and surface brightness profiles of quiescent galaxies at z ∼ 2.
Szomoru D., Franx M., van Dokkum P.G.
<Astrophys. J., 749, 121 (2012)>
=2012ApJ...749..121S 2012ApJ...749..121S
ADC_Keywords: Galaxies, IR ; Photometry, HST ; Morphology
Keywords: cosmology: observations - galaxies: evolution - galaxies: formation -
galaxies: high-redshift
Abstract:
We use deep Hubble Space Telescope Wide Field Camera 3 near-infrared
imaging obtained of the GOODS-South field as part of the CANDELS
survey to investigate a stellar mass-limited sample of quiescent
galaxies at 1.5<z<2.5. We measure surface brightness profiles for
these galaxies using a method that properly measures low surface
brightness flux at large radii. We find that quiescent galaxies at z∼2
very closely follow Sersic profiles, with nmedian=3.7, and have no
excess flux at large radii. Their effective radii are a factor of ∼4
smaller than those of low-redshift quiescent galaxies of similar mass.
However, there is a significant spread in sizes
(σlog10re=0.24), with the largest z∼2 galaxies lying close
to the z=0 mass-size relation. We compare the stellar mass surface
density profiles with those of massive elliptical galaxies in the
Virgo Cluster and confirm that most of the mass growth which occurs
between z∼2 and z=0 must be due to accretion of material onto the
outer regions of the galaxies. Additionally, we investigate the
evolution in the size distribution of massive quiescent galaxies. We
find that the minimum size growth required for z∼2 quiescent galaxies
to fall within the z=0 size distribution is a factor of ∼2 smaller
than the total median size growth between z∼2 and z=0.
Description:
In this paper, we expand the analysis of Szomoru et al.
(2010ApJ...714L.244S 2010ApJ...714L.244S), using a stellar mass-limited sample of 21
quiescent galaxies. We make use of deep Hubble Space Telescope Wide
Field Camera 3 (HST WFC3) data from the CANDELS GOODS-South
observations to investigate the surface brightness profiles of
quiescent galaxies at z∼2. We use the deepest publicly available data,
reduced by Koekemoer et al. (2011ApJS..197...36K 2011ApJS..197...36K), which consist of
HST/ACS I814 and HST/WFC3 J125, and H160 observations to 4 orbit
depth of a ∼60arcmin2 section of the GOODS-South field. The full
width at half-maximum of the point-spread function (PSF) is ∼0.18" for
the WFC3 observations and ∼0.11" for the ACS observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 21 Galaxy properties
table2.dat 46 830 Surface brightness profiles
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013)
J/MNRAS/427/1666 : Massive galaxies in CANDELS-UDS field (Bruce+, 2012)
J/ApJS/203/24 : Structural parameters of CANDELS galaxies (van der Wel+, 2012)
J/ApJ/742/111 : Extreme emission-line galaxies in CANDELS (van der Wel+, 2011)
J/MNRAS/400/1690 : Ages and metallicities for quiescent galaxies (Smith+, 2009)
J/ApJ/682/985 : FIREWORKS photometry of GOODS CDF-S (Wuyts+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1060/6246] Galaxy ID in FIREWORKS cat. (G1)
6- 10 F5.3 --- z Redshift from FIREWORKS cat.
11 A1 --- f_z [*] z is a photometric redshift (1)
13- 21 F9.6 deg RAdeg [53.01/53.22] Right ascension (J2000)
23- 32 F10.6 deg DEdeg [-27.89/-27.70] Declination (J2000)
34- 38 F5.2 [Msun] logM* [10.71/11.71] Log of stellar mass (2)
40- 45 F6.2 [yr-1] logSSFR [-10.68/-9.42] Specific star formation rate
47- 50 F4.2 mag U-V [1.28/2.35] Rest-frame U-V color index
52- 55 F4.2 mag V-J [0.82/1.87] Rest-frame V-J color index
57- 61 F5.2 mag Hmag [20.3/23.4] Apparent H-band AB magnitude (3)
63- 66 F4.2 mag e_Hmag [0.01/0.06] Hmag uncertainty
68- 71 F4.2 kpc re [0.39/7.1] Effective radius (3)
73- 76 F4.2 kpc e_re [0.02/1.6] re uncertainty
78- 82 F5.2 --- n [1.01/10.1] Sersic index (3)
84- 87 F4.2 --- e_n [0.05/2.4] n uncertainty
89- 92 F4.2 --- b/a [0.2/0.95] Axis ratio
94- 97 F4.2 --- e_b/a [0.01/0.04] b/a uncertainty
99-103 F5.1 deg PA [-64/80] Position angle measured
counterclockwise with respect to north
105-108 F4.1 deg e_PA [0.2/14] PA uncertainty
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Note (1):
* = No spectroscopic redshifts are available for these galaxies; photometric
redshifts are listed instead.
Note (2): Masses are corrected to account for the difference between the
catalog magnitude and our measured magnitude.
Note (3): Magnitudes, effective radii, and Sersic indices are derived from
the H160 band residual-corrected profiles discussed in Section 4.
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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- 4 I4 --- ID [1060/6246] Galaxy ID in FIREWORKS
catalog (G1)
5- 11 F7.4 arcsec rc [0/2.82] Angular circularized radius
12- 18 F7.3 kpc rkpc [0.1/24] Physical circularized radius
19- 25 F7.3 mag/arcsec2 muH [17/26.4] The H band AB surface brightness
26- 32 F7.4 mag/arcsec2 e_muH [0.0001/0.5] Error in muH
33- 39 F7.3 [Msun/kpc2] logSig [7.2/11.1] Stellar mass surface density
40- 46 F7.4 [Msun/kpc2] e_logSig [0/0.2] Error in logSig
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Global notes:
Note (G1): Wuyts et al. (2008, Cat. J/ApJ/682/985; <[WLF2008b] NNNN> in Simbad).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Nov-2013