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
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), 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), 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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 21 Galaxy properties table2.dat 46 830 Surface brightness profiles
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
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Global notes: Note (G1): Wuyts et al. (2008, Cat. J/ApJ/682/985; <[WLF2008b] NNNN> in Simbad).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Nov-2013
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