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J/ApJ/807/139  Physical parameters of compact SFGs in COSMOS field (Fang+, 2015)

Physical properties of compact star-forming galaxies at z∼2-3. Fang G., Ma Z., Kong X., Fan L. <Astrophys. J., 807, 139 (2015)> =2015ApJ...807..139F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Redshifts ; Colors ; Galaxies, photometry ; Morphology Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: structure Abstract: We present a study on the physical properties of compact star-forming galaxies (cSFGs) with M*≥1010 M and 2≤z≤ 3 in the COSMOS (Cosmic Evolution Survey) and GOODS-S (Great Observatories Origins Deep Survey South) fields. We find that massive cSFGs have a comoving number density of (1.0±0.1)x10-4 Mpc-3. The cSFGs are distributed at nearly the same locus on the main sequence as extended star-forming galaxies (eSFGs) and dominate the high-mass end. On the rest-frame U-V versus V-J and U-B versus MB diagrams, cSFGs are mainly distributed at the middle of eSFGs and compact quiescent galaxies (cQGs) in all colors, but are more inclined to "red sequence" than "green valley" galaxies. We also find that cSFGs have distributions similar to cQGs on the nonparametric morphology diagrams. The cQGs and cSFGs have larger Gini and smaller M20, while eSFGs have the reverse. About one-third of cSFGs show signatures of postmergers, and almost none of them can be recognized as disks. Moreover, those visually extended cSFGs all have lower Gini coefficients (Gini<0.4), indicating that the Gini coefficient could be used to clean out noncompact galaxies in a sample of candidate cSFGs. The X-ray-detected counterparts are more frequent among cSFGs than in eSFGs and cQGs, implying that cSFGs have previously experienced violent gas-rich interactions (such as major mergers or disk instabilities), which could trigger both star formation and black hole growth in an active phase. Description: Our study is based on a sample of high-redshift massive galaxies that is built from 3D-HST (Skelton et al. 2014, J/ApJS/214/24) and CANDELS (Grogin et al. 2011ApJS..197...35G; Koekemoer et al. 2011ApJS..197...36K) data. The 3D-HST and CANDELS programs have provided WFC3 and ACS spectroscopy and photometry over ∼900 arcmin2 in five fields: AEGIS, COSMOS, GOODS-north, GOODS-south, and the UKIDSS UDS field. All of these fields have a wealth of publicly available imaging data sets in addition to the HST data, which makes it possible to construct the SEDs of objects over a wide wavelength range (Skelton et al. 2014, J/ApJS/214/24). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 164 59 Physical Parameters for 59 Compact SFGs in the COSMOS Field
See also: II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012) J/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013) J/ApJ/793/101 : CANDELS z∼2 galaxy properties (Trump+, 2014) J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID [01/59] Object identification number 3 A1 --- n_ID [ab] Note on ID (1) 5- 14 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 16- 23 F8.6 deg DEdeg Declination in decimal degrees (J2000) 25- 28 F4.2 --- z Redshift 30- 34 F5.2 --- Deltaz Redshift difference (2) 36- 39 F4.2 [Msun/yr] logSFR Log of star formation rate 41- 44 F4.2 [Msun/yr] e_logSFR Uncertainty in logSFR 46- 50 F5.2 [Msun] logM* Log of stellar mass 52- 55 F4.2 [Msun] e_logM* Uncertainty in logM* 57- 59 F3.1 mag Av Absorption in V-band 61- 63 F3.1 mag e_Av Uncertainty in Av 65- 67 F3.1 [yr] logAge Log of age 69- 71 F3.1 [yr] e_logAge Uncertainty in logAge 73- 76 F4.2 kpc Reff Effective radius 78- 81 F4.2 kpc e_Reff Uncertainty in Reff 83- 86 F4.2 --- n Sersic index 88- 91 F4.2 --- e_n Uncertainty in n 93- 96 F4.2 --- b/a Axis ratio 98-101 F4.2 --- e_b/a Uncertainty in b/a 103-106 F4.2 --- Gini Gini coefficient 108-111 F4.2 --- e_Gini Uncertainty in Gini 113-117 F5.2 --- M20 Second-order moment of the brightest 20% of the galaxy's flux 119-122 F4.2 --- e_M20 Uncertainty in M20 124-127 F4.2 mag U-V U-V color index (AB) 129-132 F4.2 mag e_U-V Uncertainty in U-V 134-137 F4.2 mag V-J V-J color index (AB) 139-142 F4.2 mag e_V-J Uncertainty in V-J 144-147 F4.2 mag U-B U-B color index (AB) 149-152 F4.2 mag e_U-B Uncertainty in U-B 154-159 F6.2 mag Bmag HST B-band AB magnitude 161-164 F4.2 mag e_Bmag Uncertainty in Bmag
Note (1): Note as follows: a = Eight cSFGs with Gini<0.4 and extended visual morphologies; b = cSFG with spectroscopic redshift zspec=2.095 in Barro et al. (2014ApJ...795..145B). Note (2): Δz=z3D-HST-zUltraVISTA.
History: From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 26-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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