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 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 2011ApJS..197...35G; Koekemoer et al. 2011ApJS..197...36K 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 164 59 Physical Parameters for 59 Compact SFGs in
the COSMOS Field
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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
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Bytes Format Units Label Explanations
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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
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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 2014ApJ...795..145B).
Note (2): Δz=z3D-HST-zUltraVISTA.
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 26-Oct-2017