J/ApJ/791/18 Galaxy samples rest-frame ultraviolet structure (Bond+, 2014)
The rest-frame ultraviolet structure of 0.5 < z < 1.5 galaxies.
Bond N.A., Gardner J.P., De Mello D.F., Teplitz H.I., Rafelski M.,
Koekemoer A.M., Coe D., Grogin N., Gawiser E., Ravindranath S., Scarlata C.
<Astrophys. J., 791, 18 (2014)>
=2014ApJ...791...18B 2014ApJ...791...18B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Ultraviolet ; Redshifts ; Morphology
Keywords: cosmology: observations - galaxies: formation -
galaxies: high-redshift - galaxies: structure
Abstract:
We present the rest-frame UV wavelength dependence of the
Petrosian-like half-light radius (r50), and the concentration
parameter for a sample of 198 star-forming galaxies at 0.5 < z < 1.5.
We find a ∼5% decrease in r50 from 1500 Å to 3000 Å, with
half-light radii at 3000 Å ranging from 0.6 kpc to 6 kpc. We also
find a decrease in concentration of ∼0.07 (1.9 < C3000< 3.9). The
lack of a strong relationship between r50and wavelength is
consistent with a model in which clumpy star formation is distributed
over length scales comparable to the galaxy's rest-frame optical
light. While the wavelength dependence of r50is independent of size
at all redshifts, concentration decreases more sharply in the far-UV
(∼1500 Å) for large galaxies at z ∼ 1. This decrease in
concentration is caused by a flattening of the inner ∼20% of the light
profile in disk-like galaxies, indicating that the central regions
have different UV colors than the rest of the galaxy. We interpret
this as a bulge component with older stellar populations and/or more
dust. The size-dependent decrease in concentration is less dramatic at
z ∼ 2, suggesting that bulges are less dusty, younger, and/or less
massive than the rest of the galaxy at higher redshifts.
Description:
In this paper, we use data taken as part of a program (GO 11563, PI:
Teplitz) to obtain UV imaging of the Hubble Ultra Deep Field
(hereafter UVUDF) and study intermediate-redshift galaxy structure in
the F336W, F275W, and F225W filters, complementing existing optical
and near-IR measurements from the 2012 Hubble Ultra Deep Field
(HUDF12; Ellis et al. 2013ApJ...763L...7E 2013ApJ...763L...7E) survey. We use AB
magnitudes throughout and assume a concordance cosmology with
H0=71 km/s/Mpc, ωm=0.27, and ωλ=0.73 (Spergel
et al. 2007ApJS..170..377S 2007ApJS..170..377S). The UVUDF data and the optical Hubble
Ultradeep Field (UDF; Beckwith et al. 2006, J/AJ/132/1729) are both
contained within a single deep field in the Great Observatories
Origins Deep Survey South. The new UVUDF data include imaging in three
filters (F336W, F275W, and F225W), obtained in 10 visits, for a total
of 30 orbits per filter. In addition, from the UDF, we make use of
deep drizzled images taken in the observed optical with the F435W,
F606W, and F775W filters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 198 Galaxy Samples
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See also:
III/167 : Atlas of UV spectra of star-forming galaxies (Kinney+ 1993)
J/ApJS/147/1 : Classification of nearby galaxies (Conselice+, 2003)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
J/AJ/132/926 : Galaxies in the Hubble Ultra Deep Field (Coe+, 2006)
J/ApJ/706/553 : Fluxes in nearby star-forming galaxies (Boquien+, 2009)
J/A+A/556/A55 : Multi-color photometry of star-forming galaxies (Ilbert+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [CBS2006] Galaxy number according to Coe et al.
(2006, J/AJ/132/926)
[CBS2006] NNNNN in Simbad
7 I1 h RAh Hour of Right Ascension (J2000) (1)
9- 10 I2 min RAm Minute of Right Ascension (J2000) (1)
12- 17 F6.3 s RAs Second of Right Ascension (J2000) (1)
19 A1 --- DE- Sign of the Declination (J2000) (1)
20- 21 I2 deg DEd Degree of Declination (J2000) (1)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000) (1)
26- 31 F6.3 arcsec DEs Arcsecond of Declination (J2000) (1)
33- 37 F5.3 --- z Photometric redshift
39- 44 F6.2 mag Mag1500 1500 Å rest-frame Absolute magnitude
46- 49 F4.2 mag e_Mag1500 Error on Mag1500
51- 55 F5.3 arcsec r3000 Petrosian-like half-light radius (r50) at
rest-frame 3000 Å
(1976ApJ...209L...1P 1976ApJ...209L...1P) (2)
57- 61 F5.3 arcsec e_r3000 Error on r3000
63- 66 F4.2 --- C3000 Concentration parameter at rest-frame
2976 Å (3)
68- 71 F4.2 --- e_C3000 Error on C3000
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Note (1): Position based on an optical+IR detection image
(M. Rafelski et al., in preparation).
Note (2): Specifically, the radial distance at which the local surface
brightness is half of the internal surface brightness, r50 = r(η = 0.5),
and η(r)=I(r)/<I(<r)>. This quantity is approximately equal to the
half-light radius.
Note (3): We define the concentration following Kent (1985ApJS...59..115K 1985ApJS...59..115K)
and Conselice (2003, J/ApJS/147/1)
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 23-Mar-2017