J/MNRAS/401/1521 Stellar masses of Lyman break galaxies at z∼3 (Magdis+, 2010)
On the stellar masses of IRAC detected Lyman break galaxies at z ∼ 3.
Magdis G.E., Rigopoulou D., Huang J.-S., Fazio G.G.
<Mon. Not. R. Astron. Soc., 401, 1521-1531 (2010)>
=2010MNRAS.401.1521M 2010MNRAS.401.1521M
ADC_Keywords: Galaxy catalogs ; Photometry ; Redshifts ; Stars, masses
Keywords: catalogues - galaxies: high-redshift - early Universe
Abstract:
We present results of a large survey of the mid-infrared (mid-IR)
properties of 248 Lyman Break Galaxies (LBGs) with confirmed
spectroscopic redshift using deep Spitzer/Infrared Array Camera (IRAC)
observations in six cosmological fields. By combining the new mid-IR
photometry with optical and near-infrared observations, we model the
spectral energy distributions (SEDs) employing a revised version of
the Bruzual and Charlot synthesis population code that incorporates a
new treatment of the thermal-pulsating asymptotic giant branch phase
(CB07). Our primary aim is to investigate the impact of the AGB phase
in the stellar masses of the LBGs, and compare our new results with
previous stellar mass estimates. We investigate the stellar mass of
the LBG population as a whole and assess the benefits of adding longer
wavelengths to estimates of stellar masses for high-redshift galaxies.
Description:
The data for this study have been obtained with the (IRAC) on board
the Spitzer Space Telescope. The majority of our data are part of the
IRAC GTO program (PI G. Fazio) and include the fields: Q1422+2309
(Q1422), DSF2237a,b (DSF), Q2233+1341 (Q2233), SSA22a,b (SSA22)
and B20902+34 (B0902) while data for the HDF-N come from the Great
Observatories Origin Deep Survey program (GOODS, PI M. Dickinson).
The data analysis and the mid-IR identification of the LBGs in
these fields have been presented in detail by Magdis et al.
(2008MNRAS.386...11M 2008MNRAS.386...11M). Based on a catalogue of 1261 LBGs by
Steidel et al. (2003, Cat. J/ApJ/592/728) in these fields, we
constructed a mid-IR sample of 751 LBGs, that were observed in
at least one IRAC band.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 249 Mid-IR Photometric catalogue (AB magnitude) of
LBGs (Lyman Break Galaxies) with confirmed
spectroscopic z
table2.dat 40 194 CB07 best fit stellar population parameters
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See also:
J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Source name
18- 22 F5.3 --- z Spectroscopic redshift
24- 27 F4.2 mag Un-G Optical Un-G colour index
29- 33 F5.2 mag G-R Optical G-R colour index
35- 39 F5.2 mag Rmag R magnitude
41- 45 F5.2 mag 3.6um ? Spitzer/IRAC 3.6um magnitude (AB scale)
47- 50 F4.2 mag e_3.6um ? rms uncertainty on 3.6um
52- 56 F5.2 mag 4.5um ? Spitzer/IRAC 4.5um magnitude (AB scale)
58- 61 F4.2 mag e_4.5um ? rms uncertainty on 4.5um
63- 67 F5.2 mag 5.8um ? Spitzer/IRAC 5.8um magnitude (AB scale)
69- 72 F4.2 mag e_5.8um ? rms uncertainty on 5.8um
74- 78 F5.2 mag 8.0um ? Spitzer/IRAC 8.0um magnitude (AB scale)
80- 83 F4.2 mag e_8.0um ? rms uncertainty on 8.0um
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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- 16 A16 --- Name Source name (1)
18- 23 F6.3 10+9solMass Mass Mass
25- 29 F5.3 10+9solMass e_Mass rms uncertainty on Mass
31- 34 I4 Myr Age Age (million years)
36- 40 F5.3 mag E(B-V) Redenning
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Note (1): We did not fit the stellar populations of galaxies that had no
data longward of R-band, had uncertain redshifts, or are identified
as AGN/QSO from their optical spectra. We also do not present SED
parameters for those galaxies with optical and IRAC photometry
inconsistent with a simple stellar population (these sources had
large χ2>10.
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History:
* 09-Jul-2010: From electronic version of the journal
* 05-May-2011: In table1, SSA22a-oct96C1 corrected into SSA22a-oct96C1
(End) Patricia Vannier [CDS] 26-May-2010