J/ApJ/744/150 Dust-obscured galaxies (DOGs) at z≃2 (Bussmann+, 2012)
The star formation histories of z ∼ 2 dust-obscured galaxies and
submillimeter-selected galaxies.
Bussmann R.S., Dey A., Armus L., Brown M.J.I., Desai V., Gonzalez A.H.,
Jannuzi B.T., Melbourne J., Soifer B.T.
<Astrophys. J., 744, 150 (2012)>
=2012ApJ...744..150B 2012ApJ...744..150B
ADC_Keywords: Galaxies, IR ; Redshifts ; Photometry, infrared ;
Photometry, UBVRI
Keywords: galaxies: evolution - galaxies: fundamental parameters -
galaxies: high-redshift - galaxies: stellar content
Abstract:
The Spitzer Space Telescope has identified a population of
ultraluminous infrared galaxies (ULIRGs) at z∼2 that may play an
important role in the evolution of massive galaxies. We measure the
stellar masses (M*) of two populations of Spitzer-selected ULIRGs
that have extremely red R-[24] colors (dust-obscured galaxies, or
DOGs) and compare our results with submillimeter-selected galaxies
(SMGs). One set of 39 DOGs has a local maximum in their mid-infrared
(mid-IR) spectral energy distribution (SED) at rest frame 1.6um
associated with stellar emission ("bump DOGs"), while the other set of
51 DOGs have power-law mid-IR SEDs that are typical of obscured active
galactic nuclei ("power-law DOGs"). We measure M* by applying
Charlot & Bruzual (1991ApJ...367..126C 1991ApJ...367..126C) stellar population synthesis
models to broadband photometry in the rest-frame ultraviolet, optical,
and near-infrared of each of these populations.
Description:
For the Spitzer-selected ULIRGs, a total of 2603 dust-obscured
galaxies (DOGs) satisfying R-[24]>14 (Vega mag) and F24um>0.3mJy were
identified in the 8.6deg2 NOAO Deep Wide-Field Survey (NDWFS) Bootes
field with deep Spitzer/MIPS 24um coverage (Dey et al.
2008ApJ...677..943D 2008ApJ...677..943D). This paper focuses on the subset of 90 of these
objects that have known spectroscopic redshifts at z>1.4.
In this paper, we utilize the optical imaging of the Bootes field,
conducted using the NOAO 4m telescope on Kitt Peak. The survey reaches
5σ point-source depths in BW, R, and I of 27.1, 26.1, and 25.4
(Vega mag), respectively. NDWFS data products are publicly available
via the NOAO science archive.
The NOAO Extremely Wide Field InfraRed iMager (NEWFIRM) has conducted
a survey at near-IR wavelengths of the full 9.3deg2 Bootes field
using the NOAO 4m telescope on Kitt Peak during the spring semesters
of 2008 and 2009. The nominal 5σ limits of the survey within a
3" diameter aperture in J, H, and Ks are 22.05, 21.3, and 19.8 (Vega
mag), respectively. All of the survey data are publicly available (A.
H. Gonzalez et al. 2011, in preparation).
The SDWFS (Spitzer Deep Wide-field Survey; Ashby et al. 2009,
Cat. J/ApJ/716/530) is a four-epoch survey of roughly 8.5deg2 of the
Bootes field of the NDWFS. The first epoch of the survey took place in
2004 January. The final co-added images have 5σ depths of 19.77,
18.83, 16.50, and 15.85 (Vega mag) at 3.6um, 4.5um, 5.8um, and 8.0um,
respectively.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 68 90 Basic dust-obscured galaxy (DOG) spectroscopic
sample properties
table2.dat 133 90 *Optical, near-IR, and mid-IR photometry of DOGs
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Note on table2.dat: Note that all measurements and their uncertainties are
reported, regardless of whether the measurement is statistically significant.
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See also:
J/ApJ/735/86 : NEWFIRM MBS: photometric catalogs (Whitaker+, 2011)
J/ApJ/716/530 : Mid-IR variability from the SDWFS (Kozlowski+, 2010)
J/A+A/467/565 : z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007)
J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z∼2 ULIRGs (Yan+, 2007)
J/ApJ/634/L1 : 16µm sources in the NOAO Bootes field (Kasliwal+, 2005)
J/AJ/128/1 : First Look Survey: NOAO R-band Mosaic (Fadda+, 2004)
http://archive.noao.edu/nsa/ : NOAO Science Archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [SST24]
7- 22 A16 --- SST24 Identifier (JHHMMSS.s+DDMMSS)
24- 34 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
36- 45 F10.7 deg DEdeg Declination in decimal degrees (J2000)
47- 51 F5.3 --- z [1.4/4.5] Redshift (1)
52 A1 --- r_z [SK] Origin of redshift: Spitzer or Keck (1)
54- 62 A9 --- Type "Bump" or "Power law" source (2)
64 A1 --- l_R-[24] Limit flag on R-[24]
65- 68 F4.1 mag R-[24] [13.8/17] R-[24] color index (system Vega)
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Note (1): Redshifts are from:
S = Spitzer/IRS (z has two-decimal point precision): Houck et al.
2005ApJ...622L.105H 2005ApJ...622L.105H, <[HSW2005] SST24 JHHMMSS.ss+DDMMSS.s> in Simbad;
Weedman et al. 2006ApJ...653..101W 2006ApJ...653..101W, <[WPL2006] ANN> in Simbad.
K = Keck spectroscopy (z has three decimal point precision):
B.T. Soifer et al. 2011, in preparation)
Note (2): The spectroscopic sample consists of 39 star-formation-dominated
"bump" sources (those that show a peak at rest frame 1.6um) and 51
AGN-dominated "power-law" sources. Bump and power-law dust-obscured
galaxies (DOGs) are separated according to the statistical criteria
given in Section 3.1.2 of Dey et al. (2008ApJ...677..943D 2008ApJ...677..943D).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [SST24]
7- 22 A16 --- SST24 Identifier (JHHMMSS.s+DDMMSS)
24- 28 F5.2 uJy FBw [-0.13/1.66] NOAO Bw-band flux density
30- 33 F4.2 uJy e_FBw FBw uncertainty
35- 39 F5.2 uJy FR NOAO R-band flux density
41- 44 F4.2 uJy e_FR FR uncertainty
46- 50 F5.2 uJy FI [-0.16/2.66] NOAO I-band flux density
52- 55 F4.2 uJy e_FI FI uncertainty
57- 60 F4.1 uJy FJ [-2/13.3] NOAO J-band flux density
62- 64 F3.1 uJy e_FJ FJ uncertainty
66- 69 F4.1 uJy FH [-4.3/23.4] NOAO H-band flux density
71- 73 F3.1 uJy e_FH FH uncertainty
75- 78 F4.1 uJy FKs [-3.2/49] NOAO Ks-band flux density
80- 82 F3.1 uJy e_FKs FKs uncertainty
84- 88 F5.1 uJy F3.6 [0/126.2] Spitzer/IRAC 3.6um-band flux density
90- 92 F3.1 uJy e_F3.6 F3.6 uncertainty
94- 98 F5.1 uJy F4.5 [0/200.7] Spitzer/IRAC 4.5um-band flux density
100-102 F3.1 uJy e_F4.5 F4.5 uncertainty
104-108 F5.1 uJy F5.8 [0/497.8] Spitzer/IRAC 5.8um-band flux density
110-113 F4.1 uJy e_F5.8 [5.6/33.1] F5.8 uncertainty
115-119 F5.1 uJy F8 [0/952.7] Spitzer/IRAC 8um-band flux density
121-124 F4.1 uJy e_F8 F8 uncertainty
126-129 I4 uJy F24 [330/3840] Spitzer/MIPS 24um-band flux density
131-133 I3 uJy e_F24 [33/384] F24 uncertainty
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 20-Jun-2013