J/ApJ/758/25 Optical properties of WISE galaxies (Hwang+, 2012)
SHELS: optical spectral properties of WISE 22 µm selected galaxies.
Hwang H.S., Geller M.J., Kurtz M.J., Dell'Antonio I.P., Fabricant D.G.
<Astrophys. J., 758, 25 (2012)>
=2012ApJ...758...25H 2012ApJ...758...25H
ADC_Keywords: Galaxies, spectra ; Redshifts ; Photometry, infrared ;
Photometry, RI ; Surveys ; Cross identifications
Keywords: galaxies: active; galaxies: evolution; galaxies: formation;
galaxies: starburst; infrared: galaxies; surveys
Abstract:
We use a dense, complete redshift survey, the Smithsonian Hectospec
Lensing Survey (SHELS), covering a 4deg2 region of a deep imaging
survey, the Deep Lens Survey (DLS), to study the optical spectral
properties of Wide-field Infrared Survey Explorer (WISE) 22µm
selected galaxies. Among 507 WISE 22µm selected sources with
(S/N)22µm≥3 (~S22µm≳2.5mJy), we identify the
optical counterparts of 481 sources (∼98%) at R<25.2 in the very deep,
DLS R-band source catalog. Among them, 337 galaxies at R<21 have SHELS
spectroscopic data. Most of these objects are at z<0.8. The infrared
(IR) luminosities are in the range
4.5x108(L☉)≲LIR≲5.4x1012(L☉). Most 22µm
selected galaxies are dusty star-forming galaxies with a small (<1.5)
4000Å break. The stacked spectra of the 22 µm selected galaxies
binned in IR luminosity show that the strength of the [O III] line
relative to Hβ grows with increasing IR luminosity. The optical
spectra of the 22µm selected galaxies also show that there are some
(∼2.8%) unusual galaxies with very strong [Ne III] λ3869, 3968
emission lines that require hard ionizing radiation such as active
galactic nuclei (AGNs) or extremely young massive stars. The specific
star formation rates (sSFRs) derived from the 3.6 and 22µm flux
densities are enhanced if the 22µm selected galaxies have close
late-type neighbors. The sSFR distribution of the 22µm selected
galaxies containing AGNs is similar to the distribution for
star-forming galaxies without AGNs. We identify 48 dust-obscured
galaxy candidates with large (≳1000) mid-IR to optical flux density
ratio. The combination of deep photometric and spectroscopic data with
WISE data suggests that WISE can probe the universe to z∼2.
Description:
The Smithsonian Hectospec Lensing Survey (SHELS) is a
magnitude-limited redshift survey covering the 4deg2 region of the
DLS (Deep Lens Survey) F2 field (Geller et al. 2005ApJ...635L.125G 2005ApJ...635L.125G,
2010ApJ...709..832G 2010ApJ...709..832G, 2012, Cat. J/AJ/143/102). The F2 field is one of
the five fields and is centered on RA=09h19m32.4s and DE=+30:00:00.
The DLS R-band images were taken in seeing 0.9"; the source detection
on these images reaches down to 28.7mag/arcsec2.
The spectroscopic observations for SHELS galaxies were conducted for
galaxies down to Rmag=20.6 with the Hectospec 300 fiber spectrograph
on the MMT (see Geller et al. 2012, Cat. J/AJ/143/102, for detailed
description of the spectroscopic observations). The spectra cover the
wavelength range 3650-9150Å with a resolution of ∼6Å.
We use the WISE all-sky survey catalog, which contains uniform
photometric data for over 563 million objects at four MIR bands (3.4,
4.6, 12, and 22um). WISE covers the entire region of the SHELS field
to a homogeneous depth.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 84 337 Optical properties of WISE 22µm selected SHELS
(Smithsonian Hectospec Lensing Survey) galaxies
table3.dat 81 337 WISE properties of 22µm selected SHELS galaxies
table4.dat 111 48 Dust-obscured galaxies in the SHELS field
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
J/AJ/143/102 : SHELS galaxies with 0.02<z<0.1 (Geller+, 2012)
J/AJ/143/7 : Spectroscopic survey of WISE-selected sources (Lake+, 2012)
J/MNRAS/421/1043 : Emission-line galaxies from SDSS DR7 (Shirazi+, 2012)
J/MNRAS/414/702 : Optical classification of southern ULIRGs (Lee+, 2011)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/A+A/533/A119 : GOODS-Herschel North and South catalogs (Elbaz+, 2011)
J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)
J/ApJ/721/98 : Morphology of 70um COSMOS galaxies (Kartaltepe+, 2010)
J/ApJ/713/970 : Low-resolution SED templates for galaxies (Assef+, 2010)
J/ApJ/713/330 : Spitzer observations of major-merger galaxies (Xu+, 2010)
J/ApJ/709/884 : Starburst-AGN composites role in LIRG mergers (Yuan+, 2010)
J/AJ/139/1857 : Sample of major galaxy pairs at z=0.08-0.38 (Woods+, 2010)
J/MNRAS/401/1521 : Lyman break galaxies stellar masses at z∼3 (Magdis+, 2010)
J/MNRAS/398/109 : Imperial IRAS-FSC redshift catalogue (IIFSCz) (Wang+, 2009)
J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)
J/ApJ/704/789 : Ultra-luminous infrared galaxies in SDSS-DR6 (Hou+, 2009)
J/ApJ/680/939 : COSMOS 24um galaxies optical spectra. I. (Caputi+, 2008)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/MNRAS/375/115 : ULIRGs galaxies in SDSS, 2dF and 6dF (Hwang+, 2007)
J/AJ/132/2243 : IR properties of close pairs of galaxies (Geller+, 2006)
J/AJ/132/197 : Close pairs of galaxies (Woods+, 2006)
J/ApJ/650/148 : GOODS blue early-type galaxies (Lee+, 2006)
J/ApJS/143/315 : IRAS 1Jy sample of ultraluminous gal. II. (Veilleux+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/337] Running sequence number
5- 26 A22 --- SHELS SHELS galaxy identification
(DDD.ddddddd+DD.ddddddd)
28- 29 I2 h RAh [9] Hour of Right Ascension (J2000)
31- 32 I2 min RAm [14/24] Minute of Right Ascension (J2000)
34- 38 F5.2 s RAs Second of Right Ascension (J2000)
40 A1 --- DE- [+] Sign of Declination (J2000)
41- 42 I2 deg DEd [28/31] Degree of Declination (J2000)
44- 45 I2 arcmin DEm Arcminute of Declination (J2000)
47- 51 F5.2 arcsec DEs Arcsecond of Declination (J2000)
54- 59 F6.3 mag Rmag [12.5/21.1] R-band magnitude
61- 67 F7.5 --- z [0.006/3.1] Redshift
69- 75 F7.5 --- e_z [0/0.005]?=0 Uncertainty in z
77- 81 F5.2 --- Dn4000 [0.7/2.1]?=-9.99 The 4000 Angstrom break
84 A1 --- Cl Galaxy classification (1)
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Note (1): Classification as follows:
H = SF(star-forming galaxy);
C = Composite;
A = AGN from optical spectra;
M = AGN from mid-IR colors;
B = Broad-line AGN;
U = Undetermined.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/337] Running sequence number
5- 23 A19 --- WISE WISE identification (JHHMMSS.ss+DDMMSS.s)
25- 29 F5.2 mJy S3.4 [0.03/27.4] WISE 3.4µm flux density
31- 34 F4.2 mJy e_S3.4 Uncertainty in S3.4
36- 40 F5.2 mJy S4.6 [0.03/18] WISE 4.6µm flux density
42- 45 F4.2 mJy e_S4.6 Uncertainty in S4.6
47- 52 F6.2 mJy S12 [0.2/105] WISE 12µm flux density
54- 57 F4.2 mJy e_S12 Uncertainty in S12
59- 64 F6.2 mJy S22 [2.4/168] WISE 22µm flux density
66- 69 F4.2 mJy e_S22 Uncertainty in S22
71- 75 F5.2 [Lsun] logL [8.6/15.4] Log of infrared luminosity
77- 81 F5.2 [Msun] logM [8.6/14.8]?=-9.99 Log of stellar mass
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID [1/48] Running sequence number
4- 22 A19 --- WISE WISE identification (JHHMMSS.ss+DDMMSS.s)
24- 29 F6.3 mag Rmag [21.6/24.8]?=99.999 R-band magnitude
31- 34 F4.2 mJy S3.4 [0.01/0.5] WISE 3.4µm flux density
36- 39 F4.2 mJy e_S3.4 [0/0.01] Uncertainty in S3.4
41- 44 F4.2 mJy S4.6 [0.03/0.6] WISE 4.6µm flux density
46- 49 F4.2 mJy e_S4.6 [0/0.02] Uncertainty in S4.6
51- 54 F4.2 mJy S12 [0.2/5.3] WISE 12µm flux density
56- 59 F4.2 mJy e_S12 [0/0.2] Uncertainty in S12
61- 65 F5.2 mJy S22 [2.5/13.4] WISE 22µm flux density
67- 70 F4.2 mJy e_S22 [0.8/1.2] Uncertainty in S22
72-111 A40 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-Jun-2014