J/ApJ/761/140 Spectroscopy of Herschel-SPIRE galaxies (Casey+, 2012)
A redshift survey of Herschel far-infrared selected starbursts and implications
for obscured star formation.
Casey C.M., Berta S., Bethermin M., Bock J., Bridge C., Budynkiewicz J.,
Burgarella D., Chapin E., Chapman S.C., Clements D.L., Conley A.,
Conselice C.J., Cooray A., Farrah D., Hatziminaoglou E., Ivison R.J.,
le Floc'h E., Lutz D., Magdis G., Magnelli B., Oliver S.J., Page M.J.,
Pozzi F., Rigopoulou D., Riguccini L., Roseboom I.G., Sanders D.B.,
Scott D., Seymour N., Valtchanov I., Vieira J.D., Viero M., Wardlow J.
<Astrophys. J., 761, 140 (2012)>
=2012ApJ...761..140C 2012ApJ...761..140C
ADC_Keywords: Galaxies, IR ; Photometry, millimetric/submm ; Redshifts ; Surveys
Keywords: galaxies: evolution; galaxies: high-redshift; galaxies: starburst;
infrared: galaxies; submillimeter: galaxies
Abstract:
We present Keck spectroscopic observations and redshifts for a sample
of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and
500µm, taken with the Keck I Low Resolution Imaging Spectrometer
and the Keck II DEep Imaging Multi-Object Spectrograph. The redshift
distribution of these SPIRE sources from the Herschel Multitiered
Extragalactic Survey (HerMES) peaks at z=0.85, with 731 sources at z<2
and a tail of sources out to z∼5. We measure more significant
disagreement between photometric and spectroscopic redshifts
(<Δz/(1+zspec)≥0.29) than is seen in non-infrared selected
samples, likely due to enhanced star formation rates and dust
obscuration in infrared-selected galaxies. The infrared data are used
to directly measure integrated infrared luminosities and dust
temperatures independent of radio or 24µm flux densities. By
probing the dust spectral energy distribution (SED) at its peak, we
estimate that the vast majority (72%-83%) of z<2 Herschel-selected
galaxies would drop out of traditional submillimeter surveys at
0.85-1mm. This work significantly increased the number of
spectroscopically confirmed infrared-luminous galaxies at z{Gt}0 and
demonstrates the growing importance of dusty starbursts for galaxy
evolution studies and the build-up of stellar mass throughout cosmic
time.
Description:
The sources observed in this paper were detected by the Herschel Space
Observatory SPIRE instrument as part of the HerMES (Oliver et al.
2012, Cat. VIII/95).
We observe sources in the Lockman Hole North (LHN) whose Spitzer
imaging comes from the Spitzer Wide-Area Infrared Extragalactic
(SWIRE) survey (Lonsdale et al. 2003PASP..115..897L 2003PASP..115..897L) and GO MIPS
programs (PI: Owen) and very deep 1.4GHz mapping from the Very Large
Array (VLA).
Optical spectroscopic observations were carried out at the W. M. Keck
Observatory using LRIS on KeckI and DEIMOS on KeckII in 2011 and 2012.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 170 731 Spectroscopically identified 0<z<2 SPIRE-selected
galaxies
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See also:
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
II/326 : Revised SWIRE photometric redshifts (Rowan-Robinson+, 2013)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
J/A+A/565/A128 : Dust SED in HRS nearby galaxies (Ciesla+, 2014)
J/A+A/551/A100 : Panchromatic SED of Herschel sources (Berta+, 2013)
J/A+A/550/A114 : Integrated spectroscopy of HRS galaxies (Boselli+, 2013)
J/A+A/543/A161 : Submm obs. of 323 HRS nearby galaxies (Ciesla+, 2012)
J/ApJ/757/13 : IR SEDs of 24um z∼0.3-3 galaxies (Sajina+, 2012)
J/ApJ/759/139 : Herschel+MIPS phot. of GOODS sources (Kirkpatrick+, 2012)
J/MNRAS/415/1479 : LESS photometric redshift survey (Wardlow+, 2011)
J/MNRAS/413/2314 : Radio & mid-IR counterpart of submm galaxies (Biggs+, 2011)
J/MNRAS/411/505 : Sub-mm observations in Extended Chandra DFS (Chapin+, 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/727/1 : IRAC/MUSYC SIMPLE survey (Damen+, 2011)
J/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010)
J/ApJS/188/178 : VLA 1.4GHz obs. of GOODS-North field (Morrison+, 2010)
J/ApJ/721/98 : Morphology of 70um COSMOS galaxies (Kartaltepe+, 2010)
J/ApJ/714/1305 : The Deep SWIRE Field (DSF) IV. (Strazzullo+, 2010)
J/MNRAS/409/L13 : Herschel-SPIRE radio galaxies (Chapman+, 2010)
J/ApJ/707/1201 : LABOCA ECDFS Submillimeter Survey (LESS) (Weiss+, 2009)
J/ApJ/692/556 : Star forming galaxy templates (Rieke+, 2009)
J/AJ/138/1261 : Spitzer/MIPS obs. of the COSMOS field (Frayer+, 2009)
J/MNRAS/395/269 : ELAIS-N1 field 325MHz observations (Sirothia+, 2009)
J/ApJS/179/114 : VLA 1.4GHz survey of E-CDF-S (Miller+, 2008)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
J/ApJS/172/46 : VLA-COSMOS survey. II. (Schinnerer+, 2007)
J/ApJ/622/772 : Redshift survey of submillimeter galaxies (Chapman+, 2005)
J/MNRAS/358/149 : HDFN SCUBA Super-map. III (Pope+, 2005)
J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)
J/ApJ/519/1 : Lyman-break galaxies at z ≳ 4 (Steidel+, 1999)
http://hermes.sussex.ac.uk/ : HerMES project home page
http://hedam.lam.fr/HerMES/ : HerMES data from HeDaM
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- --- [1HERMES]
8- 11 A4 --- XID [X1.4/X24 ] Detection band in the XID catalog:
(X24=24µm or X1.4=1.4GHz) (1)
13- 31 A19 --- Name Source name (JHHMMSS.ss+DDMMSS.s) (1)
33 A1 --- f_Name [*] near-photometric conditions (2)
35- 39 F5.3 --- zsp [0.001/1.98] Spectroscopic redshift
41 A1 --- r_zsp [DL] Instrument: L=LRIS, D=DEIMOS
43 I1 --- q_zsp [1/5] Confidence in zsp identification
(5=most confident) (3)
45- 48 F4.2 --- zph ? Photometric redshift (6)
50 A1 --- n_zph Field of the original data (4)
52- 59 F8.2 uJy S24 [-3194/2889]? Spitzer/MIPS 24um flux density (6)
61- 66 F6.1 uJy e_S24 [5.8/1117]? Uncertainty in S24
68- 72 F5.1 mJy S100 ? Spitzer/MIPS 100µm band flux density (6)
74- 76 F3.1 mJy e_S100 ? Uncertainty in S100 (6)
78- 82 F5.1 mJy S160 ? Spitzer/MIPS 160µm band flux density (6)
84- 86 F3.1 mJy e_S160 ? Uncertainty in S160 (6)
88- 92 F5.1 mJy S250 [2.4/181] Herschel 250um band flux density (5)
94- 97 F4.1 mJy e_S250 [1.5/13] Uncertainty in S250
99-102 F4.1 mJy S350 Herschel 350µm band flux density (6)(5)
104-107 F4.1 mJy e_S350 Uncertainty in S350 (6)
109-112 F4.1 mJy S500 Herschel 500µm band flux density (6)(5)
114-117 F4.1 mJy e_S500 Uncertainty in S500 (6)
119-124 F6.1 uJy S1.4 ? The VLA 1.4 GHz flux density (6)
126-130 F5.1 uJy e_S1.4 ? Uncertainty in S1.4 (6)
132-139 E8.2 Lsun LIR IR luminosity
141-148 E8.2 Lsun E_LIR Upper limit uncertainty in LIR
150-157 E8.2 Lsun e_LIR Lower limit uncertainty in LIR
159-164 F6.2 K Tdust [8/101] Dust temperature
166-170 F5.1 K e_Tdust [0/562] Uncertainty in Tdust
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Note (1): Source names indicate both detection band in the XID catalog
(24µm or 1.4GHz) and source position based on
near-infrared/optical counterparts (galaxies are
<[CBB2012] 1HERMES X1.4 JHHMMSS.ss+DDMMSS.s> (N=310) or
<[CBB2012] 1HERMES X24 JHHMMSS.ss+DDMMSS.s> (N=421) in Simbad).
Note (2):
* = source was observed in near-photometric conditions.
Note (3): Ranges from 1 to 5, 5 being the most confident (further
identifications at Conf<1 have been excluded from this paper).
Note (4): Indicates which field the data are in. Flag as follows:
U = UDS (UKIDSS Ultra-Deep Field)
S = CDFS (Chandra Deep Field South)
C = COSMOS (Scoville et al. 2007ApJS..172....1S 2007ApJS..172....1S)
L = LHN (Lockman Hole North)
G = GOODS-N (Great Observatories Origins Deep Survey North)
E = Elais-N1.
Note (5): PACS flux densities come from PEP (Lutz et al. 2011, J/A+A/532/A90)
in COSMOS and from HerMES (Oliver et al. 2012, Cat. VIII/95) in LHN.
Note (6): Note that a flux density of 99.9±9.9 or a photometric redshift
of 9.99 denotes that the given source is undetected at the corresponding
wavelength or has no photometric redshift despite having the necessary
imaging or coverage. Likewise, a blank denotes that no data exist.
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Nomenclature Notes:
Table 1: galaxies are <[CBB2012] 1HERMES X1.4 JHHMMSS.ss+DDMMSS.s> (N=310) or
<[CBB2012] 1HERMES X24 JHHMMSS.ss+DDMMSS.s> (N=421) in Simbad
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Aug-2014