J/MNRAS/436/430 SCUBA-2 cosmology legacy survey (Roseboom+, 2013)
The SCUBA-2 cosmology legacy survey: demographics of the 450-µm population.
Roseboom I.G., Dunlop J.S., Cirasuolo M., Geach J.E., Smail I., Halpern M.,
Van Der Werf P., Almaini O., Arumugam V., Asboth V., Auld R., Blain A.,
Bremer M.N., Bock J., Bowler R.A.A., Buitrago F., Chapin E., Chapman S.,
Chrysostomou A., Clarke C., Conley A., Coppin K.E.K., Danielson A.L.R.,
Farrah D., Glenn J., Hatziminaoglou E., Ibar E., Ivison R.J., Jenness T.,
Kampen E.V., Karim A., MacKenzie T., Marsden G., Meijerink R.,
Michalowski M.J., Oliver S.J., Page M.J., Pearson E., Scott D.,
Simpson J.M., Smith D.J.B., Spaans M., Swinbank A.M., Symeonidis M.,
Targett T., Valiante E., Viero M., Wang L., Willott C.J., Zemcov M.
<Mon. Not. R. Astron. Soc., 436, 430-448 (2013)>
=2013MNRAS.436..430R 2013MNRAS.436..430R
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, millimetric/submm
Keywords: galaxies: evolution - galaxies: starburst - submillimetre: galaxies
Abstract:
We investigate the multiwavelength properties of a sample of
450-µm-selected sources from the SCUBA-2 Cosmology Legacy Survey. A
total of 69 sources were identified above 4σ in deep SCUBA-2
450-µm observations overlapping the UDS and COSMOS fields and
covering 210arcmin2 to a typical depth of σ450=1.5mJy.
Reliable cross-identifications are found for 58 sources (84 percent)
in Spitzer and Hubble Space Telescope WFC3/IR data. The
photometric redshift distribution (dN/dz) of 450-µm-selected
sources is presented, showing a broad peak in the redshift range 1<z<3
and a median of z=1.4. Combining the SCUBA-2 photometry with
Herschel SPIRE data from HerMES, the submm spectral energy
distribution (SED) is examined via the use of modified blackbody fits,
yielding aggregate values for the IR luminosity, dust temperature and
emissivity of <LIR≥1012±0.8L☉, <TD≥42±11K and
<βD≥1.6±0.5, respectively. The relationship between these
SED parameters and the physical properties of galaxies is
investigated, revealing correlations between TD and LIR and
between βD and both stellar mass and effective radius. The
connection between the star formation rate (SFR) and stellar mass is
explored, with 24 percent of 450-µm sources found to be
`starbursts', i.e. displaying anomalously high specific SFRs. However,
both the number density and observed properties of these `starburst'
galaxies are found to be consistent with the population of normal
star-forming galaxies.
Description:
The starting point for this study is the 450- and 850-µm imaging
taken as part of the S2CLS in the deep extragalactic COSMOS and UDS
fields. Observations were taken with SCUBA-2 on the 15-m JCMT between
2011 October 2011 and 2012 July.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 95 69 *Preliminary SCUBA-2 CLS 450 micron catalogue for
COSMOS-DEEP region
tablea2.dat 95 18 *Preliminary SCUBA-2 CLS 450 micron catalogue for
UDS-DEEP region
tablea3.dat 94 54 SCUBA-2 + Herschel submm photometry for sources
in Roseboom et al. (2012MNRAS.426.1782R 2012MNRAS.426.1782R)
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Note on tablea1.dat, tablea2.dat: See table A1 of Roseboom et al.
(2012MNRAS.426.1782R 2012MNRAS.426.1782R).
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Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [S2CLS]
6- 8 A3 --- ID Designation (cNN or uNN) (G1)
9 A1 --- --- [.]
10 I1 --- m_ID ? Multiplicity index in ID (1)
12- 19 F8.4 deg RA4deg 450um right ascension (J2000)
21- 27 F7.4 deg DE4deg 450um declination (J2000)
29- 33 F5.2 mJy S450 Flux density at 450um
35- 38 F4.2 mJy e_S450 rms uncertainty on S450
40- 44 F5.2 --- SNR450 Signal-to-noise ratio at 450um
46- 50 F5.2 mJy S850 Flux density at 850um
52- 55 F4.2 mJy e_S850 rms uncertainty on S850
57- 65 F9.5 deg RAdeg Optical right ascension (J2000)
66 A1 --- u_RAdeg [:] : indicates unreliable identification (2)
68- 75 F8.5 deg DEdeg Optical declination (J2000)
76 A1 --- u_DEdeg [:] : indicates unreliable identification (2)
78- 81 F4.2 arcsec Sep [0/4] Separation optical-450µm
82 A1 --- u_Sep [:] : indicates unreliable identification (2)
84- 88 F5.2 [-] logLR [-2.2/4.7] Likelihood ratio
89 A1 --- u_logLR [:] : indicates unreliable identification (2)
91- 94 F4.2 --- zph ?=- zphot from matching optical/near-IR data
95 A1 --- u_zph [:] : indicates unreliable identification (2)
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Note (1): Where multiple good identifications for sources exist, these are
listed with the suffix.2,.3, etc.
Note (2): Sources with only unreliable identifications (i.e. logLR<1.1).
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [S2CLS]
6- 8 A3 --- ID Designation (cNN or uNN) (G1)
10- 13 F4.1 mJy S250 Flux density at 250um
15- 17 F3.1 mJy e_S250 rms uncertainty on S250
19- 22 F4.1 mJy S350 Flux density at 350um
24- 27 F4.1 mJy e_S350 rms uncertainty on S350
29- 32 F4.1 mJy S450 Flux density at 450um
34- 36 F3.1 mJy e_S450 rms uncertainty on S450
38- 41 F4.1 mJy S850 Flux density at 850um
43- 45 F3.1 mJy e_S850 rms uncertainty on S850
47- 50 F4.1 [Lsun] logLIR Infrared luminosity
52- 54 F3.1 [Lsun] e_logLIR rms uncertainty on logLIR
56- 59 F4.1 K Tdust Dust temperature
61- 64 F4.1 K E_Tdust Error on Tdust (upper value)
66- 69 F4.1 K e_Tdust Error on Tdust (lower value)
71- 74 F4.2 --- betaD ?=- Dust emissivity βD (section 5.1)
76- 78 F3.1 --- E_betaD ?=- Error on beta (upper value)
80- 83 F4.2 --- e_betaD ?=- Error on beta (lower value)
85- 88 F4.1 [Msun] logM* Stellar mass
90- 94 F5.2 [kpc] logRe Effective radius
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Global notes:
Note (G1): the recommended identification is
S2CLScNN for COSMOSDEEP region, and
S2CLSuNN for UDS-DEEP region.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Oct-2014