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J/MNRAS/458/4321       SCUBA-2 galaxies in 850um survey       (Koprowski+, 2016)

The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 µm survey, and the star-forming 'main sequence'. Koprowski M.P., Dunlop J.S., Michalowski M.J., Roseboom I., Geach J.E., Cirasuolo M., Aretxaga I., Bowler R.A.A., Banerji M., Bourne N., Coppin K.E.K., Chapman S., Hughes D.H., Jenness T., Mclure R.J., Symeonidis M., Van Der Werf P. <Mon. Not. R. Astron. Soc., 458, 4321-4344 (2016)> =2016MNRAS.458.4321K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Photometry, millimetric/submm ; Redshifts Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: starburst - cosmology: observations - submillimetre: galaxies Abstract: We investigate the properties of the galaxies selected from the deepest 850-µm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 Cosmology Legacy Survey. A total of 106 sources (>5σ) were uncovered at 850µm from an area of ~=150 arcmin2 in the centre of the COSMOS/UltraVISTA/Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field, imaged to a typical depth of σ850~=0.25mJy. We utilize the available multifrequency data to identify galaxy counterparts for 80 of these sources (75 per cent), and to establish the complete redshift distribution for this sample, yielding . We have also been able to determine the stellar masses of the majority of the galaxy identifications, enabling us to explore their location on the star formation rate:stellar mass (SFR:M*) plane. Crucially, our new deep 850-µm-selected sample reaches flux densities equivalent to SFR~=100M/yr, enabling us to confirm that sub-mm galaxies form the high-mass end of the 'main sequence' (MS) of star-forming galaxies at z>1.5 (with a mean specific SFR of sSFR=2.25±0.19Gyr-1 at z~=2.5). Our results are consistent with no significant flattening of the MS towards high masses at these redshifts. However, our results add to the growing evidence that average sSFR rises only slowly at high redshift, resulting in log10sSFR being an apparently simple linear function of the age of the Universe. Description: We used the deep 850um and 450um S2CLS imaging of the central ~=150arcmin2 of the COSMOS/UltraVISTA field, coincident with the Spitzer SEDS (Ashby et al., 2013, Cat. J/ApJ/769/80) and HST CANDELS (Grogin et al., 2011ApJS..197...35G) imaging. The observations were taken with SCUBA-2 mounted on the JCMT between October 2011 and March 2013, reaching depths of σ850~=0.25mJy and σ450~=1.5mJy (Geach et al., 2013MNRAS.432...53G, Roseboom et al., 2013, Cat. J/MNRAS/436/430, Geach et al. 2016 in preparation). In order to enable effective 450um observations, only the very best/dryest conditions were used (i.e. τ225GHz<0.05), and to maximise depth the imaging was undertaken with a "daisy" mapping pattern (Bintley et al., 2014, SPIE, 9153, 3). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 63 106 The basic properties of the 106-source SCUBA-2 850um-selected sample tablea2.dat 95 86 The results of the radio/mid-infrared statistical identification process described in Section 3 tablea3.dat 164 60 The optical-infrared photometry for the SCUBA-2 identifications that lie within the CANDELS HST imaging tablea4.dat 164 20 The optical-infrared photometry for the SCUBA-2 identifications which lie outside the CANDELS HST imaging tablea5.dat 99 106 The derived physical properties of all 106 sources in the SCUBA-2 sample
See also: J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013) J/MNRAS/436/430 : SCUBA-2 cosmology legacy survey (Roseboom+, 2013) J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014) J/ApJ/784/9 : SCUBA-2 high-redshift galaxies sample (Barger+, 2014) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID SCUBA-2 source number 5- 13 F9.5 deg RAdeg Right ascension at 850um (J2000) 15- 21 F7.5 deg DEdeg Declinationat 850um (J2000) 23- 27 F5.2 mJy S850 Flux density at 850um 29- 32 F4.2 mJy e_S850 rms uncertainty on S850 34- 38 F5.2 --- SNR850 Signal-to-noise ratio at 850um 40- 44 F5.2 mJy S450 Flux density at 450um 46- 49 F4.2 mJy e_S450 rms uncertainty on S450 51- 55 F5.2 --- SNR450 Signal-to-noise ratio at 450um 57 A1 --- l_S850/S450 Limit flag on S850/S450 58- 61 F4.2 --- S850/S450 850 to 450um flux ratio (1) 63 A1 --- Flag [0/1] Flag (2)
Note (1): SCUBA-2 colour where, if the significance of the 450um detection is less than 2σ, the SCUBA-2 colour is based on a 450um limit with S450<S450+2σ. Note (2): Flag as follows: 1 = 450um flux density was taken from 450um catalogue 0 = 450um flux density simply measured at the 850um position. It was adopted if no 450um-selected source with S450>4σ was found within 6 arcsec of the 850um source position.
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID SCUBA-2 source number 4 A1 --- n_ID [*] Note on ID (1) 6- 14 F9.5 deg RAdeg ? Optical right ascension (J2000) 16- 22 F7.5 deg DEdeg ? Optical declination (J2000) 24- 32 F9.5 deg RArdeg ? VLA 1.4GHz right ascension (J2000) 34- 40 F7.5 deg DErdeg ? VLA 1.4GHz declination (J2000) 42- 48 F7.2 uJy S8.0 ? Flux density at 8.0um 50- 53 F4.2 arcsec D8.0 ? Angular offset to SCUBA-2 850um position of 8.0um position 55- 59 F5.3 --- p8.0 ? Corrected probability that each association could have occurred by chance (2) 60 A1 --- n_p8.0 [bi] Note on p8.0 (3) 62- 65 F4.2 uJy S24 ? Flux density at 24um 67- 70 F4.2 arcsec D24 ? Angular offset to SCUBA-2 850um position of 24um position 72- 76 F5.3 --- p24 ? Corrected probability that each association could have occurred by chance (2) 77 A1 --- n_p24 [bi] Note on p24 (3) 79- 83 F5.3 uJy SVLA ? VLA flux density at 1.4GHz 85- 88 F4.2 arcsec DVLA ? Angular offset to SCUBA-2 850um position of VLA 1.4GHz position 90- 94 F5.3 --- pVLA ? Corrected probability that each association could have occurred by chance (2) 95 A1 --- n_pVLA [bi] Note on pVLA (3)
Note (1): Flag as follows: * = source for which the optical/near-infrared IDs were rejected on the basis of the zp-zLW comparison (see Section 4.2) Note (2): given the depth of the supporting data, the relevant number counts, and the counterpart search radius. If a given ID is listed more than once, the counterpart with the lowest p-value was treated as a correct association. Note (3): Flag as follows: b = robust IDs (p≤0.05) i = the more tentative IDs (0.05<p≤0.1)
Byte-by-byte Description of file: tablea[34].dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID SCUBA-2 source number 5- 13 F9.5 deg RAdeg Right ascension (J2000) 15- 21 F7.5 deg DEdeg Declination (J2000) 23- 27 F5.2 mag umag ? CFHTLS u magnitude (AB, 3"diameter aperture) 29- 32 F4.2 mag e_umag ? rms uncertainty on umag (1) 34- 38 F5.2 mag gmag ? CFHTLS g magnitude (AB, 3" diameter aperture) 40- 43 F4.2 mag e_gmag ? rms uncertainty on gmag (1) 45- 49 F5.2 mag rmag ? CFHTLS r magnitude (AB, 3" diameter aperture) 51- 54 F4.2 mag e_rmag ? rms uncertainty on rmag (1) 56- 60 F5.2 mag imag ? CFHTLS i magnitude (AB, 3" diameter aperture) 62- 65 F4.2 mag e_imag ? rms uncertainty on imag (1) 67- 71 F5.2 mag zmag ? Subaru z magnitude (AB, 3" diameter aperture) 73- 76 F4.2 mag e_zmag ? rms uncertainty on zmag (1) 78- 82 F5.2 mag Ymag ? UltraVISTA Y magnitude (AB, 3" diameter aperture) 84- 87 F4.2 mag e_Ymag ? rms uncertainty on Ymag (1) 89- 93 F5.2 mag Jmag ? UltraVISTA J magnitude (AB, 3" diameter aperture) 95- 98 F4.2 mag e_Jmag ? rms uncertainty on Jmag (1) 100-104 F5.2 mag Hmag ? UltraVISTA H magnitude (AB, 3" diameter aperture) 106-109 F4.2 mag e_Hmag ? rms uncertainty on Hmag (1) 111-115 F5.2 mag Ksmag ? UltraVISTA Ks magnitude (AB, 3" diameter aperture) 117-120 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag (1) 122-126 F5.2 mag [3.6] ? IRAC 3.6um magnitude (AB, 3" diameter aperture) 128-131 F4.2 mag e_[3.6] ? rms uncertainty on [3.6] (1) 133-137 F5.2 mag [4.5] ? IRAC 4.5um magnitude (AB, 3" diameter aperture) 139-142 F4.2 mag e_[4.5] ? rms uncertainty on [4.5] (1) 144-148 F5.2 mag F125W ? HST F125W magnitude (AB, 3" diameter aperture) 150-153 F4.2 mag e_F125W ? rms uncertainty on F125W (1) 155-159 F5.2 mag F160W ? HST F160W magnitude (AB, 3" diameter aperture) 161-164 F4.2 mag e_F160W ? rms uncertainty on F160W (1)
Note (1): Errors are the 1σ values, with a minimum adopted error of 0.1mag.
Byte-by-byte Description of file: tablea5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID SCUBA-2 source number 5- 10 F6.4 --- zs ? Optical spectroscopic redshift 12- 15 F4.2 --- zp ? Optical-infrared photometric redshift 16 A1 --- --- [+] 17- 20 F4.2 --- E_zp ? Error on zp (upper value) 21 A1 --- --- [-] 22- 25 F4.2 --- e_zp ? Error on zp (lower value) 27 A1 --- l_zLW Limit flag on zLW 28- 31 F4.2 --- zLW ? Long-wavelength redshift 32 A1 --- --- [+] 33- 36 F4.2 --- E_zLW ? Error on zLW (upper value) 37 A1 --- --- [-] 38- 41 F4.2 --- e_zLW ? Error on zLW (lower value) 43- 47 F5.2 --- r ? Normalized redshift offset r=(zLW-zp)/(1+zp) (see Section 4.2) 49 A1 --- Flag [0/2] Flag indicating the status of the redshift information (1) 51 A1 --- l_z Limit flag on z 52- 55 F4.2 --- z Final adopted redshift 56 A1 --- --- [+] 57- 60 F4.2 --- E_z ? Error on z (upper value) 61 A1 --- --- [-] 62- 65 F4.2 --- e_z ? Error on z (lower value) 67- 71 F5.1 Msun/yr SFR Star formation rate 73- 76 F4.1 Msun/yr e_SFR rms uncertainty on SFR 78- 82 F5.2 Msun M* ? Stellar mass 83 A1 --- --- [+] 84- 87 F4.2 Msun E_M* ? Error on M* (upper value) 88 A1 --- --- [-] 89- 92 F4.2 Msun e_M* ? Error on M* (lower value) 94- 99 A6 --- r_z Source for the spectroscopic redshifts (2)
Note (1): Flag as follows: 0 = source's optical/near-infrared ID was rejected on the basis of an excessive value of r 1 = source accepted 2 = no ID was found For objects flagged with 1 the final redshift z is the optical-infrared photometric redshift zp (or zs if it exists), and therefore a stellar mass can be estimated for the galaxy and is given in the final column. If the flag is 0 or 2, the final adopted redshift z becomes zLW, but no stellar mass can be calculated due to the absence of any optical-infrared photometry. Note (2): These include 11 redshifts from DR1 of the zCOSMOS redshift survey undertaken in the COSMOS field with the VIMOS spectrograph (Lilly et al., 2007, cat. J/ApJS/172/70), 2 redshifts obtained as a part of the 3D-HST observations of the COSMOS field (Brammer et al., 2012ApJS..200...13B; Skelton et al., 2014, Cat. J/ApJS/214/24) and 2 redshifts from the spectroscopic survey undertaken in the COSMOS field with DEIMOS spectrograph (PI: Jehan Kartheltepe).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Feb-2017
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