J/MNRAS/465/1789 SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)
The SCUBA-2 Cosmology Legacy Survey:
850 µm maps, catalogues and number counts.
Geach J.E., Dunlop J.S., Halpern M., Smail I., van der Werf P.,
Alexander D.M., Almaini O., Aretxaga I., Arumugam V., Asboth V.,
Banerji M., Beanlands J., Best P.N., Blain A.W., Birkinshaw M.,
Chapin E.L., Chapman S.C., Chen C.-C., Chrysostomou A., Clarke C.,
Clements D.L., Conselice C., Coppin K.E.K., Cowley W.I., Danielson A.L.R.,
Eales S., Edge A.C., Farrah D., Gibb A., Harrison C.M., Hine N.K.,
Hughes D., Ivison R.J., Jarvis M., Jenness T., Jones S.F., Karim A.,
Koprowski M., Knudsen K.K., Lacey C.G., Mackenzie T., Marsden G.,
McAlpine K., McMahon R., Meijerink R., Michalowski M.J., Oliver S.J.,
Page M.J., Peacock J.A., Rigopoulou D., Robson E.I., Roseboom I.,
Rotermund K., Scott D., Serjeant S., Simpson C., Simpson J.M.,
Smith D.J.B., Spaans M., Stanley F., Stevens J.A., Swinbank A.M.,
Targett T., Thomson A.P., Valiante E., Wake D.A., Webb T.M.A., Willott C.,
Zavala J.A., Zemcov M.
<Mon. Not. R. Astron. Soc., 465, 1789-1806 (2017)>
=2017MNRAS.465.1789G 2017MNRAS.465.1789G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Photometry, millimetric/submm
Keywords: catalogues - surveys - galaxies: evolution - galaxies: high-redshift -
cosmology: observations
Abstract:
We present a catalogue of ∼3000 submillimetre sources detected
(≥3.5σ) at 850um over ∼5deg2 surveyed as part of the James
Clerk Maxwell Telescope (JCMT) SCUBA-2 Cosmology Legacy Survey
(S2CLS). This is the largest survey of its kind at 850um, increasing
the sample size of 850um selected submillimetre galaxies by an order
of magnitude. The wide 850um survey component of S2CLS covers the
extragalactic fields: UKIDSS-UDS, COSMOS, Akari-NEP, Extended Groth
Strip, Lockman Hole North, SSA22 and GOODS-North. The average 1σ
depth of S2CLS is 1.2mJy/beam, approaching the SCUBA-2 850um
confusion limit, which we determine to be σc~=0.8mJy/beam. We
measure the 850um number counts, reducing the Poisson errors on the
differential counts to approximately 4 per cent at S850~=3mJy. With
several independent fields, we investigate field-to-field variance,
finding that the number counts on 0.5°-1° scales are
generally within 50 per cent of the S2CLS mean for S850>3mJy, with
scatter consistent with the Poisson and estimated cosmic variance
uncertainties, although there is a marginal (2σ) density
enhancement in GOODS-North. The observed counts are in reasonable
agreement with recent phenomenological and semi-analytic models,
although determining the shape of the faint-end slope (S850<3mJy)
remains a key test. The large solid angle of S2CLS allows us to
measure the bright-end counts: at S850>10mJy there are approximately
10 sources per square degree, and we detect the distinctive up-turn in
the number counts indicative of the detection of local sources of
850um emission, and strongly lensed high-redshift galaxies. All
calibrated maps and the catalogue are made publicly available at
https://zenodo.org/record/57792#.W41TsRg68eM .
Description:
The S2CLS survey has two tiers: wide and deep. The wide tier covers
several well-explored extragalactic survey fields: Akari-Northern
Ecliptic Pole, COSMOS, Extended Groth Strip, GOODS-North, Lockman Hole
North, SSA22 and UKIDSS-UDS, mapping at 850um during conditions where
the zenith optical depth at 225GHz was 0.05<τ225≤0.1 and field
elevations exceeded 30°. In the deep tier, several deep 'keyhole'
regions within the wide fields were mapped when τ225≤0.05,
conditions suitable for obtaining 450um maps which require the
lowest opacities (Geach et al., 2013MNRAS.432...53G 2013MNRAS.432...53G). Note that
SCUBA-2 simultaneously records 450um and 850um photons, and while the
complementary 450um data exist for the wide 850um maps we present
here, they have not been processed, since they are not expected to be
of sufficient quality given the observing conditions. In this paper,
we present the maps and catalogue from the wide tier only.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
s2clsdr1.dat 142 2851 S2CLS catalogue
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See also:
https://zenodo.org/record/57792#.W41TsRg68eM : The SCUBA-2 Cosmology Legacy
Survey Home Page
Byte-by-byte Description of file: s2clsdr1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- S2CLS IAU compliant coordinate-based catalogue
name (S2CLSJHHMMSS+DDMMSS)
21- 28 A8 --- SName Short source name of the format field.XXXX,
where XXXX is a catalogue index (FFF.NNNN)
30- 31 I2 h RAh Right Ascension of source from the peak SNR
pixel in sexagesimal format (J2000)
33- 34 I2 min RAm Right Ascension of source from the peak SNR
pixel in sexagesimal format (J2000)
36- 40 F5.2 s RAs Right Ascension of source from the peak SNR
pixel in sexagesimal format (J2000)
42 A1 --- DE- Declination sign of source from the peak
SNR pixel in sexagesimal format (J2000)
43- 44 I2 deg DEd Declination of source from the peak SNR
pixel in sexagesimal format (J2000)
46- 47 I2 arcmin DEm Declination of source from the peak SNR
pixel in sexagesimal format (J2000)
49- 52 F4.1 arcsec DEs Declination of source from the peak SNR
pixel in sexagesimal format (J2000)
54- 63 F10.6 deg RAdeg Right Ascension of source from the peak SNR
pixel in decimal degrees (J2000)
65- 74 F10.6 deg DEdeg Declination of source from the peak SNR
pixel in decimal degrees (J2000)
76- 84 F9.5 mJy/beam S850 Flux density measured at peak SNR pixel
86- 92 F7.5 mJy/beam e_S850 Instrumental noise measured at peak SNR
pixel
94-102 F9.5 --- S/N Signal-to-noise ratio defined as
S850/e_S850
104-112 F9.5 mJy/beam S850d Deboosted flux density
114-120 F7.5 mJy/beam e_S850d Uncertainty on deboosted flux density
122-130 F9.7 --- Compl Completeness rate for this source based on
recovery simulation
132-142 F11.6 [-] logFDR logarithmic probability that source is a
false positive
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History:
Copied at https://zenodo.org/record/57792#.W41TsRg68eM
(End) Patricia Vannier [CDS] 03-Sep-2018