J/MNRAS/473/1751 Herschel Bright Sources (HerBS) (Bakx+, 2018)
The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations.
Bakx T.J.L.C., Eales S.A., Negrello M., Smith M.W.L., Valiante E.,
Holland W.S., Baes M., Bourne N., Clements D.L., Dannerbauer H.,
De Zotti G., Dunne L., Dye S., Furlanetto C., Ivison R.J., Maddox S.,
Marchetti L., Michalowski M.J., Omont A., Oteo I., Wardlow J.L.,
Van Der Werf P., Yang C.
<Mon. Not. R. Astron. Soc., 473, 1751-1773 (2018)>
=2018MNRAS.473.1751B 2018MNRAS.473.1751B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Photometry, millimetric/submm ; Redshifts
Keywords: gravitational lensing: strong - galaxies: high-redshift -
submillimetre: galaxies
Abstract:
We present the Herschel Bright Sources (HerBS) sample, a sample of
bright, high-redshift Herschel sources detected in the 616.4deg2
Herschel Astrophysical Terahertz Large Area Survey. The HerBS sample
contains 209 galaxies, selected with a 500um flux density greater than
80mJy and an estimated redshift greater than 2. The sample consists
of a combination of hyperluminous infrared galaxies and lensed
ultraluminous infrared galaxies during the epoch of peak cosmic star
formation. In this paper, we present Submillimetre Common-User
Bolometer Array 2 (SCUBA-2) observations at 850um of 189 galaxies of
the HerBS sample, 152 of these sources were detected. We fit a
spectral template to the Herschel-Spectral and Photometric Imaging
Receiver (SPIRE) and 850um SCUBA-2 flux densities of 22 sources with
spectroscopically determined redshifts, using a two-component modified
blackbody spectrum as a template. We find a cold- and hot-dust
temperature of 21.29+1.35-1.66 and 45.80+2.88-3.48K, a
cold-to-hot dust mass ratio of 26.62+5.61-6.74 and a β of
1.83+0.14-0.28. Thee poor quality of the fit suggests that the
sample of galaxies is too diverse to be explained by our simple model.
Comparison of our sample to a galaxy evolution model indicates that
the fraction of lenses are high. Out of the 152 SCUBA-2 detected
galaxies, the model predicts 128.4±2.1 of those galaxies to be
lensed (84.5 per cent). The SPIRE 500um flux suggests that out of all
209 HerBS sources, we expect 158.1±1.7 lensed sources, giving a
total lensing fraction of 76 per cent.
Description:
The sample was selected from the brightest, high-redshift sources in
the H-ATLAS survey, with S500um>80mJy and zphot>2.
We observed 203 sources with the SCUBA-2 array on the JCMT.
We find that 14 detected sources turn out to be blazars, which leaves
our entire HerBS galaxy sample containing 209 sources. 152 of these
sources are detected, 27 sources are not detected due to a
signal-to-noise ratio cut and 10 sources do have a 3σ detection,
but not within the 10-arcsec circle around the SPIRE position.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 117 209 The HerBS sample - SPIRE and SCUBA-2 data
tablea2.dat 105 14 Blazars - SPIRE and SCUBA-2 data
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See also:
J/ApJ/832/78 : HATLAS ultrared galaxies SCUBA-2+LABOCA obs. (Ivison+, 2016)
J/MNRAS/465/3558 : HATLAS candidate lensed galaxies (Negrello+, 2017)
J/A+A/635/A7 : NOEMA redshift of bright Herschel galaxies (Neri+, 2020)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/209] Sequential number within the table
4 A1 --- n_Seq [a] a for sources also in Negrello's sample,
(Negrello, 2017, Cat. J/MNRAS/465/3558)
6- 21 A16 --- H-ATLAS H-ATLAS designation (JHHMMSS.s+DDMMSS)
23- 30 F8.4 deg RAdeg SPIRE Right ascension (J2000)
32- 39 F8.4 deg DEdeg SPIRE Declination (J2000)
41- 46 F6.2 arcsec dRA ?=- SPIRE minus SCUBA-2 right ascension
difference
48- 53 F6.2 arcsec dDE ?=- SPIRE minus SCUBA-2 declination
difference
55- 59 F5.1 mJy S250 Herschel/SPIRE 250um flux
61- 63 F3.1 mJy e_S250 rms uncertainty on S250
65- 69 F5.1 mJy S350 Herschel/SPIRE 350um flux
71- 73 F3.1 mJy e_S350 rms uncertainty on S350
75- 79 F5.1 mJy S500 Herschel/SPIRE 500um flux
81- 84 F4.1 mJy e_S500 rms uncertainty on S500
86- 90 F5.1 mJy S850 ?=- SCUBA-2 850um flux
92- 95 F4.1 mJy e_S850 ?=- rms uncertainty on S850
96 A1 --- n_S850 [b] b: The 850um flux of this source was
re-evaluated
98-101 F4.2 --- zsp ?=- Spectroscopic redshift
103-106 F4.2 --- zpht Template photometric redshift
108-111 F4.2 --- zphIvi Photometric redshift estimates in
Ivison et al. (2016, Cat. J/ApJ/832/78)
113-117 F5.2 [Lsun] logLum Bolometric luminosity
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/14] Sequential number within the table
4- 19 A16 --- H-ATLAS H-ATLAS designation (JHHMMSS.s+DDMMSS)
21- 28 F8.4 deg RAdeg SPIRE Right ascension (J2000)
30- 37 F8.4 deg DEdeg SPIRE Declination (J2000)
39- 43 F5.2 arcsec dRA ?=- SPIRE minus SCUBA-2 right ascension
difference
45- 49 F5.2 arcsec dDE ?=- SPIRE minus SCUBA-2 declination difference
51- 55 F5.1 mJy S250 Herschel/SPIRE 250um flux
57- 59 F3.1 mJy e_S250 rms uncertainty on S250
61- 65 F5.1 mJy S350 Herschel/SPIRE 350um flux
67- 69 F3.1 mJy e_S350 rms uncertainty on S350
71- 75 F5.1 mJy S500 Herschel/SPIRE 500um flux
77- 79 F3.1 mJy e_S500 rms uncertainty on S500
81- 85 F5.1 mJy S850 SCUBA-2 850um flux
87- 90 F4.1 mJy e_S850 rms uncertainty on S850
92- 95 F4.2 --- zsp ?=- Spectroscopic redshift
97-100 F4.2 --- alpha Steepness of the slope of the
synchrotron radiation
102-105 F4.2 --- e_alpha rms uncertainty on alpha
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Aug-2020