J/MNRAS/477/1099 SCUBA-2 850um obs. of Herschel gal. (Duivenvoorden+, 2018)
Red, redder, reddest: SCUBA-2 imaging of colour-selected Herschel sources.
Duivenvoorden S., Oliver S., Scudder J.M., Greenslade J., Riechers D.A.,
Wilkins S.M., Buat V., Chapman S.C., Clements D.L., Cooray A.,
Coppin K.E.K., Dannerbauer H., De Zotti G., Dunlop J.S., Eales S.A.,
Efstathiou A., Farrah D., Geach J.E., Holland W.S., Hurley P.D.,
Ivison R.J., Marchetti L., Petitpas G., Sargent M.T., Scott D.,
Symeonidis M., Vaccari M., Vieira J.D., Wang L., Wardlow J., Zemcov M.
<Mon. Not. R. Astron. Soc., 477, 1099-1119 (2018)>
=2018MNRAS.477.1099D 2018MNRAS.477.1099D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR; Photometry, millimetric/submm; Redshifts
Keywords: galaxies: high-redshift; galaxies: starburst; Infrared: galaxies;
submillimetre: galaxies
Abstract:
High-redshift, luminous, dusty star-forming galaxies (DSFGs) constrain
the extremity of galaxy formation theories. The most extreme are
discovered through follow-up on candidates in large area surveys.
Here, we present extensive 850um SCUBA-2 follow-up observations of 188
red DSFG candidates from the Herschel Multitiered Extragalactic Survey
(HerMES) Large Mode Survey, covering 274deg2. We detected 87% with a
signal-to-noise ratio >3 at 850um. We introduce a new method for
incorporating the confusion noise in our spectral energy distribution
fitting by sampling correlated flux density fluctuations from a
confusion limited map. The new 850um data provide a better constraint
on the photometric redshifts of the candidates, with photometric
redshift errors decreasing from σz/(1+z)∼0.21 to 0.15.
Comparison spectroscopic redshifts also found little bias
(<(z-zspec)/(1+zspec)≥0.08). The mean photometric redshift is
found to be 3.6 with a dispersion of 0.4 and we identify 21 DSFGs with
a high probability of lying at z>4. After simulating our selection
effects we find number counts are consistent with phenomenological
galaxy evolution models. There is a statistically significant excess
of WISE-1 and SDSS sources near our red galaxies, giving a strong
indication that lensing may explain some of the apparently extreme
objects. Nevertheless, our sample includes examples of galaxies with
the highest star formation rates in the Universe (≫103M☉/yr).
Description:
We selected the 200 brightest galaxies i.e. S500>63mJy, of the 477
Asboth+ (2016, J/MNRAS/462/1989) sources, and we observed a random
sub-set of 188 of them for 15min each using the DAISY pattern with the
SCUBA-2 camera at the JCMT. The observations were taken in semester
15B between 2015 July 31 and 2015 November 15 with an opacity at
225GHz between 0.05 and 0.12.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 107 188 Flux densities with instrumental errors,
redshifts, and luminosities of our targets
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+, 1998)
VIII/103 : Herschel Multi-tiered Extragalactic Survey (HerMES+, 2012)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
V/139 : The SDSS Photometric Catalog, Release 9 (Ahn, 2012)
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
J/MNRAS/372/1621 : SCUBA Half-Degree Extragalactic Survey. II (Coppin+, 2006)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/MNRAS/380/199 : SCUBA Half-Degree Extragalactic Survey. III (Ivison+, 2007)
J/ApJ/707/1201 : LABOCA ECDFS Submillimeter Survey (LESS) (Weiss+, 2009)
J/MNRAS/411/505 : Sub-mm observations in Extended Chandra DFS (Chapin+, 2011)
J/ApJ/761/140 : Spectroscopy of Herschel-SPIRE galaxies (Casey+, 2012)
J/A+A/551/A100 : Panchromatic SED of Herschel sources (Berta+, 2013)
J/MNRAS/429/3047 : Observational parameters of SMGs programme (Bothwell+, 2013)
J/ApJ/768/91 : ALMA observations of LESS submm galaxies (Hodge+, 2013)
J/ApJ/812/43 : ALMA 870um obs. of HerMES galaxies (Bussmann+, 2015)
J/MNRAS/462/1989 : HerMES Large Mode Survey catalogue (Asboth+, 2016)
J/ApJ/832/78 : SCUBA-2 & LABOCA obs. of HATLAS galaxies (Ivison+, 2016)
J/MNRAS/465/1789 : SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)
J/MNRAS/465/3558 : HATLAS candidate lensed galaxies (Negrello+, 2017)
J/A+A/614/A33 : 500µm-risers sources (Donevski+, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [HerMES]
8- 23 A16 --- HerMES HerMES source name (JHHMMSS.s+DDMMSS)
25- 37 A13 --- ID HELMS_RED number
from Asboth+, 2016, J/MNRAS/462/1989
(<[ACS2016] HELMS RED NNN> for Simbad)
39- 43 F5.1 mJy S250 [18/141] Herschel/SPIRE 250um flux density
45- 47 F3.1 mJy e_S250 [5/8] S250 uncertainty
49- 53 F5.1 mJy S350 [31/167] Herschel/SPIRE 350um flux density
55- 57 F3.1 mJy e_S350 [5/7] S350 uncertainty
59- 63 F5.1 mJy S500 [63/192] Herschel/SPIRE 250um flux density
65- 67 F3.1 mJy e_S500 [6/9] S500 uncertainty
69- 72 F4.1 mJy S850 [6/83] SCUBA-2 850um flux density
74- 76 F3.1 mJy e_S850 [3/7] S850 uncertainty
78- 81 F4.2 --- zphot [2.8/5.2] Photometric redshift
83- 86 F4.2 --- E_zphot [0.5/1] Positive uncertainty on zphot
88- 91 F4.2 --- e_zphot [0.5/1] Negative uncertainty on zphot
93- 97 F5.2 [Lsun] logLfir [13/14] log of FIR luminosity
99-102 F4.2 [Lsun] E_logLfir [0.07/0.2] Positive uncertainty on logLfir
104-107 F4.2 [Lsun] e_logLfir [0.09/0.3] Negative uncertainty on logLfir
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 15-Apr-2020