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The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450-mu m-selected galaxies and their contribution to the cosmic infrared background
- Source :
- Monthly Notices of the Royal Astronomical Society, 432(1), 53-61. Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2013, Vol.432(1), pp.53-61 [Peer Reviewed Journal], Monthly Notices of the Royal Astronomical Society
- Publication Year :
- 2013
-
Abstract
- The first deep blank-field 450um map (1-sigma~1.3mJy) from the SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin^2 of the COSMOS field, in the footprint of the HST CANDELS area. Using 60 submillimetre galaxies (SMGs) detected at >3.75-sigma, we evaluate the number counts of 450um-selected galaxies with flux densities S_450>5mJy. The 8-arcsec JCMT beam and high sensitivity of SCUBA-2 now make it possible to directly resolve a larger fraction of the cosmic infrared background (CIB, peaking at ~200um) into the individual galaxies responsible for its emission than has previously been possible at this wavelength. At S_450>5mJy we resolve (7.4[+/-]0.7)x10^-2 MJy/sr of the CIB at 450um (equivalent to 16[+/-]7% of the absolute brightness measured by COBE at this wavelength) into point sources. A further ~40% of the CIB can be recovered through a statistical stack of 24um emitters in this field, indicating that the majority (~60%) of the CIB at 450um is emitted by galaxies with S_450>2mJy. The average redshift of 450um emitters identified with an optical/near-infrared counterpart is estimated to be =1.3, implying that the galaxies in the sample are in the ultraluminous class (L_IR~1.1x10^12 L_sun). If the galaxies contributing to the statistical stack lie at similar redshifts, then the majority of the CIB at 450um is emitted by galaxies in the LIRG class with L_IR>3.6x10^11 L_sun.<br />9 pages, 5 figures, submitted to MNRAS
- Subjects :
- Absolute magnitude
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Astrophysics::High Energy Astrophysical Phenomena
MU-M
High-redshift
FOS: Physical sciences
HERMES
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
HUBBLE-DEEP-FIELD
Astronomy & Astrophysics
01 natural sciences
Cosmology
STAR-FORMATION
HALF
galaxies: high-redshift
SUBMILLIMETER-SELECTED GALAXIES
Cosmic infrared background
0103 physical sciences
Submillimetre
010303 astronomy & astrophysics
Observations
James Clerk Maxwell Telescope
Astrophysics::Galaxy Astrophysics
Luminous infrared galaxy
Physics
DEGREE EXTRAGALACTIC SURVEY
Science & Technology
COSMIC cancer database
010308 nuclear & particles physics
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy
Astronomy and Astrophysics
DUSTY
Galaxies
Redshift
Galaxy
EVOLUTION
0201 Astronomical And Space Sciences
Space and Planetary Science
cosmology: observations
Physical Sciences
astro-ph.CO
HIGH-REDSHIFT
submillimetre: galaxies
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society, 432(1), 53-61. Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2013, Vol.432(1), pp.53-61 [Peer Reviewed Journal], Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....e9cd812c05f81baf575daa3cc33585d8