Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532602p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #326.02; Bulletin of the American Astronomical Society, Vol. 42, p.422
Astronomy and Astrophysics
Astronomy
Scientific paper
The Study of sub-millimetre galaxies brings important constraints about the formation and evolution of galaxies as well as the history of star formation in the Universe. Sub-millimetre observations are very difficult to realize from the ground due to the important opacity of the atmosphere. BLAST (Balloon Borne Large Aperture Telescope) is a telescope mounted on a stratospheric balloon, and was designed to conduct confusion-limited as well as large area galactic and extragalactic observations above most of the atmosphere in three sub-millimetre wavebands centered at 250, 350 and 500 microns. BLAST was flown during 11 days from Antarctica in December 2006 at the altitude of 39 kms and observed a deep (1 square degree) and wide (10 square degrees) blank-field extragalactic survey centered on the Great Observatories Origins Deep Survey South field, with a unique sensitivity and resolution at those wavelengths. The large area combined with the excellent angular resolution and sensitivity has allowed us to detect over 1500 galaxies above 5 sigmas. However, a large fraction of the signal in the maps is composed of the confused emission from thousands of galaxies distributed over a large range of redshifts. We performed a robust statistical analysis of the maps in order to extract the useful information contained in the confused signal. This allowed us to measure number counts at the 3 BLAST wavelengths over more than 2 order of magnitude in flux (from less than 10 mJy up to 1 Jy), and observed a very steep slope of the counts of -3.7 at 250 microns and -4.5 at 350 and 500 microns, suggesting strong evolution of sub-millimetre galaxies. We observed discrepancies with predictions from models at those wavelengths.
Blast Collaboration
Patanchon Guillaume
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