Abstract / Description of output
We report on a search for the optical counterparts of 175-μm selected
sources from the Far-Infrared Background (FIRBACK) survey in the
European Large Area ISO Survey (ELAIS) N2 field. Applying a likelihood
ratio technique to optical catalogues from the Isaac Newton Telescope -
Wide Field Survey (INT-WFS), we found optical identifications for 33 out
of 55 FIRBACK sources in this field. These were then reassessed in the
light of associations with the ELAIS final catalogue for the N2 field,
to yield a final set of 31 associations. We have investigated the nature
of this population through a comparison of their observed spectral
energy distributions (SEDs) with predictions from radiative transfer
models which simulate the emission from both cirrus and starburst
components. We find the far-infrared sources to be 80 per cent starburst
galaxies with their starburst component at a high optical depth. The
resulting SEDs were used to estimate far-infrared luminosities, star
formation rates (SFRs), dust temperatures and dust masses. The N2
FIRBACK population is found to consist of four suspected ultraluminous
infrared galaxies (ULIRGs) with LFIR~
1012Lsolar and SFRFIR >
100Msolaryr-1, a number of luminous infrared
galaxies (LIRGs) with moderate star formation rates and LFIR~
1011Lsolar and a population of low-redshift
quiescently star-forming galaxies. We also discuss the implications of
these results for current evolutionary models.
Original language | English |
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Pages (from-to) | 1352-1374 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 361 |
Publication status | Published - 1 Aug 2005 |
Keywords / Materials (for Non-textual outputs)
- galaxies: starburst
- infrared: galaxies
- surveys
- galaxies: fundamental parameters
- galaxies: evolution