puget99

FIRBACK. I. A deep survey at 175 microns with ISO, preliminary results
J. L. Puget, G. Lagache, D. L. Clements, W. T. Reach, H. Aussel, F. R. Bouchet, C. Cesarsky, F. X. Désert, H. Dole, D. Elbaz, A. Franceschini, B. Guiderdoni, A. F. M. Moorwood;
AaA, 1999, 345, 29

ABSTRACT:FIRBACK is a deep survey conducted with the ISOPHOT instrument aboard the Infrared Space Observatory (ISO) at an effective wavelength of 175 mu m. We present here results we have obtained on the first field, the so-called Marano1 which covers around 0.25 square degree. We find that the source density for objects with a flux above 200 mJy exceeds the counts expected for sources found in the IRAS deep surveys with a similar flux by about an order of magnitude. Such an excess was expected on the basis of the high far infrared background detected with the FIRAS and DIRBE instruments aboard the Cosmic Background Explorer (COBE). These sources are likely to be redshifted infrared galaxies. The steep number counts indicate strong cosmological evolution in this population. The detected sources account for only 10 % of the cosmic IR background. An extrapolation of the counts down to about 10 mJy would be needeed to account for the whole background at this wavelength.
KEYWORDS: cosmology: observations, infrared: galaxies, surveys, galaxies: evolution, galaxies: ism
CODE: puget99

FIRBACK. I. A deep survey at 175 microns with ISO, preliminary results J. L. Puget, G. Lagache, D. L. Clements, W. T. Reach, H. Aussel, F. R. Bouchet, C. Cesarsky, F. X. Désert, H. Dole, D. Elbaz, A. Franceschini, B. Guiderdoni, A. F. M. Moorwood; AaA, 1999, 345, 29

FIRBACK. I. A deep survey at 175 microns with ISO, preliminary results
J. L. Puget, G. Lagache, D. L. Clements, W. T. Reach, H. Aussel, F. R. Bouchet, C. Cesarsky, F. X. Désert, H. Dole, D. Elbaz, A. Franceschini, B. Guiderdoni, A. F. M. Moorwood;
AaA, 1999, 345, 29