Richard Gispert

Publications (5)1.69 Total impact

• Chapter: Implications of the Cosmic Infrared Background for the Redshift Distribution of Infrared Galaxies

  Jean-Loup Puget, Guilaine Lagache, Richard Gispert
  [show abstract] [hide abstract]
  ABSTRACT: The cosmic infrared background detected in the COBE data contains a surprisingly large fraction of the cosmic background due to distant galaxies. The spectrum of this background decreases at long wavelength with a slope much less steep than the one observed for individual infrared galaxies. Considering the variety of long wavelengths spectra observed for these galaxies we have explored the range of possible redshift evolution histories for these galaxies. We show that only a comoving production rate of far infrared radiation with strong evolution at low redshifts but little evolution between redshifts 1.5 and 3.5 is allowed by the cosmic background spectrum. The detailed low redshift evolution is much better constrained by the ISO deep surveys than by the background.
  01/2008: pages 136-140;
• Source

  Available from: François R. Bouchet

  Article: FIRBACK: III. Catalog, Source counts, and cosmological implications of the 170 micron ISO Deep survey

  Herve Dole, Richard Gispert, Guilaine Lagache, Jean-Loup Puget, F. R. Bouchet, C. Cesarsky, P. Ciliegi, D. L. Clements, M. Dennefeld, F. X. Desert, D. Elbaz, A. Franceschini, B. Guiderdoni, M. Harwit, D. Lemke, A. F. M. Moorwood, S. Oliver, W. T. Reach, M. Rowan-Robinson, M. Stickel
  [show abstract] [hide abstract]
  ABSTRACT: The FIRBACK (Far Infrared BACKground) survey is one of the deepest imaging surveys carried out at 170 microns with ISOPHOT onboard ISO, and is aimed at the study of the structure of the Cosmic Far Infrared Background. This paper provides the analysis of resolved sources. After a validated process of data reduction and calibration, we perform intensive simulations to optimize the source extraction, measure the confusion noise (sigma_c = 45 mJy), and give the photometric and astrometric accuracies. 196 galaxies with flux S > 3 sigma_c are detected in the area of 3.89 square degrees. Counts of sources with flux S > 4 sigma_c present a steep slope of 3.3 +/- 0.6 on a differential "logN-logS" plot between 180 and 500 mJy. As a consequence, the confusion level is high and will impact dramatically on future IR deep surveys. This strong evolution, compared with a slope of 2.5 from Euclidian geometry, is in line with models implying a strongly evolving Luminous Infrared Galaxy population. The resolved sources account for less than 10% of the Cosmic Infrared Background at 170 microns, which is expected to be resolved into sources in the 1 to 10 mJy range. Comment: Accepted for publication in A&A. 16 pages, includes new aa.cls. Tables 7 to 13 included here will appear on the electronic version of A&A and at the CDS. Paper, catalog and images (with better quality) also available at http://wwwfirback.ias.u-psud.fr and http://mips.as.arizona.edu/~hdole/firback
  03/2001;
• Source

  Available from: François R. Bouchet

  Article: FIRBACK Source Counts and Cosmological Implications

  Herve Dole, Richard Gispert, Guilaine Lagache, Jean-Loup Puget, H. Aussel, F. R. Bouchet, P. Ciliegi, D. L. Clements, C. J. Cesarsky, F. X. Desert, [......], B. Guiderdoni, M. Harwit, R. Laureijs, D. Lemke, R. McMahon, A. F. M. Moorwood, S. Oliver, W. T. Reach, M. Rowan-Robinson, M. Stickel
  [show abstract] [hide abstract]
  ABSTRACT: FIRBACK is a one of the deepest surveys performed at 170 microns with ISOPHOT onboard ISO, and is aimed at the study of cosmic far infrared background sources. About 300 galaxies are detected in an area of four square degrees, and source counts present a strong slope of 2.2 on an integral "logN-logS" plot, which cannot be due to cosmological evolution if no K-correction is present. The resolved sources account for less than 10% of the Cosmic Infrared Background at 170 microns. In order to understand the nature of the sources contributing to the CIB, and to explain deep source counts at other wavelengths, we have developed a phenomenological model, which constrains in a simple way the luminosity function evolution with redshift, and fits all the existing deep source counts from the mid-infrared to the submillimetre range. Images, materials and papers available on the FIRBACK web: http://wwwfirback.ias.u-psud.fr wwwfirback.ias.u-psud.fr Comment: proceedings of "ISO Surveys of a Dusty Universe", eds. D. Lemke, M. Stickel, K. Wilke, Ringberg, 8-12 Nov 1999, to appear in Springer 'Lecture Notes of Physics'. 8 pages, 7 eps figures, .sty included
  02/2000;
• Article: The Submillimeter Extragalactic Background and its Implication for the Star Formation History of the Universe

  Guilaine Lagache, Jean-Loup Puget, Richard Gispert
  [show abstract] [hide abstract]
  ABSTRACT: The recently discovered Submillimeter Extragalactic Background (submm EB) has opened new perspectives on our understanding of galaxy evolution. We detail in this paper one of the major cosmological consequences of this discovery, the submm luminosity density history of the Universe.
  Astrophysics and Space Science 11/1999; 269-270:263-266. · 1.69 Impact Factor
• Source

  Available from: François R. Bouchet

  Article: FIRBACK Far Infrared Survey with ISO: Data Reduction, Analysis and First Results

  Herve Dole, Guilaine Lagache, Jean-Loup Puget, Richard Gispert, H. Aussel, F. R. Bouchet, C. Ciliegi, D. L. Clements, C. Cesarsky, F. X. Desert, [......], B. Guiderdoni, M. Harwit, R. Laureijs, D. Lemke, R. McMahon, A. F. M. Moorwood, S. Oliver, W. T. Reach, M. Rowan-Robinson, M. Stickel
  [show abstract] [hide abstract]
  ABSTRACT: FIRBACK is one of the deepest cosmological surveys performed in the far infrared, using ISOPHOT. We describe this survey, its data reduction and analysis. We present the maps of fields at 175 microns. We point out some first results: source identifications with radio and mid infrared, and source counts at 175 microns. These two results suggest that half of the FIRBACK sources are probably at redshifts greater than 1. We also present briefly the large follow-up program.
  03/1999;