Nature of the Cosmic Infrared Background

and

Cosmic Star Formation History:

Are Galaxies Shy ?

29-June-2001


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Author:
Email:
David Elbaz
david.elbaz@cea.fr

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Table of Contents

(I) INTRODUCTION

Title
A Giant Molecular Cloud: Orion
Spectral Energy Distributions of star forming galaxies from UV to radio (M82, Arp 220)
Correlations between MIR and FIR (IRAS)
Correlations between MIR and FIR (ISO/IRAS)
MIR versus Halpha surface brightness in Spiral disks
UV and extinction: beta-slope
Comparison of Star Formation Indicators in the Local Universe (Fig.1 of Cram, Mobasher & Rowan-Robinson, 1998)
Relative Sensitivities to SFR of radio/MIR/sub-mm (template SED of M82 normalized to sensitivity limit for each redshift)

(II) DEEP SURVEYS

MIR (ISOCAM) and sub-mm (SCUBA) deep surveys
15 microns (ISOCAM) integral counts

(III) NATURE OF ISOCAM GALAXIES

Morphologies, colors, masses, L(IR) & SFR of the ISOCAM 15 microns galaxies
Chandra X-ray Observatory (CXO) image of HDFN
CXO optical identifcations
CXO/ISOCAM identifcations
X-ray luminosities and IR-X power index of ISOCAM/CXO galaxies

(IV) OPTICAL+NIR KECK SPECTROSCOPY OF ISOCAM GALAXIES

Slits on optical galaxies
Comparison SFR Halpha and SFR UV (after correction for extinction from Balmer decremenent, Hbeta/Halpha)
Comparison SFR Halpha (corrected) and SFR MIR
Comparison SFR Halpha(corrected)/SFR Halpha(uncorrected) versus SFR Halpha(uncorrected)
HR10: An Extremely Red Object at z= 1.44
HR10: A Distant Clone of Arp 220 at z= 1.44
HR10: model SED
Star formation dependent correction for reddening to reconcile Halpha and FIR in local universe (Hopkins et al. 2001, astro-ph/0103253)
Cosmic IR Background: Origin ?

(V) MODEL FOR COSMIC IR BACKGROUND AND COSMIC STAR FORMATION HISTORY

Number counts in MIR, FIR and Sub-mm: no evolution of the IR luminosity function is ruled out
MIR, FIR, Sub-mm correlations: constraints on template SEDs library
Template SEDs library (Chary & Elbaz 2001)
Luminosity & Density evolution of 15 microns luminosity function: reproduce CIRB
Luminosity & Density evolution of 15 microns luminosity function: reproduce counts, redshift distribution ISOCAM
Cosmic Star Formation History: comparison to other indicators.
Cosmic Star Formation History: when & where did the bulk of present-day stars formed ?

(VI) CONCLUSIONS

CONCLUSIONS