Skip to Main content Skip to Navigation
New interface
Journal articles

Polycyclic aromatic hydrocarbon contribution to the infrared output energy of the universe at Z~2

Abstract : We present an updated phenomenological galaxy evolution model to fit the Spitzer 24, 70, and 160 m number counts, as well as all the previous mid-and far-infrared observations. Only a minor change of the comoving luminosity density distribution in the previous model (Lagache, Dole, & Puget), combined with a slight modification of the starburst template spectra mainly between 12 and 30 m, are required to fit all the data available. We show that the peak in the Spitzer Multiband Imaging Photometer 24 m counts is dominated by galaxies with redshift between 1 and 2, with a nonnegligible contribution from the z ! 2 galaxies ($30% at S ¼ 0:2 mJy). The very close agreement between the model and number counts at 15 and 24 m strikingly implies that (1) the polycyclic aromatic hydrocarbon features remain prominent in the redshift band 0.5–2.5 and (2) the IR energy output has to be dominated by $3 ; 10 11 L to $3 ; 10 12 L galaxies from redshift 0.5 to 2.5. Combining Spitzer with Infrared Space Observatory deep cosmological surveys gives for the first time an unbiased view of the infrared universe from z ¼ 0 to 2.5.
Document type :
Journal articles
Complete list of metadata

Cited literature [18 references]  Display  Hide  Download
Contributor : Administrateur HAL AMU Connect in order to contact the contributor
Submitted on : Monday, July 16, 2018 - 3:08:14 PM
Last modification on : Saturday, June 25, 2022 - 9:11:41 PM
Long-term archiving on: : Wednesday, October 17, 2018 - 2:33:21 PM


Publisher files allowed on an open archive




Guilaine Lagache, H. Dole, J.-L Puget, G. Perez‐gonzalez, E. Le Floc’h, et al.. Polycyclic aromatic hydrocarbon contribution to the infrared output energy of the universe at Z~2. The Astrophysical Journal Supplement, 2004, 154 (1), pp.112 - 117. ⟨10.1086/422392⟩. ⟨hal-01840601⟩



Record views


Files downloads