Models for Galaxy Evolution Seen by Multiband IR Surveys

Details Models for Galaxy Evolution Seen by Multiband IR Surveys Models for Galaxy Evolution Seen by Multiband IR Surveys

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5406x&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #54.06; Bulletin of the American Astronomical Society, Vol. 33, p.865

Astronomy and Astrophysics

Astronomy

Scientific paper

Empirical `backward' galaxy evolution models are developed for multiband IR surveys. A library consisting of realistic Spectral Energy Distributions (SEDs) of 837 local IR galaxies (IRAS 25μm selected) from the UV (1000Å) to the radio (20cm) is exploited to link coherently the surveys in different wavebands, under the assumption that the local correlation between SEDs and Mid-Infrared (MIR) luminosities can be applied to earlier epochs of the Universe. Assuming a Λ -Cosmology (Ω Λ =0.7, Ω m = 0.3), our best-fit model (`Peak Model') predicts that since z=1.5 the population of starburst galaxies undergo a strong luminosity evolution (L=L0x (1+z)4.2) and also a strong density evolution (ρ =ρ 0x (1+z)2), the normal late-type galaxy population undergoes a passive luminosity evolution (L=L0x (1+z)1.5), and the galaxies with AGNs undergo a luminosity evolution similar to the evolution of optical QSOs (L=L0x (1+z)3.5). Prior at z>=1.5 all evolution rates drop as (1+z)-3. Remarkably, this best-fit model simultaneously fits all data (both number counts and redshift distributions) obtained from all surveys examined here, including optical B band, NIR K band, ISOCAM 15μm , ISOPHOT 90μm , 175μm , IRAS 60μm , SCUBA 850μm , and radio continuum 20cm. Predictions for number counts, confusion limits, redshift distributions, and color-color diagrams are made for multiband surveys using future IR satellites such as SIRTF and Herschel (FIRST).

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