Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-28
Mon.Not.Roy.Astron.Soc. 357 (2005) 165-173
Astronomy and Astrophysics
Astrophysics
8 pages, 10 figures. Accepted version for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08624.x
We present a photometric selection method for ULIRGs in the redshift range of z=1 -- 2. We utilize the most prominent spectral feature of ULIRGs, i.e. the silicate absorption feature at 9.7 micron and an optimized filter system at mid-infrared wavelengths. These `silicate-break' galaxies could be selected by using colour anomalies owing to the silicate absorption feature around 9.7(1+z) micron. Such filter systems are available on the Spitzer Space Telescope but we suggest that the most promising selection criteria would be given with mid-infrared bands of ASTRO-F satellite due to a more comprehensive set of filter bands than that of Spitzer. We study the selection method of silicate-break galaxies with the SED model of both starbursts and quiescent star-forming galaxies, and then verify the method by using the observed spectra of nearby galaxies. We would expect that about 1000 candidates of silicate-break galaxies could be detected per square degree in current and future mid-infrared surveys. The silicate-break selection criteria will break the degeneracy between various galaxy evolution models for extragalactic source counts and place strong limits on the star formation activity at z=1 -- 2. Applying our silicate-break technique to initial Spitzer results we have tentatively identified the first candidate silicate-break galaxy at z=1.6.
Pearson Chris P.
Takagi Taichiro
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