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15 Micron Infrared Space Observatory observations of the 1415+52 Canada-France redshift survey field: the cosmic star formation rate as derived from deep ultraviolet, optical, mid-infrared, and radio photometry

Flores, H., Hammer, F., Thuan, T. X., Cesarsky, C., Desert, F. X., Omont, A., Lilly, S. J., Eales, Stephen Anthony, Crampton, D. and Le Fevre, O. 1999. 15 Micron Infrared Space Observatory observations of the 1415+52 Canada-France redshift survey field: the cosmic star formation rate as derived from deep ultraviolet, optical, mid-infrared, and radio photometry. Astrophysical Journal 517 (1) , pp. 148-167. 10.1086/307172

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Abstract

The Canada-France Redshift Survey 1452+52 field has been deeply imaged with the Infrared Space Observatory using ISOCAM through the LW3 filter (12-18 μm). Careful data analysis and comparison with deep optical and radio data have allowed us to generate a catalog of 78 15 μm sources with both radio and optical identifications. They are redder and lie at higher redshift than I-band-selected galaxies, with most of them being star-forming galaxies. We have considered the galaxies detected at radio and 15 μm wavelengths, which potentially include all strong and heavily extincted starbursts, up to z=1. Spectral energy distributions (SEDs) for each of the sources have been derived using deep radio, mid-IR, near-IR, optical, and UV photometry. The sources were then spectrally classified by comparing with SEDs of well-known nearby galaxies. By deriving their far-IR luminosities by interpolation, we can estimate their star formation rate (SFR) in a way that does not depend sensitively on the extinction. Between 35% and 85% of the star formation at z≤1 is related to IR emission, and the global extinction is in the range AV=0.5-0.85. While heavily extincted starbursts with SFRs in excess of 100 M☉ yr-1 constitute less than 1% of all galaxies, they contribute about 18% of the SFR density out to z=1. Their morphologies range from S0 to Sab, and more than a third are interacting systems. The SFR derived by far-IR fluxes is likely to be ~2.9 times higher than those previously estimated from UV fluxes. The derived stellar mass formed since the redshift of 1 could be too high when compared with the present-day stellar mass density. This might be due to an initial mass function in distant s

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: photometry; galaxies: starburst; galaxies: stellar content; infrared: galaxies
Publisher: IOP Publishing
ISSN: 0004-637X
Last Modified: 04 Jun 2017 05:00
URI: http://orca.cf.ac.uk/id/eprint/47319

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