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 ORCID: https://orcid.org/0000-0002-7394-426X, 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:	24 Oct 2022 11:13
URI:	https://orca.cardiff.ac.uk/id/eprint/47319

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