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Deep Galaxy survey at 6.75µm with the ISO satellite

Flores, H., Hammer, F., Désert, F. X., Césarsky, C., Thuan, T., Crampton, D., Eales, Stephen Anthony, Le Fèvre, O., Lilly, S. J., Omont, A. and Elbaz, D. 1999. Deep Galaxy survey at 6.75µm with the ISO satellite. Astronomy & Astrophysics 343 (2) , pp. 389-398.

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Deep 6.75µm mid-IR ISOCAM observations were obtained from the Canada-France Redshift Survey (CFRS) 1415+52 field with the Infrared Space Observatory. The identification of the sources with optical counterparts is described in detail, and a classification scheme is devised which depends on the S/N of the detection and the inverse probability of chance coincidence. 83% of the 54ISOCAMsources are identified with IAB <23.5 counterparts. The (I − K)AB colors, radio properties, spectrophotometric properties and frequency of nuclear activity of these counterparts differ on average from those of typical CFRS galaxies. CFRS spectra are available for 21 of the sources which have IAB _ 22:5 (including 7 stars). Most of the strongest sources are stars or AGN. Among the non– stellar counterparts with spectra, 40% are AGNs, and 53% are galaxies that display star formation activity and/or significant contributions of A stars. The ISOCAM sources also display an IR excess, even when compared with heavily-reddened local starburst galaxies. An upper limit of 30% of extragalactic ISO sources could be atz > 1 of the 44 S6:75µm > 150µJy sources which are non-stellar (7 ”spectroscopic” and 3 ”photometric” stars excluded).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Additional Information: Pdf uploaded in accordance with publisher's policy at (accessed 16/04/2014)
Publisher: EDP Sciences
ISSN: 0004-6361
Related URLs:
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 05:07

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