The nature of the galaxies responsible for the excess in the 15 μm number counts

Details The nature of the galaxies responsible for the excess in the 15 μm number counts The nature of the galaxies responsible for the excess in the 15 μm number counts

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427.1023a&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 1023

Computer Science

11

Cosmology, Number Counts, Galaxy : Evolution

Scientific paper

We have used a complete flux limited sample of sources detected at 15 μm in the Hubble Deep Field area to investigate the mid-infrared, optical and spectroscopic properties of the galaxies responsible for the excess in the number counts at this wavelength. We show that these galaxies are large spirals and irregular or merging systems, with colors typical of normal spiral. We estimate their mid-infrared luminosity and show that they are of the order of local ULIRGs. Using the 15 μm luminosity as an indicator of star formation, we show that the classical [OII] tracer is extincted in these galaxies. Finally, we discuss the implication of our results on

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