we propose deep integrations on a selection of three fields which have already been widely studied by the largest spectroscopic survey of faint galaxies available up to date (cfrs). deep imagery/photometry are available in b, v, i and k bands while from 40% to 80% of the i=22.1 galaxies have been spectroscopically measured. moreover one of this field coincides with an ultra deep vla field surveyed down to microjy levels. our aim is to investigate the infrared properties of field galaxies and their evolution, including (1) faint blue galaxies which are crowding the counts and have been recently found to often have seyfert2 like spectra, and (2) normal galaxies up to z=1 which are the dominant population in the visible. we also intend to obtain further constraints on the sed of the microjy radio sources, whose exact nature may be revealed by infrared observations. preliminary work on these ultrafaint radiosources as well as current models are predicting that a relatively large fraction of them are high-z galaxies and agns. in addition to the iso observations, we also plan to follow up our study with near infrared spectroscopy from the ground. we intend to carry out deep observations in 4 wavelength ranges, at 5-8/12-18 microns with isocam and 60/90 microns with isophot. our goal is to get a better understanding of the dust emission in distant normal galaxies as well as in agns and its link with optical and radio emission. several broad band measurements are required to understand the relative influence of hot/cold dust in galaxies as well as to disentangle dust emission from non thermal emissions in agns. we believe that using fields where a considerable amount of work has already been done will put us in a good position to rapidly provide new and fascinating results just after the first iso observations. our fields are small enough to allow the deepest and the most reliable observations with both isocam and i...sophot, and this program will also be used as a template to the deep surveys on blank fields planned in the core program.
Instrument
CAM01 , PHT22 , PHT32
Temporal Coverage
1996-04-29T23:40:40Z/1998-02-12T23:56:42Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
