= > this proposal requests an upgrade from priority 3 for gdezotti.prop_001, gdezotti.prop_002, gdezotti.prop_003 = the proposals mentioned above (actually three parts of the same proposal), aimed at observing the deep iras survey sample (ids; hacking et al 1987), complete for s(60micron)>50 mjy over an area of 6.25 sq.deg., have been assigned by the otac an observing time of 28800 sec with cam lw3 filter only. this allows to carry out observations of a complete subset of the ids, comprising all sources with s(60micron)>80 mjy (47 sources, leaving aside the pn ngc6543 and the 4 galaxies with good iras fluxes at 12 and 25 microns), plus 9 fainter sources of particular interest: the 4 sources with highest measured redshift (ashby et al. 1996) and 5 optically very faint sources which may be obscured galaxies at significant redshifts. these observations: i) together with iras data, will allow a systematic study of the spectral energy distribution (sed) of a complete, far-ir selected sample, with 72% complete redshift measurements, covering a very interesting redshift range, extending up to, at least, zvirgul0.3, where optical and sub-mjy radio surveys indicate a significant excess of faint blue galaxies; this amounts to a direct look into the far-ir evolution over a look-back time of virgul4gyr (h_0=50, q_0=0.5); the cam lw3 data add an essential point to classify the sources (and, e.g., to check if any of the optically very faint sources has the far-ir colours characteristic of high redshifts), to single out hot objects, possibly hiding obscured agn.s, to get insight into the abundance and physical conditions of dust, to determine bolometric luminosities; ii) provide important complementary information to the deep surveys carried out in the same filter, allowing a... direct estimate of the local luminosity function of galaxies, extending the range in logs over which galaxy counts are estimated and providing a direct link with iras counts.
Instrument
CAM01 , CAM03
Temporal Coverage
1997-02-13T09:06:20Z/1997-02-13T09:49:34Z
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.
