in order to measure the thermal emission from high-redshift z > 3 qsos, we are proposing to do photometry by using isocam and pht-c at the lw2 (6.7 um), lw10 (11.5 um) c_90 (90 um), and c_160 (160 um) band. from this observation, the mass of dust in a circumnuclear region and a disk could be estimated. if the formation of galaxies took more than 1 gyr as suggested by a star formation rate measured in several high-redshift radio-quiet galaxies, galaxies were still forming at z = 4. hence, it is natural to search for the thermal mission from dust in high-redshift (young) qsos, and the mass of dust would provide a clue to star formation at high redshifts where dust formed through supernovae and destryed by shocks and intense radiation. our primary goal is to detect qsos at the lw2 (1.3 um in the rest frame at z =4) and c_90 (18 um at z = 4) bands. the c_90/lw2 luminosity ratio will be used as an index of emission from dust. the sample consists of 27 - 30 qsos with z > 3 (27 qsos for spring and 30 qsos for autumn). most of them are optically selected, ne_8band so probably radio-quiet qsos, the infrared continuum of which would be dominated by the thermal emission from dust as in the case of low-redshift pg qsos.
Instrument
CAM01 , PHT22
Temporal Coverage
1996-05-04T10:55:58Z/1998-01-07T03:15:16Z
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.
