===================================================================== ==> in this proposal, more time is being requested for kkawara.pq ===================================================================== iso is the first telescape which has potential to detect dust emission from many high-redshift quasars and to provide database for studies of evolution of circumnuclear regions and host galaxies of quasars. once the quantity of dust is established as a function of redshifts, our knowledge of evolution of quasar host galaxies, especially in terms of star-formation history, will greatly advance. such importance led many groups to dedicate massive observing time to observe about 150 quasars in total from z = 0 up to z = 4.9. the dust abundance in high-redshift quasars would result from formation through supernova explosions and destruction by intense radiation from the central source. hence, the luminosity of dust emission relative to the luminosity of the central source should provide an interesting check on other measurements related to star-foramation history of quasar host galaxies. to achieve this goal, we must know the dust abundance as a function of redshifts, or in other words spectral evolution in the infrared has to be established. however, statistics made by using the search tool for the reserved targets lists shows that the quasars reserved for the existing gt (guaranteed time) and ot (open time) programs are not well coordinated to form a sample appropriate for this purpose. the difference in the average absolute b-band magnitude mb for reserved quasars between 0 < z < 1 and 3 < z <5 quasars is a factor of 50 (about 4 mag difference). the real situation is even worse. the reduction of in-flight sensitivities of the pht far-infrared photometry bands sets the detection limit to mb = -29 for quasars at z > 3, thus making the mb difference even greater. suprisingly, there is only one quasar with mb < -29 at z <2. here, we are proposing to add new quasars to the reserved quasars in such a way that this small addition makes the iso quasar database complete in terms of study of spectral evolution.
Instrument
CAM01 , PHT22
Temporal Coverage
1997-01-13T10:15:30Z/1998-01-04T17:11:55Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds 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.
European Space Agency, KAWARA et al., 1999, 'ISO STUDY OF EVOLUTION OF QUASAR SPECTRA SPECTRAL EVOLUTION SEPARATED FROM LUMINOSITY EFFECT', 1.0, European Space Agency, https://doi.org/10.5270/esa-1k421gr
