the z=4.69 radio quiet quasar br 1202-0725 has a 1.25mm flux of 10.5+/-1.5 mjy, an 800 micron flux of 50+/-7 mjy and a 450 micron flux of 92+/-38 mjy. if its far-ir spectrum is similar to that of iras 10214+4724, the ultra high luminosity iras source, then br 1202-0725 has an ir luminosity of the order of 10^14 solar luminosity. this makes it one of the most luminous objects in the universe. a dust model, with dust heated to about 53k (although the exact figure is uncertain), can be fitted to the 450micron - 1.25mm data. from this the fluxes at various ir wavelengths are predicted to be of the order of tens to hundreds of mjy, and the expected turnover in the spectrum to be between 150 to 300 microns. based on its luminosity and the possible dust explanation it is vital to obtain fir fluxes of this object to either confirm or refute the presence of dust and to determine the dust temperature (assuming present). only iso can observe at these wavelengths and has the sensitivity required to reach the predicted flux levels. we also propose to observe two radio loud quasars also detected at 1.25mm. while the aim is to detect any dust present they will also provide an interesting comparison with br 1202-0725.
Instrument
CAM01 , PHT32
Temporal Coverage
1996-02-08T04:25:48Z/1996-07-14T07:33:58Z
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, LEECH et al., 1999, 'IS THERE DUST IN Z > 4 QUASARSquestionMark', 1.0, European Space Agency, https://doi.org/10.5270/esa-j2smk8e
