Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-07-28
Astronomy and Astrophysics
Astrophysics
12 Pages with Two figures. Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/311603
With an inferred bolometric luminosity of $5\times10^{15}{\rm \lsun}$, the recently identified z=3.87, broad absorption line quasar APM 08279+5255 is apparently the most luminous object currently known. As half of its prodigious emission occurs in the infrared, APM 08279+5255 also represents the most extreme example of an Ultraluminous Infrared Galaxy. Here, we present new submillimeter observations of this phenomenal object; while indicating that a vast quantity of dust is present, these data prove to be incompatible with current models of emission mechanisms and reprocessing in ultraluminous systems. The influence of gravitational lensing upon these models is considered and we find that while the emission from the central continuum emitting region may be significantly enhanced, lensing induced magnification cannot easily reconcile the models with observations. We conclude that further modeling, including the effects of any differential magnification is required to explain the observed emission from APM 08279+5255.
Chapman Scott C.
Ibata Rodrigo A.
Irwin Michael J.
Lewis Geraint F.
Totten Edward J.
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