E. Egami et al. 2000 ApJ 535 561 doi:10.1086/308862
APM 08279+5255: Keck Near- and Mid-Infrared High-Resolution Imaging*
FREEE. Egami1, G. Neugebauer1, B. T. Soifer1, K. Matthews1, M. Ressler2, E. E. Becklin3, T. W. Murphy, Jr.1 and D. A. Dale4
Show affiliationsWe present Keck high-resolution near-IR (2.2 μm; FWHM ~ 0
15) and mid-IR (12.5 μm; FWHM ~ 04) images of APM 08279+5255, a z = 3.91 IR-luminous broad absorption line quasi-stellar object with a prodigious apparent bolometric luminosity of 5 × 1015 L
, the largest known in the universe. The K-band image shows that this system consists of three components, all of which are likely to be the gravitationally lensed images of the same background object, and the 12.5 μm image shows a morphology consistent with such an image configuration. Our lens model suggests that the magnification factor is ~100 from the rest-frame UV to mid-IR, where most of the luminosity is released. The intrinsic bolometric luminosity and IR luminosity of APM 08279+5255 are estimated to be 5 × 1013 L and 1 × 1013 L, respectively. This indicates that APM 08279+5255 is intrinsically luminous, but it is not the most luminous object known. As for its dust contents, little can be determined with the currently available data because of the uncertainties associated with the dust emissivity and the possible effect of differential magnification. We also suggest that the lensing galaxy is likely to be a massive galaxy at z ~ 3.
- Footnote
- Subject headings
gravitational lensing; infrared: galaxies; quasars: individual (APM 08279+5255)
- Dates
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Issue 2 (2000 June 1)
Received 1999 June 10, accepted for publication 2000 January 20
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APM 08279+5255: Keck Near- and Mid-Infrared High-Resolution Imaging
E. Egami et al. 2000 ApJ 535 561
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