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Resolved nuclear CO(1-0) emission in APM08279+5255: Gravitational lensing by a naked cusp?

Geraint F. Lewis·Chris Carilli·Padeli Papadopoulos·R. J. Ivison
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Abstract

The ultraluminous broad absorption line quasar APM08279+5255 is one of the most luminous systems known. Here, we present an analysis of its nuclear CO(1-0) emission. Its extended distribution suggests that the gravitational lens in this system is highly elliptical, probably a highly inclined disk. The quasar core, however, lies in the vicinity of naked cusp, indicating that APM08279+5255 is truly the only odd-image gravitational lens. This source is the second system for which the gravitational lens can be used to study structure on sub-kpc scales in the molecular gas associated with the AGN host galaxy. The observations and lens model require CO distributed on a scale of $\sim 400$ pc. Using this scale, we find that the molecular gas mass makes a significant, and perhaps dominant, contribution to the total mass within a couple hundred parsecs of the nucleus of APM08279+5255.

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Geraint F. Lewis, Chris Carilli, Padeli Papadopoulos, R. J. Ivison. 2001-12-12. Resolved nuclear CO(1-0) emission in APM08279+5255: Gravitational lensing by a naked cusp?. https://doi.org/10.1046/j.1365-8711.2002.05260.x

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