Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolved nuclear CO(1-0) emission in APM08279+5255: Gravitational
  lensing by a naked cusp?   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.

11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin