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We have mapped the molecular gas content in the host galaxy of the stronglylensed high redshift quasar APM 08279+5255 (z=3.911) with the Very Large Arrayat 0.3" resolution. The CO(J=1-0) emission is clearly resolved in our maps. TheCO(J=1-0) line luminosity derived from these maps is in good agreement with aprevious single-dish measurement. In contrast to previous interferometer-basedstudies, we find that the full molecular gas reservoir is situated in twocompact peaks separated by <~0.4". Our observations reveal, for the first time,that the emission from cold molecular gas is virtually cospatial with theoptical/near-infrared continuum emission of the central AGN in this source.This striking similarity in morphology indicates that the molecular gas issituated in a compact region close to the AGN. Based on the high resolution COmaps, we present a revised model for the gravitational lensing in this system,which indicates that the molecular gas emission is magnified by only a factorof 4 (in contrast to previously suggested factors of 100). This model suggeststhat the CO is situated in a circumnuclear disk of ~550 pc radius that ispossibly seen at an inclination of <~25 deg, i.e., relatively close to face-on.  From the CO luminosity, we derive a molecular gas mass of M_gas=1.3x10^11M_sun for this galaxy. From the CO structure and linewidth, we derive adynamical mass of M_dyn(sin i)^2=4.0x10^10 M_sun. Based on a revised massestimate for the central black hole of M_BH=2.3x10^10 M_sun and the results ofour molecular line study, we find that the mass of the stellar bulge of APM08279+5255 falls short of the local M_BH-sigma_bulge relationship of nearbygalaxies by more than an order of magnitude, lending support to recentsuggestions that this relation may evolve with cosmic time and/or change towardthe high mass end.

astrophysical journal/the astrophysical journal

Imaging the Molecular Gas in a z=3.9 Quasar Host Galaxy at 0.3"  Resolution: A Central, Sub-Kiloparsec Scale Star Formation Reservoir in APM  08279+5255