Astronomy and Astrophysics, volume 552, L12-12 (2013/4-1)
Resolving the molecular gas around the lensed quasar RX J0911.4+0551.
ANH P.T., BOONE F., HOAI D.T., NHUNG P.T., WEISS A., KNEIB J.-P., BEELEN A. and SALOME P.
Abstract (from CDS):
We report on high angular resolution observations of the CO(7-6) line and millimeter continuum in the host galaxy of the gravitationally lensed (z∼2.8) quasar RXJ0911.4+0551
using the Plateau de Bure Interferometer. Our CO observations resolve the molecular disk of the source. Using a lens model based on HST observations, we fit source models to the observed visibilities. We estimate a molecular disk radius of 1±0.2kpc and an inclination of 69±6°, the continuum is more compact and is only marginally resolved by our observations. The relatively low molecular gas mass, Mgas
, and far-infrared (FIR) luminosity, LFIR
, of this quasar could be explained by its relatively low dynamical mass, Mdyn
. It would be a scaled-down version the quasi-stellar objects (QSOs) usually found at high-z. The FIR and CO luminosities lie on the correlation found for QSOs from low to high redshifts and the gas-to-dust ratio (45±17) is similar to the one measured in the z=6.4 QSO, SDSSJ1148+5251
. Differential magnification affects the continuum-to-line luminosity ratio, the line profile, and possibly the spectral energy distribution.
gravitational lensing: strong - Galaxy: evolution - quasars: general - submillimeter: galaxies
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