Molecular gas rich galaxy pair unveiled in the lensed quasar 0957+561

Details Molecular gas rich galaxy pair unveiled in the lensed quasar 0957+561 Molecular gas rich galaxy pair unveiled in the lensed quasar 0957+561

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..346p&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

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Gravitational lenses have recently become a powerful tool for probing the molecular gas content in galaxies at high redshift (z>1). Magnification of the emitted spectral lines by a gravitational lens has helped to make the molecular gas emission detectable in most cases. However, the emission has not been resolved in any object. We observed the CO 2rightarrow1 emission of the twin quasar 0957+561 using the IRAM Plateau de Bure interferometer. Molecular gas in the host galaxy of this lensed quasar has been detected at the redshift of 1.414. This detection shows the extended nature of the molecular gas distribution in the host galaxy and the pronounced lensing effects due to the differentially magnified CO emission at different velocities. The molecular gas mass is 2-6 × 109 Modot and it is distributed in a disk that is several kiloparsecs in diameter. A second, weaker component of CO is interpreted as arising from a close companion galaxy, that is moving at a velocity 660 km s-1 higher than the host galaxy. Our results show that radio spectroscopy of molecular lines with high-angular and high-velocity resolution of lensed galaxies at cosmological distances is able to trace the extended distribution and the kinematics of the molecular gas.

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