A SINFONI integral field spectroscopy survey for Galaxy counterparts to damped Lyman-α systems

Details A SINFONI integral field spectroscopy survey for Galaxy counterparts to damped Lyman-α systems A SINFONI integral field spectroscopy survey for Galaxy counterparts to damped Lyman-α systems

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..383p&link_type=abstract

SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-

Astronomy and Astrophysics

Astrophysics

Galaxies: Kinematics And Dynamics, Quasars: Absorption Lines, Quasars: Individual: Q0302$-$223, Q1009$-$0026

Scientific paper

Details of processes through which galaxies convert their gas into stars need to be studied in order to obtain a complete picture of galaxy formation. One way to tackle these phenomena is to relate the H I gas and the stars in galaxies. Here, we present dynamical properties of Damped and sub-Damped Lyman-α Systems identified in H-α emission with VLT/SINFONI at near infra-red wavelengths. While the DLA towards Q0302-223 is found to be dispersion-dominated, the sub-DLA towards Q1009-0026 shows clear signatures of rotation. We use a proxy to circular velocity to estimate the mass of the halo in which the sub-DLA resides and find Mhalo=1012.6 M&sun;. We also derive dynamical masses of these objects, and find Mdyn=1010.3 M&sun; and 1010.9 M&sun;. For one of the two systems (towards Q0302-223), we are able to derive a stellar mass of M*=109.5 M&sun; from Spectral Energy Distribution fit. The gas fraction in this object is 1/3rd, comparable to similar objects at these redshifts. Our work illustrates that detailed studies of quasar absorbers can offer entirely new insights into our knowledge of the interaction between stars and the interstellar gas in galaxies.

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