Paschen Alpha Dynamics of Local LBG analogs: A Low-Redshift Test of High-Redshift Assumptions

Details Paschen Alpha Dynamics of Local LBG analogs: A Low-Redshift Test of High-Redshift Assumptions Paschen Alpha Dynamics of Local LBG analogs: A Low-Redshift Test of High-Redshift Assumptions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924619b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #246.19

Astronomy and Astrophysics

Astronomy

Scientific paper

Using integral field data from SINFONI on VLT we measure the Paschen alpha emission in six nearby (mean z=0.16) galaxies with high UV luminosities and surface brightnesses which define them as local analogs of z 3 Lyman Break Galaxies (LBGs). From these data we spatially resolve the distribution and kinematics, velocity and velocity dispersion, of the gas to test if nebular emission lines trace the mass distribution in this galaxy population as is assumed in high redshift studies. Using the method of kinemetry we also characterize the kinematics of the gas and quantify deviations from perfect disk rotation, which allows us to classify each galaxy as a disk- or merger-like system. Future work will include a comparison of the nebular gas properties with that of the molecular gas measured by CO(1-0) emission at comparable spatial resolution to assess the validity of popular but critical assumptions about this galaxy population: that nebular emission lines are reliable kinematic tracers, that gas mass can be inferred from (unobscured) star formation rate and the local Schmidt law, and that the CO-to-H2 conversion factor is the same as that derived in the Milky Way.

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