Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26r.193m&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the preliminary kinematics results for the galaxies NGC 2613, NGC 3521 y M83. These galaxies are part of a sample of spiral galaxies observed from CASLEO with the aim of studying the kinematics of the stellar component and its relation with the observed peculiarities in the gas kinematics. We present the spatial distribution and dispersion of the stellar radial velocities, obtained from long slit spectra in the Calcium Triplet (CaT) absorption lines. In the M83 and NGC 2613 cases, we compared these distributions with the gaseous kinematics. The main new result obtained for M83, is that the gaseous component is co-rotating with the stellar component in the circumnuclear region, despite the strong departures from axisymmetry in the central region of the galaxy (Mast et al. 2006, AJ, 131, 1394). For NGC 2613 the enclosed mass within 2\cdot^ arcsec5 radius is 1.8×10^9 M&sun;. The gaseous phase velocity gradient for the inner 14 arcsec is 24km sec^{-1}arcsec^{-1} against 8 km sec{^-1}arcsec{^-1} for the stars in the same radius. In order to estimate the enclosed mass inside r = 10 kpc, we adjust a two component Miyamoto-Nagai potential (bulge + disk), obtaining for the global disk component a mass of 2.4×10^{11} M&sun;, while for the bulge component we obtained 2×10^9 M&sun;, in accordance with the central radial dispersion velocity determination.
Diaz Ruben J.
Mast Damian
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