Stellar dynamics of blue compact galaxies: I. Decoupled star-gas kinematics in ESO 400-G43

Details Stellar dynamics of blue compact galaxies: I. Decoupled star-gas kinematics in ESO 400-G43 Stellar dynamics of blue compact galaxies: I. Decoupled star-gas kinematics in ESO 400-G43

2004-04-05

arxiv.org/abs/astro-ph/0404089v1

Astron.Astrophys. 419 (2004) L43-L48

Astronomy and Astrophysics

Astrophysics

To appear in A&A letters

Scientific paper

10.1051/0004-6361:20040139

In this letter we present the first results from a program aimed at measuring the stellar kinematics of blue compact galaxies by observing the near-infrared Calcium triplet. We show the first results for ESO 400-G43 based on deep VLT/FORS2 spectroscopy. The instabilities found in the central gaseous velocity field are not seen in the solid body stellar rotation curve, indicating that stars and gas are kinematically decoupled in this galaxy. Even if this galaxy has a perturbed gaseous velocity field, the stellar velocity dispersion on average agrees well with that derived from the nebular lines.

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