Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-15
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20066580
We present integral-field spectroscopy of the ionized gas in the central regions of four galaxies with a low surface brightness disk taken with the Visible Multi Object Spectrograph at the Very Large Telescope and aimed at testing the accuracy in the determination of the central logarithmic slope $\alpha$ of the mass density radial profile $\rho(r) \propto r^\alpha$ in this class of objects. For all the sample galaxies we subtracted from the observed velocity field the best-fit model of gas in circular motions and derived the residuals. Only ESO-LV 5340200 is characterized by a regular velocity field. We extracted the velocity curves of this galaxy along several position angles, in order to estimate the uncertainty in deriving the central gradient of the total mass density from long-slit spectroscopy. We report the detection of strong non-ordered motions of the ionized gas in three out of four sample galaxies. The deviations have velocity amplitudes and spatial scales that make not possible to disentangle between cuspy and core density radial profiles.
Bertola Francesco
Corsini Enrico Maria
Pizzella Alessandro
Tamburro D.
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