Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-04
Astrophys.J. 575 (2002) 801-813
Astronomy and Astrophysics
Astrophysics
Accepted for Publication in ApJ with minor changes required
Scientific paper
10.1086/341475
We present high resolution Halpha rotation curves of 4 late-type dwarf galaxies and 2 low surface brightness galaxies (LSB) for which accurate HI rotation curves are available from the literature. Observations are carried out at Telescopio Nazionale Galileo (TNG). For LSB F583-1 an innovative dispersing element was used, the Volume Phase Holographic (VPH) with a dispersion of about 0.35 A/pxl. We find good agreement between the Halpha data and the HI observations and conclude that the HI data for these galaxies suffer very little from beam smearing. We show that the optical rotation curves of these dark matter dominated galaxies are best fitted by the Burkert profile. In the centers of galaxies, where the N-body simulations predict cuspy cores and fast rising rotation curves, our data seem to be in better agreement with the presence of soft cores.
Chincarini Guido
Conconi Paolo
D'Onghia Elena
Firmani Claudio
Marchesini Danilo
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