Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-04-20
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
20 pages, 12 figures, 6 tables. Accepted for publication in MNRAS
Scientific paper
(Abridged) Gas and star velocity dispersions have been derived for four circumnuclear star-forming regions (CNSFRs) and the nucleus of the spiral galaxy NGC2903 using high resolution spectroscopy in the blue and far red. Stellar velocity dispersions have been obtained from the CaII triplet (CaT) lines at 8494, 8542, 8662A, using cross-correlation techniques while gas velocity dispersions have been measured by Gaussian fits to the Hbeta line. The CNSFRs, with sizes of about 100 to 150pc in diameter, show a complex structure at the Hubble Space Telescope resolution, with a good number of subclusters with linear diameters between 3 and 8pc. Their stellar velocity dispersions range from 39 to 67 km/s. These values, together with the sizes measured on archival HST images yield upper limits to the dynamical masses for the individual star clusters between 1.8 and 8.7 x 10$^6$ M$_\odot$ and upper limits to the masses for the whole CNSFR between 4.9 x 10$^6$ and 4.3 x 10$^7$ M$_\odot$. ...
Cardaci Monica V.
Diaz Angeles I.
Hagele Guillermo F.
Terlevich Elena
Terlevich Roberto
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