Journal Article

The circumnuclear environment of the peculiar galaxy NGC 3310

Guillermo F. Hägele, Ángeles I. Díaz, Mónica V. Cardaci, Elena Terlevich and Roberto Terlevich

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 2, pages 1005-1026
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15934.x
The circumnuclear environment of the peculiar galaxy NGC 3310

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Gas and star velocity dispersions have been derived for eight circumnuclear star-forming regions (CNSFRs) and the nucleus of the spiral galaxy NGC 3310 using high-resolution spectroscopy in the blue and far red. Stellar velocity dispersions have been obtained from the Ca ii triplet in the near-IR, using cross-correlation techniques, while gas velocity dispersions have been measured by Gaussian fits to the Hβ λ4861 Å and [O iii] λ5007 Å emission lines.

The CNSFR stellar velocity dispersions range from 31 to 73 km s−1. These values, together with the sizes measured on archival Hubble Space Telescope images, yield upper limits to the dynamical masses for the individual star clusters between 1.8 and 7.1 × 106 M, for the whole CNSFR between 2 × 107 and 1.4 × 108 M, and 5.3 × 107 M, for the nucleus inside the inner 14.2 pc. The masses of the ionizing stellar population responsible for the H ii region gaseous emission have been derived from their published Hα luminosities and are found to be between 8.7 × 105 and 2.1 × 106 M for the star-forming regions and 2.1 × 105 M for the galaxy nucleus; they therefore constitute between 1 and 7 per cent of the total dynamical mass.

The ionized gas kinematics is complex; two different kinematical components seem to be present as evidenced by different linewidths and Doppler shifts.

Keywords: H ii regions; galaxies: individual: NGC 3310; galaxies: kinematics and dynamics; galaxies: starburst; galaxies: star clusters

Journal Article.  13219 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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