Journal Article

High-resolution spectroscopy of the blue compact dwarf galaxy Haro 15 – I. Internal kinematics

Verónica Firpo, Guillermo Bosch, Guillermo F. Hägele, Ángeles I. Díaz and Nidia Morrell

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 4, pages 3288-3297
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI:
High-resolution spectroscopy of the blue compact dwarf galaxy Haro 15 – I. Internal kinematics

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Using echelle spectroscopy, obtained at Las Campanas Observatory, we present a detailed study of the internal kinematics of the nebular material in multiple knots of the blue compact dwarf galaxy Haro 15. A detailed analysis of the complex emission-line profiles shows the presence of an underlying broad component in almost all knots, and the brightest star-forming region shows unmistakable signs for the presence of two distinct narrow kinematical components. We also study the information that our analysis provides regarding the motion of the individual knots in the Haro 15 galaxy potential, confirming that they follow galactic rotation. Finally, we examine the relation between their velocity dispersion and luminosity, finding that almost all knots follow the relation for virialized systems. This holds for the strong narrow components identified in complex fits and for single profile fits, although the latter show a flatter slope. In agreement with previous findings, in this paper we show that the existence of multiple kinematical components among massive starbursts cannot be overlooked, as it has a noticeable effect on any subsequent analysis that relies on basic parameters.

Keywords: H ii regions; galaxies: individual: Haro 15; galaxies: starburst

Journal Article.  5796 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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