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Ionized and neutral gas in the XUV discs of nearby spiral galaxies

Published online by Cambridge University Press:  09 February 2015

López-Sánchez ,
B. S. Koribalski ,
T. Westmeier  and
C. Esteban
López-Sánchez
Affiliation:
Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia email: Angel.Lopez-Sanchez@aao.gov.au Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia
B. S. Koribalski
Affiliation:
CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO BOX 76, Epping, NSW 1710, Australia
T. Westmeier
Affiliation:
International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
C. Esteban
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
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Abstract

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We are conducting a multiwavelength study of XUV discs in nearby, gas-rich spiral galaxies combining the available UV (GALEX) observations with H i data obtained at the ATCA as part of the Local Volume HI Survey (LVHIS) project and multi-object fibre spectroscopy obtained using the 2dF/AAOmega instrument at the 3.9m AAT. Here we present the results of the multiwavelength analysis of the galaxy pair NGC 1512/1510. The H i distribution of NGC 1512 is very extended with two pronounced spiral/tidal arms. Hundreds of independent UV-bright regions are associated with dense H i clouds in the galaxy outskirts. We confirm the detection of ionized gas in the majority of them and characterize their physical properties, chemical abundances and kinematics. Both the gas distribution andthe distribution of the star-forming regions are affected by gravitational interactionwith the neighbouring blue compact dwarf galaxy NGC 1510. Our multiwavelength analysis provides new clues about local star-formation processes, the metal redistribution in the outer gaseous discs of spiral galaxies, the importance of galaxy interactions, the fate of the neutral gas and the chemical evolution in nearby galaxies.

Keywords

galaxies: ISMabundanceskinematics and dynamicsevolutioninteractionsdwarfindividual: NGC 1510NGC 1512
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 65 - 68
Copyright
Copyright © International Astronomical Union 2015 

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