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A Spiral-Like Disk of Ionized Gas in IC 1459: Signature of a Merging Collision?

Published online by Cambridge University Press:  12 April 2016

Paul Goudfrooij ,
H.U. Nørgaard-Nielsen ,
H.E. Jørgensen ,
L. Hansen  and
T. de Jong
Paul Goudfrooij
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands
H.U. Nørgaard-Nielsen
Affiliation:
Danish Space Research Institute, Gl. Lundtoftevej 15, 2800 Lyngby, Denmark
H.E. Jørgensen
Affiliation:
Copenhagen University Observatory, Øster Voldgade 3, 1350 København K, Denmark
L. Hansen
Affiliation:
Copenhagen University Observatory, Øster Voldgade 3, 1350 København K, Denmark
T. de Jong
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands

Abstract

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We report the discovery of a large (15 kpc diameter) Hα+[NII] emission-line disk in the elliptical galaxy IC 1459, showing weak spiral structure. The line flux peaks strongly at the nucleus and is more concentrated than the stellar continuum. The major axis of the disk of ionized gas coincides with that of the stellar body of the galaxy. The mass of the ionized gas is estimated to be ~ 1 105 M⊙, less than 1% of the total mass of gas present in IC 1459. The total gas mass of 4 107 M⊙ has been estimated from the dust mass derived from a broad-band colour index image and the IRAS data. We speculate that the presence of dust and gas in IC 1459 is a signature of a merger event.

Type
III. Observations of Related Objects
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 215 - 219
Copyright
Copyright © NASA 1990

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