An extended disk of ionized gas in IC 1459

Details An extended disk of ionized gas in IC 1459 An extended disk of ionized gas in IC 1459

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228l...9g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

20

Elliptical Galaxies, Emission Spectra, Galactic Structure, Interacting Galaxies, Interstellar Gas, Ionized Gases, Forbidden Transitions, H Alpha Line, Nitrogen, Spiral Galaxies

Scientific paper

The discovery is reported of a large (15 kpc diameter) H-alpha + forbidden N II emission-line region in the elliptical galaxy IC 1459, showing weak spiral-like structure. 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 about 100,000 solar masses, less than 1 percent of the total mass of gas present in IC 1459. The total gas mass of 40 million solar masses has been estimated from the dust mass derived from a color index image and the IRAS data. It is speculated that the presence of dust and gas in IC 1459 is a signature of a merger event.

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