H I observations of three IRAS detected elliptical galaxies

Details H I observations of three IRAS detected elliptical galaxies H I observations of three IRAS detected elliptical galaxies

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..532w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 532-543.

Astronomy and Astrophysics

Astronomy

18

Elliptical Galaxies, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Neutral Gases, Radio Sources (Astronomy), Very Large Array (Vla), Data Reduction, Flux Density, H Lines, Hydrogen, Interstellar Matter, Spiral Galaxies

Scientific paper

Three elliptical galaxies with strong far-infrared emission (IRAS flux density greater than 1 Jy at 100 microns) were observed in the H I 21 cm line with the VLA. Only one of these, dwarf NGC 855, was detected. This galaxy has an extended H I distribution which is highly inclined to the optical major axis and a weak radio continuum source. Deep optical images show complex structure in the inner regions and emission lines suggestive of star formation. It is likely that this star formation and the cool interstellar medium are sources for the far-IR luminosity. IC 1459 is in a group containing several spirals and shows signs of recent interaction. Neutral hydrogen was not detected, but there is a powerful central radio continuum source, and the 100-micron emission is plausibly explained as arising from this source. It is likely that a small amount of dust heated by a strong radiation field is providing the far-IR luminosity. The infrared properties of these galaxies are similar, but the IR emission seems to have three different origins, complicating the interpretation of IRAS data for ellipticals.

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