H I observations of three IRAS detected elliptical galaxies

Abstract

view Abstract Citations (21) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS H i Observations of Three IRAS Detected Elliptical Galaxies Walsh, D. E. P. ; van Gorkom, J. H. ; Bies, W. E. ; Katz, N. ; Knapp, G. R. ; Wallington, S. Abstract 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, the 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 (ISM) 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. NGC 6958 has only weak radio continuum emission, and the lower limit on L_IR_/M_HI_ is at the high end of the range for this quantity among ellipticals. It is likely that a small amount of dust heated by a strong radiation field is providing the far- infrared 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. Publication: The Astrophysical Journal Pub Date: April 1990 DOI: 10.1086/168556 Bibcode: 1990ApJ...352..532W Keywords: 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; Astrophysics; GALAXIES: INTERACTIONS; INFRARED: SOURCES; RADIO SOURCES: GALAXIES; RADIO SOURCES: 21 CM RADIATION full text sources ADS | data products NED (8) SIMBAD (7)