Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314...57l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 57-69.
Astronomy and Astrophysics
Astronomy
39
Elliptical Galaxies, Galactic Structure, Hydrogen Atoms, Astronomical Photometry, Interstellar Gas, Kinematics, Radio Sources (Astronomy), Stellar Mass Ejection
Scientific paper
The neutral hydrogen distribution in four low-luminosity elliptical galaxies was imaged using the VLA, and B and V CCD images were obtained to determine their luminosity profiles. The brighter two of these galaxies, NGC 5666 and NGC 3265, show gapped disks, a feature typical of the H I distribution in the few bright early-type galaxies mapped to date. The gas in NGC 5666 extends to nearly 20 times the half-light radius, making it an ideal probe for the presence of dark matter. The fainter two galaxies, UGC 7354 and A1230 + 09, have centrally concentrated gas distributions, but the H I again extends to twice the Holmberg radius. The velocity distributions in the galaxies show more or less regular rotation, NGC 5666 being remarkably regular for an elliptical galaxy. In all cases, the large radial extent of the gas is compelling evidence against its origin being stellar mass loss from the luminous stellar figure.
Lake George
Schommer Robert A.
van Gorkom Jacqueline H.
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