Optical and high-resolution H I observations of the massive and unusual lenticular galaxy NGC 5084

Details Optical and high-resolution H I observations of the massive and unusual lenticular galaxy NGC 5084 Optical and high-resolution H I observations of the massive and unusual lenticular galaxy NGC 5084

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..759g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 15, 1986, p. 759-775.

Astronomy and Astrophysics

Astronomy

18

Disk Galaxies, Galactic Structure, High Resolution, Hydrogen Ions, Spectral Resolution, Visible Spectrum, Astronomical Spectroscopy, Centimeter Waves, Galactic Evolution, Lenticular Bodies, Mass To Light Ratios, Radio Astronomy

Scientific paper

The edge-on, S0(+) galaxy NGC 5084 has been observed with the VLA telescope in the 21-cm line of atomic hydrogen. The resulting maps have an angular resolution of about 34 arcsec and a velocity resolution of about 51 km/s. The gas is found to be in a flat annulus containing some structure. The radial width of the annulus is comparable to its inner radius. Closely associated with the H I is a very faint optical disk containing some clumpy structure in its outer parts and a weak dust lane in the inner one-third of its extent. The galaxy is very massive, exceeding 10 to the 12th solar masses. It has an exceptionally large mass-to-light ratio, greater than or equal to 65 solar masses/solar-blue luminosities, and, for its type, an unusually high ratio of H I mass to blue luminosity approximately equal to 0.35 solar units. Relative to 'normal' galaxies of its mass and type, NGC 5048 appears to be underluminous by about 2 mag. The galaxy seems to be an extreme member of a class of massive, H I-rich, early-type disk galaxies. The symmetry axes of the inner lens and the H I disk coincide accurately. It is therefore most unlikely that the atomic hydrogen has been acquired by accretion.

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