Detection of retrograde gas streaming in the SB0 galaxy NGC 4546

Details Detection of retrograde gas streaming in the SB0 galaxy NGC 4546 Detection of retrograde gas streaming in the SB0 galaxy NGC 4546

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..531g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 15, 1987, p. 531-535.

Astronomy and Astrophysics

Astrophysics

47

Astronomical Spectroscopy, Barred Galaxies, Cosmic Gases, Gas Dynamics, Stellar Motions, Absorption Spectra, Emission Spectra, Line Spectra, Stellar Orbits

Scientific paper

Spectroscopic observations are reported of the almost edge-on SB0 galaxy NGC 4546 which reveal a striking discordance between the derived emission and absorption-line velocities. The gas clouds show velocities that are similar in amplitude but opposite in direction from the stars. This discordance is seen in observations obtained through slits oriented in a wide range of position angles. NGC 4546 is thus, at present, unique as a disk system exhibiting large-scale retrograde motions relative to the stellar component. Orbits elongated both along the bar major axis (prograde, stars) and along the bar intermediate axis (retrograde, gas) are found. The possibility that this material originated from an infall is discussed.

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