Stellar and gas kinematics of NGC 4546, the double-spin SBO

Details Stellar and gas kinematics of NGC 4546, the double-spin SBO Stellar and gas kinematics of NGC 4546, the double-spin SBO

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..544b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 544-554.

Astronomy and Astrophysics

Astronomy

22

Barred Galaxies, Galactic Rotation, Gas Dynamics, Stellar Rotation, Astronomical Photometry, Astronomical Spectroscopy, Counter Rotation, Radio Astronomy, Spin Dynamics

Scientific paper

Photometric, spectroscopic, optical, and neutral-hydrogen observations are presented of NGC 4546, a barred SO galaxy possessing a disk of gas rotating in the opposite direction compared to the stellar disk. The relative circular velocities exceed 350 km/s. The stellar velocity dispersion and the width of the emission lines within the galaxy are analyzed. H-alpha imaging reveals a bright condensation close to the center of the galaxy, possibly a remnant of the center of a small galaxy captured by NGC 4546. On the basis of optical spectroscopy and H I observations, it is shown that the gas disk is more dense on the NE side of the galaxy. Large irregular motions are detected in the gas disk. The intensity ratios between N II, S II, and O III forbidden lines along the major axis indicate values intermediate between galaxy nuclei and galactic H II regions. To first order the gas rotates in a disk, but large irregular motions are superimposed. An external origin of the gas, by means of capture of a small galaxy or a gas cloud more recent than about 10 to the 9th yr is suggested.

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