Cospatial counterrotating stellar disks in the Virgo E7/S0 galaxy NGC 4550

Details Cospatial counterrotating stellar disks in the Virgo E7/S0 galaxy NGC 4550 Cospatial counterrotating stellar disks in the Virgo E7/S0 galaxy NGC 4550

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394l...9r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

138

Counter Rotation, Elliptical Galaxies, Stellar Structure, Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Galactic Structure, Luminosity, Virgo Galactic Cluster

Scientific paper

Two cospatial stellar disks, one orbiting prograde, one orbiting retrograde, in NGC 4550, an E7/S0 galaxy in the core of the Virgo Cluster have been discovered. One of the stellar disks is coincident with a gas disk. Absorption and emission-line velocities for the two counterrotating components have been measured over about one-third of the optical diameter. It is proposed that after the initial stellar disk of NGC 4550 was formed, a substantial amount of counterrotating gas was acquired greater than or equal to 10 exp 9 yr ago. It then settled to the plane via dissipation; the bulk of the counterrotating stars most likely formed after the gas settled to the plane.

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