Spiral structure of the giant galaxy UGC 2885 - H-alpha kinematics

Details Spiral structure of the giant galaxy UGC 2885 - H-alpha kinematics Spiral structure of the giant galaxy UGC 2885 - H-alpha kinematics

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..457c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 457-469.

Astronomy and Astrophysics

Astrophysics

10

Density Wave Model, Galactic Structure, H Alpha Line, Radial Flow, Spiral Galaxies, Velocity Distribution, Fabry-Perot Spectrometers, Kinematics, Stellar Spectra

Scientific paper

The TAURUS I imaging Fabry-Perot spectrometer is used to map the velocity field of the giant spiral galaxy UGC 2885 in H-alpha emission at 5-arcsec resolution. Ripples in the velocity field around the minor axis indicate radial flows across the spiral arms. The radial flow speeds in the plane of the disk show 50-70 km/s peak-to-peak variation, suggesting that a strong density wave is present in the underlying stellar disk. Such high speeds may alternatively be a natural consequence of the open arm spiral patterns. Strong density waves may naturally occur in large spiral galaxies or in spiral galaxies as massive as UGC 2885.

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