Kinematics of the Ionized Gas in NGC 253

Details Kinematics of the Ionized Gas in NGC 253 Kinematics of the Ionized Gas in NGC 253

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..199a&link_type=abstract

Astronomical Journal v.110, p.199

Astronomy and Astrophysics

Astronomy

24

Galaxies: Individual: Ngc 253, Galaxies: Starburst, Galaxies, Fundamental Parameters

Scientific paper

High resolution optical spectra acquired with the ESO New Technology Telescope + the ESO-Multimode Instrument along the major axis of the barred Sc starburst galaxy NGC 253 give detailed information on the kinematics of the galaxy at different scales from the inner nuclear region up to distances of 10'. We find strong evidence for a nuclear ring about 20" in diameter, with a circular velocity V_max_ = 110 km/s, which is possibly responsible for the gas supply to the nuclear starburst region of the galaxy. The analysis of the dynamics of the bar in NGC 253 indicates that the nuclear ring is related to the presence of an inner Lindblad resonance at ~300 pc. In this framework, the observed velocities indicate a mass in the central 10" of 3 X 10^8^ M_sun_. Good agreement is obtained between the new optical data and published H I rotation curves at larger radii.

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