A photometric and kinematic study of the barred spiral galaxy NGC 253

Details A photometric and kinematic study of the barred spiral galaxy NGC 253 A photometric and kinematic study of the barred spiral galaxy NGC 253

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........8p&link_type=abstract

Ph.D. Thesis Texas Univ., Austin.

Computer Science

4

Kinematics, Photometry, Spiral Galaxies, Brightness, Luminance, Maps, Models, Velocity Measurement

Scientific paper

Detailed iosophotometry of NGC 253 in the Sculptor Group in blue light to a limiting surface brightness of 29 magnitudes per square second was obtained from a combination of photographic and photoelectric photometry. The standard photometric parameters were derived. The absolute luminosity of NGC 253, corrected for galactic and internal extinction is LT = 2.65 x 10 to the 10th power L circle dot. A three component luminosity model of NGC 253 is derived consisting of a r to the 1/4th power spheroid, an exponential disk and a spiral arm component which contribute, respectively, 15, 59, and 26 percent of the total B luminosity. A detailed velocity map was derived from 9,842 individual radial velocity measurements on 25 H alpha interferograms convering the entire bright disk. A total mass is estimated and noncircular motions, in excess of 50 km/s, are observed in several areas.

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