Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..191e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 191-208.
Astronomy and Astrophysics
Astrophysics
23
Barred Galaxies, Hydrogen, Radio Galaxies, Spiral Galaxies, Astronomical Maps, Galactic Rotation, H I Regions, H Ii Regions, Very Large Array (Vla)
Scientific paper
Observations of the barred spiral galaxy NGC 1300 are reported and compared with theoretical models. Strong spiral structure is seen in the H I gas distribution. These neutral hydrogen arms correspond very well with the optical arms and with H II regions. The central region of the galaxy is gas-poor. This region is approximately the one occupied by the bar, suggesting a dynamical origin for the lack of gas. Analysis of the velocity field yields a systematic velocity of 1575.0 km/s, a position angle for the line of nodes of - 85.5 deg, and an inclination of 50.2 deg. The rotation curve derived from this velocity field rises to a maximum of 185 km/s and then drops slowly out to a distance of 3.2 arcmin. No evidence is seen for a truncation signature in the rotation curve. Simple mass models yielded a mass of 4.9 x 10 to the 10th solar mass for the total galaxy mass.
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