Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..785s&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.785-802.
Astronomy and Astrophysics
Astronomy
38
Galaxies: Individual (Ngc 253), Galaxies: Kinematics And Dynamics, Galaxies: Starburst, Galaxies: Structure, Ism: Molecules
Scientific paper
The large scale mapping of the disk of a nearby barred galaxy, NGC 253 in CO (J=1-0), was made with an angular resolution of 16''. Molecular gas concentrates in the nuclear region and the large-scale bar seen in near-infrared images. The radial distribution of molecular gas indicates a secondary peak, whose radius agrees with that of the Hα ring and the ends of the bar, as well as a central strong peak. The radial distribution is well fitted by an exponential function or a power law outside the secondary peak. A rotation curve is rising in the inner region and changes to flat at the ring. These facts suggest that molecular gas infalls from the outer disk by losing angular momentum due to gaseous viscosity in the region of the differential rotation, and accumulates at the ring. In the bar region (and within the corotation radius), molecular gas again loses its angular momentum due to the bar potential, and is infalling toward the nuclear region. The upper limit of the noncircular motion along the major axis of the bar in the leading edge of the bar is ~ 70-130 km s-1 in the rest frame of the bar.
Hasegawa Tetsuo
Kuno Nario
Nakai Naomasa
Nishiyama Kohta
Sorai Kazuo
No associations
LandOfFree
Distribution and Kinematics of Molecular Gas in Barred Spiral Galaxies. II. NGC 253 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Distribution and Kinematics of Molecular Gas in Barred Spiral Galaxies. II. NGC 253, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Distribution and Kinematics of Molecular Gas in Barred Spiral Galaxies. II. NGC 253 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1106777