Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1592r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 4, p. 1592-1607
Astronomy and Astrophysics
Astronomy
46
H I Regions, Kinematics, Morphology, Rotating Disks, Spiral Galaxies, Star Formation, Brightness, Hydrogen, Optical Measuring Instruments
Scientific paper
We describe the results of a lambda 21 cm study of the morphology and dynamics of the nearby, southern, barred spiral galaxy NGC 1313 made with the Australian Telescope Compact Array (ATCA). The galaxy has a high H I surface density (the azimuthal average peaking at approximately solar mass/sq pc) and a very extensive (24 kpc) disk, containing outer H I arms with no stellar counterparts even on very deep UK Schmidt and Anglo-Australian Telescope (AAT) images. Kinematically, NGC 1313 is a well-behaved rotating disk system inclined at 48 deg and we discount the suggestions of previous authors that it is a multiple system. Significant kinematic distortions are brought about by the presence of a number of H I supershells the largest of which spans 20% of the total H I diameter of the galaxy. The presence of these supershells is responsible for previous erroneous suggestions that NGC1313 is an asymmetric rotator. For the largest supershell, the required power is approximately 3 X 1039 ergs/s over its dynamical age of 107 yr. This is one of the largest supershells so far discovered. Its existence implies that the neutral gas disk of GC 1313 has a scale height of order 1 kpc to prevent the bubble blowing out of the disk. The kinematic signature of an expanding bubble and a rotating disk can be used to show that the spiral arms of NGC 1313 are trailing.
Malin David
Ryder Stuart D.
Staveley--Smith Lister
Walsh Wilfred
No associations
LandOfFree
A new optical and H I study of the nearby galaxy NGC 1313 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 A new optical and H I study of the nearby galaxy NGC 1313, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new optical and H I study of the nearby galaxy NGC 1313 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1827977