Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..189h&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 189-196.
Astronomy and Astrophysics
Astrophysics
20
Centimeter Waves, Density Wave Model, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Spiral Galaxies, Astronomical Models, Galactic Rotation, Velocity Distribution
Scientific paper
H I data are compared with a computer-generated simulation based on mathematical models which assume a symmetric logarithmic spiral with linear density-wave kinematics. Initially the models are chosen to fit six regions in the Galaxy. These regions are taken from optical data: the Perseus and Carina features; and from radio data: four regions along the tangent circle. It is found that a four-arm spiral with an inclination of 13 deg will fit these six regions. The computer-generated analog to the neutral-hydrogen brightness is constructed using approximately 7-km/s sinusoidal streaming motions and has an arm/interarm density ratio of 3 to 1. This is compared with the radio data using model longitude-velocity distributions. Two other models are also fitted: a two-arm model with a weaker four-arm mode and the original four-arm spiral with corotation at 9 kpc.
No associations
LandOfFree
A possible four-arm spiral pattern in the Galaxy 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 possible four-arm spiral pattern in the Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A possible four-arm spiral pattern in the Galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1592664