Radio Radiation from Normal Spiral Galaxies

1967 ◽  
Vol 150 ◽  
pp. 413 ◽  
Author(s):  
Yervant Terzian
Keyword(s):  
Spiral Galaxies ◽  
Radio Radiation ◽  
Normal Spiral

scholarly journals Minibars in the Centers of Normal Galaxies

1996 ◽  
Vol 157 ◽  
pp. 207-211
Author(s):  
A. V. Zasov ◽  
O. K. Sil’chenko
Keyword(s):  
High Frequency ◽  
Spiral Galaxies ◽  
Velocity Fields ◽  
Frequency Of Occurrence ◽  
Gas Velocity ◽  
Ionized Gas ◽  
Normal Galaxies ◽  
Normal Spiral

AbstractAnalysis of ionized gas velocity fields in the circumnuclear regions of 13 normal spiral galaxies has shown that about half of them reveal a discrepancy between the kinematical axis at R < 2″ and the photometric or kinematical axes of the outer regions. This result indicates a high frequency of occurrence of non-axisymmetric gravitational potentials in the inner few hundred parsecs of galaxies. The possible nature of these minibars is discussed.

X-Ray Obervation of the Normal Spiral Galaxies NGC2903 and NGC628 with ASCA

1998 ◽  
pp. 284-285
Author(s):  
T. Mizuno ◽  
H. Ohbayashi ◽  
N. Iyomoto ◽  
K. Makishima
Keyword(s):  
Spiral Galaxies ◽  
X Ray ◽  
Normal Spiral

X-ray observations of the normal spiral galaxies with ASCA

2000 ◽  
Vol 25 (3-4) ◽  
pp. 395-398
Author(s):  
Tsunefumi Mizuno ◽  
Kazuo Makishima
Keyword(s):  
Spiral Galaxies ◽  
X Ray ◽  
Normal Spiral

scholarly journals NGC 891: A Summary of Observations

1991 ◽  
Vol 144 ◽  
pp. 287-294
Author(s):  
R. J. Allen ◽  
S. Sukumar
Keyword(s):  
Spiral Galaxies ◽  
Radio Continuum ◽  
Physical Processes ◽  
Normal Spiral

Three questions are posed, the answers to which are relevant to our understanding of the physical processes which shape the radio continuum morphology of normal spiral galaxies. Observations of the edge-on galaxy NGC 891 have been made for many years by several groups with the intention of contributing at least partial answers to these questions. We review here the work which we have recently done on this subject.

scholarly journals Theoretical Considerations on the Dynamics of Normal Galactic Nuclei

1980 ◽  
Vol 5 ◽  
pp. 197-204
Author(s):  
Robert H. Sanders
Keyword(s):  
Spatial Distribution ◽  
Gravitational Field ◽  
Mass Distribution ◽  
Rotation Curve ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Galactic Nuclei ◽  
The Galaxy ◽  
Theoretical Considerations ◽  
Normal Spiral

I want to discuss the origin of non-circular gas motions observed in the nuclei of normal spiral galaxies and the possibility that recurring violent activity in normal nuclei excites such motion. But first, let us review several basic aspects of the nearest normal galactic nucleus — the nucleus of our own Galaxy.The rotation curve as observed in the 21-cm line of neutral hydrogen gives some indication of the form of the gravitational field in the central region of the Galaxy. Figure 1 is a smooth fit to the rotation curve in the inner few kiloparsecs (solid line) taken essentially from the data of Rougoor and Oort (1960) and Simonson and Mader (1973). This rotation curve, within 1 kpc of the centre, is completely accounted for by the mass distribution implied by the extended 2.2-μ emission (Becklin and Neugebauer 1968, Oort 1971). Moreover, there is little doubt that this centrally condensed mass distribution should be identified with the bulge or spheroidal component of the Galaxy, because the spatial distribution of the 2.2-μ intensity is practically identical to the distribution of visible starlight in the bulge of M31 (Sandage, Becklin, and Neugebauer 1969). The conclusion is that the bulge overwhelmingly dominates the gravitational field inside of 1 kpc.

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