scholarly journals Nonlinear cosmogony of the spiral galaxy bulges

2021 ◽  
Vol 30 (1) ◽  
pp. 144-148
Author(s):  
Farkhod Botirov ◽  
Salakhutdin Nuritdinov
Keyword(s):  
Dispersion Equation ◽  
Spiral Galaxy ◽  
Central Region ◽  
Rotation Rate ◽  
Composite Model ◽  
Perturbation Mode ◽  
Composite Nature

Abstract In this paper, we develop an early idea of one of the authors (Nuritdinov 1992a,b), who was the first to propose the mechanism of instability of the warp perturbation mode on the background of a nonstationary disk. For this aim, we have studied a model of a nonlinearly non-stationary self-gravitating disk with an anisotropic velocity diagram. The model has a composite nature, or rather, it is a superposition of isotropic and anisotropic states of the disk. In the general case, it is obtained a nonstationary analogue of the dispersion equation of this composite model. We have also investigated the behavior of the domed perturbation mode, the instability of which leads to the formation of a classical bulge in the central region of the disk. In addition, we considered the critical diagrams of the dependence of the virial ratio on the rotation rate of the system for various values of the superposition parameter and the corresponding diagrams for the increments of instability.

Bipolar outflow of gas in the spiral galaxy NGC 3079

1986 ◽  
Vol 64 (4) ◽  
pp. 531-535 ◽  
Author(s):  
Nebojsa Duric ◽  
E. R. Seaquist
Keyword(s):  
Spectral Index ◽  
Spiral Galaxy ◽  
Central Region ◽  
Qualitative Description ◽  
Radio Continuum ◽  
Large Array ◽  
Very Large Array ◽  
Bipolar Outflow ◽  
The Galaxy

Very large array, radio-continuum observations of the edge-on spiral galaxy NGC 3079 are presented. The observations reveal that the nucleus has windlike properties and that the central region of the galaxy exhibits an unusual figure-eight morphology that shows evidence of severe depolarization and a flattening spectral index away from the nucleus. A qualitative description of a model is presented to account for the observed radio properties. It is shown that a wind-driven shock propagating away from the nucleus and focused by the ambient disk gas can give rise to the observed morphology.

scholarly journals CO (2-1) in IC 342

1994 ◽  
Vol 140 ◽  
pp. 300-305
Author(s):  
Jean L. Turner ◽  
David Hudson ◽  
Robert L. Hurt
Keyword(s):  
Spiral Galaxy ◽  
Central Region ◽  
High Ratio ◽  
Aperture Synthesis ◽  
High Signal ◽  
Signal To Noise

AbstractWe present aperture synthesis maps of the CO J=2-1 emission in the central region of the spiral galaxy IC 342. The 4” resolution maps reveal emission that is a factor of two brighter than the CO (1-0) emission mapped at the same resolution. Since the CO (2-1) emission is likely to be optically thick, the high ratio is probably due to the fact that the two transitions sample different cloud layers in externally heated clouds. The high signal to noise of the maps indicates that CO (2-1) will be a powerful tool in the study of gas in galaxies.

scholarly journals THE CENTRAL REGION OF THE BARRED SPIRAL GALAXY NGC 1097 PROBED BY AKARI NEAR-INFRARED SPECTROSCOPY

2012 ◽  
Vol 751 (1) ◽  
pp. L18 ◽  
Author(s):  
Toru Kondo ◽  
Hidehiro Kaneda ◽  
Shinki Oyabu ◽  
Daisuke Ishihara ◽  
Tatsuya Mori ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Spiral Galaxy ◽  
Central Region ◽  
Near Infrared ◽  
Barred Spiral Galaxy

scholarly journals A High-Resolution CO Mapping of the Nucleus of the Barred-Spiral Galaxy, M83

1994 ◽  
Vol 140 ◽  
pp. 341-342 ◽  
Author(s):  
Toshihiro Handa ◽  
Sumio Ishizuki ◽  
Ryohei Kawabe
Keyword(s):  
High Resolution ◽  
Spiral Galaxy ◽  
Central Region ◽  
Molecular Gas ◽  
Nuclear Region ◽  
Circular Rotation ◽  
Frequency Coverage ◽  
Barred Spiral Galaxy ◽  
Gas Response ◽  
Co Emission

M83 is the best sample to investigate gas response to bar potential because it is one of the nearest galaxy with a pronounced bar structure (distance=3.7 Mpc). Handa et al. (1990) observed it with the Nobeyama 45-m telescope in CO(J=1-0) and found concentration of the CO emission to the dust lanes along the bar and non-circular rotation. However we need better spatial resolution in order to investigate kinematics and distribution of molecular gas in the nuclear region. So we observe the central region of M83 using the Nobeyama Millimeter Array. The synthesized beamsize was 12″ × 6″ and frequency coverage was 325 km s-1.

scholarly journals Stellar populations in the central region of the barred spiral galaxy NGC 4900

2010 ◽  
Vol 404 (2) ◽  
pp. 811-829 ◽  
Author(s):  
Simon Cantin ◽  
Carmelle Robert ◽  
Mercedes Mollá ◽  
Anne Pellerin
Keyword(s):  
Spiral Galaxy ◽  
Central Region ◽  
Stellar Populations ◽  
Barred Spiral Galaxy

scholarly journals The Stellar Content in the Central Region of M81

1999 ◽  
Vol 192 ◽  
pp. 373-376
Author(s):  
Monique Joly ◽  
Catherine Boisson ◽  
Didier Pelat
Keyword(s):  
Mathematical Method ◽  
Observational Data ◽  
Spiral Galaxy ◽  
Central Region ◽  
Stellar Population ◽  
Stellar Populations ◽  
Stellar Content ◽  
Synthetic Spectra ◽  
Central Regions

Using long slit spectroscopy, we investigate the stellar population and reddening gradients inside the central regions of the nearby spiral galaxy M81. Observational data are analyzed using a new mathematical method. The basic elements to construct the synthetic spectra are taken from a database of star spectra. We show the ability of this method to define detailed stellar populations and to differentiate between age and metallicity effects.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

Access to effective ABA treatment in Ohio: Central region

2004 ◽  
Author(s):  
Christine Averill ◽  
Jacquie Wynn
Keyword(s):  
Central Region
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