•  
  •  
 

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

Abstract

In this work, we develop the theory of the origin of galactic bulges, and gravitational instability of the bending, as well as modes of perturbation based on the background of a nonlinear non-stationary model. As a result, here, we propose critical diagrams and determine increments of instabilities for such types of perturbations. In addition, we also consider relationships between the masses of the bulge and the central black hole, which is of great importance in studying the evolution of the bulges of spiral galaxies. Moreover, problems on the evolution of bulges in spiral galaxies, together with discussions of their main species and physical mechanisms in their formation.

First Page

34

Last Page

43

References

1. Fisher D.B., Drory N. Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution. ApJ. 733, L47 (2011).

2. Kormendy J., Kennicutt R.C. Jr. Secular Evolution and the Formation of Pseudobulges in Disk Galaxies. ARA&A, 42, 603 (2004).

3. Kormendy J., Bender R. Structural Analogs of the Milky Way Galaxy: Stellar Populations in the Boxy Bulges of NGC 4565 and NGC 5746. ApJS, 198, 2 (2019).

4. Jarvis B.J. A search for box- and peanut-shaped bulges. AJ, 91, 65, (1986).

5. Shaw M.A. The nature of 'box' and 'peanut' shaped galactic bulges. MNRAS, 229, 691-706 (1987).

6. De Souza R.E., Dos Anjos S., Box-shaped galaxies: a complete list. A& AS, 70, 465 (1987).

7. Combes F., Sanders R.H. Formation and properties of persisting stellar bars. A&A. 96, 164 (1981).

8. May A., van Albada T.S., Norman C.A., A self-consistent box-shaped galaxy. MNRAS. 214, 131 (1985).

9. Binney J., Petrou M. Structure of box-shaped bulges and other spheroidal components. MNRAS. 214, 449 (1985).

10. Nuritdinov S.N. Bulges and ellipticals: can formation mechanisms be the same? IAUS. Vol. 153, p.403 (1993).

11. Nuritdinov S.N., et al. Instabilities in a nonstationary model of self-gravitating disks. II. Warp modes of vertical oscillations Astrophysics. 52, 4, pp.584-597 (2009).

12. Fridman A.M., Polyachenko V.L. Physics of gravitating systems. Springer-Verlag (1984).

13. Magorrian J., Tremaine S., Richstone D., et al. The Demography of Massive Dark Objects in Galaxy Centers. AJ. 115, pp.2285-2305 (1998).

14. Marconi A., Hunt L.K. The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity. ApJ. 589, pp.L21-24 (2003).

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.