Universität zu Köln

Jalali, B., Pelupessy, F. I., Eckart, A., Zwart, S. Portegies, Sabha, N., Borkar, A., Moultaka, J., Muzic, K. and Moser, L. (2014). Star formation in the vicinity of nuclear black holes: young stellar objects close to Sgr A*. Mon. Not. Roy. Astron. Soc., 444 (2). S. 1205 - 1221. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

Full text not available from this repository.

Abstract

It is often assumed that the strong gravitational field of a super-massive black hole disrupts an adjacent molecular cloud preventing classical star formation in the deep potential well of the black hole. Yet, young stars have been observed across the entire nuclear star cluster of the Milky Way including the region close (<0.5 pc) to the central black hole, Sgr A*. Here, we focus particularly on small groups of young stars, such as IRS 13N located 0.1 pc away from Sgr A*, which is suggested to contain about five embedded massive young stellar objects (<1 Myr). We perform three-dimensional hydrodynamical simulations to follow the evolution of molecular clumps orbiting about a 4 x 10(6) M-circle dot black hole, to constrain the formation and the physical conditions of such groups. The molecular clumps in our models are assumed to be isothermal containing 100 M-circle dot in <0.2 pc radius. Such molecular clumps exist in the circumnuclear disc of the Galaxy. In our highly eccentrically orbiting clump, the strong orbital compression of the clump along the orbital radius vector and perpendicular to the orbital plane causes the gas densities to increase to values higher than the tidal density of Sgr A*, which are required for star formation. Additionally, we speculate that the infrared excess source G2/DSO approaching Sgr A* on a highly eccentric orbit could be associated with a dust-enshrouded star that may have been formed recently through the mechanism supported by our models.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jalali, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pelupessy, F. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zwart, S. Portegies UNSPECIFIED UNSPECIFIED UNSPECIFIED Sabha, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borkar, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moultaka, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muzic, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moser, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-425619
DOI:	10.1093/mnras/stu1483
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	444
Number:	2
Page Range:	S. 1205 - 1221
Date:	2014
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GALACTIC-CENTER; POSSIBLE ORIGIN; PROPER MOTIONS; CENTRAL PARSEC; GAS CLOUD; MASS STAR; MILKY; DISK; SIMULATIONS; ACCRETION Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42561