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Titolo:
Determination of the mass distribution in galactic centers
Autore:
Wittkowski, M; Duschl, WJ;
Indirizzi:
Max Planck Inst Radioastron, D-53121 Bonn, Germany Max Planck Inst Radioastron Bonn Germany D-53121 , D-53121 Bonn, Germany Inst Theoret Astrophys, D-69121 Heidelberg, Germany Inst Theoret Astrophys Heidelberg Germany D-69121 21 Heidelberg, Germany
Titolo Testata:
NEW ASTRONOMY
fascicolo: 7, volume: 4, anno: 1999,
pagine: 543 - 555
SICI:
1384-1092(199912)4:7<543:DOTMDI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR CLOUDS; BLACK-HOLE; NGC-1068; REGION; MOTIONS; DISK;
Keywords:
galaxies : fundamental parameters; galaxies : kinematics and dynamics; galaxies : nuclei; galaxies : structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Wittkowski, M Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, GermanyMax Planck Inst Radioastron Hugel 69 Bonn Germany D-53121 y
Citazione:
M. Wittkowski e W.J. Duschl, "Determination of the mass distribution in galactic centers", NEW ASTRON, 4(7), 1999, pp. 543-555

Abstract

We investigate how well one can determine the gravitational potential in galactic centers from an analysis of the observed line-of-sight velocities of interstellar material, e.g. (giant) molecular clouds. In this paper, we aim to demonstrate the principle of our approach. Therefore, we use simulated sets of data. We model the mass distribution as a combination of a point-like central mass and an extended component. We calculate the observable distribution of line-of-sight velocities in the corresponding gravitational potential for different global flow patterns (purely circular motion, accretion disks, in-and outflows). We fit this data to previously unknown flow patterns and determine the degree of accuracy of the mass parameters by meansof a Monte Carlo technique. We find that the best fit mass parameters typically differ from the true parameters by factors of 1 to 5 (with mass-parameters as expected for Seyfert Galaxies, a spectral resolution of 20 km/s, and a spatial distribution of 50 observed clouds within 300 pc), in some cases even more. This implies that, in addition to purely circular motion, other flow patterns should be considered when interpreting real data. (C) 1999Elsevier Science B.V. All rights reserved.

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Documento generato il 05/12/20 alle ore 23:42:22