Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T05:44:01.380Z Has data issue: false hasContentIssue false
  • English
  • Français

A Self-Consistent Dynamical Model for the COBE Observed Galactic Bar and Its Application to Microlensing

Published online by Cambridge University Press:  12 April 2016

HongSheng Zhao
HongSheng Zhao*
Affiliation:
Max-Planck-Institute für Astrophysik, 85740 Garching, Germany

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

A self-consistent stellar dynamical model for the Galactic bar is constructed from about 500 numerically computed orbits with an extension of the Schwarzschild technique. The model fits the COBE found asymmetric boxy light distribution and the observed stellar kinematics of the bulge. The model potential is also consistent with the non-circular motions of the HI and CO velocity maps of the inner Galaxy. We also use the stellar bar model to construct an N-body model to study stability and a microlensing map towards the bulge, which can account for the observed optical depth and the event duration by the MACHO and OGLE collaborations. The technique used here can be applied to interpret light and velocity data of external bulges/bars and galactic nuclei.

Type
Part IX. The Galaxy as a Barred Spiral
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 549 - 553
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Alcock, C., Allsman, R.A., Axelrod, T.S., Bennett, D.P., Cook, K.H., Freeman, K.C., Griest, K. et al. 1995, ApJ, 445, 133 CrossRefGoogle Scholar
Binney, J., Gerhard, O.E., Stark, A.A., Bally, J., & Uchida, K.I. 1991, MNRAS, 252, 210 CrossRefGoogle Scholar
Dwek, E., Arendt, R.G., Hauser, M.G., Kelsall, T., Lisse, C.M., Moseley, S.H., Silverberg, R.F. et al. 1995, ApJ, 445, 716 Google Scholar
Hernquist, L. & Ostriker, J.P. 1992, ApJ, 386, 2, 375 CrossRefGoogle Scholar
Kent, S.M. 1992, ApJ, 387, 181 CrossRefGoogle Scholar
Schwarzschild, M. 1979, ApJ, 232, 236 Google Scholar
Sharples, R., Walker, A., & Cropper, M. 1990, MNRAS, 246, 54 Google Scholar
Spaenhauer, A., Jones, B.F., & Whitford, A.E. 1992, AJ, 103, 297 CrossRefGoogle Scholar
Terndrup, D.M., Mailloux, T., Frogel, J., & Wells, L.A. 1995, in preparationGoogle Scholar
Udalski, A., Szymański, M., Stanek, K.Z., Kaluźny, , Kubiak, M., Mateo, M., Krzemiński, W. et al. 1994, Acta Astronomica, 44, 165.Google Scholar
Weiland, J.L., Arendt, R.G., Berriman, G.B., Dwek, E., Freudenreich, H.T., Hauser, M.G., Kelsall, T. et al. 1994, ApJ, 425, L81 Google Scholar
Zhao, H.S. 1994, Ph.D. thesis, Columbia University, New York Google Scholar
Zhao, H.S. 1995, submitted to MNRASGoogle Scholar
Zhao, H.S., Spergel, D.N., & Rich, R.M. 1994, AJ, 108, 2154 CrossRefGoogle Scholar
Zhao, H.S., Spergel, D.N., & Rich, R.M. 1995a, ApJ, 440, L13 CrossRefGoogle Scholar
Zhao, H.S., Rich, R.M., & Spergel, D.N. 1995b, in preparationGoogle Scholar