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Spiral Arm Tangencies in the Milky Way

Published online by Cambridge University Press:  01 June 2008

Robert A. Benjamin
Robert A. Benjamin*
Affiliation:
Department of Physics, University of Wisconsin-Whitewater, 800 West Main St., Whitewater, WI, USA email: [email protected]
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Abstract

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The historical directions of spiral arm tangencies in the Milky Way are presented and compared to results of mid-infrared star counts using the Spitzer Space Telescope. While the Scutum and Centaurus tangency directions show a 20-30% excess of star counts, all other expected tangency directions show no similar increases. These two tangencies are probably associated with a density wave arm that comes off the near side of the bar of the Galaxy while the other arms whose tangencies are not detected may be compression in the gas, but not in the old stellar disk.

Keywords

Galaxy: structure – Galaxy: disk – Galaxy: fundamental parameters – Galaxy: kinematics and dynamics – Galaxy: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 319 - 322
Copyright
Copyright © International Astronomical Union 2009

References

Benjamin, R. A., et al. , 2003, PASP, 115, 953CrossRefGoogle Scholar
Benjamin, R. A., et al. 2005, ApJL, 630, L149Google Scholar
Binney, J. & Merrifield, M. 1998, Galactic Astronomy, Princeton Univ. Press, N.J.Google Scholar
Block, D. L. & Wainscoat, R. J. 1991, Nature, 353, 48Google Scholar
Brown, J. C., Haverkorn, M., Gaensler, B. M., et al. 2007, ApJ, 663, 258CrossRefGoogle Scholar
Burton, W. B., Elmegreen, B. G., & Genzel, R. 1992, Saas-Fee Advanced Course 21: The Galactic Interstellar Medium, Springer-VerlagGoogle Scholar
Dame, T. M., Hartmann, D., & Thaddeus, P. 2001, ApJ, 547, 792Google Scholar
Drimmel, R. 2000, A&A, 358, L13Google Scholar
Drimmel, R. & Spergel, D. N. 2001, ApJ, 556, 181Google Scholar
Elmegreen, B. G. & Elmegreen, D. M. 1986, ApJ, 311, 554Google Scholar
Englmaier, P. & Gerhard, O. 1999, MNRAS, 304, 512Google Scholar
Gerhard, O. 2002, in The Dynamics, Structure & History of Galaxies: A Workshop in Honour of Professor Ken Freeman, ASPC, 273, 73Google Scholar
Jackson, J. M., Finn, S. C., Rathborne, J. M., & Chambers, E. T. 2008, ApJ, 680, 349CrossRefGoogle Scholar
Liszt, H. S. 1985, IAU Symp No 106: The Milky Way Galaxy, Kluwer, p. 283CrossRefGoogle Scholar
Martos, M., Hernandez, X., Yáñez, M., Moreno, E., & Pichardo, B. 2004, MNRAS, 350, L47Google Scholar
McClure-Griffiths, N. M., & Dickey, J. M. 2007, ApJ, 671, 427Google Scholar
Sheth, K. et al. 2008, ApJ, 675, 1141Google Scholar
Shu, F. H., Milione, V., & Roberts, W. W. Jr., 1973, ApJ, 183, 819CrossRefGoogle Scholar