Unifying the planar bar and the boxy bulge of the Milky Way

Details Unifying the planar bar and the boxy bulge of the Milky Way Unifying the planar bar and the boxy bulge of the Milky Way

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012epjwc..1906010m&link_type=abstract

Assembling the Puzzle of the Milky Way, Le Grand-Bornand, France, Edited by C. Reylé; A. Robin; M. Schultheis; EPJ Web of Confer

Computer Science

Scientific paper

For some time the Milky Way has been understood as a barred disk galaxy. Star count observations have provided evidence for two bars at apparently different orientations, the boxy bulge and a long planar bar. We report recent work in which we argued for a scenario where these observations can be reproduced with a single boxy bulge/bar: an evolved bar from the stellar disk and the corresponding boxy bulge generated from it through secular evolution and buckling instability. We calculated the star count distributions along different lines-of-sight for a simulated barred galaxy and an observer at the Sun position, and compared them with observations of red clump magnitude distributions. We found a good agreement between the model and the observations, even though the simulation has a single boxy bulge/bar. In this model, the different apparent orientations of the boxy bulge and planar bar are partially due to the volume effect and partially to the leading ends of the bar.

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