TITLE

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

AUTHOR(S)
Martinez-Valpuesta, I.; Gerhard, O.
PUB. DATE
February 2012
SOURCE
EPJ Web of Conferences;2012, Issue 19, p1
SOURCE TYPE
Conference Proceeding
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
85778888

 

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