Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538101e&link_type=abstract
American Astronomical Society, AAS Meeting #215, #381.01; Bulletin of the American Astronomical Society, Vol. 42, p.591
Astronomy and Astrophysics
Astronomy
Scientific paper
We show that direct detection of the vertically thickened parts of bars ("boxy" or "peanut-shaped" bulges) is possible not only for edge-on galaxies but also for galaxies with moderate inclinations (i < 70 degrees), and that examples are relatively common in the nearby universe. Comparison with n-body simulations indicates that detection of the box/peanut structure is maximized when the bar's position is close to the apparent major axis of the projected disk, and minimized when it lies along the minor axis. Analysis of a sample of nearby, moderately inclined (i < 65 degrees) early-type (S0-Sb) disk galaxies shows that this signature can be detected for inclinations as low as 40 degrees -- and in rare cases down to 30 degrees. Detection of box/peanut structures in moderately inclined galaxies makes it possible to directly compare vertical and in-plane structures of disks in ways that are difficult or impossible for edge-on systems; for example, we can compare the linear size of the box/peanut structure with the size of the bar itself, and directly determine what fraction of bars have box/peanut structures.
Debattista Victor
Erwin Peter
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