Hostname: page-component-76fb5796d-r6qrq Total loading time: 0 Render date: 2024-04-26T16:42:46.600Z Has data issue: false hasContentIssue false

A secularly evolved model for the Milky Way bar and bulge

Published online by Cambridge University Press:  05 March 2015

Inma Martinez-Valpuesta
Affiliation:
Max Planck Institute for Extraterrestrial Physics, 85748, Garching, Germany email: imv@mpe.mpg.de
Ortwin Gerhard
Affiliation:
Max Planck Institute for Extraterrestrial Physics, 85748, Garching, Germany email: imv@mpe.mpg.de
Rights & Permissions [Opens in a new window]

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.

Bars are strong drivers of secular evolution in disk galaxies. Bars themselves can evolve secularly through angular momentum transport, producing different boxy/peanut and X-shaped bulges. Our Milky Way is an example of a barred galaxy with a boxy bulge. We present a self-consistent N-body simulation of a barred galaxy which matches remarkably well the structure of the inner Milky Way deduced from star counts. In particular, features taken as signatures of a second “long bar“ can be explained by the interaction between the bar and the spiral arms of the galaxy (Martinez-Valpuesta & Gerhard 2011). Furthermore the structural change in the bulge inside l = 4° measured recently from VVV data can be explained by the high-density near-axisymmetric part of the inner boxy bulge (Gerhard & Martinez-Valpuesta 2012). We also compare this model with kinematic data from recent spectroscopic surveys. We use a modified version of the NMAGIC code (de Lorenzi et al. 2007) to study the properties of the Milky Way bar, obtaining an upper limit for the pattern speed of ~ 42 km/sec/kpc. See Fig. 1 for a comparison of one of our best models with BRAVA data (Kunder et al. 2012).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

de Lorenzi, F., Debattista, V. P., Gerhard, O., & Sambhus, N. 2007, MNRAS, 376, 71CrossRefGoogle Scholar
Kunder, A., Koch, A., Rich, R. M., et al. 2012, AJ, 143, 57Google Scholar
Gerhard, O. & Martinez-Valpuesta, I. 2012, ApJ, 744, L8CrossRefGoogle Scholar
Martinez-Valpuesta, I. & Gerhard, O. 2011, ApJ, 734, L20Google Scholar