Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9546s&link_type=abstract
HST Proposal ID #9546
Computer Science
Hst Proposal Id #9546 Galaxies
Scientific paper
vspace*-.4cm We propose to advance the spectroscopic method of detection of nuclear bars in nested bar systems. Stellar and gaseous bars on all scales dramatically change and speed up dynamical and secular evolution of disk galaxies. Due to the lack of a clear theoretical analysis of kinematic signatures of nuclear bars and of nested bar dynamics, only photometry is currently used to search for these strongest of departures from axial symmetry in disk galaxies. This leads to an underestimate of bar fractions and seriously undermines our understanding of stability and evolution of these systems, especially on sub-kpc scales. Complete reliance on photometric studies of nuclear bars, along with theoretical `vacuum,' has also led to some erroneous results. By means of numerical study of gas and stellar dynamics in nested bar galaxies, we shall determine observational signatures of nuclear bars and will utilize available and future HST photometric and spectroscopic data, in conjunction with ground based observations. Specifically, we shall analyze and make testable predictions regarding the sense of rotation of nuclear bars, their extent with respect to the corotation radius, observed stellar velocity reversals, gas influx across the bar-bar interface, settling of the gas in the nuclear bars and distribution of shocked gas in nested bars. Nested bars can form a dynamic link between the nuclear regions and the galaxy at large. Understanding the nested bar dynamics, and gas and stellar contents, will expose their role in galactic evolution.
No associations
LandOfFree
Observational Signatures of Nested Bars in Disk Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observational Signatures of Nested Bars in Disk Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observational Signatures of Nested Bars in Disk Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-733661