Testing the Stellar Dynamics of Nested Bars in NGC 5728

Details Testing the Stellar Dynamics of Nested Bars in NGC 5728 Testing the Stellar Dynamics of Nested Bars in NGC 5728

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8123s&link_type=abstract

HST Proposal ID #8123

Physics

Hst Proposal Id #8123 Galaxy Structure And Dynamics

Scientific paper

NIR images of the barred galaxy NGC 5728 revealed the existence of an inner bar, twisted by a large angle, sim63^degrees relative to the primary bar. Similar bars within bars have been found in nearby galaxies, their existence in large numbers is of interest to understanding of barred galaxy dynamics and of the fueling of nuclear starbursts and AGNs. Three theoretical schemes were developed to explain this phenomena. Two require the gas self-gravity to stabilize the inner bar and have it rotating in the same direction as the primary bar at the same pattern speed or decoupled, so it rotates faster. The third supposes that the inner bar is decoupled but counter rotates relative to the primary, and alleviates the need for large gas masses required by the former models. The predicted rotational properties and velocity dispersion radial profiles of inner bars are radically different in all three cases and can be tested using longslit absorption-line spectroscopy. As yet no meaningful confrontation between the models and real galaxies was carried out, as inner bars are confined to small physical {1 kpc} and angular scales {5-7^''} and can only be well resolved with HST. We propose to acquire absorption-line spectra along the inner bar of NGC 5728 with STIS and the G750M grating at the Calcium triplet {Lambda 8498, 8542, 8662} to study its stellar dynamics. Our results will be significant in understanding host galaxy-to-central activity connection.

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