Black Holes and Bars: A Recipe for Making Bulges?

Details Black Holes and Bars: A Recipe for Making Bulges? Black Holes and Bars: A Recipe for Making Bulges?

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9046b&link_type=abstract

HST Proposal ID #9046

Physics

Hst Proposal Id #9046 Galaxies

Scientific paper

We propose to obtain WFPC2 multi-color images and STIS emission line spectroscopy of the nuclear regions of 6 edge-on barred spiral galaxies spanning a range of bulge morphologies and bar strengths. Our goal is to quantify the amount of vertical heating in the nuclei, and to test whether or not bars are indeed destroyed and create a bulge if enough mass is accumulated in their centers. Edge-on galaxies provide a unique tool to study the structure and dynamics of barred disks rapidly and extensively, and we have already obtained extensive ground-based data for all our targets. The high spatial resolution of HST is crucial for our project as the efficiency of bar-driven processes is determined by the galaxies' nuclear properties. Our images will yield the nuclear cusp slope and will allow us to determine the conditions under which bars can survive. Color information is required to correct for internal dust extinction, identify population gradients, and evaluate the rate at which disk stars migrate into bulges. STIS will be used to probe the kinematics of the nuclear gas disks and to weigh any unresolved massive point mass {black hole}, providing a direct test of bar dissolution scenarios. We will use line-ratio diagnostics to study the physical conditions of the nuclear gas and determine the importance of bar-induced shocks and nuclear spirals for inflow.

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