Circumnuclear Morphology in Disk

Details Circumnuclear Morphology in Disk Circumnuclear Morphology in Disk

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7982s&link_type=abstract

HST Proposal ID #7982

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #7982 Extragalactic Astrophysics

Scientific paper

We propose to study HST archival images of a large sample of disk galaxies. We specifically propose to analyze the NICMOS and WFPC2 images of circumnuclear regions in these galaxies, using 2-3 different bands. The photometry will provide us high spatial resolution information about the distribution of stars, from the near-IR light, and gas, by using dust extinction and star formation as tracers. We shall determine morphological parameters of the circumnuclear regions, such as position angles, boxiness, lopsidedness, and ellipticities of small-scale non-axisymmetries, and shall attempt to disentangle the asymmetry in the mass distribution {when appropriate} from that in the light. We shall analyze the morphological parameters statistically, by correlating them against global parameters like galaxy type, rotation velocity and central activity, but also in detail, by comparing our observed tracers for gas and stars with the predicted synthetic morphologies from the largely completed theoretical modeling by Englmaier & Shlosman of gas flows within the central kpc, i.e., between the galactic center and the inner resonance region. Results of this study will advance our understanding of the physical processes occurring on scales up to 1 kpc from the center, and guide the development of future strategies in the field.

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