The formation of bulges of spiral galaxies: Central visual-infrared color gradients

Details The formation of bulges of spiral galaxies: Central visual-infrared color gradients The formation of bulges of spiral galaxies: Central visual-infrared color gradients

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7450p&link_type=abstract

HST Proposal ID #7450

Computer Science

Hst Proposal Id #7450 Galaxies

Scientific paper

We propose to obtain high-resolution optical and NIR images for a complete sample of bulges of spiral galaxies. Data from NICMOS and WFPC2 will allow us to derive color and luminosity distributions in galactic bulges for radii as small as 10 pc. The sample consists of bulges of bright early-type spirals, with inclinations above 50 degrees, that allow us to see at least one side of the bulge unobscured by the disk. This sample has been extensively studied by us from the ground. We have analyzed the optical and NIR color distributions, as well as surface brightness profiles. We now wish to extend our study of the surface brightness and colors to the innermost parts of bulges, and increase our radial range considerably, down to an inner radius of a few parsecs. The color profiles will be used to determine the metallicity and age gradient in the inner regions. The color maps will provide useful information on the presence of nuclear disks. The color of the central region will be useful in detecting signature remnants of formation processes such as starbursts and merger-induced accretion. The surface brightness profile in H, unaffected by dust extinction effects, will provide interesting constraints on models of bulge formation. Finally, we will be able to determine the morphology in the radial range 10--100 pc, and to obtain statistical data on the presence of inner disks and bars.

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