Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5512f&link_type=abstract
HST Proposal ID #5512
Other
Hst Proposal Id #5512 Galaxies &Amp, Clusters Nuclei/Cores
Scientific paper
We propose to continue a comprehensive study of cores of early-type galaxies. In Cycles 4 and 5, our aims are 1) FOS spectroscopy to look for supermassive black holes (BHs) and 2) imaging to follow up on new puzzles revealed by our Cycle 1 and 2 observations. Our BH search was approved in Cycle 1 but was postponed because of spherical aberration. FOS spectra will be used to determine velocity-dispersions and rotation profiles along the major axes of four prime BH candidates. Dynamical models will be constructed using an improved maximum-entropy algorithm. If BHs are present as suggested by ground based work, we should find velocities of ~400 km/s and M/L >> 100 at r < 15 pc. PC images in V and I are proposed for all spectroscopy targets and for 6 other early-type galaxies covering a wide variety of core types, as found in Cycles 1 and 2. Using the extra-sharp and stable resolution of the refurbished HST, we will measure nuclear color gradients and search for nuclear clusters, multiple nuclei, and nuclear cusps around possible BHs. These phenomena provide key tests of popular hypotheses for the formation of cores. Our Cycle 1 and 2 imaging survey has revealed several surprises. Almost no galaxies were found with constant-brightness cores. A possible correlation with isophote shape suggests there may be two distinct kinds of ellipticals. And several bulges were discovered with surprisingly indistinct nuclei. The imaging part of our program is aimed to clarify these and other issues.
No associations
LandOfFree
Cores of Early-Type Galaxies, Part II 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 Cores of Early-Type Galaxies, Part II, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cores of Early-Type Galaxies, Part II will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-819685