Nuclear Dynamics of NGC 205: Probing the Low-Mass End of the M-sigma Relation

Details Nuclear Dynamics of NGC 205: Probing the Low-Mass End of the M-sigma Relation Nuclear Dynamics of NGC 205: Probing the Low-Mass End of the M-sigma Relation

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9448f&link_type=abstract

HST Proposal ID #9448

Computer Science

Hst Proposal Id #9448

Scientific paper

In 1994, HST produced the first detection of a supermassive black hole, of a few billion M{sun}, in a galactic nucleus. That discovery marked the beginning of a new era for black hole studies. Today, the firm, dynamical detection of an intermediate mass black hole, one with 10^2 < mh< 10^6 M{sun}, would have an equally profound impact. No such detection exists. NGC 205 is the only galaxy in which one can be attempted. We propose to obtain for NGC 205 the most complete dataset available for any galaxy targeted by HST for similar studies. Eleven orbits with STIS will provide the kinematical information. One orbit with NIC1/F160W { H} will produce a surface brightness profile at 0Sec1 resolution. Variations of mass-to-light-ratio with age are minimized in the near IR, reducing the potential of biasing the deprojected mass density. Two orbits with ACS/HRC/F555W and F814W { V and I}, at twice the NIC1 resolution, will allow us to quantify the broadening introduced by the NICMOS PSF in the H-band brightness profile. Furthermore, they will resolve the nucleus into individual stars: with the aid of a color magnitude diagram, stellar populations differing in age and/or metallicity can be identified, and an independent estimate of the mass density can be derived directly for each. To give all competing groups a fair chance of analyzing the data in a timely fashion, we ask for a reduced, three month proprietary period.

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