Computer Science – Graphics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.2113k&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #21.13; Bulletin of the American Astronomical Society, Vol. 32, p.701
Computer Science
Graphics
Scientific paper
We present STIS high spatial resolution long-slit spectroscopy of the nuclear region of NGC4742 as part of the STIS GTO program dedicated to understanding the demographics of supermassive central black holes in galaxies. NGC4742 is a relavely nearby (13Mpc), early-type galaxy. It was chosen as a low luminosity (MV=-19.32) candidate in the WFPC-I program to explore galaxy core structure as a function of luminosity (Lauer et al. 1995). The WFPC-I observations exhibit no flattening of the surface brightness profiles into the resolution limit of the observations. Consequently, NGC4742 has been classified as a ``power-law'' galaxy based upon its steep surface brightness profile interior to its break radius, rb=1.4" (Lauer et al. 1995, Byun et al. 1996). Using HST/STIS and KPNO/4m long-slit spectroscopy of the CaII triplet near 8600 Angstroms, we have mapped the nuclear gravitational potential in this galaxy using the Fourier Correlation Quotient method. Our data exhibit a steep velocity rise in the inner 0.2" of NGC4742 suggesting that this galaxy contains a central massive black hole. Preliminary analysis indicates that this central mass is consistent with the empirical black hole mass to bulge luminosity relation (Richstone et al. 1998). Detailed modelling of the stellar velocities using three-integral axisymmetric models (Gebhardt et al. 2000) will be employed to obtain the central mass contained within this radius. Support for this work was provided by NAS5-30403.
Bower Gary A.
Green Richard F.
Kaiser Mary Elizabeth
STIS IDT Team
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