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Date and Time of the Query: 2019-06-24 T10:19:52 PDT
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For refcode 1998AJ....115.2306C:
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Copyright by American Astronomical Society. Reproduced by permission
1998AJ....115.2306C SPIRAL GALAXIES WITH WFPC2. III. NUCLEAR CUSP SLOPES C. M. CAROLLO Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 AND M. STIAVELLI Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 Received 1997 December 18; revised 1998 February 25 ABSTRACT In this paper, the third of a series dedicated to the investigation of the nuclear properties of spiral galaxies, we (1) model the Wide Field Planetary Camera 2 F606W nuclear surface brightness profiles of 41 spiral galaxies presented in Papers I and II with the analytic law introduced by Lauer et al. and (2) deconvolve these surface brightness profiles and their analytic fits, so as to estimate the nuclear stellar densities of bulges of spiral galaxies. We find that the nuclear stellar cusps (quantified by the average logarithmic slope of the surface brightness profiles within 0.1"- 0.5") are significantly different for R1/4 law and exponential bulges. The former have nuclear properties similar to those of early-type galaxies, i.e., similar values of nuclear cusps for comparable luminosities, and increasingly steeper stellar cusps with decreasing luminosity. By contrast, exponential bulges have (underlying the light contribution from photometrically distinct, central compact sources) comparatively shallower stellar cusps, and likely lower nuclear densities, than R^1/4^ law bulges. Key words: galaxies: fundamental parameters-galaxies: nuclei -galaxies: spiral-galaxies: structure
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