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We present surface photometry for the central regions of a sample of 33early-type (E, S0, and S0/a) galaxies observed at 1.6 microns (H band) usingthe Hubble Space Telescope (HST). We employ a new technique of two-dimensionalfitting to extract quantitative parameters for the bulge light distribution andnuclear point sources, taking into consideration the effects of thepoint-spread function. Parameterizing the bulge profile with a ``Nuker'' law,we confirm that the central surface-brightness distributions largely fall intotwo categories, each of which correlates with the global properties of thegalaxies. ``Core'' galaxies tend to be luminous ellipticals with boxy or pureelliptical isophotes, whereas ``power-law'' galaxies are preferentially lowerluminosity systems with disky isophotes. Unlike most previous studies, however,we do not find a clear gap in the distribution of inner cusp slopes; severalobjects have inner cusp slopes (0.3 < gamma < 0.5) which straddle the regimesconventionally defined for core and power-law type galaxies. The nature ofthese intermediate objects is unclear. We draw attention to two objects in thesample which appear to be promising cases of galaxies with isothermal coresthat are not the brightest members of a cluster. Unresolved nuclear pointsources are found in about 50% of the sample galaxies, roughly independent ofprofile type, with magnitudes in the range m^{nuc}_H = 12.8 to 17.4 mag, whichcorrespond to M_H^{nuc} = -12.8 to -18.4 mag. (Abridged)Comment: To appear in The Astronomical Journal. Latex, 24 pages and 17 JPEG  image

the astronomical journal

Central Structural Parameters of Early-Type Galaxies as Viewed with Nicmos on the [ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL]