The structure of M32 at red wavelengths

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Black Holes

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This contribution to the discussion is relevant to the two talks by J. Kormendyand T. Lauer about the possible presence of supermassive black holes (SBH) in the central regions of early-type galaxies. Several aspects of our work on this topic are presented in a poster at this conference (Nieto et al.). Here, we want to concentration on the SBH candidate, M32, and its non-trivial central structure, uncovered by high-resolution (FWHM-0.4-0.5 arcsec) imaging at red-near IR wavelengths (8000 A˚-1μm) at CFHT. The data show, within the 10 central arcsec, i)a slight isophotal twist, ii) strong color gradients (Figure), iii) a clumpy structure and iv) evidence for the presence of a disk. The three last points are dueto a population of AGB stars located within the central 20 arcsec and preferentially confined within a disk. A preliminary report is in Nieto et al. (1991); a more detailed discussion will be published elsewhere. These features have to be linked to the high-resolution stellar velocity map (Bacon et al., 1991 and Nieto et al., this conference). All these data infer that even in the center of M32 once believed to be a simple, structureless galaxy, complex phenomena are taking place, that require sophisticated modeling.

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