Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243l..17m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. L17-L20.
Astronomy and Astrophysics
Astrophysics
21
Brightness Distribution, Color, Distribution (Property), Elliptical Galaxies, Accretion Disks, Astronomical Models, Galactic Structure
Scientific paper
Results are presented from high-resolution imaging of the central region of M32 in the U, B, R and 1-micron bands. The resolutions (FWHM) range from 0.60 arcsec at 1 micron to 0.92 arcsec in the U band. All images show 'pointed' isophotes within the central 5 arcsec, the deviations from ellipticity being small (maximum about 0.01) but significant, suggesting that a nuclear disk is present within the central 15 pc. No color gradient is found in either U - B nor B - R at subarcsecond resolution. An empirical model fitting the observations after convolution by the appropriate point-spread-function yields an intrinsic half width at half maximum ('core' radius) of 0.32 arcsec, a central surface brightness B = 12.65, and constant central colors (U - B = 0.56, B - R = 1.52), axis ratio (c/a = 0.71) and position angle throughout the central region (r less than 10 arcsec). The implications of these results on the formation of M32 by dissipational collapse are briefly discussed.
Michard Raymond
Nieto Jean-Luc
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