Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1793k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1793-1812, 2013.
Astronomy and Astrophysics
Astronomy
95
Astronomical Photography, Astronomical Photometry, Black Holes (Astronomy), Galactic Nuclei, Galactic Structure, Globular Clusters, Data Reduction, Elliptical Galaxies, Local Group (Astronomy), Mass To Light Ratios
Scientific paper
The semistellar nucleus of M33 was observed with high resolution surface photometry and velocity dispersion measurements in order to study its structure and to search for a central black hole. Imagery was obtained by using the DAO/CFHT HR camera. The nucleus is unresolved, and its true core radius is r(c) not greater than about 0.10 arcsec. The true central surface brightness is mu not greater than about 11.3 R mag/sq arcsec, and the central density is rho(0) not less than about than 5 x 10 exp 5 solar masses/cubic pc. The velocity dispersion, rho equal to 21 plus or minus 3 km s/exp 1, of the nucleus was measured using the Ca II infrared triplet. The mass to light ratio is small approximately less than 0.4. There is a substantial color gradient inside the 0.5 arcsec radius. These observations suggest that the nucleus contains young stars concentrated in the center. A strict limit is derived on the mass of a central black hole, implying that we can rule out the presence of a dead quasar in M33.
Kormendy John
McClure Robert D.
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