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Date and Time of the Query: 2019-08-26 T00:28:31 PDT
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For refcode 1998ApJ...509L..93B:
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Copyright by American Astronomical Society. Reproduced by permission
1998ApJ...509L..93B Circumnuclear Keplerian Disks in Galaxies FRANCESCO BERTOLA, MICHELE CAPPELLARI, JOSE G. FUNES, S.J., ENRICO M. CORSINI, ALESSANDRO PIZZELLA AND JUAN C. VEGA BELTRAN Received 1998 June 25; accepted 1998 October 20; published 1998 November 12 ABSTRACT n this Letter, we demonstrate the possibility of inferring the presence of Keplerian gaseous disks using properly equipped optical ground-based telescopes. We have modeled the peculiar bidimensional shape of the emission lines in a sample of five early-type disk galaxies as due to the motion of a gaseous disk rotating in the combined potential of a central pointlike mass and of an extended stellar disk. The value of the central mass concentration estimated for four galaxies of the sample (NGC 2179, NGC 4343, NGC 4435, and NGC 4459) is ~10^9^ M_sun_. This value, according to the assumptions made in our model, is overestimated. However, we have calculated that the effect is well within the errors. For the remaining galaxy, NGC 5064, an upper limit of 5 x 10^7^M_sun_ is estimated. Subject headings: black hole physics-galaxies: kinematics and dynamics- galaxies: nuclei-galaxies: structure
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