Circumnuclear Keplerian Disks in Galaxies

Abstract

In this paper we demonstrate the possibility of inferring the presence of Keplerian gaseous disks using optical ground-based telescopes properly equipped. We have modeled the peculiar bidimensional shape of the emission lines in a sample of five S0-Sa galaxies as due to the motion of a gaseous disk rotating in the combined potential of a central point-like 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 Msolar. For the remaining galaxy NGC 5064 an upper limit of 5*10^7 Msolar is estimated.

11 pages, LaTeX, with 3 PostScript figures, Submitted to The Astrophysical Journal Letters

References in corpus (2)

• Kinematics of the Nuclear Ionized Gas in the Radio Galaxy M84 (NGC 4374)
• Nuclear-to-Disk Rotation Curves of Galaxies in the H_alpha and [NII] Emission Lines

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