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- W2048911285 abstract "We discuss Hubble Space Telescope (HST) optical images and spectra of NGC 6251, a giant E2 galaxy and powerful radio source at a distance of 106 Mpc (for H0=70 km s-1 Mpc-1). The galaxy is known to host a very well-defined dust disk; the exceptional resolution of our V and I images allows a detailed study of the disk structure. Furthermore, narrowband images centered on the Hα + [N II] emission lines reveal the presence of ionized gas in the inner 03 of the disk. We used the HST Faint Object Spectrograph with the 009 aperture to study the velocity structure of the disk. Dynamical models were constructed for two extreme (in terms of central concentration) analytical representations of the stellar surface brightness profile, from which the mass density and corresponding rotational velocity are derived assuming a constant mass-to-light ratio (M/L)V~8.5 M☉/L☉. For both representations of the stellar component, the models show that the gas is in Keplerian motion around a central mass ~4-8×108 M☉ and that the contribution of radial flows to the velocity field is negligible." @default.
- W2048911285 created "2016-06-24" @default.
- W2048911285 creator A5003436132 @default.
- W2048911285 creator A5083572056 @default.
- W2048911285 date "1999-04-20" @default.
- W2048911285 modified "2023-10-17" @default.
- W2048911285 title "Nuclear Disks of Gas and Dust in Early‐Type Galaxies and the Hunt for Massive Black Holes:<i>Hubble Space Telescope</i>Observations of NGC 6251" @default.
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- W2048911285 doi "https://doi.org/10.1086/307046" @default.
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