Rotation Curve and Mass Distribution in the Galactic Center - From Black Hole to Entire Galaxy
By Y. Sofue. 2013
166 citations recorded by the source corpus.
Analyzing high-resolution longitude-velocity (LV) diagrams of the Galactic Center observed with the Nobeyama 45-m telescope in the CO and CS line emissions, we obtain a central rotation curve of the Milky Way. We combine it with the data for the outer disk, and construct a logarithmic rotation curve of the entire Galaxy. The new rotation curve covers a wide range of radius from r ∼ 1 pc to several hundred kpc without a gap of data points. It links, for the first time, the kinematical characteristics of the Galaxy from the central black hole to the bulge, disk and dark halo. Using this grand rotation curve, we calculate the radial distribution of surface mass density in the entire Galaxy, where the radius and derived mass densities vary over a dynamical range with several orders of magnitudes. We show that the galactic bulge is deconvolved into two components: the inner (core) and main bulges. Both the two bulge components are represented by exponential density profiles, but the de Vaucouleurs law was found to fail in representing the mass profile of the galactic bulge.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/083acc4cb208ef2258f00bd1e11510948ac88831
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In Astronomy and Astrophysics
Citations in the corpus
- On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk (2014, result): “In passingwe note that current finding, once confirmed by independent stellar tracers, supports the suggestion brought forward by Sofue et al. (2009) and by Sofue (2013) that the dip in the rotation curve RG ∼9.0–9.5 is caused by a massive ring associated with the Perseus arm.”
- The distribution of dark matter in galaxies (2018, background): “The mass model of the MW is that of any other spiral: it includes a central bulge, a stellar disk, an extended gaseous disk and all these components are embedded in a spherical dark halo (see Caldwell and Ostriker 1981; Catena and Ullio 2010; Nesti and Salucci 2013; Sofue 2013).”
- Mean proper motions, space orbits, and velocity dispersion profiles of Galactic globular clusters derived fromGaiaDR2 data (2018, background): “The total mass of the Galactic bulge and halo is however still an order of magnitude higher (Sofue 2013; Irrgang et al. 2013; Bland-Hawthorn & Gerhard 2016).”