The Milky Way Rotation Curve and Its Vertical Derivatives: Inside the Solar Circle
نویسندگان
چکیده
منابع مشابه
The Milky Way Rotation Curve and Its Vertical Derivatives inside the Solar Circle
We measure the Galactic rotation curve and its first two vertical derivatives in the first and fourth quadrants of the Milky Way using the 21 cm VGPS and SGPS. We find tangent velocities of the atomic gas as a function of galactic longitude and latitude by fitting an analytic line profile to the edges of the velocity profiles. The shape of the analytic profile depends only on the tangent veloci...
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The 87 new 0 determinations were added to the existing sample of cepheids with known radial velocities, forming an extended sample of 278 galactic classical cepheids with reliable radial velocity and photometry. We then calculated distances for these objects through a Period-Luminosity-Colour relation due to Feast & Walker (1987). The position of the cepheids in the galactic disk as given by th...
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We examine the outer Galactic HI disk for deviations from the b = 0 plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is well described by a vertical offset plus two Fourier modes of frequency 1 and 2, all of which grow with Galactocentric radius. Adding the m = 2 mode accounts for the large asymmetry between the northern and southern...
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The evolution of the Milky Way monitored in the solar
In this review we concentrate on the dynamical evolution of the Milky Way as monitored in the solar neighbourhood. The relevant data sets are presented and discussed in detail. In the second part we review various mechanisms, which drive the dynamical evolution. 1. Dynamical evolution of the galactic disk traced in the solar neighbourhood The key data set, which we use for this study, is the Fo...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/587444