VELOCITY DISPERSION PROFILE OF THE MILKY WAY HALO
نویسندگان
چکیده
منابع مشابه
The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way
We have compiled a new sample of 240 halo objects with accurate distance and radial velocity measurements, including globular clusters, satellite galaxies, field blue horizontal branch stars and red giant stars from the Spaghetti survey. The new data lead to a significant increase in the number of known objects for Galactocentric radii beyond 50 kpc, which allows a reliable determination of the...
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A sample of ∼1,800 halo subdwarf stars with radial velocities and proper motions is assembled from Bramich et al.’s (2007) light-motion catalog. This is based on the repeated multi-band Sloan Digital Sky Survey photometric measurements in Stripe 82. Our sample of halo subdwarfs is extracted via a reduced proper motion diagram and distances are obtained using photometric parallaxes, thus giving ...
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The latest Sloan Digital Sky Survey data tracing the tidal stream from the Sagittarius dwarf spheroidal (dSph) reveals a bifurcation in the distribution of debris. The branching is caused by the projection of the old trailing and young leading tidal arms of the Sagittarius dSph. The angular difference between the branches is a measure of the precession of the orbital plane and hence the aspheri...
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The last 10-20 years has seen a profound shift in views of how the Galaxy’s halo formed. The idea of a monolithic early collapse of a single system (Eggen, Lynden-Bell and Sandage 1962) has been challenged by observations at high redshift and by cosmological models of structure formation. These findings imply that we should see clear evidence of hierarchical formation processes in nearby galaxi...
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Far Ultraviolet Spectroscopic Explorer (FUSE) data is used to investigate the molecular hydrogen (H2) content of intermediate-velocity clouds (IVCs) in the lower halo of the Milky Way. We analyze interstellar absorption towards 56 (mostly extragalactic) background sources to study H2 absorption in the Lymanand Werner bands in 61 IVC components at H i column densities ≥ 10 cm. For data with good...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2009
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/139/1/59