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4 papers · 1 filter
Neutral Hydrogen Mapping of Virgo Cluster Blue Compact Dwarf Galaxies
G. L. Hoffman, N. Brosch, E. E. Salpeter +1
A new installment of neutral hydrogen mappings of Blue Compact Dwarf galaxies, as defined by optical morphology, in and near the Virgo cluster is presented. The primary motivation…
Algebraic K-theory of mapping class groups
Ethan Berkove, Daniel Juan-Pineda, Qin Lu
We prove that the Fibered Isomorphism Conjecture of T. Farrell and L. Jones holds for various mapping class groups. In many cases, we explicitly calculate the lower algebraic K-gro…
Combinatorial conditions that imply word-hyperbolicity for 3-manifolds
Murray Elder, Jon McCammond, John Meier
Thurston conjectured that a closed triangulated 3-manifold in which every edge has degree 5 or 6, and no two edges of degree 5 lie in a common 2-cell, has word-hyperbolic fundament…
Doppler Modulation of X-ray lines in Cygnus X-3
Michael J. Stark, Malinda Saia
We measured Doppler shifts of three bright spectral lines in the X-ray emission from Cygnus X-3 as recorded by the Chandra X-Ray Observatory. Doppler shifts of lines associated wit…