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8 papers · 1 filter
UV Imaging Polarimetry of the peculiar Seyfert 2 galaxy Mrk 477
Makoto Kishimoto, Laura E. Kay, Robert Antonucci +3
We present the results of UV imaging polarimetry of the Seyfert 2 galaxy Mrk 477 taken by the Faint Object Camera onboard the Hubble Space Telescope (HST). From a previous HST UV i…
UV Imaging Polarimetry of the Seyfert 2 Galaxy Mrk 3
Makoto Kishimoto, Laura E. Kay, Robert Antonucci +3
We present UV imaging polarimetry data of the Seyfert 2 galaxy Mrk 3 taken by the Hubble Space Telescope. The polarized flux is found to be extended to ~1 kpc from the nucleus, and…
The Orevkov invariant of an affine plane curve
Walter D. Neumann, Paul Norbury
We show that although the fundamental group of the complement of an algebraic affine plane curve is not easy to compute, it possesses a more accessible quotient, which we call the…
Universal abelian covers of surface singularities
Walter D. Neumann, Jonathan Wahl
We discuss the evidence for and implications of a conjecture that the universal abelian cover of a Q-Gorenstein surface singularity with finite local homology (i.e., the singularit…
A Composite Seyfert 2 X-ray Spectrum: Implications for the Origin of the Cosmic X-ray Background
Edward C. Moran, Laura E. Kay, Marc Davis +2
We present a composite 1-10 keV Seyfert 2 X-ray spectrum, derived from ASCA observations of a distance-limited sample of nearby galaxies. All 29 observed objects were detected. Abo…
Towards an implementation of the B-H algorithm for recognizing the unknot
J. S. Birman, P. Boldi, M. Rampichini +1
In their paper `A new algorithm for recognizing the unknot', in Geometry and Topology', 2 (1998) n. 9, 175-220, the first author and Michael Hirsch presented a then new algorithm f…