130,775 research outputs found
The Deep SWIRE Field III. WIYN Spectroscopy
We present the results of spectroscopy using HYDRA on the WIYN 3.5m telescope
of objects in the deep SWIRE radio field. The goal of the project was to
determine spectroscopic redshifts for as many of the brighter objects in the
field as possible, especially those detected in the radio and at 24 microns.
These redshifts are primarily being used in studies of galaxy evolution and the
connection of that evolution to AGN and star-formation. Redshifts measured for
365 individual objects are reported. The redshifts range from 0.03 to 2.5,
mostly with z < 0.9. The sources were selected to be within the WIYN HYDRA
field of approximately 30' in radius from the center of the SWIRE deep field,
10h46m00s, 59d 01'00" (J2000). Optical sources for spectroscopic observation
were selected from a r-band image of the field. A priority list of
spectroscopic targets was established in the following order: 20cm detections,
24 micron detections, galaxies with r < 20 and the balance made up of fainter
galaxies in the field. We provide a table listing the galaxy positions,
measured redshift and error, and note any emission lines that were visible in
the spectrum. In practice almost all the galaxies with r < 19 were observed
including all of the radio sources and most of the 24 microns sources with r <
20 and a sample of radio sources which had fainter optical counterparts on the
r-band image.Comment: 6 pages, 3 tables, 2 figures, full electronic tables at
http://www.aoc.nrao.edu/~fowen/papers/SWIRE/WIYNpaper3/, accepted ApJ Suppl
Serie
Interaction between electronic structure and strain in Bi nanolines on Si(001)
Heteroepitaxial strain can be a controlling factor in the lateral dimensions
of 1-D nanostructures. Bi nanolines on Si(001) have an atomic structure which
involves a large sub-surface reconstruction, resulting in a strong elastic
coupling to the surrounding silicon. We present variable-bias STM and first
principles electronic structure calculations of the Bi nanolines, which
investigates this interaction. We show that the strain associated with the
nanolines affects the atomic and electronic structure of at least two
neighbouring Si dimers, and identify the mechanism behind this. We also present
partial charge densities (projected by energy) for the nanoline with clean and
hydrogenated surroundings and contrast it to the clean Si(001) surface.Comment: 10 pages, 3 figures, submitted to Surface Scienc
Review of \u3cem\u3e Plato\u27s Sophist\u3c/em\u3e by Eva Brann, Peter Kalkavage, and Eric Salem
Review of \u3cem\u3e Aristotle as Teacher: His Introduction to a Philosophical Science\u3c/em\u3e by Christopher Bruell
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