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- National Radio Astronomy ObservatoryUS83 papers
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8 papers · 1 filter
Radiative lifetime measurements of rubidium Rydberg states
Drew B. Branden, Tamas Juhasz, Tatenda Mahlokozera +5
We have measured the radiative lifetimes of ns, np and nd Rydberg states of rubidium in the range 28 < n < 45. To enable long-lived states to be measured, our experiment uses slow-…
The faint outer regions of the Pegasus Dwarf Irregular galaxy: a much larger and undisturbed galaxy
Alexei Kniazev, Noah Brosch, G. Lyle Hoffman +3
We investigate the spatial extent and structure of the Pegasus dwarf irregular galaxy using deep, wide-field, multicolour CCD photometry from the Sloan Digital Sky Survey (SDSS) an…
Perfect Parallelepipeds Exist
Jorge F. Sawyer, Clifford A. Reiter
There are parallelepipeds with edge lengths, face diagonal lengths and body diagonal lengths all positive integers. In particular, there is a parallelepiped with edge lengths 271,…
The Arecibo Legacy Fast ALFA Survey: VIII. HI Source Catalog of the Anti-Virgo Region at dec = +25 deg
Ann Martin, Riccardo Giovanelli, Martha P. Haynes +4
We present a fourth catalog of HI sources from the Arecibo Legacy Fast ALFA (ALFALFA) Survey. We report 541 detections over 136 deg2, within the region of the sky having 22h < R.A.…
A bracket polynomial for graphs. III. Vertex weights
Lorenzo Traldi
In earlier work the Kauffman bracket polynomial was extended to an invariant of marked graphs, i.e., looped graphs whose vertices have been partitioned into two classes (marked and…
A bracket polynomial for graphs. II. Links, Euler circuits and marked graphs
Lorenzo Traldi
Let be an oriented classical or virtual link diagram with directed universe . Let denote a set of directed Euler circuits, one in each connected component of .…