Ronald L. Snell

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On 4 July 2005, many observatories around the world and in space observed the collision of Deep Impact with comet 9P/Tempel 1 or its aftermath. This was an unprecedented coordinated observational campaign. These data show that (i) there was new material after impact that was compositionally different from that seen before impact; (ii) the ratio of dust mass(More)
A summary of global properties and an evaluation of the equilibrium state of molecular regions in the outer Galaxy are presented from the decomposition of the FCRAO Outer Galaxy Survey and targeted CO and CO observations of four giant molecular cloud complexes. The ensemble of identified objects includes both small, isolated clouds and clumps within larger(More)
We analyze the embedded stellar content in the vicinity of the W3/W4/W5 H ii regions using the FCRAO Outer Galaxy CO(1–0) Survey, the IRAS Point Source Catalog, published radio continuum surveys, and new near-infrared and molecular line observations. Thirty-four IRAS Point Sources are identified that have far-infrared colors characteristic of embedded star(More)
We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 110 → 101 transition of ortho-H2O at 557 GHz in the Orion molecular cloud. H2O emission was detected in Orion over an angular extent of about 20, or nearly 3 pc. The water emission is relatively weak, with line widths (3–6 km s−1) and VLSR velocities (9–11 km s−1) consistent(More)
In order to evaluate the short term metabolic effects of gossypol on the testes as well as any possible effects on the secondary sex organs, Balb C mice were injected subcutaneously with various doses of gossypol (0.25-25.0 mg/kg body weight) in corn oil for 10 days. Wet weights of several different secondary sex reproductive organs decreased during(More)
L-idaro-1,4-lactone was synthesized by two different, published methods: (1) epimerization of monopotassium D-glucarate by refluxing in aqueous barium hydroxide, and (2) oxidation of L-iditol by heating in dilute nitric acid. The lactone, formed by heat dehydration from aqueous solution at low pH, was purified by paper chromatography, and quantitated by(More)
Context. According to traditional gas-phase chemical models, O2 should be abundant in molecular clouds, but until recently, attempts to detect interstellar O2 line emission with groundand space-based observatories have failed. Aims. Following the multi-line detections of O2 with low abundances in the Orion and ρ Oph A molecular clouds with Herschel, it is(More)
We present a survey of the distribution of 20 chemical and isotopic molecular species along the central ridge of the Orion molecular cloud from 6' north to 6' south of BN-KL observed with the QUARRY focal plane array on the FCRAO 14 m telescope, which provides an angular resolution of approximately 50" in the 3 mm wavelength region. We use standard tools of(More)
We report the results of a 100 square degree survey of the Taurus Molecular Cloud region in the J = 1 → 0 transition of CO and of CO. The image of the cloud in each velocity channel includes ' 3×10 Nyquist-sampled pixels, sampled on a 20′′ grid. The high sensitivity and large linear dynamic range of the maps in both isotopologues reveal a very complex,(More)