منابع مشابه
Supernova pencil beam survey
Type Ia supernovae (SNe Ia) can be calibrated to be good standard candles at cosmological distances. However, at z > ∼ 1, gravitational lensing leads to significant level of noise in a SN Hubble diagram. We propose a pencil beam survey of SNe Ia which would yield a significant number of SNe in redshift bins of 0.1 for z up to 2. The SN number count can provide a direct probe of cosmology which ...
متن کاملKeck Pencil-beam Survey for Faint Kuiper Belt Objects
We present the results of a pencil-beam survey of the Kuiper Belt using the Keck 10-m telescope. A single 0.01 square degree field is imaged 29 times for a total integration time of 4.8 hr. Combining exposures in software allows the detection of Kuiper Belt Objects (KBOs) having visual magnitude mV ∼< 27.9. Two new KBOs are discovered. One object having mV = 25.5 lies at a probable heliocentric...
متن کاملParallel Pencil-Beam Redefinition Algorithm
The growing sophistication in radiation treatment strategies requires the utilization of increasingly accurate, but computationally intense, dose algorithms, such as the electron pencil-beam redefinition algorithm (PBRA). The sequential implementation of the PBRA is in production use at the MD Anderson Cancer center. The PBRA is difficult to parallelize because of the large amounts of data invo...
متن کاملPencil - Beam Searches for Faint
Motivated by a desire to understand the size distribution of objects in the Kuiper belt, an observing program has been conducted at the CFHT and Palomar 5-m telescopes. We have conducted pencil-beam searches for outer solar system objects to a limiting magnitude of R 26. Fields were searched using software recombinations of many short exposures shifted at diierent angular rates in order to dete...
متن کاملGolden beam data for proton pencil-beam scanning.
Proton, as well as other ion, beams applied by electro-magnetic deflection in pencil-beam scanning (PBS) are minimally perturbed and thus can be quantified a priori by their fundamental interactions in a medium. This a priori quantification permits an optimal reduction of characterizing measurements on a particular PBS delivery system. The combination of a priori quantification and measurements...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/308500