Fundamentals of Photometry

Conjugateplane photometry: reducing scintillation in groundbased photometry

High-precision fast photometry from ground-based observatories is a challenge due to intensity fluctuations (scintillation) produced by the Earth’s atmosphere. Here we describe a method to reduce the effects of scintillation by a combination of pupil reconjugation and calibration using a comparison star. Because scintillation is produced by high-altitude turbulence, the range of angles over whi...

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Photometry of Abell 2390

We present the results of a search for strong Hα emission line galaxies (rest frame equivalent widths greater than 50Å) in the z ≈ 0.23 cluster Abell 2390. The survey contains 1189 galaxies over 270 ⊓⊔′, and is 50% complete at Mr ≈ −17.5 + 5 log h. The fraction of galaxies in which Hα is detected at the 2σ level rises from 0.0 in the central regions (excluding the cD galaxy) to 12.5±8% at R200....

Fundamentals of Restricted-orientation Convexity Fundamentals of Restricted-orientation Convexity

A restricted-orientation convex set, also called an O-convex set, is a set of points whose intersection with lines from some xed set is empty or connected. The notion of O-convexity generalizes standard convexity and orthogonal convexity. We explore some of the basic properties of O-convex sets in two and higher dimensions. We also study O-connected sets, which are restricted O-convex sets with...