نتایج جستجو برای: hα classifier
تعداد نتایج: 46785 فیلتر نتایج به سال:
We present numerical models of the circumstellar disks of Be stars, and we describe the resulting synthetic Hα emission lines and maps of the wavelengthintegrated emission flux projected onto the sky. We demonstrate that there are monotonic relationships between the emission line equivalent width and the ratio of the angular half-width at half maximum of the projected disk major axis to the rad...
We present a catalogue of candidate Hα emission and absorption line sources and blue objects in the Galactic Bulge Survey (GBS) region. We use a point source catalogue of the GBS fields (two strips of (l × b) = (6◦ × 1◦) centred at b = 1. ◦5 above and below the Galactic Centre), covering the magnitude range 16 ≤ r′ ≤ 22.5. We utilize (r′ – i′, r′ – Hα) colour–colour diagrams to select Hα emissi...
In this paper we review the present status and implications of Hα surveys at various redshifts. With the advent of sensitive wide-format near-infrared detectors on large telescopes, deep and extensive Hα surveys are now feasible to redshift z ∼ 2.5. The cosmic star formation history can therefore be traced out to this redshift using Hα alone, avoiding complications arising from the comparison o...
A spectrally selective imaging system has been installed in the RF negative ion source in the International Thermonuclear Experimental Reactor-relevant negative ion beam test facility ELISE (Extraction from a Large Ion Source Experiment) to investigate distribution of hydrogen Balmer-α emission (Hα) close to the production surface of hydrogen negative ion. We selected a GigE vision camera coupl...
We present a progress report on an ongoing Hα imaging survey of nearby clusters of galaxies. Four clusters have been surveyed to date: A1367, A1656, A347 and A569. A preliminary comparison of Hα luminosity functions obtained from our imaging survey with those from the prism survey reveals a significant level of incompleteness in the latter. This in turn is due to a combination of insensitivity ...
target tracking is the tracking of an object in an image sequence. target tracking in image sequence consists of two different parts: 1- moving target detection 2- tracking of moving target. in some of the tracking algorithms these two parts are combined as a single algorithm. the main goal in this thesis is to provide a new framework for effective tracking of different kinds of moving target...
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