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Methods on Defining the Center and Spatial Analysis of the Orion Nebula Cluster
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 Material Information
Title: Methods on Defining the Center and Spatial Analysis of the Orion Nebula Cluster
Series Title: Journal of Undergraduate Research
Physical Description: Serial
Language: English
Creator: Jaehnig, Karl
Tan, Jonathan ( Mentor )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 2010
Abstract: Using observational data from the Chandra Orion Ultradeep Project (COUP), we develop and refine methods by which a center can be defined through a robust process that removes the bias in arbitrarily choosing a center. In previous research, most massive O type star, θ 1 Ori C, has been used as the center for analyses on the Orion Nebula Cluster (ONC). The new center, which is defined from the final method, is slightly above θ 1 Ori C, at R.A. =83.8157 and DEC=-5.37905. Using this new center, spatial analyses are developed and applied to the ONC in order to give some method of spherocity, as current theories on nebular dynamical evolution predict that the ONC is spherical towards the center, more so because of its relatively young age of 1Myr. Linearization was used with a divided cluster and compared with the total distribution, and statistical tests give a measure of probability that the section belongs to the whole. Linearization as a function and radii and angle reveal contradicting conclusions, with the center becoming more aspherical with the radial linearization and the angular linearization revealing that the center becomes more spherical, in line with current theories.
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Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
System ID: UF00091523:00581

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