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22 results on '"Morgan, Douglas L."'

1. Statistical Characterization of the Chandra Source Catalog

Author

Primini, Francis A., Houck, John C., Davis, John E., Nowak, Michael A., Evans, Ian N., Glotfelty, Kenny J., Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs II, Danny G., Grier, John D., Hain, Roger M., Hall, Diane M., Harbo, Peter N., Xiangqun, He, Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, McCollough, Michael L., McDowell, Jonathan C., Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Plummer, David A., Refsdal, Brian L., Rots, Arnold H., Siemiginowska, Aneta, Sundheim, Beth A., Tibbetts, Michael S., Van Stone, David W., Winkelman, Sherry L., and Zografou, Panagoula

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The first release of the Chandra Source Catalog (CSC) contains ~95,000 X-ray sources in a total area of ~0.75% of the entire sky, using data from ~3,900 separate ACIS observations of a multitude of different types of X-ray sources. In order to maximize the scientific benefit of such a large, heterogeneous data-set, careful characterization of the statistical properties of the catalog, i.e., completeness, sensitivity, false source rate, and accuracy of source properties, is required. Characterization efforts of other, large Chandra catalogs, such as the ChaMP Point Source Catalog (Kim et al. 2007) or the 2 Mega-second Deep Field Surveys (Alexander et al. 2003), while informative, cannot serve this purpose, since the CSC analysis procedures are significantly different and the range of allowable data is much less restrictive. We describe here the characterization process for the CSC. This process includes both a comparison of real CSC results with those of other, deeper Chandra catalogs of the same targets and extensive simulations of blank-sky and point source populations., Comment: To be published in the Astrophysical Journal Supplement Series (Fig. 52 replaced with a version which astro-ph can convert to PDF without issues.)

Published
2011
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2. The Chandra Source Catalog

Author

Evans, Ian N., Primini, Francis A., Glotfelty, Kenny J., Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs II, Danny G., Grier, John D., Hain, Roger M., Hall, Diane M., Harbo, Peter N., Xiangqun, He, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, McCollough, Michael L., McDowell, Jonathan C., Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Rots, Arnold H., Siemiginowska, Aneta, Sundheim, Beth A., Tibbetts, Michael S., Van Stone, David W., Winkelman, Sherry L., and Zografou, Panagoula

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Chandra Source Catalog (CSC) is a general purpose virtual X-ray astrophysics facility that provides access to a carefully selected set of generally useful quantities for individual X-ray sources, and is designed to satisfy the needs of a broad-based group of scientists, including those who may be less familiar with astronomical data analysis in the X-ray regime. The first release of the CSC includes information about 94,676 distinct X-ray sources detected in a subset of public ACIS imaging observations from roughly the first eight years of the Chandra mission. This release of the catalog includes point and compact sources with observed spatial extents <~ 30''. The catalog (1) provides access to the best estimates of the X-ray source properties for detected sources, with good scientific fidelity, and directly supports scientific analysis using the individual source data; (2) facilitates analysis of a wide range of statistical properties for classes of X-ray sources; and (3) provides efficient access to calibrated observational data and ancillary data products for individual X-ray sources, so that users can perform detailed further analysis using existing tools. The catalog includes real X-ray sources detected with flux estimates that are at least 3 times their estimated 1 sigma uncertainties in at least one energy band, while maintaining the number of spurious sources at a level of <~ 1 false source per field for a 100 ks observation. For each detected source, the CSC provides commonly tabulated quantities, including source position, extent, multi-band fluxes, hardness ratios, and variability statistics, derived from the observations in which the source is detected. In addition to these traditional catalog elements, for each X-ray source the CSC includes an extensive set of file-based data products that can be manipulated interactively., Comment: To appear in The Astrophysical Journal Supplement Series, 53 pages, 27 figures

Published
2010
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5. Aboriginal philosophy and its impact on health care outcomes

Author

Morgan, Douglas L., Slade, Malcolm D., and Morgan, Catherine M.A.

Subjects
Community health services -- Planning, Indigenous peoples -- Health aspects, Australian aborigines -- Beliefs, opinions and attitudes, Medical care -- Social aspects, Ethnicity -- Health aspects, Cross-cultural orientation -- Health aspects, Health
Abstract

The impact of Aboriginal philosophy on health and health care outcomes in Australia has been studied. Changes in treatment settings and methods can contribute to improvements in health care outcomes for these people if the changes are based on their views and philosophy. Beliefs about knowledge, shame and identity are the focus because key differences between Aboriginal and European thinking can be seen in these areas. Varied cultural contexts for these key differences are important and should not be ignored, but isolating these differences is necessary for an objectified study.

Published
1997

6. TGCat : THE CHANDRA TRANSMISSION GRATING DATA CATALOG AND ARCHIVE

Author

MIT Kavli Institute for Astrophysics and Space Research, Huenemoerder, David P., Dewey, Dan, Nowak, Michael A., Schulz, Norbert S., Davis, John E., Houck, John C., Marshall, Herman Lee, Noble, Michael S., Canizares, Claude R., Mitschang, Arik W., Nichols, Joy S., Morgan, Douglas L., MIT Kavli Institute for Astrophysics and Space Research, Huenemoerder, David P., Dewey, Dan, Nowak, Michael A., Schulz, Norbert S., Davis, John E., Houck, John C., Marshall, Herman Lee, Noble, Michael S., Canizares, Claude R., Mitschang, Arik W., Nichols, Joy S., and Morgan, Douglas L.

Abstract

The Chandra Transmission Grating Data Archive and Catalog (TGCat) provides easy access to analysis-ready products, specifically, high-resolution X-ray count spectra and their corresponding calibrations. The web interface makes it easy to find observations of a particular object, type of object, or type of observation; to quickly assess the quality and potential usefulness of the spectra from pre-computed summary plots; or to customize a view with an interactive plotter, optionally combining spectra over multiple orders or observations. Data and responses can be downloaded as a package or as individual files, and the query results themselves can be retrieved as ASCII or Virtual Observatory tables. Portable reprocessing scripts used to create the archive and which use the Chandra X-ray Center's (CXC's) software and other publicly available software are also available, facilitating standard or customized reprocessing from Level 1 CXC archival data to spectra and responses with minimal user interaction.

Published
2015

7. THE CHANDRA VARIABLE GUIDE STAR CATALOG

Author

MIT Kavli Institute for Astrophysics and Space Research, Huenemoerder, David P., Nichols, Joy S., Henden, Arne A., Lauer, Jennifer L., Martin, Eric, Morgan, Douglas L., Sundheim, Beth A., MIT Kavli Institute for Astrophysics and Space Research, Huenemoerder, David P., Nichols, Joy S., Henden, Arne A., Lauer, Jennifer L., Martin, Eric, Morgan, Douglas L., and Sundheim, Beth A.

Abstract

Variable stars have been identified among the optical-wavelength light curves of guide stars used for pointing control of the Chandra X-ray Observatory. We present a catalog of these variable stars along with their light curves and ancillary data. Variability was detected to a lower limit of 0.02 mag amplitude in the 4000-10000 Å range using the photometrically stable Aspect Camera on board the Chandra spacecraft. The Chandra Variable Guide Star Catalog (VGUIDE) contains 827 stars, of which 586 are classified as definitely variable and 241 are identified as possibly variable. Of the 586 definite variable stars, we believe 319 are new variable star identifications. Types of variables in the catalog include eclipsing binaries, pulsating stars, and rotating stars. The variability was detected during the course of normal verification of each Chandra pointing and results from analysis of over 75,000 guide star light curves from the Chandra mission. The VGUIDE catalog represents data from only about 9 years of the Chandra mission. Future releases of VGUIDE will include newly identified variable guide stars as the mission proceeds. An important advantage of the use of space data to identify and analyze variable stars is the relatively long observations that are available. The Chandra orbit allows for observations up to 2 days in length. Also, guide stars were often used multiple times for Chandra observations, so many of the stars in the VGUIDE catalog have multiple light curves available from various times in the mission. The catalog is presented as both online data associated with this paper and as a public Web interface. Light curves with data at the instrumental time resolution of about 2 s, overplotted with the data binned at 1 ks, can be viewed on the public Web interface and downloaded for further analysis. VGUIDE is a unique project using data collected during the mission that would otherwise be ignored. The stars available for use as Chandra guide stars are genera, United States. National Aeronautics and Space Administration (Smithsonian Astrophysical Observatory. Contract NAS8-03060), United States. National Aeronautics and Space Administration (Smithsonian Astrophysical Observatory. Contract SV3-73016)

Published
2015

8. Mixed mode assessment: a preliminary evaluation

Author

Morgan, Douglas L

Subjects
Aboriginal peoples, Higher education, Education
Abstract

This paper examines the usefulness of a combination of self, peer and tutor (mixed mode) assessment of group presentations for promoting deep learning and enhancing the learning experience of students undertaking the first year topic Aust 1004 - An Introduction to Aboriginal Studies, part of the Indigenous minor at Flinders University. It discusses the relative advantages and disadvantages of the three assessment processes and argues that a combination of all three can create an environment to promote deep learning. It evaluates the experiences of 25 first year students using this process and finds that deep learning is enhanced by mixed mode assessment.

Published
2001

9. Indigenous Health: A Special Moral Imperative

Author

Morgan, Douglas L. and Allen, Rodney J.

Subjects
Australian aborigines -- Health aspects, Ethics -- Evaluation, Community health services -- Demographic aspects, Medical care -- Finance, Health
Abstract

The authors examine Australians moral responsibility regarding Aboriginal health care. Topics include popular opinion, moral debt, allocation of resources.

Published
1998

10. STATISTICAL CHARACTERIZATION OF THE CHANDRA SOURCE CATALOG

Author

Primini, Francis A., primary, Houck, John C., additional, Davis, John E., additional, Nowak, Michael A., additional, Evans, Ian N., additional, Glotfelty, Kenny J., additional, Anderson, Craig S., additional, Bonaventura, Nina R., additional, Chen, Judy C., additional, Doe, Stephen M., additional, Evans, Janet D., additional, Fabbiano, Giuseppina, additional, Galle, Elizabeth C., additional, Gibbs, Danny G., additional, Grier, John D., additional, Hain, Roger M., additional, Hall, Diane M., additional, Harbo, Peter N., additional, He, Xiangqun (Helen), additional, Karovska, Margarita, additional, Kashyap, Vinay L., additional, Lauer, Jennifer, additional, McCollough, Michael L., additional, McDowell, Jonathan C., additional, Miller, Joseph B., additional, Mitschang, Arik W., additional, Morgan, Douglas L., additional, Mossman, Amy E., additional, Nichols, Joy S., additional, Plummer, David A., additional, Refsdal, Brian L., additional, Rots, Arnold H., additional, Siemiginowska, Aneta, additional, Sundheim, Beth A., additional, Tibbetts, Michael S., additional, Van Stone, David W., additional, Winkelman, Sherry L., additional, and Zografou, Panagoula, additional

Published
2011
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11. THE CHANDRA SOURCE CATALOG

Author

Evans, Ian N., primary, Primini, Francis A., additional, Glotfelty, Kenny J., additional, Anderson, Craig S., additional, Bonaventura, Nina R., additional, Chen, Judy C., additional, Davis, John E., additional, Doe, Stephen M., additional, Evans, Janet D., additional, Fabbiano, Giuseppina, additional, Galle, Elizabeth C., additional, Gibbs, Danny G., additional, Grier, John D., additional, Hain, Roger M., additional, Hall, Diane M., additional, Harbo, Peter N., additional, He, Xiangqun (Helen), additional, Houck, John C., additional, Karovska, Margarita, additional, Kashyap, Vinay L., additional, Lauer, Jennifer, additional, McCollough, Michael L., additional, McDowell, Jonathan C., additional, Miller, Joseph B., additional, Mitschang, Arik W., additional, Morgan, Douglas L., additional, Mossman, Amy E., additional, Nichols, Joy S., additional, Nowak, Michael A., additional, Plummer, David A., additional, Refsdal, Brian L., additional, Rots, Arnold H., additional, Siemiginowska, Aneta, additional, Sundheim, Beth A., additional, Tibbetts, Michael S., additional, Van Stone, David W., additional, Winkelman, Sherry L., additional, and Zografou, Panagoula, additional

Published
2010
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12. THE CHANDRA VARIABLE GUIDE STAR CATALOG

Author

Nichols, Joy S., primary, Henden, Arne A., additional, Huenemoerder, David P., additional, Lauer, Jennifer L., additional, Martin, Eric, additional, Morgan, Douglas L., additional, and Sundheim, Beth A., additional

Published
2010
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14. The Chandra Source Catalog

Author

Evans, Ian, Primini, Francis A., Glotfelty, Kenny J., Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs, Danny G., Grier, John D., Hain, Roger, Hall, Diane M., Harbo, Peter N., He, Xiang Qun, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Jonathan McDowell, Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Rots, Arnold H., Siemiginowska, Aneta L., Sundheim, Beth A., Tibbetts, Michael S., Stone, David W., Winkelman, Sherry L., and Zografou, Panagoula

15. The Chandra Source Catalog: Storage and Interfaces

Author

Stone, David, Harbo, Peter N., Tibbetts, Michael S., Zografou, Panagoula, Evans, Ian N., Primini, Francis A., Glotfelty, Kenny J., Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs, Danny G., Grier, John D., Hain, Roger, Hall, Diane M., He, Xiang Qun, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Jonathan McDowell, Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Rots, Arnold H., Siemiginowska, Aneta L., Sundheim, Beth A., and Winkelman, Sherry L.

16. The Chandra Source Catalog: Source Properties and Data Products

Author

Rots, Arnold, Evans, Ian N., Glotfelty, Kenny J., Primini, Francis A., Zografou, Panagoula, Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs, Danny G., Grier, John D., Hain, Roger, Hall, Diane M., Harbo, Peter N., He, Xiang Qun, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Jonathan McDowell, Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Siemiginowska, Aneta L., Sundheim, Beth A., Tibbetts, Michael S., Stone, David W., and Winkelman, Sherry L.

17. Chandra Source Catalog: User Interface

Author

Bonaventura, Nina, Evans, Ian N., Rots, Arnold H., Tibbetts, Michael S., Stone, David W., Zografou, Panagoula, Primini, Francis A., Glotfelty, Kenny J., Anderson, Craig S., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs, Danny G., Grier, John D., Hain, Roger, Hall, Diane M., Harbo, Peter N., He, Helen, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Jonathan McDowell, Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Siemiginowska, Aneta L., Sundheim, Beth A., and Winkelman, Sherry L.

18. The Chandra Source Catalog: Background Determination and Source Detection

Author

Mccollough, Michael, Arnold Rots, Primini, Francis A., Evans, Ian N., Glotfelty, Kenny J., Hain, Roger, Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Danny G Gibbs, Ii, Grier, John D., Hall, Diane M., Harbo, Peter N., He, Xiang Qun, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Mcdowell, Jonathan C., Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Refsdal, Brian L., Siemiginowska, Aneta L., Sundheim, Beth A., Tibbetts, Michael S., Stone, David W., Winkelman, Sherry L., and Zografou, Panagoula

19. The Chandra Source Catalog: Spectral Properties

Author

Doe, Stephen, Siemiginowska, Aneta L., Refsdal, Brian L., Evans, Ian N., Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs, Danny G., Glotfelty, Kenny J., Grier, John D., Hain, Roger, Hall, Diane M., Harbo, Peter N., He, Xiang Qun, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, Mccollough, Michael L., Mcdowell, Jonathan C., Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Primini, Francis A., Arnold Rots, Sundheim, Beth A., Tibbetts, Michael S., Stone, David W., Winkelman, Sherry L., and Zografou, Panagoula

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