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13 results on '"Evans, Janet"'

1. The Virtual Observatory&Reproducibility and Open Science in Astronomy

Author

Fabbiano, Giuseppina and Evans, Janet

Abstract

The International Virtual Observatory Alliance (IVOA) was founded 20 years ago with the purpose of fostering multi-wavelength / multi-archive data access and interoperability. The IVOA is a standards organization that has embraced what is now known as the FAIR data principle and has focused on data management and access, data-literature-tool interoperability and ‘big data’ access and analysis. Interfaces based on IVOA standards are found in the major astronomy data centers. Data reproducibility and ‘open science’ are the natural next step in this process that can be supported by reviewing and extending the IVOA standards.

Published
2022
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2. The Virtual Observatory&Reproducibility and Open Science in Astronomy

Author

Fabbiano, Giuseppina and Evans, Janet

Abstract

The International Virtual Observatory Alliance (IVOA) was founded 20 years ago with the purpose of fostering multi-wavelength / multi-archive data access and interoperability. The IVOA is a standards organization that has embraced what is now known as the FAIR data principle and has focused on data management and access, data-literature-tool interoperability and ‘big data’ access and analysis. Interfaces based on IVOA standards are found in the major astronomy data centers. Data reproducibility and ‘open science’ are the natural next step in this process that can be supported by reviewing and extending the IVOA standards.

Published
2022
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3. CubeX: A Compact X-ray Telescope Enables Both X-ray Fluorescence Imaging Spectroscopy and Pulsar Timing Based Navigation

Author

Stupl, Jan, Ebert, Monica, Mauro, David, Hong, Jaesub, Romaine, Suzanne, Kenter, Almus, Evans, Janet, and Kraft, Ralph

Abstract

This paper describes the miniaturized X-ray telescope payload, CubeX, in the context of a lunar mission. The first part describes the payload in detail, the second part summarizes a small satellite mission concept that utilizes its compact form factor and performance. This instrument can be used for both X-ray fluorescence (XRF) imaging spectroscopy and X-ray pulsar timing-based navigation (XNAV). It combines high angular resolution (< 1 >arcminutes) Miniature Wolter-I X-ray optics (MiXO) with a common focal plane consisting of high spectral resolution (keV) CMOS X-ray sensors and a high timing resolution (< 1 μsec) SDD X-ray sensor. This novel combination of the instruments enables both XRF measurements and XNAV operations without moving parts, in a small form factor (~1×1×6U

Published
2018

4. Stratosphere-Troposhere Exchange via cross-tropopause mixing in the extratropics

Author

Diaz, Karen, Weinheimer, Andrew, Rew, Juliana, Evans, Janet, and Burt, Melissa

Subjects
Oxidation reactions, Chemical composition, Aircraft measurements
Abstract

Stratosphere-Troposphere Exchange (STE) is the bi-directional exchange or transfer of mass and chemical species between the stratosphere and troposphere. STE helps determine the chemical composition of the stratosphere and troposphere, and thus affects climate, stratospheric ozone, and oxidation reactions in the troposphere. However, the ways it occurs are poorly understood. STE is expected across the tropopause, located between the troposphere and stratosphere. Data from three observational projects were studied for evidence of mixing: SUCCESS, TRACE-P, and CRYSTAL-FACE. Aircraft measurements were used to make correlation graphs of ozone versus carbon monoxide concentrations. Mixing, evident in high carbon monoxide (CO) concentrations in the lower stratosphere, was found for all projects. TRACE-P measurements showed relatively lower CO concentrations in the lower stratosphere, in spite of the high CO concentrations seen in the upper troposphere due to pollution episodes. CRYSTAL-FACE showed the highest CO concentration deep into the stratosphere on July 7 and 9, 2002. During these days, plumes from surface fires reached high into the stratosphere. High CO concentrations were recorded on July 3 for CRYSTAL-FACE and May 2 for SUCCESS, although they were not as deep into the stratosphere. Back trajectories possibly show fire plumes that reached the lower stratosphere on July 3. Back trajectories could possibly show a Warm Conveyor Belt on the Eastern Central Pacific that could have lifted polluted air from Asia to the vicinity of the tropopause on May 2.

Published
2005
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5. 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, 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
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, biology, Hubble Deep Field, Point source, media_common.quotation_subject, FOS: Physical sciences, Astronomy and Astrophysics, Extragalactic astronomy, computer.software_genre, biology.organism_classification, Acis, Space and Planetary Science, Sky, Data mining, Astrophysics - High Energy Astrophysical Phenomena, computer, media_common
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., 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

6. 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

7. Flexibility and Extensibility of Sherpa in CIAO 4.2

Author

Doe, Stephen, Nguyen, Dan T., Refsdal, Brian L., Siemiginowska, Aneta L., Aldcroft, Tom, Bonaventura, Nina R., Burke, Douglas, Evans, Ian N., Evans, Janet D., Fruscione, Antonella, Galle, Elizabeth C., Houck, John C., Lee, Nicholas, Jonathan McDowell, and Nowak, Michael A.

8. 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.

9. 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.

10. 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.

11. 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

12. 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

13. Sherpa: 1D/2D modeling and fitting in Python

Author

Refsdal, Brian L., Doe, Stephen M., Nguyen, Dan T., Siemiginowska, Aneta L., Bonaventura, Nina R., Burke, Douglas, Evans, Ian N., Evans, Janet D., Fruscione, Antonella, Galle, Elizabeth C., John Houck, Karovska, Margarita, Lee, Nicholas P., and Nowak, Michael A.

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