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  • Astrophysics  (2)
  • Man/System Technology and Life Support  (1)
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  • 1
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    The Infrared Properties of Sources Matched in the WISE All-Sky and Herschel Atlas Surveys (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: We describe the infrared properties of sources detected over approx. 36 deg2 of sky in the GAMA 15-hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field Infrared Survey (WISE). With 5(sigma) point-source depths of 34 and 0.048 mJy at 250 microns and 3.4 microns, respectively, we are able to identify 50.6% of the H-ATLAS sources in the WISE survey, corresponding to a surface density of approx. 630 deg-2. Approximately two-thirds of these sources have measured spectroscopic or optical/near-IR photometric redshifts of z 〈 1. For sources with spectroscopic redshifts at z 〈 0.3, we find a linear correlation between the infrared luminosity at 3.4 microns and that at 250 microns, with +/-50% scatter over approx. 1.5 orders of magnitude in luminosity, approx. 10(exp 9) - 10(exp 10.5) Stellar Luminosity. By contrast, the matched sources without previously measured redshifts (r 〉 or approx. 20.5) have 250-350 microns flux density ratios that suggest either high-redshift galaxies (z 〉 or approx. 1.5) or optically faint low-redshift galaxies with unusually low temperatures (T 〈 or approx. 20). Their small 3.4-250 microns flux ratios favor a high-redshift galaxy population, as only the most actively star-forming galaxies at low redshift (e.g., Arp 220) exhibit comparable flux density ratios. Furthermore, we find a relatively large AGN fraction (approx. 30%) in a 12 microns flux-limited subsample of H-ATLAS sources, also consistent with there being a significant population of high-redshift sources in the no-redshift sample.
    Keywords: Astrophysics
    Type: GSFC.JA.7403.2012
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Thermal Protection System Imagery Inspection Management System -TIIMS (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: TIIMS is used during the inspection phases of every mission to provide quick visual feedback, detailed inspection data, and determination to the mission management team. This system consists of a visual Web page interface, an SQL database, and a graphical image generator. These combine to allow a user to ascertain quickly the status of the inspection process, and current determination of any problem zones. The TIIMS system allows inspection engineers to enter their determinations into a database and to link pertinent images and video to those database entries. The database then assigns criteria to each zone and tile, and via query, sends the information to a graphical image generation program. Using the official TIPS database tile positions and sizes, the graphical image generation program creates images of the current status of the orbiter, coloring zones, and tiles based on a predefined key code. These images are then displayed on a Web page using customized JAVA scripts to display the appropriate zone of the orbiter based on the location of the user's cursor. The close-up graphic and database entry for that particular zone can then be seen by selecting the zone. This page contains links into the database to access the images used by the inspection engineer when they make the determination entered into the database. Status for the inspection zones changes as determinations are refined and shown by the appropriate color code.
    Keywords: Man/System Technology and Life Support
    Type: MSC-24484-1 , NASA Tech Briefs, September 2011; 48-49
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The Infrared Properties of Sources Matched in the Wise All-Sky and Herschel ATLAS Surveys (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: We describe the infrared properties of sources detected over approx 36 sq deg of sky in the GAMA 15-hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (HATLAS) and Wide-field Infrared Survey (WISE). With 5sigma point-source depths of 34 and 0.048 mJy at 250 micron and 3.4 micron, respectively, we are able to identify 50.6% of the H-ATLAS sources in the WISE survey, corresponding to a surface density of approx 630 deg(exp -2). Approximately two-thirds of these sources have measured spectroscopic or optical/near-IR photometric redshifts of z 〈 1. For sources with spectroscopic redshifts at z 〈 0.3, we find a linear correlation between the infrared luminosity at 3.4 micron and that at 250 micron, with +/- 50% scatter over approx 1.5 orders of magnitude in luminosity, approx 10(exp 9) - 10(exp 10.5) Solar Luminosity By contrast, the matched sources without previously measured redshifts (r approx 〉 20.5) have 250-350 micron flux density ratios that suggest either high-redshift galaxies (z approx 〉 1.5) or optically faint low-redshift galaxies with unusually low temperatures (T approx 〈 20). Their small 3.4-250 micron flux ratios favor a high-redshift galaxy population, as only the most actively star-forming galaxies at low redshift (e.g., Arp 220) exhibit comparable flux density ratios. Furthermore, we find a relatively large AGN fraction (approx 30%) in a 12 micron flux-limited subsample of H-ATLAS sources, also consistent with there being a significant population of high-redshift sources in the no-redshift sample
    Keywords: Astrophysics
    Type: GSFC.GA.5868.2012
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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