+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Szymkowiak, A. E. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 38 record(s) matching your query. Sorted by: Publication Year in Ascending order 1 2 3 4 Next  HEAO 1 observations of the X-ray pulsar 4U1626-67 Author(s): Pravdo, S. H.; White, N. E.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J.; Swank, J. H.; Szymkowiak, A. E.; Tuohy, I.; Garmire, G. Abstract: Results of an observation of the 7-s pulsar 4U1626-67 with the A2 experiments on HEAO 1 are reported. The phase-averaged X-ray spectra which change radically as a function of pulse phase. Included in this spectral change is ... NASA Center: Goddard Space Flight Center Publication Year: 1979 Added to NTRS: 2004-11-03 Accession Number: 79N20946; Document ID: 19790012775; Report Number: NASA-TM-79727 HEAO 1 observations of the X-ray pulsar 4U 1626-67 Author(s): Pravdo, S. H.; White, N. E.; Szymkowiak, A. E.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J.; Swank, J. H.; Tuohy, I.; Garmire, G. Abstract: Results are reported for an observation of the 7-s pulsar 4U 1626-67 with the A-2 experiment on HEAO 1. The phase-averaged X-ray spectrum between 0.7 and 60 keV is complex, as are the constituent spectra, which change ... NASA Center: Goddard Space Flight Center Publication Year: 1979 Added to NTRS: 2004-11-03 Accession Number: 79A46028; Document ID: 19790062015 Is the remnant of SN 1006 Crablike Author(s): Becker, R. H.; Szymkowiak, A. E.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J. Abstract: The solid-state spectrometer on the Einstein Observatory and the GSFC cosmic X-ray spectrometer on OSO 8 have observed the X-ray spectrum of SN 1006. The data can be well represented by a power-law model with alpha = 1.2, ... NASA Center: Goddard Space Flight Center Publication Year: 1980 Added to NTRS: 2004-11-03 Accession Number: 81A11424; Document ID: 19810027020 X-ray spectral constraints on the broad-line cloud geometry of NGC 4151 Author(s): Holt, S. S.; Mushotzky, R. F.; Boldt, E. A.; Serlemitsos, P. J.; Becker, R. H.; Szymkowiak, A. E.; White, N. E. Abstract: X-ray spectral data from NGC 4151 taken with the Einstein Solid-State Spectrometer (SSS) and the HEAO 1 A-2 experiment cannot be simply reconciled with absorption from a uniform column of cold gas. The SSS data can, however, ... NASA Center: Goddard Space Flight Center Publication Year: 1980 Added to NTRS: 2004-11-03 Accession Number: 81A14376; Document ID: 19810029972 X-ray spectral constraints on the broad-line cloud geometry of NGC 4151 Author(s): Holt, S. S.; Muchotzky, R. F.; Becker, R. H.; Boldt, E. A.; Serlemitsos, P. J.; Szymkowiak, A. E.; White, N. E. Abstract: X-ray spectral data from NGC 4151 taken with the Einstein Solid-State Spectrometer (SSS) and the HEAO-1 A-2 experiment cannot be simply reconciled with absorption from a uniform column of cold gas. The SSS data can, however, ... NASA Center: Goddard Space Flight Center Publication Year: 1980 Added to NTRS: 2004-11-03 Accession Number: 80N27915; Document ID: 19800019414; Report Number: NASA-TM-80726 Is the remnant of SN1006 crab-like Author(s): Becker, R. H.; Szymkowiak, A. E.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J. Abstract: The solid state spectrometer on the Einstein Observatory and the GSFC cosmic X-ray spectrometer on OSO-8 observed the X-ray spectrum of SN1006. The data can be well-represented by a power-law model with alpha = 1.2, similar ... NASA Center: Goddard Space Flight Center Publication Year: 1980 Added to NTRS: 2008-06-30 Accession Number: 80N26251; Document ID: 19800017752; Report Number: NASA-TM-80689 X-ray spectroscopy of supernova remnants Author(s): Szymkowiak, A. E. Abstract: The information which can be obtained from X-ray spectroscopy of supernova remnants is considerd. The fitting of X-ray detector counts to models of the incident spectrum is discussed, and the types of thermal emission models ... NASA Center: Goddard Space Flight Center Publication Year: 1980 Added to NTRS: 2004-11-03 Accession Number: 82A34382; Document ID: 19820050847 On syntheses of the X-ray background with power-law sources Author(s): Dezotti, G.; Boldt, E. A.; Cavaliere, A.; Danese, L.; Franceschini, A.; Marshall, F. E.; Swank, J. H.; Szymkowiak, A. E. Abstract: The conditions under which the combined emission from power law sources can mimic the X-ray background (XRB) spectrum in the 3-50 keV range are considered in view of HEAO 1 A-2 experiment measurements, and it is confirmed ... NASA Center: Goddard Space Flight Center Publication Year: 1981 Added to NTRS: 2004-11-03 Accession Number: 85N12840; Document ID: 19850004532; Report Number: NAS 1.15:82173, NASA-TM-82173 High resolution X-ray and radio images of the Crab-like supernova remnant G21.5-0.9 Author(s): Becker, R. H.; Szymkowiak, A. E. Abstract: The Crab-like supernova remnant G21.5-0.9 has been imaged at 6 cm wavelength with the VLA and between 0.1-4 keV with the Einstein Observatory. Both the X-ray and radio images show a centrally peaked distribution of extended ... NASA Center: Goddard Space Flight Center Publication Year: 1981 Added to NTRS: 2004-11-03 Accession Number: 81A46172; Document ID: 19810061768 X-ray spectral classification of supernova remnants in the Large Magellanic Cloud Author(s): Clark, D. H.; Tuohy, I. R.; Dopita, M. A.; Mathewson, D. S.; Long, K. S.; Szymkowiak, A. E.; Culhane, J. L. Abstract: The solid state spectrometer on the Einstein Observatory was used to measure the 0.6-4.5 keV X-ray spectra of six prominent supernova remnants in the Large Magellanic Cloud, namely, N132D, N63A, N49, 0525-66.0, N157B, and ... NASA Center: Goddard Space Flight Center Publication Year: 1982 Added to NTRS: 2004-11-03 Accession Number: 82A30885; Document ID: 19820047350 1 2 3 4 Next  + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007