+ 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. + NASA Center + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Halpern, Jules P. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 58 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order 1 2 3 4 5 6 Next  Diffuse emission and pathological Seyfert spectra Author(s): Halpern, Jules P. Abstract: In this annual ROSAT status report, the diffuse emission and spectra from Seyfert galaxies are examined. Three papers are presented and their contents include the soft x-ray properties and spectra of a binary millisecond ... NASA Center: NASA (non Center Specific) Publication Year: 1995 Added to NTRS: 2008-11-10 Accession Number: 96N13426; Document ID: 19960003417; Report Number: CAL-2387, NAS 1.26:199634, NASA-CR-199634, NIPS-95-05563 Long-Term Hard X-Ray Monitoring of X-Ray Bursters Author(s): Halpern, Jules P.; Kaaret, Philip Abstract: The scientific goal of this project was to monitor a selected sample of x-ray bursters using data from the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory to characterize the hard x-ray ... NASA Center: Goddard Space Flight Center Publication Year: 1999 Added to NTRS: 2008-06-02 Document ID: 19990047447; Report Number: CAL-3090 Hard X-Ray Emission from X-Ray Bursters Author(s): Halpern, Jules P.; Kaaret, Philip Abstract: The scientific goal of this project is to study the hard x-ray emission from x-ray bursters. One target of opportunity observation was made for this investigation during 1997. We obtained 38ks of data on the source ... NASA Center: Goddard Space Flight Center Publication Year: 1999 Added to NTRS: 2008-06-02 Document ID: 19990042107; Report Number: CAL-3093 Testing for X-ray Periodicities in Seyfert Galaxies Author(s): Halpern, Jules P. Abstract: The Deep Survey instrument on the Extreme Ultraviolet Explorer obtained long, continuous light-curves of 10 Seyfert galaxies with durations of 5-33 days each. We present a uniform reduction of these data, which account for a ... NASA Center: Goddard Space Flight Center Publication Year: 2002 Added to NTRS: 2008-06-02 Document ID: 20020058226; Report Number: CAL-3463 Monitoring X-Ray Emission from X-Ray Bursters Author(s): Halpern, Jules P.; Kaaret, Philip Abstract: The scientific goal of this project was to monitor a selected sample of x-ray bursters using data from the All-Sky Monitor (ASM) on the Rossi X-Ray Timing Explorer together with data from the Burst and Transient Source ... NASA Center: Goddard Space Flight Center Publication Year: 1999 Added to NTRS: 2008-06-02 Document ID: 19990047384; Report Number: CAL-3091 "X-Ray Transients in Star-Forming Regions" and "Hard X-Ray Emission from X-Ray Bursters" Author(s): Halpern, Jules P.; Kaaret, Philip Abstract: This grant funded work on the analysis of data obtained with the Burst and Transient Experiment (BATSE) on the Compton Gamma-Ray Observatory. The goal of the work was to search for hard x-ray transients in star forming ... NASA Center: Goddard Space Flight Center Publication Year: 1999 Added to NTRS: 2008-06-02 Document ID: 19990116845; Report Number: CAL-3158 Search for Pulsations from a Nearby Millisecond Pulsar and Wasilewski 49: Mirror for a Hidden Seyfert 1 Nucleus Author(s): Halpern, Jules P. Abstract: Five studies are reported in this final report. The recently discovered 5.3 ms pulsar J10125307 at a distance of 520 pc is in an area of the sky which is particularly deficient in absorbing gas. The column density along the ... NASA Center: Goddard Space Flight Center Publication Year: 1999 Added to NTRS: 2008-06-02 Document ID: 19990032412; Report Number: CAL-3080 Variable spectra of active galaxies Author(s): Halpern, Jules P. Abstract: The analysis of EXOSAT spectra of active galaxies are presented. The objects examined for X-ray spectral variability were MR 2251-178 and 3C 120. The results of these investigations are described, as well as additional ... NASA Center: NASA (non Center Specific) Publication Year: 1988 Added to NTRS: 2005-10-13 Accession Number: 88N21091; Document ID: 19880011707; Report Number: CAL-1683, NAS 1.26:182694, NASA-CR-182694 Imaging the Nearby Seyfert 2 Galaxy NGC 1068, and Spectrum and Variability of Geminga Author(s): Halpern, Jules P. Abstract: The results of the research for NASA Grant NAG5-1606 are summarized in the following publications: (1) A ROSAT high resolution image of NGC 1068; (2) Discovery of soft x-ray pulsations from the gamma-ray source Geminga; and ... NASA Center: NASA (non Center Specific) Publication Year: 1993 Added to NTRS: 2005-08-25 Accession Number: 93N17401; Document ID: 19930008212; Report Number: CAL-2044, NAS 1.26:191905, NASA-CR-191905 Monitoring MRK 509: The Origin of the Reprocessor and Broad Band X-ray Spectrum of Narrow Line Seyfert 1 AKN 564 Author(s): Halpern, Jules P.; Leighly, Karen M. Abstract: The ten monitoring observations of Mrk 509 were made successfully between October 20 and November 26 last year. These observations were simultaneously with RXTE observations. A preliminary analysis of the RXTE observations ... NASA Center: Goddard Space Flight Center Publication Year: 1998 Added to NTRS: 2005-08-25 Document ID: 19990005959; Report Number: CAL-2798, NAS 1.26:207611, NASA/CR-1998-207611 1 2 3 4 5 6 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