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  • ASTRONOMY  (6)
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  • 1
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    Data analysis of the COMPTEL instrument on the NASA gamma ray observatory (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Compton imaging telescope (COMPTEL) on the Gamma Ray Observatory (GRO) is a wide field of view instrument. The coincidence measurement technique in two scintillation detector layers requires specific analysis methods. Straightforward event projection into the sky is impossible. Therefore, detector events are analyzed in a multi-dimensional dataspace using a gamma ray sky hypothesis convolved with the point spread function of the instrument in this dataspace. Background suppression and analysis techniques have important implications on the gamma ray source results for this background limited telescope. The COMPTEL collaboration applies a software system of analysis utilities, organized around a database management system. The use of this system for the assistance of guest investigators at the various collaboration sites and external sites is foreseen and allows different detail levels of cooperation with the COMPTEL institutes, dependent on the type of data to be studied.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop; p 95-101
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The search for MeV gamma-ray pulsars with COMPTEL (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Compton Gamma Ray Observatory (CGRO) completed a full sky survey in November 1993 during which the number of known gamma-ray pulsars more than doubled. During this survey the Compton Telescope (COMPTEL) observed the classical isolated pulsars Crab and Vela and detected PSR 1509-58. Attempts to detect the newly discovered pulsars, Geminga, PSR 1706-44 and PSR 1055-52, in the COMPTEL energy range provide only upper limits. The results of these analyses are presented together with the outcome of a search for further candidate radio pulsars whose ephemerides are given in the Princeton Pulsar Catalogue.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 15; 5; p. (5)61-(5)64
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Crab nebula and pulsar in the MeV energy range (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The imaging Compton Telescope (COMPTEL) is sensitive in the energy range of 0.75 to 30 MeV. COMPTEL observed the Crab several times during the Compton Gamma Ray Observatory (CGRO) sky survey and CGRO Phase II. Both the Crab pulsar and nebula are detected over the entire COMPTEL energy range. The phase-averaged energy spectra of the Crab Pulsar and Nebula are presented. The combined observations provide sufficient statistics for a phase-resolved analysis of the Crab pulsar spectrum.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 15; 5; p. (5)81-(5)84
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    COMPTEL observations of Ti-44 gamma-ray line emission from Cas A (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Compton Telescope (COMPTEL) telescope aboard the Compton Gamma-Ray Observatory (CGRO) is capable of imaging gamma-ray line sources in the MeV region with a sensitivity of the order 10(exp -5) photons/(sq cm s). During two observations periods in July 1992 and February 1993 the Galactic plane in the region of the young supernova remnant Cas A was observed, showing evidence for line emission at 1.16 MeV from the decay of Ti-44 at a significance level of approximately 4 sigma. This is the first time a supernova remnant has been detected in the gamma-ray line from Ti-44 decay. Adopting a distance of 2.8 kpc to the Cas A remnant, the measured line flux (7.0 +/- 1.7) x 10(exp -5) photons/(sq cm s), can be translated into a Ti-44 mass ejected during the Cas A supernova explosion, between (1.4 +/- 0.4) x 10(exp -4) solar mass and (3.2 +/- 0.8) x 10(exp -4) solar mass, depending on the precise value of the Ti-44 mean life time and on the precise date of the event. Implications of this result for supernova nucleosynthesis models are discussed.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 284; 1; p. L1-L4
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    NASA TECHNICAL REPORTS
  • 5
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    COMPTEL observations of the 1.809 MeV gamma-ray line from galactic Al-26 (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The COMPTEL experiment on the Compton Gamma-Ray Observatory (CGRO) has been demonstrated to be capable of imaging the Galaxy within its field of view of about 1 steradian in the 1.809 MeV gamma-ray line originating from radioactive Al-26. The combined data from the CGRO sky survey in 1991/1992 have been analyzed to provide a first map of the inner Galaxy in this gamma-ray line. The 1.809 MeV emission appears extended along the inner 70 deg of the Galactic plane, with a relatively sharp falloff outside this regime. Correlations with massive stars and supernova remnants as possible tracers of the candidate Al-26 sources are discussed.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal Supplement Series (ISSN 0067-0049); 92; 2; p. 429-432
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    NASA TECHNICAL REPORTS
  • 6
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    CGRO-Comptel observations of the Centaurus A region (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The sky region containing the active radio-galaxy Centaurus A has repeatedly been observed with the (COMPTEL) instrument onboard the Compton Gamma Ray Observatory (CGRO). The nine observation periods during the CGRO phases I and II in which Cen A was in the field of view of COMPTEL are spread over 18 months in the years 1991 to 1993. The energy range 0.75 to 30 MeV is covered. Clear evidence for a source with emission up to several MeV is seen from a region coinciding with the position of Cen A. The spectra change significantly over approximately 6 months between the two observation phases. A possible source confusion with the nearby gamma-ray source MS1312.1-4221 is discussed.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 15; 5; p. (5)37-(5)40
    Format: text
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