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  • Articles  (121)
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  • 11
    Electronic Resource
    Electronic Resource
    Galaktische Gamma-Astronomie (1982)
    Springer
    Naturwissenschaften 69 (1982), S. 212-219 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract During the last decade the exploration of the sky in the light of gamma rays has begun by means of satellite- and balloon-borne instruments. Like in other ranges of the electromagnetic spectrum the Milky Way clearly stands out against the rest of the sphere. Part of the galactic γ-ray emission is due to discrete sources, part is diffuse in origin and is produced in interstellar space. Some of the discrete γ-ray sources are radio pulsars, the nature of the other sources is still unknown. The intensity distribution of the diffuse galactic γ-ray component is consistent with a decrease of the cosmic-ray intensity towards the outer part of the galaxy. The identification of the cosmic-ray sources will be one of the main objectives of the next generation of γ-ray telescopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398636
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  • 12
    Electronic Resource
    Electronic Resource
    Wie aussichtsreich ist die Suche nach Gamma-Pulsaren? (1985)
    Springer
    Naturwissenschaften 72 (1985), S. 133-138 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490395
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  • 13
    Electronic Resource
    Electronic Resource
    Die diffuse kosmische Gamma-Strahlung (1974)
    Springer
    Naturwissenschaften 61 (1974), S. 250-256 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595656
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  • 14
    Electronic Resource
    Electronic Resource
    Mission aspects of GRASP ESA's prospective gamma-ray astronomy satellite (1989)
    Springer
    Space science reviews 49 (1989), S. 173-177 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mission aspects of the project GRASP (Gamma-Ray Astronomy with Spectroscopy and Positioning) are described as documented in the ESA assessment study at the end of 1986. The goals of this study addressed scientific objectives, technical solutions and feasibility of the mission. Two accommodation studies accompanied the assessment study. Their results show that GRASP can be accommodated on two existing space platforms, EURECA-B and ROBUS, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173752
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  • 15
    Electronic Resource
    Electronic Resource
    The GRASP telescope (1989)
    Springer
    Space science reviews 49 (1989), S. 157-171 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The GRASP mission Gamma-Ray Astronomy with Spectroscopy and Positioning addresses the scientific goals of fine spectroscopy with imaging and accurate positioning of gamma-ray sources, an unexplored area within gamma-ray astronomy. The assessment of GRASP as a future space astronomy mission in the mid-1990s has led to the design of the instrument outlined in this article. Thus GRASP is a third generation gamma-ray telescope and is designed to operate as a high quality spectral imager in the mid-1990s, when, following the GRO, SIGMA, and GAMMA-1 missions, there will be requirement for a more sophisticated instrument to maintain the momentum of advance in gamma-ray astronomy. The telescope will be capable of locating point sources with a precision of typically 1 arc min, whilst making a fine spectral analysis (E/ΔE ∼ 1000) of any gamma-ray line features. The high sensitivity of this instrument and the long (〉 2 year) lifetime of the mission will enable a large number (∼ 1000) of astronomical objects to be studied. The GRASP mission has the potential to move gamma-ray astronomy from an era of basic exploration to one in which detailed and novel measurements can be used to gain a better understanding of many astrophysical problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173751
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  • 16
    Electronic Resource
    Electronic Resource
    Comptel analysis of GRB 940217 (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 153-156 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract COMPTEL on board CGRO has observed a very strong (S[〉 0.3 MeV] = 2.03 × 10−4 erg cm−2), complex, and long lasting (162 s) gamma-ray burst on February 17, 1994 (GRB 940217). Temporal fluctuations occur on timescales as short as 100 ms. Hard-to-soft spectral evolution has been observed during the burst emission and also within individual peaks. The photon spectra obtained within the 6 peaks can be modelled by single power law spectra and by broken power laws with break energies at around 1 MeV. The best-fit power law slopes vary between 1.1 and 3.5 throughout the event. The burst is located at [α 2000,δ 2000] = [29.5°, 3.8°] with a 3σ error radius of 0.9°. COMPTEL does not detect any significant “post-burst” emission (as reported by EGRET) at low energies (〈 30 MeV), and our upper limits are marginally consistent with the EGRET detections. Using high energy spectral and temporal information, distance limits to GRB 940217 have been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658606
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  • 17
    Electronic Resource
    Electronic Resource
    Analysis of COMPTEL gamma-ray burst locations and spectra (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 231-234 
    Details
    ISSN: 1572-946X
    Keywords: gamma-ray bursts: observations ; locations ; spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In its first three years of operation, the COMPTEL instrument on theCompton Gamma-Ray Observatory has measured the locations (mean accuracy ∼1°) and spectra (0.75-30 MeV) of 18 gamma-ray bursts and continues to observe new events at a rate of ∼1/month. With good angular resolution and sensitivity at MeV energies, the growing COMPTEL burst catalog is an important new piece of evidence in the on-going GRB mystery. The COMPTEL burst locations are consistent with an isotropic distribution of sources, yet the spatial coincidence of two of the bursts indicates the possibility of repetition. The COMPTEL burst spectra are in most cases consistent with a single power law model with spectral index in the range 2–3. However, two bursts show evidence of a spectral break in the MeV range. Measurement of rapid variability at MeV energies in the stronger bursts provides evidence that either the sources are nearby (within the Galaxy) or the gamma-ray emission is relativistically beamed. We present an overview of analysis results obtained from the COMPTEL burst catalog concentrating on the search for burst repetition and the implications of highly variable MeV emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658622
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  • 18
    Electronic Resource
    Electronic Resource
    Origin of the diffuse galactic gamma-ray emission at low and medium gamma-ray energies (1983)
    Springer
    Space science reviews 36 (1983), S. 249-266 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently the galactic plane has been observed in the low and medium energy gamma-ray range in the directions towards the center and anticenter. Spectral measurements are now available at those energies, where the contribution from π°-decay gamma rays can be neglected. The high MeV-fluxes observed in both parts of the Galaxy are an indication of either a strong electron induced component or a high contribution from unresolved sources. Several interstellar cosmic-ray electron spectra have been used to calculate the contribution from electron bremsstrahlung and inverse Compton collisions with optical, infrared and 2.7 K black-body photons. From these calculations restrictions on the interstellar electron spectrum are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247090
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  • 19
    Electronic Resource
    Electronic Resource
    Influence of multiple compton scattering on the spectrum of soft diffuse gamma rays at balloon altitudes (1974)
    Springer
    Astrophysics and space science 30 (1974), S. L17 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Monte Carlo program has been developed in order to examine the influence of multiple Compton scattering in the atmosphere on the spectrum of cosmic diffuse gamma rays. It is shown that the corrections to the made to the measurements of the double-Compton gamma telescope at 2·5 gr cm−2 rest atmosphere by Schönfelder and Lichti (1974) are lower than 4% in the energy range between 1.5 and 10 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648295
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  • 20
    Electronic Resource
    Electronic Resource
    Gamma ray astronomy and search for antimatter in the universe (1989)
    Springer
    Hyperfine interactions 44 (1989), S. 85-96 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gamma ray astronomy provides a powerful tool for searching antimatter in the universe; it probably provides the only means to determine, if the universe has baryon symmetry. Presently existing gamma-ray observations can be interpreted without postulating the existence of antimatter. However, the measurements are not precise enough to definitely exclude the possibility of its existence. The search for antimatter belongs to one of the main scientific objectives of the Gamma Ray Observatory GRO of NASA, which will be launched in 1990 by the Space Shuttle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398660
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