Evidence for Gamma-Ray Flares in 3C 279 and PKS 1622-297 at ~10 MeV
The EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) has observed at energies above 100 MeV strong gamma-ray flares with short-term time variability from the gamma-ray blazars 3C 279 and PKS 1622-297. During these flaring periods both blazars have been detected by the COMPTEL experim...
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| Main Authors | , , , , , , , , |
|---|---|
| Format | Journal Article |
| Language | English |
| Published |
11.11.1997
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| Subjects | |
| Online Access | Get full text |
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| Abstract | The EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) has
observed at energies above 100 MeV strong gamma-ray flares with short-term time
variability from the gamma-ray blazars 3C 279 and PKS 1622-297. During these
flaring periods both blazars have been detected by the COMPTEL experiment
aboard CGRO at photon energies of about 10 MeV, revealing simultaneous
gamma-ray activity down to these energies. For both cases the derived fluxes
exceed those measured in previous observations, and 3C 279 shows an indication
for time variability within the observational period. Both sources show
evidence for `hard' MeV spectra. In general the behaviour of both sources at
gamma-ray energies is found to be quite similar supporting the conclusion that
the underlying physical mechanism for both gamma-ray flares might be the same. |
|---|---|
| AbstractList | The EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) has
observed at energies above 100 MeV strong gamma-ray flares with short-term time
variability from the gamma-ray blazars 3C 279 and PKS 1622-297. During these
flaring periods both blazars have been detected by the COMPTEL experiment
aboard CGRO at photon energies of about 10 MeV, revealing simultaneous
gamma-ray activity down to these energies. For both cases the derived fluxes
exceed those measured in previous observations, and 3C 279 shows an indication
for time variability within the observational period. Both sources show
evidence for `hard' MeV spectra. In general the behaviour of both sources at
gamma-ray energies is found to be quite similar supporting the conclusion that
the underlying physical mechanism for both gamma-ray flares might be the same. |
| Author | Collmar, W Williams, O. R McConnell, M Blom, J. J Schoenfelder, V Bloemen, H Stacy, J. G Bennett, K Hermsen, W |
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| BackLink | https://doi.org/10.1063/1.54054$$DView published paper (Access to full text may be restricted) https://doi.org/10.48550/arXiv.astro-ph/9711111$$DView paper in arXiv |
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| Snippet | The EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) has
observed at energies above 100 MeV strong gamma-ray flares with short-term time... |
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| SubjectTerms | Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics |
| Title | Evidence for Gamma-Ray Flares in 3C 279 and PKS 1622-297 at ~10 MeV |
| URI | https://arxiv.org/abs/astro-ph/9711111 |
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