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Evidence of X-Ray Synchrotron Emission from Electrons Accelerated to 40 T[CLC]e[/CLC]V in the Supernova Remnant Cassiopeia A
Open accessAbstract
We present the 2-60 keV spectrum of the supernova remnant Cassiopeia A measured using the Proportional Counter Array and the High Energy X-Ray Timing Experiment on the Rossi X-Ray Timing Explorer satellite. In addition to the previously reported strong emission-line features produced by thermal plasmas, the broadband spectrum has a high-energy "tail" that extends to energies at least as high as 120 keV. This tail may be described by a broken power law that has photon indices of Γ 1 = 1.8 + 0.5 −0.6 and Γ 2 = 3.04 + 0.15 −0.13 and a break energy of E b = 15.9 + 0.3 −0.4 keV. We argue that the high-energy component, which dominates the spectrum above about 10 keV, is produced by synchrotron radiation from electrons that have energies up to at least 40 TeV. This conclusion supports the hypothesis that Galactic cosmic rays are accelerated predominantly in supernova remnants.
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Cited by
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
Atwood, W. B., Abdo, A. A., Ackermann, M., Althouse, W., Anderson, B., Axelsson, M., Baldini, L., Ballet, J., Band, D. L., Barbiellini, G., et al. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/697/2/1071 · Cited by 4,198
Supernova Remnants in the Sedov Expansion Phase: Thermal X‐Ray Emission
Borkowski, K. J., Lyerly, W. J., & Reynolds, S. P. (2001) · The Astrophysical Journal · doi:10.1086/319011 · Cited by 444
Metadata
- Authors
- Allen, G. E., Keohane, J. W., Gotthelf, E. V., Petre, R., Jahoda, K., Rothschild, R. E., Lingenfelter, R. E., Heindl, W. A., Marsden, D., Gruber, D. E., Pelling, M. R., & Blanco, P. R.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1997-09-20
- Volume
- 487
- Issue
- 1
- Pages
- L97-L100
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2130344480
- Cited by
- 184
- References
- 0
- FWCI
- 8.62
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: Evidence of X-Ray Synchrotron Emission from Electrons Accelerated to 40 T[CLC]e[/CLC]V in the Supernova Remnant Cassiopeia A. https://app.cochat.ai/papers/10.1086/310878
- The paper
- Allen, G. E., Keohane, J. W., Gotthelf, E. V., Petre, R., Jahoda, K., Rothschild, R. E., Lingenfelter, R. E., Heindl, W. A., Marsden, D., Gruber, D. E., Pelling, M. R., & Blanco, P. R. (1997). Evidence of X-Ray Synchrotron Emission from Electrons Accelerated to 40 T[CLC]e[/CLC]V in the Supernova Remnant Cassiopeia A. The Astrophysical Journal. https://doi.org/10.1086/310878
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
