Understanding TeV-band cosmic-ray anistropy
- We investigate the temporal and spectral correlations between flux and anisotropy fluctuations of TeV-band cosmic rays in light of recent data taken with IceCube. We find that for a conventional distribution of cosmic-ray sources, the dipole anisotropy is higher than observed, even if source discreteness is taken into account. Moreover, even for a shallow distribution of galactic cosmic-ray sources and a reacceleration model, fluctuations arising from source discreteness provide a probability only of the order of 10% that the cosmic-ray anisotropy limits of the recent IceCube analysis are met. This probability estimate is nearly independent of the exact choice of source rate, but generous for a large halo size. The location of the intensity maximum far from the Galactic Center is naturally reproduced.
| Author details: | Martin PohlORCiDGND, David Eichler |
|---|---|
| DOI: | https://doi.org/10.1088/0004-637X/766/1/4 |
| ISSN: | 0004-637X |
| Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
| Publisher: | IOP Publ. Ltd. |
| Place of publishing: | Bristol |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2013 |
| Publication year: | 2013 |
| Release date: | 2017/03/26 |
| Tag: | cosmic rays |
| Volume: | 766 |
| Issue: | 1 |
| Number of pages: | 9 |
| Funding institution: | Helmholtz Alliance for Astroparticle Physics, HAP; Initiative and Networking Fund of the Helmholtz Association; Israel-US Binational Science Foundation; Israeli Science Foundation; Joan and Robert Arnow Chair of Theoretical Astrophysics |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
