In which shell-type SNRs should we look for gamma-rays and neutrinos from p-p collisions?
| dc.creator | Katz, Boaz | |
| dc.creator | Waxman, Eli | |
| dc.date | 2007-06-24 | |
| dc.date | 2007-12-23 | |
| dc.date.accessioned | 2026-07-07T11:17:10Z | |
| dc.date.available | 2026-07-07T11:17:10Z | |
| dc.description | We present a simple analytic model for the various contributions to the non-thermal emission from shell type SNRs, and show that this model's results reproduce well the results of previous detailed calculations. We show that the \geq 1 TeV gamma ray emission from the shell type SNRs RX J1713.7-3946 and RX J0852.0-4622 is dominated by inverse-Compton scattering of CMB photons (and possibly infra-red ambient photons) by accelerated electrons. Pion decay (due to proton-proton collisions) is shown to account for only a small fraction, \lesssim10^-2, of the observed flux, as assuming a larger fractional contribution would imply nonthermal radio and X-ray synchrotron emission and thermal X-ray Bremsstrahlung emission that far exceed the observed radio and X-ray fluxes. Models where pion decay dominates the \geq 1 TeV flux avoid the implied excessive synchrotron emission (but not the implied excessive thermal X-ray Bremsstrahlung emission) by assuming an extremely low efficiency of electron acceleration, K_ep \lesssim 10^-4 (K_ep is the ratio of the number of accelerated electrons and the number of accelerated protons at a given energy). We argue that observations of SNRs in nearby galaxies imply a lower limit of K_ep \gtrsim 10^-3, and thus rule out K_ep values \lesssim 10^-4 (assuming that SNRs share a common typical value of K_ep). It is suggested that SNRs with strong thermal X-ray emission, rather than strong non-thermal X-ray emission, are more suitable candidates for searches of gamma rays and neutrinos resulting from proton-proton collisions. In particular, it is shown that the neutrino flux from the SNRs above is probably too low to be detected by current and planned neutrino observatories (Abridged). | |
| dc.description | 13 pages, 1 figure, accepted for publication in JCAP, minor revisions | |
| dc.identifier | https://arxiv.org/abs/0706.3485 | |
| dc.identifier | http://arxiv.org/abs/0706.3485 | |
| dc.identifier | JCAP0801:018,2008 | |
| dc.identifier | doi:10.1088/1475-7516/2008/01/018 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/192915 | |
| dc.subject | Astrophysics | |
| dc.title | In which shell-type SNRs should we look for gamma-rays and neutrinos from p-p collisions? | |
| dc.type | text |