# 2013A&A...555A..70T

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 Query : 2013A&A...555A..70T

2013A&A...555A..70T - Astronomy and Astrophysics, volume 555A, 70-70 (2013/7-1)

An exploration of hadronic interactions in blazars using IceCube.

TCHERNIN C., AGUILAR J.A., NERONOV A. and MONTARULI T.

Abstract (from CDS):

Hadronic models, involving matter (proton or nuclei) acceleration in blazar jets, imply high energy photon and neutrino emissions due to interactions of high-energy protons with matter and/or radiation in the source environment. This paper shows that the sensitivity of the IceCube neutrino telescope in its 40-string configuration (IC-40) is already at the level of constraining the parameter space of purely hadronic scenarios of activity of blazars. Assuming that the entire source power originates from hadronic interactions, and assuming that the model describe the data, we estimate the expected neutrino flux from blazars based on the observed γ-ray flux by Fermi, simultaneously with IC-40 observations. We consider two cases separately to keep the number of constrainable parameters at an acceptable level: proton-proton or proton-gamma interactions are dominant. Comparing the IC-40 sensitivity to the neutrino flux expected from some of the brightest blazars, we constrain model parameters characterizing the parent high-energy proton spectrum. Using together the Fermi photon observations and the IC-40 neutrino sensitivities, we find that when pp interactions dominate, some constraints on the primary proton spectrum can be imposed. For instance, for the tightest constrained source 3C454.3, the very high energy part of the spectra of blazars is constrained to be harder than E–2 with cut-off energies in the range of Ecut≥1018eV. When interactions of high-energy protons on soft photon fields dominate, we can find similarly tight constraints on the proton spectrum parameters if the soft photon field is in the UV range or at higher energy, e.g. if it originates from the big blue bump'' produced by the accretion disk. The tightest constraint is for 3C273, with the cut-off energy constrained to be Ecut>1018eV for any spectral index and different soft photon fields, including the radiation from the accretions disk, broad line region or the synchrotron radiation from the jet. We have adopted a simplified approach using the IC-40 sensitivity (about one half of the full detector) to constrain parameters of blazar hadronic models. Data of the full detector are already available and corresponding constraints should be about a factor of 3 better than what discussed here.

Journal keyword(s): radiation mechanisms: non-thermal - neutrinos - galaxies: active

Full paper

 Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 850 1
2 QSO B0235+1624 BLL 02 38 38.9300958576 +16 36 59.276150136   16.46 15.50 15.92   ~ 1466 2
3 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2550 1
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5613 1
5 QSO B1502+1041 Bla 15 04 24.9800240304 +10 29 39.197268420   18.97 18.56 18.94   ~ 523 1
6 7C 1520+3154 Bla 15 22 09.9919479096 +31 44 14.382105036   20.45 19.89 19.87   ~ 165 1
7 QSO B1553+113 BLL 15 55 43.0440048528 +11 11 24.365649948 14.91 14.72 14.57 13.99   ~ 501 1
8 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2049 2
9 ICRF J200112.8+435252 BLL 20 01 12.8737326408 +43 52 52.840241616       15   ~ 63 1
10 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2717 2

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2022.11.28-13:37:40