C.D.S. - SIMBAD4 rel 1.7 - 2019.08.21CEST03:42:33

2014A&A...567A..23Y - Astronomy and Astrophysics, volume 567A, 23-23 (2014/7-1)

Fermi Large Area Telescope observations of the supernova remnant HESS J1731-347.


Abstract (from CDS):

HESS J1731-347 has been identified as one of the few TeV-bright shell-type supernova remnants (SNRs). These remnants are dominated by nonthermal emission, and the nature of TeV emission has been continuously debated for nearly a decade. We carry out the detailed modeling of the radio to γ-ray spectrum of HESS J1731-347 to constrain the magnetic field and energetic particles sources, which we compare with those of the other TeV-bright shell-type SNRs explored before. Four years of data from Fermi Large Area Telescope (LAT) observations for regions around this remnant are analyzed, leading to no detection correlated with the source discovered in the TeV band. The Markov chain Monte Carlo method is used to constrain parameters of one-zone models for the overall emission spectrum. Based on the 99.9% upper limits of fluxes in the GeV range, one-zone hadronic models with an energetic proton spectral slope greater than 1.8 can be ruled out, which favors a leptonic origin for the γ-ray emission, making this remnant a sibling of the brightest TeV SNR RX J1713.7-3946, the Vela Junior SNR RX J0852.0-4622, and RCW 86. The best-fit leptonic model has an electron spectral slope of 1.8 and a magnetic field of ∼30µG, which is at least a factor of 2 higher than those of RX J1713.7-3946 and RX J0852.0-4622, posing a challenge to the distance estimate and/or the energy equipartition between energetic electrons and the magnetic field of this source. A measurement of the shock speed will address this challenge and has implications on the magnetic field evolution and electron acceleration driven by shocks of SNRs.

Abstract Copyright:

Journal keyword(s): acceleration of particles - ISM: supernova remnants - gamma rays: general - cosmic rays - gamma rays: ISM

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
1 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 385 2
2 ESO 134-11 HII 14 40 29 -62 38.7           ~ 492 1
3 SNR G347.3-00.5 SNR 17 12 27 -39 41.2           ~ 576 1
4 HESS J1729-345 gam 17 29 00.0 -34 30 00           ~ 14 0
5 1FGL J1729.1-3452c gam 17 29 10 -34 52.7           ~ 6 0
6 SNR G353.6-00.7 SNR 17 31 55.0 -34 42 36           ~ 90 0
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10884 0

    Equat.    Gal    SGal    Ecl

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