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Ninth International Fermi Symposium

12–17 Apr 2021
Africa/Johannesburg timezone

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Session

Exploring the Galaxy: Supernova Remnants & Pulsar Wind Nebulae

14 Apr 2021, 18:15

Conveners

Exploring the Galaxy: Supernova Remnants & Pulsar Wind Nebulae: Parallel-8

  • Jean Ballet (CEA Saclay)

Presentation materials

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  1. 67. Search for new cosmic-ray acceleration sites within the 4FGL catalog sources
    Marianne Lemoine-Goumard (CNRS)
    14/04/2021, 18:15
    SNR/PWN
    Contributed

    Cosmic rays are mostly composed by protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions which in turn decay into gamma rays. This offers a compelling way to identify the acceleration sites of protons. A characteristic hadronic spectrum was detected in the gamma-ray spectra of four Supernovae Remnants (SNRs), IC 443, W44,...

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  2. 68. Shell like Supernova Remnants observed with Fermi-LAT
    Francesco de Palma (INFN)
    14/04/2021, 18:30
    SNR/PWN
    Contributed

    Supernova Remnants (SNRs) emitting gamma rays in the GeV-TeV energy range are fundamental for identifying the accelerators of Galactic cosmic rays. In 2018 H.E.S.S. has revealed at TeV energies three extended shell-like sources: HESS J1534-571, HESS J1614-518 and HESS J1912+101. A radio Supernova Remnant (SNR) candidate has been identified as a counterpart to HESS J1534-571, therefore it is...

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  3. 69. G150.3+4.5: a new dynamically young SNR seen with the Fermi-LAT
    Justine Devin
    14/04/2021, 18:45
    SNR/PWN
    Contributed

    The supernova remnant (SNR) G150.3+4.5 was recently detected in radio and exhibits a shell-like morphology with an angular size of 3°, suggesting either an old or a nearby SNR. An extended Fermi-LAT source, spatially coincident with the radio SNR, was reported in the Fermi Galactic Extended Source Catalog. Using more than 10 years of Fermi-LAT data, we perform detailed morphological and...

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  4. 70. SNR G39.2-0.3, an hadronic cosmic rays accelerator
    Emma de Ona Wilhelmi
    14/04/2021, 19:00
    SNR/PWN
    Contributed

    Recent results obtained with gamma-ray satellites have established supernova remnants as accelerators of GeV hadronic cosmic rays. In such processes, CRs accelerated in SNR shocks interact with particles from gas clouds in their surrounding. In particular, the rich medium in which core-collapse SNRs explode provides a large target density to boost hadronic gamma-rays. SNR G39.2-0.3 is one of...

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  5. 71. Cosmic-ray acceleration and escape from post-adiabatic Supernova remnants
    Robert Brose
    14/04/2021, 19:15
    SNR/PWN
    Contributed

    Supernova remnants are known to accelerate cosmic rays on account of their non-thermal emission of radio waves, X-rays, and gamma rays. Although there are many models for the acceleration of cosmic rays in Supernova remnants, the escape of cosmic rays from these sources is yet understudied.
    We use our time-dependent acceleration code RATPaC to study the acceleration of cosmic rays and their...

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  6. 72. Pulsar wind nebulae as probes of high energy astrophysics
    Samayra Straal
    14/04/2021, 19:30
    SNR/PWN
    Contributed

    Pulsar wind nebulae (PWNe) are created by the interaction between the highly relativistic winds from pulsars and their surroundings. When young, the PWN resides in the remnant produced by the supernova explosion, and confines the entire energy input of the pulsar. These PWNe also prove to be excellent particle accelerators. Hence, the properties of these systems can be used to study the...

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