Observation of supernova remnant IC 443 with the Fermi Large Area Telescope

Abdo, A. A.

doi:10.1088/0004-637X/712/1/459

Title: Observation of supernova remnant IC 443 with the Fermi Large Area Telescope

Journal Article · 02 March 2010 · The Astrophysical Journal

DOI: https://doi.org/10.1088/0004-637X/712/1/459 · OSTI ID:1357575

Abdo, A. A. ^[1]

Naval Research Lab. (NRL), Washington, DC (United States); National Academy of Sciences, Washington, DC (United States); et al.

Here, we report observation of the supernova remnant (SNR) IC 443 (G189.1+3.0) with the Fermi Gamma-ray Space Telescope Large Area Telescope (LAT) in the energy band between 200 MeV and 50 GeV. IC 443 is a shell-type SNR with mixed morphology located off the outer Galactic plane where high-energy emission has been detected in the X-ray, GeV and TeV gamma-ray bands. Past observations suggest IC 443 has been interacting with surrounding interstellar matter. Proximity between dense shocked molecular clouds and GeV-TeV gamma-ray emission regions detected by EGRET, MAGIC, and VERITAS suggests an interpretation that cosmic-ray (CR) particles are accelerated by the SNR. We accurately characterize the gamma-ray emission produced by the CRs accelerated at IC 443 using the high gamma-ray statistics and broad energy coverage provided by the LAT. The emission region is extended in the energy band with θ₆₈ = 0$$°\atop{.}$$27 ± 0fdg01(stat) ± 0$$°\atop{.}$$03(sys) for an assumed two-dimensional Gaussian profile and overlaps almost completely with the extended source region of VERITAS. Its centroid is displaced significantly from the known pulsar wind nebula (PWN) which suggests the PWN is not the major contributor in the present energy band. The observed spectrum changes its power-law slope continuously and continues smoothly to the MAGIC and VERITAS data points. Furthermore, the combined gamma-ray spectrum (200 MeV < 2 TeV) is reproduced well by decays of neutral pions produced by a broken power-law proton spectrum with a break around 70 GeV.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357575

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 712; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Supernova Shocks in Molecular Clouds: Velocity Distribution of Molecular Hydrogen Reach, William T.; Tram, Le Ngoc; Richter, Matthew The Astrophysical Journal, Vol. 884, Issue 1 https://doi.org/10.3847/1538-4357/ab41f7	journal	October 2019
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