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Title: Detailed investigation of the gamma-ray emission in the vicinity of SNR W28 with Fermi-LAT

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [9];  [10];  [11]
  1. Univ. of Tokyo (Japan). Inst. for Cosmic Ray Research
  2. Ibaraki Univ. (Japan). College of Science
  3. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). Center for Space Sciences and Technology (CRESST); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  4. Univ. of Paris Diderot, Saclay (France). Inst. of Research into the Fundamental Laws of the Universe (CEA-IRFU)
  5. Hiroshima Univ. (Japan). Dept. of Physical Sciences
  6. Nagoya Univ. (Japan). Dept. of Physics and Astrophysics
  7. Univ. of Bordeaux (France). Gradignan Bordeaux Center for Nuclear Research
  8. Inst. of Science in Spain (IEEE-CSIC), Barcelona (Spain)
  9. Max Planck Inst. for Extraterrestrial Physics, Garching (Germany)
  10. Inst. of Science in Spain (IEEE-CSIC), Barcelona (Spain); Catalan Institution for Research and Advanced Studies (ICREA), Barcelona (Spain)
  11. Aoyama Gakuin Univ., Kanagawa (Japan). Dept. of Physics and Mathematics
+ Show Author Affiliations

Here, we present a detailed investigation of the γ-ray emission in the vicinity of the supernova remnant (SNR) W28 (G6.4–0.1) observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. We detected significant γ-ray emission spatially coincident with TeV sources HESS J1800–240A, B, and C, located outside the radio boundary of the SNR. Their spectra in the 2-100 GeV band are consistent with the extrapolation of the power-law spectra of the TeV sources. We also identified a new source of GeV emission, dubbed Source W, which lies outside the boundary of TeV sources and coincides with radio emission from the western part of W28. All of the GeV γ-ray sources overlap with molecular clouds in the velocity range from 0 to 20 km s–1. Under the assumption that the γ-ray emission toward HESS J1800–240A, B, and C comes from π0 decay due to the interaction between the molecular clouds and cosmic rays (CRs) escaping from W28, they can be naturally explained by a single model in which the CR diffusion coefficient is smaller than the theoretical expectation in the interstellar space. Furthermore, we constrain the total energy of the CRs escaping from W28 through the same modeling to be larger than ~2 × 1049 erg. The emission from Source W can also be explained with the same CR escape scenario.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356528
Journal Information:
The Astrophysical Journal, Vol. 786, Issue 2; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

References (50)

The on-orbit calibration of the Fermi Large Area Telescope journal October 2009
FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W51C journal October 2009
Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT journal January 2010
OBSERVATION OF SUPERNOVA REMNANT IC 443 WITH THE FERMI LARGE AREA TELESCOPE journal March 2010
FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4–0.1) journal June 2010
Detection of the Characteristic Pion-Decay Signature in Supernova Remnants journal February 2013
The Extraordinary Outflow toward G5.89−0.39 journal February 1997
Discovery of very high energy gamma-ray emission coincident with molecular clouds in the W 28 (G6.4-0.1) field journal January 2008
FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT G8.7–0.1 journal December 2011
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION journal May 2009
Radio to Gamma‐Ray Emission from Shell‐Type Supernova Remnants: Predictions from Nonlinear Shock Acceleration Models journal March 1999
Discovery of 35 New Supernova Remnants in the Inner Galaxy journal February 2006
A New Σ‐ D Relation and Its Application to the Galactic Supernova Remnant Distribution journal September 1998
Polarization Observations of 1720 MHz OH Masers toward the Three Supernova Remnants W28, W44, and IC 443 journal November 1997
The Sizes of 1720 MHz OH Masers: VLBA and MERLIN Observations of the Supernova Remnants W44 and W28 journal September 1999
Positrons from dark matter annihilation in the galactic halo: Theoretical uncertainties journal March 2008
High-Resolution VLA Imaging of the Supernova Remnant W28 at 328 and 1415 MH[CLC]z[/CLC] journal October 2000
Shock-excited maser emission from the supernova remnant W28 journal April 1994
Alfvén wave amplification and self-containment of cosmic rays escaping from a supernova remnant: Alfvén wave amplification journal June 2011
Gamma rays from molecular clouds journal April 2007
Broad-band non-thermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants journal July 2009
Neutral pion Emission from Accelerated Protons in the Supernova Remnant w44 journal November 2011
AGILE detection of GeV $\sf$ γ -ray emission from the SNR W28 journal June 2010
Correlation of Supernova Remnant Masers and Gamma-Ray Sources journal November 2009
A young, glitching pulsar near the direction of W28 journal May 1993
The Possibly Remnant Massive Outflow in G5.89‐0.39. I. Observations and Initial Magnetohydrodynamic Simulations journal September 2006
All‐Sky 4.85 GHz Flux Measurements of H ii Regions journal October 1997
SEARCH FOR SPATIALLY EXTENDED FERMI LARGE AREA TELESCOPE SOURCES USING TWO YEARS OF DATA journal August 2012
γ-rays from molecular clouds illuminated by accumulated diffusive protons from supernova remnant W28: γ-ray spectra of SNR W28 journal September 2010
A survey of radio H II regions in the northern sky journal September 1989
The Parkes Multibeam Pulsar Survey - VI. Discovery and timing of 142 pulsars and a Galactic population analysis journal October 2006
The Likelihood Analysis of EGRET Data journal April 1996
A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources: 7 mm line survey: W28 field TeV sources journal November 2011
FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG journal March 2012
Escape-limited model of cosmic-ray acceleration revisited journal April 2010
Gamma-rays from molecular clouds illuminated by cosmic rays escaping from interacting supernova remnants: Gamma-rays from molecular clouds journal October 2010
On the high-energy gamma-ray signature of cosmic-ray sources journal November 1988
Limits on diffusive shock acceleration in supernova remnants in the presence of cosmic-ray streaming instability and wave dissipation journal April 2003
On the spectrum of high-energy cosmic rays produced by supernova remnants in the presence of strong cosmic-ray streaming instability and wave dissipation journal January 2005
Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic‐Ray Transport journal May 2006
Shocked Molecular Gas in the Supernova Remnants W28 and W44: Near‐Infrared and Millimeter‐Wave Observations journal January 2005
Supernova Remnants at High Energy journal September 2008
ROSAT / ASCA Observations of the Mixed‐Morphology Supernova Remnant W28 journal August 2002
Mapping the Outflow from G5.89-0.39 in SiO J = 5 → 4 journal October 2004
NANTEN Survey of Molecular Clouds toward the Galactic Center; Association of Compact Astronomical Objects journal June 2010
The AGILE space mission
  • Tavani, M.; Barbiellini, G.; Argan, A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 588, Issue 1-2 https://doi.org/10.1016/j.nima.2008.01.023
journal April 2008
The GeV to TeV connection in the environment of SNR IC 443: The GeV to TeV connection in SNR IC 443 journal August 2010
Gamma-Ray Emission from Crushed Clouds in Supernova Remnants journal October 2010
FERMI LARGE AREA TELESCOPE DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE VICINITY OF SNR W44 journal April 2012
Investigation of the Large-scale Neutral Hydrogen near the Supernova Remnant W28 journal October 2002

Cited By (13)

Second AGILE catalogue of gamma-ray sources journal June 2019
REFINING THE ASSOCIATIONS OF THE FERMI LARGE AREA TELESCOPE SOURCE CATALOGS journal February 2015
Towards observing reverberating and superefficient pulsar wind nebulae journal March 2019
AMS-02 beryllium data and its implication for cosmic ray transport journal January 2020
The Self-Control of Cosmic Rays journal June 2019
3FHL: The Third Catalog of Hard Fermi -LAT Sources journal September 2017
Fermi Large Area Telescope Fourth Source Catalog journal March 2020
Fermi Large Area Telescope Fourth Source Catalog text January 2020
3FHL: The Third Catalog of Hard Fermi -LAT Sources text January 2017
Fermi Large Area Telescope Fourth Source Catalog collection January 2020
Refining the associations of the Fermi Large Area Telescope Source Catalogs text January 2015
3FHL: The Third Catalog of Hard Fermi-LAT Sources text January 2017
Towards observing reverberating and superefficient pulsar wind nebulae text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
acceleration of particles
cosmic rays
diffusion
gamma rays: ISM
ISM: supernova remnants