skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Cosmic rays in the surroundings of SNR G35.6–0.4

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [2];  [3];  [4];  [5]
  1. Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain); Institut de Ciencies de l'Espai (IEEC-CSIC), Barcelona (Spain)
  2. Nanjing Univ., Nanjing (China)
  3. Instituto de Astronomia y Fisica del Espacio (CONICET-UBA), Buenos Aires (Argentina)
  4. Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)
  5. Instituto de Fisica de Cantabria, Cantabria (Spain)
+ Show Author Affiliations

HESS J1858+020 is a TeV gamma-ray source that was reported to have no clearly catalogued counterpart at any wavelength. However, it has been recently proposed that this source is indirectly associated with the radio source, re-identified as a supernova remnant (SNR), G35.6–0.4. The latter has been found to be middle-aged (~30 kyr) and to have nearby molecular clouds (MCs). HESS J1858+020 was proposed to be the result of the interaction of protons accelerated in the SNR shell with target ions residing in the clouds. The Fermi Large Area Telescope (LAT) First Source Catalog does not list any source coincident with the position of HESS J1858+020, but some lie close. Here, we analyse more than 2 years of data obtained with the Fermi-LAT for the region of interest, and consider whether it is indeed possible that the closest LAT source, 1FGL J1857.1+0212c, is related to HESS J1858+020. We conclude it is not, and we impose upper limits on the GeV emission originating from HESS J1858+020. Using a simplified 3D model for the cosmic ray propagation out from the shell of the SNR, we consider whether the interaction between SNR G35.6–0.4 and the MCs nearby could give rise to the TeV emission of HESS J1858+020 without producing a GeV counterpart. If so, the pair of SNR/TeV source with no GeV detection would be reminiscent of other similarly aged SNRs, such as some of the TeV hotspots near W28, for which cosmic ray diffusion may be used to explain their multifrequency phenomenology. Furthermore, for HESS J1858+020, we found that although the phase space in principle allows such a GeV–TeV non-correlation to appear, usual and/or observationally constrained values of the parameters (e.g., diffusion coefficients and cloud–SNR likely distances) would disfavour it.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356799
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 417, Issue 4; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (21)

FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W51C journal October 2009
FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG journal May 2010
THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS journal March 2010
SEARCH FOR GAMMA-RAY EMISSION FROM MAGNETARS WITH THE FERMI LARGE AREA TELESCOPE journal November 2010
HESS very-high-energy gamma-ray sources without identified counterparts journal October 2007
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION journal May 2009
Particle acceleration at astrophysical shocks: A theory of cosmic ray origin journal October 1987
Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant journal December 2009
The GeV‐TeV Connection in Galactic γ‐Ray Sources journal June 2008
Gamma rays from molecular clouds journal April 2007
Re-identification of G35.6−0.4 as a supernova remnant journal October 2009
Upper limit of peak area journal July 1983
Energy spectra of gamma rays, electrons, and neutrinos produced at proton-proton interactions in the very high energy regime journal August 2006
γ-rays from molecular clouds illuminated by accumulated diffusive protons from supernova remnant W28: γ-ray spectra of SNR W28 journal September 2010
The Likelihood Analysis of EGRET Data journal April 1996
Identifying the counterpart of HESS J1858+020 journal January 2010
Study of the molecular clump associated with the high-energy source HESS J1858+020 journal May 2011
Diffusion of Cosmic Rays and the Gamma‐Ray Large Area Telescope : Phenomenology at the 1–100 GeV Regime journal December 2008
A search for VHE counterparts of Galactic Fermi bright sources and MeV to TeV spectral characterization journal July 2010
Supernova remnants and γ-ray sources journal August 2003
The GeV to TeV connection in the environment of SNR IC 443: The GeV to TeV connection in SNR IC 443 journal August 2010

Cited By (4)

Observational Signatures of Particle Acceleration in Supernova Remnants journal August 2012
Observational Signatures of Particle Acceleration in Supernova Remnants book January 2012
Observational signatures of particle acceleration in supernova remnants text January 2012
Analytic Solution for Self-regulated Collective Escape of Cosmic Rays from their Acceleration Sites text January 2012

Similar Records

A KINEMATIC DISTANCE STUDY OF THE PLANETARY NEBULAE-SUPERNOVA REMNANT-H II REGION COMPLEX AT G35.6–0.5
Journal Article · Tue Oct 01 00:00:00 EDT 2013 · Astrophysical Journal · OSTI ID:1356799
+1 more
Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)
Journal Article · Wed Jun 30 00:00:00 EDT 2010 · The Astrophysical Journal · OSTI ID:1356799
+151 more
FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)
Journal Article · Tue Jul 20 00:00:00 EDT 2010 · Astrophysical Journal · OSTI ID:1356799
+17 more

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ISM: supernova remnants