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Title: Gamma-Ray Upper Limits on Magnetars with Six Years of FERMI-LAT Observations

In this article, we report on the search for gamma-ray emission from 20 magnetars using six years of Fermi Large Area Telescope observations. No significant evidence for gamma-ray emission from any of the currently known magnetars is found. We derived the most stringent upper limits to date on the 0.1–10 GeV emission of Galactic magnetars, which are estimated between ~10 -12 and 10 -11 erg s -1 cm -2. We searched gamma-ray pulsations for the four magnetars having reliable ephemerides over the observing period, but detected none. Finally, we also report updated morphologies and spectral properties of seven spatially extended gamma-ray sources, which are most likely attributed to supernova remnants associated with or adjacent to the magnetars.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [1]
  1. Institute of Space Sciences (IEEC-CSIC), Campus UAB, Barcelona (Spain)
  2. Institute of Space Sciences (IEEC-CSIC), Campus UAB, Barcelona (Spain); University of Amsterdam (The Netherlands). Anton Pannekoek Institute for Astronomy
  3. Institute of Space Sciences (IEEC-CSIC), Campus UAB, Barcelona (Spain); Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 835; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Fermi LAT Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; stars; magnetars; X-rays; gamma rays
OSTI Identifier:
1355743