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

Title: Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries

Abstract

Here, colliding wind binaries (CWBs) are thought to give rise to a plethora of physical processes including acceleration and interaction of relativistic particles. Observation of synchrotron radiation in the radio band confirms there is a relativistic electron population in CWBs. Accordingly, CWBs have been suspected sources of high-energy γ-ray emission since the COS-B era. Theoretical models exist that characterize the underlying physical processes leading to particle acceleration and quantitatively predict the non-thermal energy emission observable at Earth. Furthermore, we strive to find evidence of γ-ray emission from a sample of seven CWB systems: WR 11, WR 70, WR 125, WR 137, WR 140, WR 146, and WR 147. Theoretical modelling identified these systems as the most favourable candidates for emitting γ-rays. We make a comparison with existing γ-ray flux predictions and investigate possible constraints. We used 24 months of data from the Large Area Telescope (LAT) on-board the Fermi Gamma Ray Space Telescope to perform a dedicated likelihood analysis of CWBs in the LAT energy range. As a result, we find no evidence of γ-ray emission from any of the studied CWB systems and determine corresponding flux upper limits. For some CWBs the interplay of orbital and stellar parameters rendersmore » the Fermi-LAT data not sensitive enough to constrain the parameter space of the emission models. In the cases of WR140 and WR147, the Fermi -LAT upper limits appear to rule out some model predictions entirely and constrain theoretical models over a significant parameter space. A comparison of our findings to the CWB η Car is made.« less

Authors:
 [1];  [2];  [2];  [1]
  1. Leopold-Franzens-Univ. Innsbruck, Innsbruck (Austria)
  2. Leopold-Franzens-Univ. Innsbruck, Innsbruck (Austria); Stanford Univ., StanfordCA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1356573
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 555; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma rays: stars; stars: massive; binaries: general

Citation Formats

Werner, Michael, Reimer, O., Reimer, A., and Egberts, K. Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries. United States: N. p., 2013. Web. doi:10.1051/0004-6361/201220502.
Werner, Michael, Reimer, O., Reimer, A., & Egberts, K. Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries. United States. doi:10.1051/0004-6361/201220502.
Werner, Michael, Reimer, O., Reimer, A., and Egberts, K. Tue . "Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries". United States. doi:10.1051/0004-6361/201220502. https://www.osti.gov/servlets/purl/1356573.
@article{osti_1356573,
title = {Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries},
author = {Werner, Michael and Reimer, O. and Reimer, A. and Egberts, K.},
abstractNote = {Here, colliding wind binaries (CWBs) are thought to give rise to a plethora of physical processes including acceleration and interaction of relativistic particles. Observation of synchrotron radiation in the radio band confirms there is a relativistic electron population in CWBs. Accordingly, CWBs have been suspected sources of high-energy γ-ray emission since the COS-B era. Theoretical models exist that characterize the underlying physical processes leading to particle acceleration and quantitatively predict the non-thermal energy emission observable at Earth. Furthermore, we strive to find evidence of γ-ray emission from a sample of seven CWB systems: WR 11, WR 70, WR 125, WR 137, WR 140, WR 146, and WR 147. Theoretical modelling identified these systems as the most favourable candidates for emitting γ-rays. We make a comparison with existing γ-ray flux predictions and investigate possible constraints. We used 24 months of data from the Large Area Telescope (LAT) on-board the Fermi Gamma Ray Space Telescope to perform a dedicated likelihood analysis of CWBs in the LAT energy range. As a result, we find no evidence of γ-ray emission from any of the studied CWB systems and determine corresponding flux upper limits. For some CWBs the interplay of orbital and stellar parameters renders the Fermi-LAT data not sensitive enough to constrain the parameter space of the emission models. In the cases of WR140 and WR147, the Fermi -LAT upper limits appear to rule out some model predictions entirely and constrain theoretical models over a significant parameter space. A comparison of our findings to the CWB η Car is made.},
doi = {10.1051/0004-6361/201220502},
journal = {Astronomy and Astrophysics},
number = ,
volume = 555,
place = {United States},
year = {2013},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

SEARCH FOR GAMMA-RAY EMISSION FROM MAGNETARS WITH THE FERMI LARGE AREA TELESCOPE
journal, November 2010


Radio, X-ray, and γ-ray emission models of the colliding-wind binary WR 140
journal, October 2006


THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009


Gamma-ray follow-up studies on η Carinae
journal, August 2012


FERMI -LAT OBSERVATIONS OF THE DIFFUSE γ-RAY EMISSION: IMPLICATIONS FOR COSMIC RAYS AND THE INTERSTELLAR MEDIUM
journal, April 2012


The cosmic-ray and gas content of the Cygnus region as measured in γ -rays by the Fermi Large Area Telescope
journal, February 2012


The VIIth catalogue of galactic Wolf–Rayet stars
journal, February 2001


Nonthermal High‐Energy Emission from Colliding Winds of Massive Stars
journal, June 2006

  • Reimer, A.; Pohl, M.; Reimer, O.
  • The Astrophysical Journal, Vol. 644, Issue 2
  • DOI: 10.1086/503598

3D modelling of the colliding winds in η Carinae - evidence for radiative inhibition
journal, April 2009


On the Nature of the Central Source in η Carinae
journal, June 2001

  • Hillier, D. John; Davidson, K.; Ishibashi, K.
  • The Astrophysical Journal, Vol. 553, Issue 2
  • DOI: 10.1086/320948

Radio emission models of colliding-wind binary systems
journal, October 2003


The modulation of the gamma-ray emission from the binary LS 5039
journal, November 2007


FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG
journal, March 2012

  • Nolan, P. L.; Abdo, A. A.; Ackermann, M.
  • The Astrophysical Journal Supplement Series, Vol. 199, Issue 2
  • DOI: 10.1088/0067-0049/199/2/31

The Likelihood Analysis of EGRET Data
journal, April 1996

  • Mattox, J. R.; Bertsch, D. L.; Chiang, J.
  • The Astrophysical Journal, Vol. 461
  • DOI: 10.1086/177068

Particle acceleration and nonthermal radio emission in binaries of early-type stars
journal, January 1993

  • Eichler, D.; Usov, V.
  • The Astrophysical Journal, Vol. 402
  • DOI: 10.1086/172130

Physical Properties of Wolf-Rayet Stars
journal, September 2007


FERMI LARGE AREA TELESCOPE OBSERVATION OF A GAMMA-RAY SOURCE AT THE POSITION OF ETA CARINAE
journal, October 2010


Detection of Gamma-Ray Emission from the Eta-Carinae Region
journal, June 2009


In hot pursuit of the hidden companion of η  Carinae: An X-ray determination of the wind parameters
journal, February 2002


THE FERMI LARGE AREA TELESCOPE ON ORBIT: EVENT CLASSIFICATION, INSTRUMENT RESPONSE FUNCTIONS, AND CALIBRATION
journal, October 2012

  • Ackermann, M.; Ajello, M.; Albert, A.
  • The Astrophysical Journal Supplement Series, Vol. 203, Issue 1
  • DOI: 10.1088/0067-0049/203/1/4

Unified approach to the classical statistical analysis of small signals
journal, April 1998