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

Title: Fermi Large Area Telescope Observation Of A Gamma-Ray Source At The Position Of Eta Carinae

Abstract

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected a γ-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The γ-ray signal is detected significantly throughout the LAT energy band (i.e., up to ~100 GeV). The 0.1-100 GeV energy spectrum is well represented by a combination of a cutoff power-law model (<10 GeV) and a hard power-law component (>10 GeV). The total flux (>100 MeV) is 3.7+0.3 –0.1 × 10–7 photons s–1 cm–2, with additional systematic uncertainties of 10%, and consistent with the average flux measured by AGILE. The light curve obtained by Fermi is consistent with steady emission. Our observations do not confirm the presence of a γ-ray flare in 2008 October, as reported by Tavani et al., although we cannot exclude that a flare lasting only a few hours escaped detection by the Fermi LAT. We also do not find any evidence for γ-ray variability that correlates with the large X-ray variability of Eta Carinae observed during 2008 December and 2009 January. We are thus notmore » able to establish an unambiguous identification of the LAT source with Eta Carinae.« less

Authors:
 [1]
  1. Naval Research Lab. (NRL), Washington, DC (United States); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357519
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 723; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Abdo, A. A,. Fermi Large Area Telescope Observation Of A Gamma-Ray Source At The Position Of Eta Carinae. United States: N. p., 2010. Web. doi:10.1088/0004-637X/723/1/649.
Abdo, A. A,. Fermi Large Area Telescope Observation Of A Gamma-Ray Source At The Position Of Eta Carinae. United States. doi:10.1088/0004-637X/723/1/649.
Abdo, A. A,. Wed . "Fermi Large Area Telescope Observation Of A Gamma-Ray Source At The Position Of Eta Carinae". United States. doi:10.1088/0004-637X/723/1/649. https://www.osti.gov/servlets/purl/1357519.
@article{osti_1357519,
title = {Fermi Large Area Telescope Observation Of A Gamma-Ray Source At The Position Of Eta Carinae},
author = {Abdo, A. A,},
abstractNote = {The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected a γ-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The γ-ray signal is detected significantly throughout the LAT energy band (i.e., up to ~100 GeV). The 0.1-100 GeV energy spectrum is well represented by a combination of a cutoff power-law model (<10 GeV) and a hard power-law component (>10 GeV). The total flux (>100 MeV) is 3.7+0.3 –0.1 × 10–7 photons s–1 cm–2, with additional systematic uncertainties of 10%, and consistent with the average flux measured by AGILE. The light curve obtained by Fermi is consistent with steady emission. Our observations do not confirm the presence of a γ-ray flare in 2008 October, as reported by Tavani et al., although we cannot exclude that a flare lasting only a few hours escaped detection by the Fermi LAT. We also do not find any evidence for γ-ray variability that correlates with the large X-ray variability of Eta Carinae observed during 2008 December and 2009 January. We are thus not able to establish an unambiguous identification of the LAT source with Eta Carinae.},
doi = {10.1088/0004-637X/723/1/649},
journal = {Astrophysical Journal},
number = 1,
volume = 723,
place = {United States},
year = {2010},
month = {10}
}

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

Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

FERMI /LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LIST
journal, June 2009

  • Abdo, A. A.; Ackermann, M.; Ajello, M.
  • The Astrophysical Journal Supplement Series, Vol. 183, Issue 1
  • DOI: 10.1088/0067-0049/183/1/46

FERMI LARGE AREA TELESCOPE DETECTION OF PULSED γ-RAYS FROM THE VELA-LIKE PULSARS PSR J1048–5832 AND PSR J2229+6114
journal, November 2009


BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY
journal, July 2009


Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
journal, July 2009


DISCOVERY OF PULSED γ-RAYS FROM THE YOUNG RADIO PULSAR PSR J1028–5819 WITH THE FERMI LARGE AREA TELESCOPE
journal, March 2009


FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE CRAB PULSAR AND NEBULA
journal, December 2009


FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG
journal, May 2010

  • Abdo, A. A.; Ackermann, M.; Ajello, M.
  • The Astrophysical Journal Supplement Series, Vol. 188, Issue 2
  • DOI: 10.1088/0067-0049/188/2/405

The unidentified TeV source (TeV J2032+4130) and surrounding field: Final HEGRA IACT-System results
journal, February 2005


A Time-differencing Technique for Detecting Radio-quiet Gamma-Ray Pulsars
journal, November 2006

  • Atwood, W. B.; Ziegler, M.; Johnson, R. P.
  • The Astrophysical Journal, Vol. 652, Issue 1
  • DOI: 10.1086/510018

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


The Swift X-Ray Telescope
journal, October 2005


RADIO DETECTION OF LAT PSRs J1741-2054 AND J2032+4127: NO LONGER JUST GAMMA-RAY PULSARS
journal, October 2009


The periodicity of the η Carinae events
journal, March 2008


Eta Carinae and its Environment
journal, September 1997


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

X‐Ray Spectral Variation of η Carinae through the 2003 X‐Ray Minimum
journal, July 2007

  • Hamaguchi, Kenji; Corcoran, Michael F.; Gull, Theodore
  • The Astrophysical Journal, Vol. 663, Issue 1
  • DOI: 10.1086/518101

A Smoking gun in the Carina Nebula
journal, March 2009

  • Hamaguchi, Kenji; Corcoran, Michael F.; Ezoe, Yuichiro
  • The Astrophysical Journal, Vol. 695, Issue 1
  • DOI: 10.1088/0004-637X/695/1/L4

The Third EGRET Catalog of High‐Energy Gamma‐Ray Sources
journal, July 1999

  • Hartman, R. C.; Bertsch, D. L.; Bloom, S. D.
  • The Astrophysical Journal Supplement Series, Vol. 123, Issue 1
  • DOI: 10.1086/313231

Calibration of the Rossi X‐Ray Timing Explorer Proportional Counter Array
journal, April 2006

  • Jahoda, Keith; Markwardt, Craig B.; Radeva, Yana
  • The Astrophysical Journal Supplement Series, Vol. 163, Issue 2
  • DOI: 10.1086/500659

In-orbit performance and calibration of the Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA)
conference, October 1996

  • Jahoda, Keith; Swank, Jean H.; Giles, Alan B.
  • SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, SPIE Proceedings
  • DOI: 10.1117/12.256034

Possible implications of mass accretion in Eta Carinae
journal, January 2009


Hard X-ray emission from η Carinae
journal, December 2007


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

Super-Hard X-Ray Emission from η Carinae Observed with Suzaku
journal, August 2009

  • Sekiguchi, Akiko; Tsujimoto, Masahiro; Kitamoto, Shunji
  • Publications of the Astronomical Society of Japan, Vol. 61, Issue 4
  • DOI: 10.1093/pasj/61.4.629

Propagation of Cosmic‐Ray Nucleons in the Galaxy
journal, December 1998

  • Strong, Andrew W.; Moskalenko, Igor V.
  • The Astrophysical Journal, Vol. 509, Issue 1
  • DOI: 10.1086/306470

Second COS B catalog of high-energy gamma-ray sources
journal, January 1981

  • Swanenburg, B. N.; Bennett, K.; Bignami, G. F.
  • The Astrophysical Journal, Vol. 243
  • DOI: 10.1086/183445

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


Searches for millisecond pulsations in low-mass X-ray binaries, 2
journal, November 1994

  • Vaughan, B. A.; van der Klis, M.; Wood, K. S.
  • The Astrophysical Journal, Vol. 435
  • DOI: 10.1086/174818

    Works referencing / citing this record:

    Non-thermal X-rays from colliding wind shock acceleration in the massive binary Eta Carinae
    journal, July 2018

    • Hamaguchi, Kenji; Corcoran, Michael F.; Pittard, Julian M.
    • Nature Astronomy, Vol. 2, Issue 9
    • DOI: 10.1038/s41550-018-0505-1

    HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae: HESS observations of the Carina nebula
    journal, June 2012


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


    Second AGILE catalogue of gamma-ray sources
    journal, June 2019


    Non-thermal X-rays from colliding wind shock acceleration in the massive binary Eta Carinae
    journal, July 2018

    • Hamaguchi, Kenji; Corcoran, Michael F.; Pittard, Julian M.
    • Nature Astronomy, Vol. 2, Issue 9
    • DOI: 10.1038/s41550-018-0505-1

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


    Second AGILE catalogue of gamma-ray sources
    journal, June 2019


    HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae: HESS observations of the Carina nebula
    journal, June 2012


    Colliding-wind binary systems: diffusive shock acceleration and non-thermal emission
    journal, April 2020

    • Pittard, J. M.; Vila, G. S.; Romero, G. E.
    • Monthly Notices of the Royal Astronomical Society, Vol. 495, Issue 2
    • DOI: 10.1093/mnras/staa1099