Astrophysics and Space Science

, Volume 309, Issue 1–4, pp 203–207 | Cite as

Demystifying an unidentified EGRET source by VHE gamma-ray observations

Original Article

Abstract

In a novel approach in observational high-energy gamma-ray astronomy, observations carried out by imaging atmospheric Cherenkov telescopes provide necessary templates to pinpoint the nature of intriguing, yet unidentified EGRET gamma-ray sources. Using GeV-photons detected by EGRET and taking advantage of high spatial resolution images from H.E.S.S. observations, we were able to shed new light on the EGRET observed gamma-ray emission in the Kookaburra complex, whose previous coverage in the literature is somewhat contradictory. 3EG J1420–6038 very likely accounts for two GeV gamma-ray sources (E>1 GeV), both in positional coincidence with the recently reported pulsar wind nebulae (PWN) by HESS in the Kookaburra/Rabbit complex. PWN associations at VHE energies, supported by accumulating evidence from observations in the radio and X-ray band, are indicative for the PSR/plerionic origin of spatially coincident, but still unidentified Galactic gamma-ray sources from EGRET. This not only supports the already suggested connection between variable, but unidentified low-latitude gamma-ray sources with pulsar wind nebulae (3EG J1420–6038 has been suggested as PWN candidate previously), it also documents the ability of resolving apparently confused EGRET sources by connecting the GeV emission as measured from a large-aperture space-based gamma-ray instrument with narrow field-of-view but superior spatial resolution observations by ground-based atmospheric Cherenkov telescopes, a very promising identification technique for achieving convincing individual source identifications in the era of GLAST-LAT.

Keywords

EGRET Data analysis GLAST Simulations Pulsars Pulsar wind nebulae 

PACS

98.70.Rz 97.60.Gb 95.85.Pw 98.70.Rz 

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References

  1. Aharonian, F., et al.: Science 309, 746 (2005) CrossRefGoogle Scholar
  2. Aharonian, F., et al.: Astron. Astrophys. 456, 245 (2006) CrossRefGoogle Scholar
  3. Albert, J., et al.: Science 312, 1771 (2006) CrossRefGoogle Scholar
  4. Case, G., Bhattacharya, D.: Astrophys. J. 521, 246 (1999) CrossRefGoogle Scholar
  5. d’Amici, N.: Space Sci. Rev. 36, 195 (1983) CrossRefGoogle Scholar
  6. De Jager, O., et al.: Proc. AIP 304, 72 (1994) Google Scholar
  7. Esposito, J.A., et al.: Astrophys. J. Suppl. Ser. 123, 203 (1999) CrossRefGoogle Scholar
  8. Fichtel, C.E., et al.: Astrophys. J. Suppl. Ser. 94, 551 (1994) CrossRefGoogle Scholar
  9. Hartman, R.C., et al.: Astrophys. J. Suppl. Ser. 123, 79 (1999) CrossRefGoogle Scholar
  10. Lamb, R.C., Macomb, D.: Astrophys. J. 488, 872 (1997) CrossRefGoogle Scholar
  11. McLaughlin, M.A., et al.: Astrophys. J. 473, 763 (1996) CrossRefGoogle Scholar
  12. Mukherjee, R., et al.: Astrophys. J. 542, 740 (2000) CrossRefGoogle Scholar
  13. Ng, C.-Y., et al.: Astrophys. J. 627, 904 (2005) CrossRefGoogle Scholar
  14. Nolan, P.L., et al.: Astrophys. J. 597, 615 (2003) CrossRefGoogle Scholar
  15. Reimer, O., et al.: In: Proceedings 25th ICRC, vol. 3, p. 97 (1997) Google Scholar
  16. Roberts, M., et al.: Astrophys. J. 515, 712 (1999) CrossRefGoogle Scholar
  17. Roberts, M., et al.: Astrophys. J. 561, L187 (2001) CrossRefGoogle Scholar
  18. Sturner, S.J., Dermer, C.D.: Astron. Astrophys. 293, L17 (1995) Google Scholar
  19. Swanenburg, B.N., et al.: Astrophys. J. 143, 69 (1981) CrossRefGoogle Scholar
  20. Thompson, D.J., et al.: Astrophys. J. Suppl. Ser. 101, 259 (1995) CrossRefGoogle Scholar
  21. Thompson, D.J., et al.: Astrophys. J. Suppl. Ser. 107, 227 (1996) CrossRefGoogle Scholar
  22. Torres, D.F., et al.: Astron. Nachr. 322, 223 (2001) CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.W.W. Hansen Experimental Physics Laboratory and Kavli Institute for Particle Astrophysics and CosmologyStanford UniversityStanfordUSA
  2. 2.Kavli Institute for Particle Astrophysics and CosmologySLACMenlo ParkUSA

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