Astrophysics and Space Science

, Volume 309, Issue 1–4, pp 17–21 | Cite as

INTEGRAL/XMM views on the MeV source GRO J1411-64

  • Diego F. Torres
  • Shu Zhang
  • Olaf Reimer
  • Xavier Barcons
  • Amalia Corral
  • Valentí Bosch-Ramon
  • Josep M. Paredes
  • Gustavo E. Romero
  • Jin Qu
  • Werner Collmar
  • Volker Schönfelder
  • Yousaf Butt
Original Article

Abstract

The COMPTEL unidentified source GRO J 1411-64 was observed by INTEGRAL and XMM-Newton in 2005. The Circinus Galaxy is the only source detected within the 4σ location error of GRO J1411-64, but in here excluded as the possible counterpart. At soft X-rays, 22 reliable and statistically significant sources (likelihood >10) were extracted and analyzed from XMM-Newton data. Only one of these sources, XMMU J141255.6-635932, is spectrally compatible with GRO J1411-64 although the fact the soft X-ray observations do not cover the full extent of the COMPTEL source position uncertainty make an association hard to quantify and thus risky. At the best location of the source, detections at hard X-rays show only upper limits, which, together with MeV results obtained by COMPTEL suggest the existence of a peak in power output located somewhere between 300–700 keV for the so-called low state. Such a spectrum resembles those in blazars or microquasars, and might suggest at work by the models accordingly. However, an analysis using a microquasar model consisting on a magnetized conical jet filled with relativistic electrons, shows that it is hard to comply with all observational constrains. This fact and the non-detection at hard X-rays introduce an a-posteriori question mark upon the physical reality of this source, what is discussed here.

Keywords

γ-Rays Unidentified γ-ray sources 

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References

  1. Bosch-Ramon, V., Paredes, J.M., Romero, G.E., Torres, D.F.: A microquasar model applied to unidentified gamma-ray sources. Astron. Astrophys. 446, 1081 (2006) CrossRefGoogle Scholar
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  4. Zhang, S., Collmar, W., Schönfelder, V.: An unidentified variable gamma-ray source near the galactic plane detected by COMPTEL. Astron. Astrophys. 396, 923 (2002) CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Diego F. Torres
    • 1
  • Shu Zhang
    • 2
  • Olaf Reimer
    • 3
  • Xavier Barcons
    • 4
  • Amalia Corral
    • 4
  • Valentí Bosch-Ramon
    • 5
  • Josep M. Paredes
    • 5
  • Gustavo E. Romero
    • 6
  • Jin Qu
    • 2
  • Werner Collmar
    • 7
  • Volker Schönfelder
    • 7
  • Yousaf Butt
    • 8
  1. 1.Institució de Recerca i Estudis Avançats (ICREA) & Institut de Ciències de l’Espai (IEEC-CSIC), Facultat de CienciesUniversitat Autònoma de BarcelonaBarcelonaSpain
  2. 2.Laboratory for Particle AstrophysicsInstitute of High Energy PhysicsBeijing 100049China
  3. 3.W.W. Hansen Experimental Physics LaboratoryStanford UniversityStanford, CA 94305USA
  4. 4.Instituto de Física de Cantabria (CSIC-UC)SantanderSpain
  5. 5.Universitat de BarcelonaBarcelonaSpain
  6. 6.Instituto Argentino de Radioastronomia, CC5Villa ElisaArgentina
  7. 7.Max-Planck-Institut für extraterrestrische PhysikGarchingGermany
  8. 8.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA

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