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dc.contributor.authorAcero, F.en_US
dc.contributor.authorBüsching, I.en_US
dc.contributor.authorDavids, I.D.en_US
dc.contributor.authorHolleran, M.en_US
dc.contributor.authorDe Jager, O.C.en_US
dc.contributor.authorRaubenheimer, B.C.en_US
dc.contributor.authorVenter, C.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2010-08-04T15:37:36Z
dc.date.available2010-08-04T15:37:36Z
dc.date.issued2009en_US
dc.identifier.citationAcero, F. et al. 2009. HESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105. Astronomy and astrophysics, 508(3):1135-1140. [https://doi.org/10.1051/0004-6361/200913389]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/3496
dc.identifier.urihttps://doi.org/10.1051/0004-6361/200913389
dc.description.abstractContext. High energy particles reside in the relativistic jets of microquasars, making them possible sources of very high energy radiation (VHE, >100 GeV). Detecting this emission would provide a new handle on jet physics. Aims. Observations of the microquasar GRS 1915+105 with the HESS telescope array were undertaken in 2004–2008 to search for VHE emission. Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the energy and direction of the incident gamma rays. Results. There is no evidence for a VHE gamma-ray signal either from the direction of the microquasar or its vicinity. An upper limit of ph cm-2 s-1 (99.9% confidence level) is set on the photon flux above 410 GeV, equivalent to a VHE luminosity of erg s-1 at 11 kpc. Conclusions. The VHE to X-ray luminosity ratio in GRS 1915+105 is at least four orders of magnitude lower than the ratio observed in gamma-ray binaries. The VHE radiative efficiency of the compact jet is less than 0.01% based on its estimated total power of 1038 erg s-1. Particle acceleration in GRS 1915+105 is not efficient at high energies and/or the magnetic field is too strong. It is also possible that VHE gamma-rays are produced by GRS 1915+105, but the emission is highly time-dependent
dc.publisherEDP Sciences
dc.subjectX-rays: binaries
dc.subjectX-rays: individuals: GRS 1915+105
dc.subjectGamma rays: observations
dc.titleHESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105en_US
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID10179240 - Raubenheimer, Barend Christoffel
dc.contributor.researchID10859748 - Holleran, Mathew
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis
dc.contributor.researchID13235176 - Büsching, Ingo
dc.contributor.researchID13146629 - Davids, Isak Delberth


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