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Type: Conference paper
Title: H.E.S.S observations of the microquasars Cir X-1, Cyg X-1 and 4U 1755-33
Author: Nicholas, B.
Rowell, G.
Citation: Proceedings of the 4th International Symposium on High Energy Gamma-Ray Astronomy held in Heidelberg, Germany 2008: pp.245-248
Publisher: AIP
Publisher Place: USA
Issue Date: 2009
Series/Report no.: AIP Conference Proceedings ; 1085
ISBN: 9780735406162
ISSN: 0094-243X
Conference Name: International Symposium on High Energy Gamma-Ray Astronomy (4th : 2008 : Heidelberg, Germany)
Editor: Aharonian, F.A.
Hofmann, W.
Rieger, F.M.
Statement of
B. Nicholas and G. Rowell (on behalf of the H.E.S.S Collaboration)
Abstract: A number of microquasars exhibit parsec-scale jets, which in some cases are known to interact with the interstellar medium (ISM). A famous example is the SS-433 system. Here, we summarise H.E.S.S. observations of three further examples in this category with arc-minute scale jets and/or jet/ISM interaction features. The small line-of-sight angle in the Cir X-l jet makes this source a potential 'microblazar'. An arc-minute bow-shock radio feature has been blown out by the Cyg X-1 jet, and the MAGIC telescope has also detected a VHE flare on 24 Sept. 2006 from Cyg X-1 (H.E.S.S. obs. were taken ∼1 month earlier). Persistent bi-lobal (∼7 arcmin long) 'fossil' jets of 4U1755-33 have been seen in X-rays. This report summarises our observations, searching for pointlike VHE emission at the central sources and for extended emission from their jets and/or jet/ISM interaction regions. © 2009 American Institute of Physics.
Keywords: gamma-rays
black holes
Rights: ©2009 American Institute of Physics
DOI: 10.1063/1.3076651
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