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https://hdl.handle.net/2440/57834
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Type: | Journal article |
Title: | Search for VHE gamma rays from SS433/W50 with the CANGAROO-II telescope |
Author: | Hayashi, S. Kajino, F. Naito, T. Asahara, A. Bicknell, G. Clay, R. Doi, Y. Edwards, P. Enomoto, R. Gunji, S. Hara, S. Hara, T. Hattori, T. Itoh, C. Kabuki, S. Katagiri, H. Kawachi, A. Kifune, T. Ksenofontov, L. Kubo, H. et al. |
Citation: | Astroparticle Physics, 2009; 32(2):112-119 |
Publisher: | Elsevier Science BV |
Issue Date: | 2009 |
ISSN: | 0927-6505 |
Statement of Responsibility: | Sei. Hayashi... R.W. Clay... J.R. Patterson, R.J. Protheroe... D.L. Swaby... G. Thornton... et al. |
Abstract: | SS433, located at the center of the supernova remnant W50, is a close proximity binary system consisting of a compact star and a normal star. Jets of material are directed outwards from the vicinity of the compact star symmetrically to the east and west. Non-thermal hard X-ray emission is detected from lobes lying on both sides. Shock accelerated electrons are expected to generate VHE gamma rays through the inverse-Compton process in the lobes. Observations of the western X-ray lobe region of SS433/W50 system have been performed to detect VHE gamma rays using the 10 m CANGAROO-II telescope in August and September, 2001, and July and September, 2002. The total observation times are 85.2 h for ON source, and 80.8 h for OFF source data. No significant excess of VHE gamma rays has been found at three regions of the western X-ray lobe of SS433/W50 system. We have derived 99% confidence level upper limits to the fluxes of gamma rays and have set constraints on the strengths of the magnetic fields assuming the synchrotron/inverse-Compton model for the wide energy range of photon spectrum from radio to TeV. The derived lower limits are 4.3 μG for the center of the brightest X-ray emission region and 6.3 μG for the far end from SS433 in the western X-ray lobe. In addition, we suggest that the spot-like X-ray emission may provide a major contribution to the hardest X-ray spectrum in the lobe. © 2009 Elsevier B.V. All rights reserved. |
Keywords: | Gamma rays: observations ISM: individual (W50), jets Stars: individual (SS433) |
Description: | Copyright © 2009 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.astropartphys.2009.06.006 |
Grant ID: | ARC http://purl.org/au-research/grants/arc/LE0238884 http://purl.org/au-research/grants/arc/DP0345983 |
Published version: | http://dx.doi.org/10.1016/j.astropartphys.2009.06.006 |
Appears in Collections: | Aurora harvest Physics publications |
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