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Title: Constraints on the non-thermal emission from eta Carinae's blast wave of 1843
Authors: Skilton, J. L.
Domainko, W.
Hinton, J. A.
Jones, D. I.
Ohm, S.
Urquhart, J. S.
First Published: Mar-2012
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2012, 539
Abstract: Non-thermal hard X-ray and high-energy (HE; 1 MeV < E < 100 GeV) γ-ray emission in the direction of η Carinae has been recently detected using the INTEGRAL, AGILE and Fermi satellites. This emission has been interpreted either in the framework of particle acceleration in the colliding wind region between the two massive stars or in the very fast moving blast wave which originates in the historical 1843 “great eruption”. Archival Chandra data has been reanalysed to search for signatures of particle acceleration in η Carinae’s blast wave. No shell-like structure could be detected in hard X-rays and a limit has been placed on the non-thermal X-ray emission from the shell. The time dependence of the target radiation field of the Homunculus is used to develop a single zone model for the blast wave. Attempting to reconcile the X-ray limit with the HE γ-ray emission using this model leads to a very hard electron injection spectrum dN/dE ∝ E − Γ with Γ < 1.8, harder than the canonical value expected from diffusive shock acceleration.
DOI Link: 10.1051/0004-6361/201118434
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2012 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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