Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/74846
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae |
Author: | Maxted, N. Nicholas, B. Rowell, G. |
Citation: | Monthly Notices of the Royal Astronomical Society, 2012; 424(1):128-135 |
Publisher: | Blackwell Publishing Ltd |
Issue Date: | 2012 |
ISSN: | 0035-8711 1365-2966 |
Statement of Responsibility: | HESS Collaboration... N. Maxted... B. Nicholas... G. Rowell... et al. |
Abstract: | The massive binary system Eta Carinae and the surrounding Hii complex, the Carina nebula, are potential particle acceleration sites from which very high energy (VHE; E≥ 100GeV) γ-ray emission could be expected. This paper presents data collected during VHE γ-ray observations with the HESS telescope array from 2004 to 2010, which cover a full orbit of Eta Carinae. In the 33.1-h data set no hint of significant γ-ray emission from Eta Carinae has been found and an upper limit on the γ-ray flux of (99per cent confidence level) is derived above the energy threshold of 470GeV. Together with the detection of high energy (HE; 0.1 ≤E≤ 100GeV) γ-ray emission by the Fermi Large Area Telescope up to 100GeV, and assuming a continuation of the average HE spectral index into the VHE domain, these results imply a cut-off in the γ-ray spectrum between the HE and VHE γ-ray range. This could be caused either by a cut-off in the accelerated particle distribution or by severe γ-γ absorption losses in the wind collision region. Furthermore, the search for extended γ-ray emission from the Carina nebula resulted in an upper limit on the γ-ray flux of (99per cent confidence level). The derived upper limit of ∼23 on the cosmic ray enhancement factor is compared with results found for the old-age mixed-morphology supernova remnant W28. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS. |
Keywords: | acceleration of particles – radiation mechanisms non-thermal – ISM individual objects Carina nebula – ISM Eta Carina – open clusters and associations general – X-rays binaries. |
Rights: | © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS |
DOI: | 10.1111/j.1365-2966.2012.21180.x |
Published version: | http://dx.doi.org/10.1111/j.1365-2966.2012.21180.x |
Appears in Collections: | Aurora harvest IPAS publications Physics publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.