dc.contributor.author | Abramowski, A. | |
dc.contributor.author | Büsching, I. | |
dc.contributor.author | Casanova, S. | |
dc.contributor.author | Pekeur, N.W. | |
dc.contributor.author | Sheidaei, F. | |
dc.contributor.author | Venter, C. | |
dc.contributor.author | Vorster, M. | |
dc.contributor.author | H.E.S.S. Collaboration | |
dc.date.accessioned | 2016-05-27T13:15:09Z | |
dc.date.available | 2016-05-27T13:15:09Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Abramowski, A. et al. 2012. HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae. Monthly notices of the Royal Astronomical Society, 424:128-135. [https://doi.org/10.1111/j.1365-2966.2012.21180.x] | en_US |
dc.identifier.issn | 0035-8711 | |
dc.identifier.issn | 1365-2966 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/17532 | |
dc.identifier.uri | http://mnras.oxfordjournals.org/content/424/1/128.full | |
dc.identifier.uri | https://doi.org/10.1111/j.1365-2966.2012.21180.x | |
dc.description.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 ≥ 100 GeV)
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 7.7 × 10−13 ph cm−2 s−1 (99 per
cent confidence level) is derived above the energy threshold of 470 GeV. Together with the
detection of high energy (HE; 0.1 ≤ E ≤ 100 GeV) γ -ray emission by the Fermi Large Area
Telescope up to 100 GeV, 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 4.2 × 10−12 ph cm−2 s−1 (99 per 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 | en_US |
dc.language.iso | en | en_US |
dc.publisher | Oxford Univ Press | en_US |
dc.subject | ISM: individual objects: Carina nebula | en_US |
dc.subject | ISM: individual objects: Eta Carina | en_US |
dc.subject | open clusters and associations: general | en_US |
dc.subject | acceleration of particles | en_US |
dc.subject | radiation mechanisms: non-thermal | en_US |
dc.subject | X-rays: binaries | en_US |
dc.title | HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 22050574 - Pekeur, Nicolette Whilna | |
dc.contributor.researchID | 12006653 - Venter, Christo | |
dc.contributor.researchID | 13235176 - Büsching, Ingo | |
dc.contributor.researchID | 23909196 - Casanova, Sabrina | |
dc.contributor.researchID | 22164405 - Sheidaei, Farzaneh | |
dc.contributor.researchID | 12792322 - Vorster, Michael Johannes | |