Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
Other Titles: Discovery of extended VHE gamma-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
Author: Maxted, N.
Nicholas, B.
Rowell, G.
Citation: Astronomy and Astrophysics: a European journal, 2012; 537:A114-1-A114-11
Publisher: EDP Sciences
Issue Date: 2012
ISSN: 0004-6361
Statement of
H.E.S.S. Collaboration: A. Abramowski ... N. Maxted ... B. Nicholas ... G. Rowell ... et al.
Abstract: Aims. Results obtained in very-high-energy (VHE; E ≥ 100 GeV) γ-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in the vicinity of the young massive stellar cluster Westerlund 1 (Wd 1). Methods. Imaging of Cherenkov light from γ-ray induced particle cascades in the Earth’s atmosphere is used to search for VHE γ rays from the region around Wd 1. Possible catalogued counterparts are searched for and discussed in terms of morphology and energetics of the H.E.S.S. source. Results. The detection of the degree-scale extended VHE γ-ray source HESS J1646–458 is reported based on 45 h of H.E.S.S. observations performed between 2004 and 2008. The VHE γ-ray source is centred on the nominal position of Wd 1 and detected with a total statistical significance of ~20σ. The emission region clearly extends beyond the H.E.S.S. point-spread function (PSF). The differential energy spectrum follows a power law in energy with an index of Γ = 2.19 ± 0.08stat ± 0.20sys and a flux normalisation at 1 TeV of Φ0 = (9.0 ± 1.4stat ± 1.8sys) × 10⁻¹²   TeV⁻¹ cm⁻²  s⁻¹. The integral flux above 0.2 TeV amounts to (5.2 ± 0.9) × 10⁻¹¹   cm⁻²   s⁻¹. Conclusions. Four objects coincident with HESS J1646–458 are discussed in the search of a counterpart, namely the magnetar CXOU J164710.2 − 455216, the X-ray binary 4U 1642–45, the pulsar PSR J1648–4611 and the massive stellar cluster Wd 1. In a single-source scenario, Wd 1 is favoured as site of VHE particle acceleration. Here, a hadronic parent population would be accelerated within the stellar cluster. Beside this, there is evidence for a multi-source origin, where a scenario involving PSR J1648–4611 could be viable to explain parts of the VHE γ-ray emission of HESS J1646–458.
Keywords: open clusters and associations: general
gamma rays: stars
astroparticle physics
Rights: © ESO 2012
DOI: 10.1051/0004-6361/201117928
Appears in Collections:Aurora harvest
IPAS publications

Files in This Item:
File Description SizeFormat 
hdl_71351.pdfPublished version1.65 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.