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H.E.S.S. Phases I and II. Paula Chadwick, Dept. of Physics University of Durham. High Energy Stereoscopic System – H.E.S.S. Four 13m diameter telescopes Davies-Cotton design, 382 0.6 m diameter mirrors FoV 5 ° 960-pixel cameras Routine operations since January 2004.

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H e s s phases i and ii

H.E.S.S. Phases I and II

Paula Chadwick, Dept. of Physics

University of Durham


High energy stereoscopic system h e s s
High Energy Stereoscopic System – H.E.S.S.

Four 13m diameter telescopes

Davies-Cotton design, 382 0.6 m diameter mirrors

FoV 5°

960-pixel cameras

Routine operations since January 2004

23°16'18'' S, 16°30'00'' E 1.8 km a.s.l


M-PIK Heidelberg; Humboldt University, Berlin; University of Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg

LLR Ecole Polytechnique, LPNHE, PCC College de France, University of Grenoble, CERS Toulouse, CEA Saclay, Observatoire de Paris-Meudon, University of Montpellier II

Durham University, Leeds University

Dublin Institute for Advanced Studies

Charles University, Prague

Yerevan Physics Institute, Armenia

University of Namibia

North-Western University, South Africa

Nicolaus Copernicus Astronomical Centre, Warsaw

Astronomical Observatory, Jagiellonian University, Cracow


Many different categories of object observed with h e s s i
Many Different Categories of Object Observed with H.E.S.S. I Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg

  • Pulsar Wind Nebulae

  • Shell Supernova Remnants

  • Binary systems

  • Young star cluster(s)

  • Galactic centre (inc. diffuse emission)

  • Blazars

  • Radio galaxy/ies

  • Unidentified objects…

The beginnings of source taxonomy


Improvement in sensitivity the crab nebula
Improvement in Sensitivity – Hamburg; Ruhr University, Bochum; Landessternwarte HeidelbergThe Crab Nebula

The Crab Nebula is the ‘standard candle’ in this field – it is a bright, constant source of gamma rays right up to several 10s of TeV.


Pks2155 304 in 2006
PKS2155-304 Hamburg; Ruhr University, Bochum; Landessternwarte Heidelbergin 2006

Preliminary

WOW!

In late July 2006, this AGN produced a burst that made the object on average 7 times brighter than the Crab Nebula. The burst contained over 60,000 gamma rays – c.f. 5134 gamma rays from the Crab detected over lifetime of EGRET.


H.E.S.S. Phase II Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg

Original idea – have an array of 16 telescopes in total….

…it’s also expensive, so how about another 4 telescopes?

Factor of about 2 improvement in area, slightly better angular resolution and 20.5 improvement in sensitivity.

…provides about a factor of 4 extra in area, slightly better angular resolution and a factor of 2-3 in sensitivity.

Hmmm….


HESS II – a single, large (600 m Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg2) telescope.

Lower energy in standalone mode

Improved sensitivity at higher energy in coincidence mode


Telescope structure
Telescope Structure Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg

Altaz mount, rotation on rails

Parabolic mirror, 596 m2, f = 36m

Total weight – 560 tonnes


Trial assembly earlier this year
Trial Assembly Earlier this Year Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg


Central bearings and azimuth rail
Central Bearings and Azimuth Rail Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg


Camera design
Camera Design Hamburg; Ruhr University, Bochum; Landessternwarte Heidelberg



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