43 research outputs found
The camera of the fifth H.E.S.S. telescope. Part I: System description
Full text linkIn July 2012, as the four ground-based gamma-ray telescopes of the H.E.S.S.
(High Energy Stereoscopic System) array reached their tenth year of operation
in Khomas Highlands, Namibia, a fifth telescope took its first data as part of
the system. This new Cherenkov detector, comprising a 614.5 m^2 reflector with
a highly pixelized camera in its focal plane, improves the sensitivity of the
current array by a factor two and extends its energy domain down to a few tens
of GeV.
The present part I of the paper gives a detailed description of the fifth
H.E.S.S. telescope's camera, presenting the details of both the hardware and
the software, emphasizing the main improvements as compared to previous
H.E.S.S. camera technology.Comment: 16 pages, 13 figures, accepted for publication in NIM
An elastic lidar system for the H.E.S.S. Experiment
No full textInternational audienceThe H.E.S.S. experiment in Namibia, Africa, is a high energy gamma ray telescope sensitive in the energy range from ~100 Gev to a few tens of TeV, via the use of the atmospheric Cherenkov technique. To minimize the systematic errors on the derived fluxes of the measured sources, one has to calculate the impact of the atmospheric properties, in particular the extinction parameter of the Cherenkov light (~300–650 nm) exploited to observe and reconstruct atmospheric particle showers initiated by gamma-ray photons. A lidar can provide this kind of information for some given wavelengths within this range. In this paper we report on the hardware components, operation and data acquisition of such a system installed at the H.E.S.S. site
A Provenance Data Model for Astronomy
No full texthttp://www.aspbooks.org/publications/521/450.pdfInternational audienceIn Astronomy as well as in other sciences it is of crucial importance to have information about the origin and history of data, i.e. its provenance information. The IVOA Provenance Data Model shall record this information in a consistent and interoperable way for astronomical data. This will enable scientists to use common tools for discovering data based on their provenance and help them to gain a better understanding of the data, its processing and to judge the data's quality and reliability
A Provenance Data Model for Astronomy
No full texthttp://www.aspbooks.org/publications/521/450.pdfInternational audienceIn Astronomy as well as in other sciences it is of crucial importance to have information about the origin and history of data, i.e. its provenance information. The IVOA Provenance Data Model shall record this information in a consistent and interoperable way for astronomical data. This will enable scientists to use common tools for discovering data based on their provenance and help them to gain a better understanding of the data, its processing and to judge the data's quality and reliability
Provenance Tools for Astronomy
No full textInternational audienceIn the context of astronomy projects, scientists have been confronted with the problem of describing in a standardized way how their data have been produced. <P />As presented in a talk at last year's ADASS, the International Virtual Observatory Alliance (IVOA) is working on the definition of a Provenance Data Model, compatible with the W3C PROV model, which shall describe how provenance metadata can be modeled, stored and exchanged in astronomy. <P />In this poster, we present the current status of our developments of libraries and tools, mainly open source, which implement the IVOA Provenance Data Model in order to produce, serve, load and visualize provenance information. These implementations are also needed to validate and adjust the data model and the standard definitions for accessing provenance. The provenance tools developed and created for the W3C framework are reused and extended when possible to tackle the domain of astronomical data
ProvTAP: A TAP Service for Providing IVOA Provenance Metadata
No full textInternational audienceIn the astronomical Virtual Observatory, provenance metadata provide information on the processing history of the data. This is important to assert quality and truthfulness of the data, and potentially be able to replay some of the processing steps. The ProvTAP specification is an IVOA Working draft defining how to serve provenance metadata via TAP, the Table Acces Protocol, which allows to query table and catalog services via the Astronomical Data Query Language (ADQL). ProvTAP services should allow finding out all activities, entities, or agents that fulfill certain conditions. Several implementations and developments are presented. The CDS ProvTAP service describes provenance metadata for the generation of HiPS image datasets. The CTA ProvTAP service will provide access to metadata describing the processing of CTA event lists. ARI-GAVO prototyped specialized query functions that could facilitate accomplishing the goals of ProvTAP users
Provenance Tools for Astronomy
No full textInternational audienceIn the context of astronomy projects, scientists have been confronted with the problem of describing in a standardized way how their data have been produced. <P />As presented in a talk at last year's ADASS, the International Virtual Observatory Alliance (IVOA) is working on the definition of a Provenance Data Model, compatible with the W3C PROV model, which shall describe how provenance metadata can be modeled, stored and exchanged in astronomy. <P />In this poster, we present the current status of our developments of libraries and tools, mainly open source, which implement the IVOA Provenance Data Model in order to produce, serve, load and visualize provenance information. These implementations are also needed to validate and adjust the data model and the standard definitions for accessing provenance. The provenance tools developed and created for the W3C framework are reused and extended when possible to tackle the domain of astronomical data
