Physics – Optics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..447r&link_type=abstract
In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:
Physics
Optics
Interstellar Medium: Dust Grains, Cold Clouds, Star Formation, Galaxy: Continuum Emission, Missions: Elisa, Planck, Herschel
Scientific paper
This paper presents briefly the technical aspects and scientific objectives of the balloon-borne Experiment for Large Infrared Survey Astronomy (ELISA). The emphasis will be put upon the synergies existing between the ELISA project and future space missions, both with respect to technical and scientific aspects. ELISA is a small balloon project for an experiment dedicated to measure the Far-Infrared to submillimeter continuum emission of dust over a large fraction of the sky with unprecedented sensitivity and angular resolution. The primary mirror of the telescope, similar to the one used for the Top-Hat mission, will have a diameter of 1 m, ensuring an angular resolution of about 3.5'. PACS-type bolometers arrays will be used in four photometric bands centered at 170, 240, 400, and 650 μm, and providing a 22'×45' instantaneous field per channel. A liquid He cryostat will host the cold optics, including the secondary mirror of the telescope, as well as the detectors, which will be cooled to 0.3K. Mapping of the sky will be accomplished by rotating the gondola over a large azimuth range (up to 60 degree amplitude). The pointing of the experiment will be maintained to a constant elevation during the azimuth scans through a feed back loop using the signal from a large format, fast stellar sensor, operating day and night. The total mass of the experiment will be lower than 500 kg. The scientific goal of the experiment is to map the diffuse sub-millimeter emission along a large fraction of the Milky Way. The astronomical data obtained will be used to derive the emission properties of the dust grains in the interstellar medium, such as their temperature and emissivity. The measurements will be particularly suited to detect and study the cold component of the Galaxy, and then the first steps toward star formation. It will also allow to systematically measure the polarization of the dust emission and should lead to the detection of a few thousand point sources such as newly formed stars and distand galaxies. In addition to these goals, the ELISA project will serve as a test bed for the detector technology which will be used for the HERSCHEL and the PLANCK space missions to be launched in 2007.
Abergel Alain
Armengaud M.
Bernard J.-Ph.
Boulanger Francois
Crussaire Jean-Pierre
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