23 July 2014 The ArTéMiS wide-field sub-millimeter camera: preliminary on-sky performance at 350 microns
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Abstract
ArTeMiS is a wide-field submillimeter camera operating at three wavelengths simultaneously (200, 350 and 450 μm). A preliminary version of the instrument equipped with the 350 μm focal plane, has been successfully installed and tested on APEX telescope in Chile during the 2013 and 2014 austral winters. This instrument is developed by CEA (Saclay and Grenoble, France), IAS (France) and University of Manchester (UK) in collaboration with ESO. We introduce the mechanical and optical design, as well as the cryogenics and electronics of the ArTéMiS camera. ArTeMiS detectors consist in Si:P:B bolometers arranged in 16×18 sub-arrays operating at 300 mK. These detectors are similar to the ones developed for the Herschel PACS photometer but they are adapted to the high optical load encountered at APEX site. Ultimately, ArTeMiS will contain 4 sub-arrays at 200 μm and 2×8 sub-arrays at 350 and 450 μm. We show preliminary lab measurements like the responsivity of the instrument to hot and cold loads illumination and NEP calculation. Details on the on-sky commissioning runs made in 2013 and 2014 at APEX are shown. We used planets (Mars, Saturn, Uranus) to determine the flat-field and to get the flux calibration. A pointing model was established in the first days of the runs. The average relative pointing accuracy is 3 arcsec. The beam at 350 μm has been estimated to be 8.5 arcsec, which is in good agreement with the beam of the 12 m APEX dish. Several observing modes have been tested, like “On- The-Fly” for beam-maps or large maps, spirals or raster of spirals for compact sources. With this preliminary version of ArTeMiS, we concluded that the mapping speed is already more than 5 times better than the previous 350 μm instrument at APEX. The median NEFD at 350 μm is 600 mJy.s1/2, with best values at 300 mJy.s1/2. The complete instrument with 5760 pixels and optimized settings will be installed during the first half of 2015.
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Vincent Revéret, Vincent Revéret, Philippe André, Philippe André, Jean Le Pennec, Jean Le Pennec, Michel Talvard, Michel Talvard, Patrick Agnèse, Patrick Agnèse, Agnès Arnaud, Agnès Arnaud, Laurent Clerc, Laurent Clerc, Carlos de Breuck, Carlos de Breuck, Jean-Charles Cigna, Jean-Charles Cigna, Cyrille Delisle, Cyrille Delisle, Eric Doumayrou, Eric Doumayrou, Lionel Duband, Lionel Duband, Didier Dubreuil, Didier Dubreuil, Luc Dumaye, Luc Dumaye, Eric Ercolani, Eric Ercolani, Pascal Gallais, Pascal Gallais, Elodie Groult, Elodie Groult, Thierry Jourdan, Thierry Jourdan, Bernadette Leriche, Bernadette Leriche, Bruno Maffei, Bruno Maffei, Michel Lortholary, Michel Lortholary, Jérôme Martignac, Jérôme Martignac, Wilfried Rabaud, Wilfried Rabaud, Johan Relland, Johan Relland, Louis Rodriguez, Louis Rodriguez, Aurélie Vandeneynde, Aurélie Vandeneynde, François Visticot, François Visticot, } "The ArTéMiS wide-field sub-millimeter camera: preliminary on-sky performance at 350 microns", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 915305 (23 July 2014); doi: 10.1117/12.2055985; https://doi.org/10.1117/12.2055985
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