The ArTÈMiS wide-field sub-millimeter camera: preliminary on-sky performance at 350 microns

Vincent RevÈret, Philippe AndrÈ, Jean Le Pennec, Michel Talvard, Patrick AgnËse, AgnËs Arnaud, Laurent Clerc, Carlos de Breuck, Jean-Charles Cigna, Cyrille Delisle, Eric Doumayrou, Lionel Duband, Didier Dubreuil, Luc Dumaye, Eric Ercolani, Pascal Gallais, Elodie Groult, Thierry Jourdan, Bernadette Leriche, Bruno MaffeiMichel Lortholary, JÈrÙme Martignac, Wilfried Rabaud, Johan Relland, Louis Rodriguez, AurÈlie Vandeneynde, FranÁois Visticot

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    ArTeMiS is a wide-field submillimeter camera operating at three wavelengths simultaneously (200, 350 and 450 mum). A preliminary version of the instrument equipped with the 350 mum 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 ArTÈMiS 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 mum and 2◊8 sub-arrays at 350 and 450 mum. 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 mum 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 mum instrument at APEX. The median NEFD at 350 mum 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.
    Original languageEnglish
    Title of host publicationhost publication
    Volume9153
    Publication statusPublished - 2014
    EventSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series -
    Duration: 1 Jan 1824 → …
    http://adsabs.harvard.edu/abs/2012SPIE.8452E..0IO

    Conference

    ConferenceSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
    Period1/01/24 → …
    Internet address

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