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Proceedings Paper

SIRPOL: a JHKs-simultaneous imaging polarimeter for the IRSF 1.4-m telescope
Author(s): Ryo Kandori; Nobuhiko Kusakabe; Motohide Tamura; Yasushi Nakajima; Takahiro Nagayama; Chie Nagashima; Jun Hashimoto; Jim Hough; Shuji Sato; Tetsuya Nagata; Akika Ishihara; Phil Lucas; Misato Fukagawa
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Paper Abstract

We describe a polarimeter for the near-infrared camera SIRIUS mounted on the IRSF 1.4 m telescope in South Africa. The polarimeter, SIRPOL, consists of an achromatic (1-2.5 μm) wave plate rotator unit and a polarizer located upstream of the camera, both of which are at a room temperature. This minimizes the effect of the mirrors in the camera on instrumental polarization. The combination of the polarimeter with the SIRIUS camera enables a deep (J = 19.2 mag, 5σ in one hour) and wide-field (7.7' × 7.7') imaging polarimetry at JHKs simultaneously. The three color near-infrared polarimetry is useful for understanding the properties of dust grains that cause scattering and absorption in various environments (e.g., star forming regions, late-type stars, and galaxies). Using IRSF and SIRPOL, wide-field near-infrared polarization surveys in various star-forming regions are being conducted, starting from 2006, which aim to study both reflection nebulae associated with young stars and interstellar polarizations of background stars. In this contribution, we describe the hardware and software of SIRPOL and report its first results on the telescope.

Paper Details

Date Published: 28 June 2006
PDF: 9 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626951 (28 June 2006); doi: 10.1117/12.670967
Show Author Affiliations
Ryo Kandori, National Astronomical Observatory of Japan (Japan)
Nobuhiko Kusakabe, National Astronomical Observatory of Japan (Japan)
Graduate Univ. for Advanced Studies (Japan)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Yasushi Nakajima, National Astronomical Observatory of Japan (Japan)
Takahiro Nagayama, Kyoto Univ. (Japan)
Chie Nagashima, Nagoya Univ. (Japan)
Jun Hashimoto, National Astronomical Observatory of Japan (Japan)
Jim Hough, Univ. of Hertfordshire (United Kingdom)
Shuji Sato, Nagoya Univ. (Japan)
Tetsuya Nagata, Kyoto Univ. (Japan)
Akika Ishihara, National Astronomical Observatory of Japan (Japan)
Phil Lucas, Univ. of Hertfordshire (United Kingdom)
Misato Fukagawa, Spitzer Science Ctr., California Institute of Technology (United States)
Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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