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Proceedings Paper

Development of a new calibration method for ground-based Paschen-alpha imaging data
Author(s): Ken Tateuchi; Kentaro Motohara; Masahiro Konishi; Hidenori Takahashi; Natsuko Kato; Ryou Ohsawa; Kitagawa Yutaro; Yuzuru Yoshii; Mamoru Doi; Toshihiro Handa; Kotaro Kohno; Kimiaki Kawara; Masuo Tanaka; Takashi Miyata; Takeo Minezaki; Shigeyuki Sako; Toshihiko Tanabe; Tomoki Morokuma; Yoichi Tamura; Tsutomu Aoki; Takao Soyano; Ken'ichi Tarusawa; Shintaro Koshida; Takafumi Kamizuka; Tomohiko Nakamura; Kentaro Asano; Mizuho Uchiyama
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Paper Abstract

ANIR (Atacama Near InfraRed camera) is a near infrared camera for the University of Tokyo Atacama 1.0m telescope installed at the summit of Co. Chajnantor (5640m altitude) in northern Chile. The high altitude and the extremely low water vapor (precipitable water vapor:PWV=0.5mm) of the site enables us to perform observation of hydrogen Paschen alpha (Paα) emission line at 1.8751 μm. Since the first light observation in June 2009, we have succesfully obtained Paα narrow-band images of Galactic objects and near-by Galaxies. However, as there are many atmospheric absorption features within the wavelength range of the narrow-band filters which vary temporally due to change of PWV, it is difficult to calibrate the emission line flux accurately. Therefore, we have developed a new method to restore Paα emission-line flux from ground-based narrow-band filter imaging observations. First, average atmospheric transmittance within the narrow-band filter is derived using 2MASS stars in a image. Second, PWV is then estimated by comparing the transmittance with that calculated by atmospheric transmittance model software, ATRAN. Finally, the atmospheric transmittance at the wavelength of Paα emission-line is obtained from the model atmosphere corresponding to the obtained PWV. By applying this method to the data of nearby Luminous Infrared Galaxies obtained by ANIR, the emission line strength is estimated within the accuracy of 10% relative to that observed by HST/NICMOS. In this paper, we describe details of the calibration method and its accuracy.

Paper Details

Date Published: 24 September 2012
PDF: 11 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84467D (24 September 2012); doi: 10.1117/12.924263
Show Author Affiliations
Ken Tateuchi, Institute of Astronomy, The Univ. of Tokyo (Japan)
Kentaro Motohara, Institute of Astronomy, The Univ. of Tokyo (Japan)
Masahiro Konishi, Institute of Astronomy, The Univ. of Tokyo (Japan)
Hidenori Takahashi, Institute of Astronomy, The Univ. of Tokyo (Japan)
Natsuko Kato, Institute of Astronomy, The Univ. of Tokyo (Japan)
Ryou Ohsawa, The Univ. of Tokyo (Japan)
Kitagawa Yutaro, Institute of Astronomy, The Univ. of Tokyo (Japan)
Yuzuru Yoshii, Institute of Astronomy, The Univ. of Tokyo (Japan)
Mamoru Doi, Institute of Astronomy, The Univ. of Tokyo (Japan)
Toshihiro Handa, Kagoshima Univ. (Japan)
Kotaro Kohno, Institute of Astronomy, The Univ. of Tokyo (Japan)
Kimiaki Kawara, Institute of Astronomy, The Univ. of Tokyo (Japan)
Masuo Tanaka, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takashi Miyata, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takeo Minezaki, Institute of Astronomy, The Univ. of Tokyo (Japan)
Shigeyuki Sako, Institute of Astronomy, The Univ. of Tokyo (Japan)
Toshihiko Tanabe, Institute of Astronomy, The Univ. of Tokyo (Japan)
Tomoki Morokuma, Institute of Astronomy, The Univ. of Tokyo (Japan)
Yoichi Tamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
Tsutomu Aoki, Kiso Observatory, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takao Soyano, Kiso Observatory, Institute of Astronomy, The Univ. of Tokyo (Japan)
Ken'ichi Tarusawa, Kiso Observatory, Institute of Astronomy, The Univ. of Tokyo (Japan)
Shintaro Koshida, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takafumi Kamizuka, Institute of Astronomy, The Univ. of Tokyo (Japan)
Tomohiko Nakamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
Kentaro Asano, Institute of Astronomy, The Univ. of Tokyo (Japan)
Mizuho Uchiyama, Institute of Astronomy, The Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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