First Paschen alpha imaging from the ground: The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope

Kentaro Motohara; Masahiro Konishi; Koji Toshikawa; Natsuko Mitani; Shigeyuki Sako; Yuka K. Uchimoto; Tomoyasu Yamamuro; Takeo Minezaki; Toshihiko Tanabe; Takashi Miyata; Shintaro Koshida; Daisuke Kato; Ryo Ohsawa; Tomohiko Nakamura; Kentaro Asano; Yuzuru Yoshii; Mamoru Doi; Kotaro Kohno; Masuo Tanaka; Kimiaki Kawara; Toshihiro Handa; Tsutomu Aoki; Takao Soyano; Ken'Ichi Tarusawa; Yoshifusa Ita

doi:10.1117/12.856102

First Paschen alpha imaging from the ground: The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope

Kentaro Motohara, Masahiro Konishi, Koji Toshikawa, Natsuko Mitani, Shigeyuki Sako, Yuka K. Uchimoto, Tomoyasu Yamamuro, Takeo Minezaki, Toshihiko Tanabe, Takashi Miyata, Shintaro Koshida, Daisuke Kato, Ryo Ohsawa, Tomohiko Nakamura, Kentaro Asano, Yuzuru Yoshii, Mamoru Doi, Kotaro Kohno, Masuo Tanaka, Kimiaki KawaraToshihiro Handa, Tsutomu Aoki, Takao Soyano, Ken'Ichi Tarusawa, Yoshifusa Ita

SCI - Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

15 Citations (Scopus)

Abstract

We have developed a near infrared camera called ANIR (Atacama 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 camera is based on a PACE HAWAII-2 array with an Offner relay optics for re-imaging, and field of view is 5'. 3 × 5'. 3 with pixel scale of 0''. 31/pix. It is also capable of optical/infrared simultaneous imaging by inserting a dichroic mirror before the focal plane. The high altitude and extremely low water vapor (PWV=0.5mm) of the site enables us to perform observation of hydrogen Paschenα (Paα) emission line at 1.8751 μm. The first light observation was carried out in July 2009, and we have successfully obtained Paα images of the Galactic center using the N1875 narrow-band filter. This is the first success of Paα imaging of a Galactic object from a ground based telescope. System efficiencies for the broad-band filters are measured to be 15% at the J-band and 30% at Ks, while that of the N1875 narrow-band filter, corresponding to Paα; wavelength, varies from 8 to 15%, which may be caused by fluctuation of the atmospheric transmittance. ATRAN simulation suggests that this corresponds to PWV of 0.3 - 1.5mm, consistent with previous results of the site testing. Measured seeing size is median ∼0''. 8, corresponding to the real seeing value of 0''. 6 - 0''. 8. These results demonstrates the excellent capability of the site for infrared observations.

Original language	English
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy III
Edition	PART 1
DOIs	https://doi.org/10.1117/12.856102
Publication status	Published - 2010 Nov 12
Event	Ground-Based and Airborne Instrumentation for Astronomy III - San Diego, CA, United States Duration: 2010 Jun 27 → 2010 Jul 2

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Number	PART 1
Volume	7735
ISSN (Print)	0277-786X

Other

Other	Ground-Based and Airborne Instrumentation for Astronomy III
Country	United States
City	San Diego, CA
Period	10/6/27 → 10/7/2

Keywords

Atacama
Co. Chajnantor
PWV
Paschen alpha
imager
near infrared

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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Motohara, K., Konishi, M., Toshikawa, K., Mitani, N., Sako, S., Uchimoto, Y. K., Yamamuro, T., Minezaki, T., Tanabe, T., Miyata, T., Koshida, S., Kato, D., Ohsawa, R., Nakamura, T., Asano, K., Yoshii, Y., Doi, M., Kohno, K., Tanaka, M., ... Ita, Y. (2010). First Paschen alpha imaging from the ground: The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope. In Ground-Based and Airborne Instrumentation for Astronomy III (PART 1 ed.). [77353K] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7735, No. PART 1). https://doi.org/10.1117/12.856102

First Paschen alpha imaging from the ground : The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope. / Motohara, Kentaro; Konishi, Masahiro; Toshikawa, Koji; Mitani, Natsuko; Sako, Shigeyuki; Uchimoto, Yuka K.; Yamamuro, Tomoyasu; Minezaki, Takeo; Tanabe, Toshihiko; Miyata, Takashi; Koshida, Shintaro; Kato, Daisuke; Ohsawa, Ryo; Nakamura, Tomohiko; Asano, Kentaro; Yoshii, Yuzuru; Doi, Mamoru; Kohno, Kotaro; Tanaka, Masuo; Kawara, Kimiaki; Handa, Toshihiro; Aoki, Tsutomu; Soyano, Takao; Tarusawa, Ken'Ichi; Ita, Yoshifusa.

Ground-Based and Airborne Instrumentation for Astronomy III. PART 1. ed. 2010. 77353K (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7735, No. PART 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Motohara, K, Konishi, M, Toshikawa, K, Mitani, N, Sako, S, Uchimoto, YK, Yamamuro, T, Minezaki, T, Tanabe, T, Miyata, T, Koshida, S, Kato, D, Ohsawa, R, Nakamura, T, Asano, K, Yoshii, Y, Doi, M, Kohno, K, Tanaka, M, Kawara, K, Handa, T, Aoki, T, Soyano, T, Tarusawa, KI & Ita, Y 2010, First Paschen alpha imaging from the ground: The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope. in Ground-Based and Airborne Instrumentation for Astronomy III. PART 1 edn, 77353K, Proceedings of SPIE - The International Society for Optical Engineering, no. PART 1, vol. 7735, Ground-Based and Airborne Instrumentation for Astronomy III, San Diego, CA, United States, 10/6/27. https://doi.org/10.1117/12.856102

Motohara K, Konishi M, Toshikawa K, Mitani N, Sako S, Uchimoto YK et al. First Paschen alpha imaging from the ground: The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope. In Ground-Based and Airborne Instrumentation for Astronomy III. PART 1 ed. 2010. 77353K. (Proceedings of SPIE - The International Society for Optical Engineering; PART 1). https://doi.org/10.1117/12.856102

Motohara, Kentaro ; Konishi, Masahiro ; Toshikawa, Koji ; Mitani, Natsuko ; Sako, Shigeyuki ; Uchimoto, Yuka K. ; Yamamuro, Tomoyasu ; Minezaki, Takeo ; Tanabe, Toshihiko ; Miyata, Takashi ; Koshida, Shintaro ; Kato, Daisuke ; Ohsawa, Ryo ; Nakamura, Tomohiko ; Asano, Kentaro ; Yoshii, Yuzuru ; Doi, Mamoru ; Kohno, Kotaro ; Tanaka, Masuo ; Kawara, Kimiaki ; Handa, Toshihiro ; Aoki, Tsutomu ; Soyano, Takao ; Tarusawa, Ken'Ichi ; Ita, Yoshifusa. / First Paschen alpha imaging from the ground : The first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope. Ground-Based and Airborne Instrumentation for Astronomy III. PART 1. ed. 2010. (Proceedings of SPIE - The International Society for Optical Engineering; PART 1).

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abstract = "We have developed a near infrared camera called ANIR (Atacama 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 camera is based on a PACE HAWAII-2 array with an Offner relay optics for re-imaging, and field of view is 5'. 3 × 5'. 3 with pixel scale of 0''. 31/pix. It is also capable of optical/infrared simultaneous imaging by inserting a dichroic mirror before the focal plane. The high altitude and extremely low water vapor (PWV=0.5mm) of the site enables us to perform observation of hydrogen Paschenα (Paα) emission line at 1.8751 μm. The first light observation was carried out in July 2009, and we have successfully obtained Paα images of the Galactic center using the N1875 narrow-band filter. This is the first success of Paα imaging of a Galactic object from a ground based telescope. System efficiencies for the broad-band filters are measured to be 15% at the J-band and 30% at Ks, while that of the N1875 narrow-band filter, corresponding to Paα; wavelength, varies from 8 to 15%, which may be caused by fluctuation of the atmospheric transmittance. ATRAN simulation suggests that this corresponds to PWV of 0.3 - 1.5mm, consistent with previous results of the site testing. Measured seeing size is median ∼0''. 8, corresponding to the real seeing value of 0''. 6 - 0''. 8. These results demonstrates the excellent capability of the site for infrared observations.",

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author = "Kentaro Motohara and Masahiro Konishi and Koji Toshikawa and Natsuko Mitani and Shigeyuki Sako and Uchimoto, {Yuka K.} and Tomoyasu Yamamuro and Takeo Minezaki and Toshihiko Tanabe and Takashi Miyata and Shintaro Koshida and Daisuke Kato and Ryo Ohsawa and Tomohiko Nakamura and Kentaro Asano and Yuzuru Yoshii and Mamoru Doi and Kotaro Kohno and Masuo Tanaka and Kimiaki Kawara and Toshihiro Handa and Tsutomu Aoki and Takao Soyano and Ken'Ichi Tarusawa and Yoshifusa Ita",

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AU - Mitani, Natsuko

AU - Sako, Shigeyuki

AU - Uchimoto, Yuka K.

AU - Yamamuro, Tomoyasu

AU - Minezaki, Takeo

AU - Tanabe, Toshihiko

AU - Miyata, Takashi

AU - Koshida, Shintaro

AU - Kato, Daisuke

AU - Ohsawa, Ryo

AU - Nakamura, Tomohiko

AU - Asano, Kentaro

AU - Yoshii, Yuzuru

AU - Doi, Mamoru

AU - Kohno, Kotaro

AU - Tanaka, Masuo

AU - Kawara, Kimiaki

AU - Handa, Toshihiro

AU - Aoki, Tsutomu

AU - Soyano, Takao

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