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First Emulsion γ-Ray Telescope Imaging of the Vela Pulsar by the GRAINE 2018 Balloon-borne Experiment

Takahashi, Satoru Aoki, Shigeki Iyono, Atsushi Karasuno, Ayaka Kodama, Kohichi Komatani, Ryosuke Komatsu, Masahiro Komiyama, Masahiro Kuretsubo, Kenji Marushima, Toshitsugu Matsuda, Syota Morishima, Kunihiro Morishita, Misaki Naganawa, Naotaka Nakamura, Mitsuhiro Nakamura, Motoya Nakamura, Takafumi Nakamura, Yuya Nakano, Noboru Nakano, Toshiyuki Nakazawa, Kazuma Nishio, Akira Oda, Miyuki Rokujo, Hiroki Sato, Osamu Sugimura, Kou Suzuki, Atsumu Torii, Mayu Yamamoto, Saya Yoshimoto, Masahiro 神戸大学

2023.12.21

概要

We are developing the Gamma-Ray Astro-Imager with Nuclear Emulsion project, designed for 10 MeV–100 GeV cosmic γ-ray observations with a high angular resolution (5'/0:[fdg]08 at 1–2 GeV) and a polarization-sensitive large-aperture (∼10 ㎡) emulsion telescope for repeated long-duration balloon flights. In 2018, a balloon-borne experiment was carried out in Australia with a 0.38 ㎡ sensitive area and a flight duration of 17.4 hr, including 6.7 hr of Vela observations. Significant improvements compared with the 2015 balloon-borne experiment were achieved by a factor of 5, including both an increase in effective area × time and a reduction in the background contribution. We aimed to demonstrate the telescope's overall performance based on detection and imaging of a known γ-ray source, the Vela pulsar. A robust detection of the Vela pulsar was achieved with a 68% containment radius of 0:[fdg]42, at a significance of 6σ, at energies above 80 MeV. The resulting angular profile is consistent with that of a pointlike source. We achieved the current best imaging performance of the Vela pulsar using an emulsion γ-ray telescope with the highest angular resolution of any γ-ray telescope to date.

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First Emulsion γ-Ray Telescope Imaging of the Vela Pulsar by the GRAINE 2018 Balloon-borne Experiment

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First Emulsion γ-Ray Telescope Imaging of the Vela Pulsar by the GRAINE 2018 Balloon-borne Experiment

概要

この論文で使われている画像

関連論文

Very-high-energy gamma-ray observations of blazars with the MAGIC telescopes and performance study of the next-generation atmospheric Cherenkov telescope CTA-LST

First Observation of the MeV Gamma-Ray Universe with Bijective Imaging Spectroscopy Using the Electron-tracking Compton Telescope on Board SMILE-2+

8. Neutron Radiography and Radiation Application

2. Nuclear Physics and Nuclear Data

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参考文献