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Large X-ray flares on stars detected with MAXI/GSC: A universal correlation between the duration of a flare and its X-ray luminosity

Tsuboi, Yohko ; Yamazaki, Kyohei ; Sugawara, Yasuharu ; Kawagoe, Atsushi ; Kaneto, Soichiro ; Iizuka, Ryo ; Matsumura, Takanori ; Nakahira, Satoshi ; Higa, Masaya ; Matsuoka, Masaru ; Sugizaki, Mutsumi ; Ueda, Yoshihiro ; Kawai, Nobuyuki ; Morii, Mikio ; Serino, Motoko ; Mihara, Tatehiro ; Tomida, Hiroshi ; Ueno, Shiro ; Negoro, Hitoshi ; Daikyuji, Arata ; Ebisawa, Ken ; Eguchi, Satoshi ; Hiroi, Kazuo ; Ishikawa, Masaki ; Isobe, Naoki ; Kawasaki, Kazuyoshi ; Kimura, Masashi ; Kitayama, Hiroki ; Kohama, Mitsuhiro ; Kotani, Taro ; Nakagawa, Yujin E ; Nakajima, Motoki ; Ozawa, Hiroshi ; Shidatsu, Megumi ; Sootome, Tetsuya ; Sugimori, Kousuke ; Suwa, Fumitoshi ; Tsunemi, Hiroshi ; Usui, Ryuichi ; Yamamoto, Takayuki ; Yamaoka, Kazutaka ; Yoshida, Atsumasa

Publications of the Astronomical Society of Japan, 2016-10, Vol.68 (5) [Periódico revisado por pares]

Oxford University Press

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Título:
Large X-ray flares on stars detected with MAXI/GSC: A universal correlation between the duration of a flare and its X-ray luminosity
Autor: Tsuboi, Yohko ; Yamazaki, Kyohei ; Sugawara, Yasuharu ; Kawagoe, Atsushi ; Kaneto, Soichiro ; Iizuka, Ryo ; Matsumura, Takanori ; Nakahira, Satoshi ; Higa, Masaya ; Matsuoka, Masaru ; Sugizaki, Mutsumi ; Ueda, Yoshihiro ; Kawai, Nobuyuki ; Morii, Mikio ; Serino, Motoko ; Mihara, Tatehiro ; Tomida, Hiroshi ; Ueno, Shiro ; Negoro, Hitoshi ; Daikyuji, Arata ; Ebisawa, Ken ; Eguchi, Satoshi ; Hiroi, Kazuo ; Ishikawa, Masaki ; Isobe, Naoki ; Kawasaki, Kazuyoshi ; Kimura, Masashi ; Kitayama, Hiroki ; Kohama, Mitsuhiro ; Kotani, Taro ; Nakagawa, Yujin E ; Nakajima, Motoki ; Ozawa, Hiroshi ; Shidatsu, Megumi ; Sootome, Tetsuya ; Sugimori, Kousuke ; Suwa, Fumitoshi ; Tsunemi, Hiroshi ; Usui, Ryuichi ; Yamamoto, Takayuki ; Yamaoka, Kazutaka ; Yoshida, Atsumasa
É parte de: Publications of the Astronomical Society of Japan, 2016-10, Vol.68 (5)
Descrição: Abstract Twenty-three giant flares from thirteen active stars (eight RS CVn systems, one Algol system, three dMe stars, and one young stellar object) were detected during the first two years of our all-sky X-ray monitoring with the gas propotional counters (GSC) of the Monitor of All-sky X-ray Image (MAXI). The observed parameters of all these MAXI/GSC flares are found to be at the upper ends for stellar flares with the luminosity of 1031–34 erg s−1 in the 2–20 keV band, the emission measure of 1054–57 cm−3, the e-folding time of 1 hr to 1.5 d, and the total radiative energy released during the flare of 1034–39 erg. Notably, the peak X-ray luminosity of $5^{+4}_{-2} \times 10^{33}\:$ erg s−1 in the 2–20 keV band was detected in one of the flares on II Peg, which is one of the, or potentially the, largest-ever-observed in stellar flares. X-ray flares were detected from GT Mus, V841 Cen, SZ Psc, and TWA-7 for the first time in this survey. Whereas most of our detected sources are multiple-star systems, two of them are single stars (YZ CMi and TWA-7). Among the stellar sources within 100 pc distance, the MAXI/GSC sources have larger rotation velocities than the other sources. This suggests that the rapid rotation velocity may play a key role in generating large flares. Combining the X-ray flare data of nearby stars and the sun, taken from literature and our own data, we discovered a universal correlation of $\tau \propto L_{\rm X}^{0.2}$ for the flare duration τ and the intrinsic X-ray luminosity L X in the 0.1–100 keV band, which holds for 5 and 12 orders of magnitude in τ and L X, respectively. The MAXI/GSC sample is located at the highest ends of the correlation.
Editor: Oxford University Press
Idioma: Inglês

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Large X-ray flares on stars detected with MAXI/GSC: A universal correlation between the duration of a flare and its X-ray luminosity

Oxford University Press

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