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Spectral Evolution of a New X-Ray Transient MAXI J0556−332 Observed by MAXI, Swift, and RXTE

Sugizaki, Mutsumi ; Yamaoka, Kazutaka ; Matsuoka, Masaru ; Kennea, Jamie A ; Mihara, Tatehiro ; Hiroi, Kazuo ; Ishikawa, Masaki ; Isobe, Naoki ; Kawai, Nobuyuki ; Kimura, Masashi ; Kitayama, Hiroki ; Kohama, Mitsuhiro ; Matsumura, Takanori ; Morii, Mikio ; Nakagawa, Yujin E ; Nakahira, Satoshi ; Nakajima, Motoki ; Negoro, Hitoshi ; Serino, Motoko ; Shidatsu, Megumi ; Sootome, Tetsuya ; Sugimori, Kousuke ; Suwa, Fumitoshi ; Toizumi, Takahiro ; Tomida, Hiroshi ; Tsuboi, Yoko ; Tsunemi, Hiroshi ; Ueda, Yoshihiro ; Ueno, Shiro ; Usui, Ryuichi ; Yamamoto, Takayuki ; Yamauchi, Makoto ; Yamazaki, Kyohei ; Yoshida, Atsumasa

Publications of the Astronomical Society of Japan, 2013-06, Vol.65 (3) [Periódico revisado por pares]

Oxford, UK: Oxford University Press

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Título:
Spectral Evolution of a New X-Ray Transient MAXI J0556−332 Observed by MAXI, Swift, and RXTE
Autor: Sugizaki, Mutsumi ; Yamaoka, Kazutaka ; Matsuoka, Masaru ; Kennea, Jamie A ; Mihara, Tatehiro ; Hiroi, Kazuo ; Ishikawa, Masaki ; Isobe, Naoki ; Kawai, Nobuyuki ; Kimura, Masashi ; Kitayama, Hiroki ; Kohama, Mitsuhiro ; Matsumura, Takanori ; Morii, Mikio ; Nakagawa, Yujin E ; Nakahira, Satoshi ; Nakajima, Motoki ; Negoro, Hitoshi ; Serino, Motoko ; Shidatsu, Megumi ; Sootome, Tetsuya ; Sugimori, Kousuke ; Suwa, Fumitoshi ; Toizumi, Takahiro ; Tomida, Hiroshi ; Tsuboi, Yoko ; Tsunemi, Hiroshi ; Ueda, Yoshihiro ; Ueno, Shiro ; Usui, Ryuichi ; Yamamoto, Takayuki ; Yamauchi, Makoto ; Yamazaki, Kyohei ; Yoshida, Atsumasa
É parte de: Publications of the Astronomical Society of Japan, 2013-06, Vol.65 (3)
Descrição: We report on the spectral evolution of a new X-ray transient, MAXI J0556 $-$ 332, observed by MAXI, Swift, and RXTE. The source was discovered on 2011 January 11 (MJD $ =$ 55572) by the MAXI Gas Slit Camera all-sky survey at ( $ l$ , $ b$ ) $ =$ (238. $ ^{\!\!\!\circ}$ 9, $-$ 25. $ ^{\!\!\!\circ}$ 2), relatively away from the Galactic plane. Swift/XRT follow-up observations identified it with a previously uncatalogued bright X-ray source, which led to optical identification. For more than one year since its appearance, MAXI J0556 $-$ 332 has been X-ray active, with a 2–10 keV intensity above 30 mCrab. The MAXI/GSC data revealed rapid X-ray brightening in the first five days, and a hard-to-soft transition in the meantime. For the following $ \sim$ 70 days, the 0.5–30 keV spectra, obtained by the Swift/XRT and the RXTE/PCA on an almost daily basis, show a gradual hardening, with large flux variability. These spectra are approximated by a cutoff power-law with a photon index of 0.4–1 and a high-energy exponential cutoff at 1.5–5 keV, throughout the initial 10 months where the spectral evolution is mainly represented by a change of the cutoff energy. To be more physical, the spectra are consistently explained by thermal emission from an accretion disk plus Comptonized emission from a boundary layer around a neutron star. This supports the source identification as being a neutron-star X-ray binary. The obtained spectral parameters agree with those of neutron-star X-ray binaries in the soft state, whose luminosity is higher than 1.8 $ \times$ 10 $ ^{37}$ erg s $ ^{-1}$ . This suggests a source distance of $ >$ 17 kpc.
Editor: Oxford, UK: Oxford University Press
Idioma: Inglês

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Spectral Evolution of a New X-Ray Transient MAXI J0556−332 Observed by MAXI, Swift, and RXTE

Oxford, UK: Oxford University Press

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