X-ray spectra of the Narrow-Line Seyfert 1 Galaxy Ton S180 in comparison with galactic black holes

Mio Murashima, Aya Kubota, Kazuo Makishima, Motohide Kokubun, Soojing Hong, Hitoshi Negoro

研究成果: Article査読

5 被引用数 (Scopus)

抄録

An analysis was made of 0.3-15 keV X-ray spectra of a Narrow-Line Seyfert 1 Galaxy, Ton S180, using archival data from ASCA, RXTE, and XMM-Newton. At energies above 2.5 keV, a power-law with a photon index of ∼ 2.3 successfully and consistently reproduced the spectra from all of these observatories. Assuming this powerlaw component to extend toward lower energies, a soft excess, which is one of the most remarkable features of Narrow-Line Seyfert 1 Galaxies, is explained by another power-law multiplied by a thermal cutoff at ∼ 0.4 keV. Some similarities have been observed between this object and Galactic black hole binaries in very high state, the latter being realized under high accretion rates. Attempts have been made to interpret the soft excess in terms of Comptonization of the disk photons by an electron cloud surrounding the accretion disk, like BHBs in a very high state.

本文言語English
ページ(範囲)279-285
ページ数7
ジャーナルPublications of the Astronomical Society of Japan
57
2
DOI
出版ステータスPublished - 2005
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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