Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-05
PASJ vol. 57 (2005)
Astronomy and Astrophysics
Astrophysics
7 pages, 7 figures
Scientific paper
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 power-law 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.
Hong Soojing
Kokubun Motohide
Kubota Aya
Makishima Kazuo.
Murashima Mio M.
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