TY - JOUR
T1 - X-ray spectra of the Narrow-Line Seyfert 1 Galaxy Ton S180 in comparison with galactic black holes
AU - Murashima, Mio
AU - Kubota, Aya
AU - Makishima, Kazuo
AU - Kokubun, Motohide
AU - Hong, Soojing
AU - Negoro, Hitoshi
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
KW - Accretion, accretion disks
KW - Galaxies: Seyfert
KW - X-rays: individual (Ton S180)
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U2 - 10.1093/pasj/57.2.279
DO - 10.1093/pasj/57.2.279
M3 - Article
AN - SCOPUS:18944381925
VL - 57
SP - 279
EP - 285
JO - Publication of the Astronomical Society of Japan
JF - Publication of the Astronomical Society of Japan
SN - 0004-6264
IS - 2
ER -