TY - GEN
T1 - Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA
AU - Miyawaki, R.
AU - Sogiho, M.
AU - Kubota, A.
AU - Makishima, K.
AU - Namiki, M.
AU - Tanaka, T.
AU - Tsunoda, N.
PY - 2006
Y1 - 2006
N2 - Using the ASCA, XMM-Newton, and Chandra data, luminosity-dependent spectral changes of the ultra-luminous X-ray source (ULX) M 81 X-9 were studied. When the luminosity was below a threshold of ∼1.5×1040 erg s-1, the source consistently exhibited power-law spectra. In contrast, the spectra at higher luminosities were more convex, favoring a multi-color-disk modeling. A p-free disk model with p ∼ 0.6 gave a still better fit to the high-luminosity spectra of M81 X-9, suggesting the presence of a slim disk. Another ULX, NGC 1313 Source B, also showed a similar luminosity-dependent spectral change. These results agree with the ASCA report on the two ULXs in IC 342 (Kubota et al., 2001).
AB - Using the ASCA, XMM-Newton, and Chandra data, luminosity-dependent spectral changes of the ultra-luminous X-ray source (ULX) M 81 X-9 were studied. When the luminosity was below a threshold of ∼1.5×1040 erg s-1, the source consistently exhibited power-law spectra. In contrast, the spectra at higher luminosities were more convex, favoring a multi-color-disk modeling. A p-free disk model with p ∼ 0.6 gave a still better fit to the high-luminosity spectra of M81 X-9, suggesting the presence of a slim disk. Another ULX, NGC 1313 Source B, also showed a similar luminosity-dependent spectral change. These results agree with the ASCA report on the two ULXs in IC 342 (Kubota et al., 2001).
KW - Galaxies: individual (M 81 / NGC 1313)
KW - X-rays: galaxies
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M3 - Conference contribution
AN - SCOPUS:33645522124
SN - 9290929154
SN - 9789290929154
T3 - European Space Agency, (Special Publication) ESA SP
SP - 433
EP - 438
BT - X-ray Universe 2005
T2 - X-ray Universe 2005
Y2 - 26 September 2005 through 30 September 2005
ER -