Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA

R. Miyawaki, M. Sogiho, Aya Kubota, K. Makishima, M. Namiki, T. Tanaka, N. Tsunoda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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).

Original languageEnglish
Title of host publicationEuropean Space Agency, (Special Publication) ESA SP
Pages433-438
Number of pages6
Volume1
Edition604
Publication statusPublished - 2006
Externally publishedYes
EventX-ray Universe 2005 - Madrid
Duration: 2005 Sep 262005 Sep 30

Other

OtherX-ray Universe 2005
CityMadrid
Period05/9/2605/9/30

Fingerprint

Luminance
X rays
Color

Keywords

  • Galaxies: individual (M 81 / NGC 1313)
  • X-rays: galaxies

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Miyawaki, R., Sogiho, M., Kubota, A., Makishima, K., Namiki, M., Tanaka, T., & Tsunoda, N. (2006). Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA. In European Space Agency, (Special Publication) ESA SP (604 ed., Vol. 1, pp. 433-438)

Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA. / Miyawaki, R.; Sogiho, M.; Kubota, Aya; Makishima, K.; Namiki, M.; Tanaka, T.; Tsunoda, N.

European Space Agency, (Special Publication) ESA SP. Vol. 1 604. ed. 2006. p. 433-438.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Miyawaki, R, Sogiho, M, Kubota, A, Makishima, K, Namiki, M, Tanaka, T & Tsunoda, N 2006, Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA. in European Space Agency, (Special Publication) ESA SP. 604 edn, vol. 1, pp. 433-438, X-ray Universe 2005, Madrid, 05/9/26.
Miyawaki R, Sogiho M, Kubota A, Makishima K, Namiki M, Tanaka T et al. Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA. In European Space Agency, (Special Publication) ESA SP. 604 ed. Vol. 1. 2006. p. 433-438
Miyawaki, R. ; Sogiho, M. ; Kubota, Aya ; Makishima, K. ; Namiki, M. ; Tanaka, T. ; Tsunoda, N. / Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA. European Space Agency, (Special Publication) ESA SP. Vol. 1 604. ed. 2006. pp. 433-438
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AU - Miyawaki, R.

AU - Sogiho, M.

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AU - Makishima, K.

AU - Namiki, M.

AU - Tanaka, T.

AU - Tsunoda, N.

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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).

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