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

R. Miyawaki; M. Sogiho; A. Kubota; K. Makishima; M. Namiki; T. Tanaka; N. Tsunoda

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

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 language	English
Title of host publication	X-ray Universe 2005
Pages	433-438
Number of pages	6
Edition	604
Publication status	Published - 2006
Externally published	Yes
Event	X-ray Universe 2005 - Madrid, Spain Duration: 2005 Sept 26 → 2005 Sept 30

Publication series

Name	European Space Agency, (Special Publication) ESA SP
Number	604
Volume	1
ISSN (Print)	0379-6566

Conference

Conference	X-ray Universe 2005
Country/Territory	Spain
City	Madrid
Period	05/9/26 → 05/9/30

Keywords

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

ASJC Scopus subject areas

Aerospace Engineering
Space and Planetary Science

Cite this

@inproceedings{5c214df2e6b24327899c57bf2ae7a2d7,

title = "Spectral study of ultra-luminous compact X-ray sources with XMM-NEWTON and CHANDRA",

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).",

keywords = "Galaxies: individual (M 81 / NGC 1313), X-rays: galaxies",

author = "R. Miyawaki and M. Sogiho and A. Kubota and K. Makishima and M. Namiki and T. Tanaka and N. Tsunoda",

year = "2006",

language = "English",

isbn = "9290929154",

series = "European Space Agency, (Special Publication) ESA SP",

number = "604",

pages = "433--438",

booktitle = "X-ray Universe 2005",

edition = "604",

note = "X-ray Universe 2005 ; Conference date: 26-09-2005 Through 30-09-2005",

}

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

UR - http://www.scopus.com/inward/record.url?scp=33645522124&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645522124&partnerID=8YFLogxK

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 -

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

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this