Journal article
SWIFT OBSERVATIONS OF THE ULTRALUMINOUS X-RAY SOURCE HOLMBERG IX X-1
The Astrophysical journal, Vol.722(2), pp.1816-1820
10/20/2010
DOI: 10.1088/0004-637X/722/2/1816
Abstract
Holmberg IX X-1 is a well-known ultraluminous X-ray source with an X-ray luminosity of {approx}10{sup 40} erg s{sup -1}. The source has been monitored by the X-ray telescope of Swift regularly. Since 2009 April, the source has been in an extended low luminosity state. We utilize the co-added spectra taken at different luminosity states to study the spectral behavior of the source. Simple power-law and multi-color disk blackbody models can be ruled out. The best overall fits, however, are provided by a dual thermal model with a cool blackbody and a warm disk blackbody. This suggests that Holmberg IX X-1 may be a 10 M{sub sun} black hole accreting at seven times above the Eddington limit or a 100 M{sub sun} maximally rotating black hole accreting at the Eddington limit, and we are observing both the inner regions of the accretion disk and outflows from the compact object.
Details
- Title: Subtitle
- SWIFT OBSERVATIONS OF THE ULTRALUMINOUS X-RAY SOURCE HOLMBERG IX X-1
- Creators
- A. K. H Kong - National Tsing Hua UniversityT.-C Yen - National Tsing Hua UniversityY. J Yang - University of AmsterdamH Feng - Tsinghua UniversityP Kaaret - University of Iowa
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.722(2), pp.1816-1820
- DOI
- 10.1088/0004-637X/722/2/1816
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 10/20/2010
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199727502771
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