Oct 1, 2019
X-ray and optical observations of the black hole candidate MAXI J1828-249
Publications of the Astronomical Society of Japan
- Volume
- 71
- Number
- 5
- First page
- 108
- Last page
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1093/pasj/psz091
© 2019 The Author(s). Published by Oxford University Press on behalf of the Astronomical Society of Japan. We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249 performed with Suzaku and the Kanata telescope around the X-ray flux peak in the 2013 outburst. The time-averaged X-ray spectrum covering 0.6-168 keV was approximately characterized by a strong multi-color disk blackbody component with an inner disk temperature of ∼0.6 keV, and a power-law tail with a photon index of ∼2.0. We detected an additional structure at 5-10 keV, which can be modeled neither with X-ray reflection on the disk nor relativistic broadening of the disk emission. Instead, it was successfully reproduced with a Comptonization of disk photons by thermal electrons with a relatively low temperature (10 keV). We infer that the source was in the intermediate state, considering its long-term trend in the hardness intensity diagram, the strength of the spectral power-law tail, and its variability properties. The lowerature Comptonization component could be produced in a boundary region between the truncated standard disk and the hot inner flow, or a Comptonizing region that somehow developed above the disk surface. The multi-wavelength spectral energy distribution suggests that the optical and ultraviolet fluxes were dominated by irradiated outer disk emission.
- Link information
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- DOI
- https://doi.org/10.1093/pasj/psz091
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074441314&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85074441314&origin=inward
- URL
- https://academic.oup.com/pasj/article-abstract/71/5/108/5571194?redirectedFrom=fulltext
- ID information
-
- DOI : 10.1093/pasj/psz091
- ISSN : 0004-6264
- eISSN : 2053-051X
- SCOPUS ID : 85074441314