X-ray and Optical Observations of the Black Hole Candidate MAXI J1828-249

Abstract

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 modelled 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 low-temperature 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 UV fluxes were dominated by irradiated outer disk emission.

18 pages, 9 figures and 3 tables, Accepted for publication in PASJ

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• Re-estimating the Spin Parameter of the Black Hole in Cygnus X-1
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• The INTEGRAL view on Black Hole X-ray Binaries
• Possible contribution of X-ray binary jets to the Galactic cosmic ray and neutrino flux
• Do stellar-mass and super-massive black holes have similar dining habits?
• A Dependable Distance Estimator to Black Hole Low-Mass X-ray Binaries
• Empirical correlation between masses of black holes and Wolf-Rayet stars derived from their mass distributions in spectroscopic binaries