X-ray and optical observations of a compact black hole binary MAXI J1910-057: implication for the companion and evidence for the jet turn-on
Abstract
We present the X-ray and optical observations of a black hole candidate MAXI J1910-057, which was discovered by MAXI as an X-ray nova in May 2012.Its optical counterpart was subsequently detected by Swift.We conducted monitoring observation with the 50 cm MITSuME telescope in three colors g', R, I.The spectral shape of the optical emission, as well as the good correlation between the X-ray and optical fluxes during the decay of the outburst indicate that the optical lights are reprocessed X rays. Furthermore, assuming the 2.2 hours period, which was detected using the Murikabushi 1-meter telescope, is the binary orbital period, we can constrain the mass and the radius of the companion. We continued optical monitoring even after the X-ray flux fell below the detection limit of MAXI. To our surprise, the optical emission was still present, though it had completely different spectral slope and strong variability that was not seen during the X-ray outburst. We consider that this variable non-thermal optical emission is produced by the jet which was turned on as the accretion rate dropped.
- Publication:
-
IAU General Assembly
- Pub Date:
- August 2015
- Bibcode:
- 2015IAUGA..2257355Y