Accretion flow dynamics during 1999 outburst of XTE J1859+226—modeling of broadband spectra and constraining the source mass
Abstract
We examine the dynamical behavior of accretion flow around XTE J1859+226 during the 1999 outburst by analyzing the entire outburst data (∼166 days) from RXTE Satellite. Towards this, we study the hysteresis behavior in the hardness intensity diagram (HID) based on the broadband (3-150 keV) spectral modeling, spectral signature of jet ejection and the evolution of Quasi-periodic Oscillation (QPO) frequencies using the two-component advective flow model around a black hole. We compute the flow parameters, namely Keplerian accretion rate (\dot{m}d), sub-Keplerian accretion rate (\dot{m}h), shock location (rs) and black hole mass (M_{bh}) from the spectral modeling and study their evolution along the q-diagram. Subsequently, the kinetic jet power is computed as L^{obs}_{jet} ∼3-6 ×10^{37} erg s^{-1} during one of the observed radio flares which indicates that jet power corresponds to 8-16% mass outflow rate from the disc. This estimate of mass outflow rate is in close agreement with the change in total accretion rate (∼14%) required for spectral modeling before and during the flare. Finally, we provide a mass estimate of the source XTE J1859+226 based on the spectral modeling that lies in the range of 5.2-7.9 M_{⊙} with 90% confidence.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- May 2018
- DOI:
- 10.1007/s10509-018-3314-1
- arXiv:
- arXiv:1803.08638
- Bibcode:
- 2018Ap&SS.363...90N
- Keywords:
-
- Accretion;
- Accretion discs;
- Black hole physics;
- Radiation mechanisms: non thermal;
- X rays: binaries;
- ISM: jets and outflows;
- Stars: black holes;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 12 pages, 8 figures, 3 tables, Accepted for publication in Astrophysics and Space Science