Accretion flow dynamics of maxi J1659-152 from the spectral evolution study of its 2010 outburst using the TCAF solution

Dipak Debnath, Aslam Ali Molla, Sandip K. Chakrabarti, Santanu Mondal

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Transient black hole candidates are interesting objects to study in X-rays as these sources show rapid evolutions in their spectral and temporal properties. In this paper, we study the spectral properties of the Galactic transient X-ray binary MAXI J1659-152 during its very first outburst after discovery with the archival data of RXTE Proportional Counter Array instruments. We make a detailed study of the evolution of accretion flow dynamics during its 2010 outburst through spectral analysis using the Chakrabarti-Titarchuk two-component advective flow (TCAF) model as an additive table model in XSPEC. Accretion flow parameters (Keplerian disk and sub-Keplerian halo rates, shock location, and shock strength) are extracted from our spectral fits with TCAF. We studied variations of these fit parameters during the entire outburst as it passed through three spectral classes: hard, hard-intermediate, and soft-intermediate. We compared our TCAF fitted results with standard combined disk blackbody (DBB) and power-law (PL) model fitted results and found that variations of disk rate with DBB flux and halo rate with PL flux are generally similar in nature. There appears to be an absence of the soft state, unlike what is seen in other similar sources.

Original languageEnglish
Article number59
JournalAstrophysical Journal
Issue number2
StatePublished - 20 Apr 2015
Externally publishedYes


  • X-rays: binaries
  • accretion, accretion disks
  • radiation: dynamics
  • shock waves
  • stars: black holes
  • stars: individual (MAXI J1659-152)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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