Accretion Flow Properties of MAXI J1543-564 During 2011 Outburst from TCAF Solution

TL;DR

This study analyzes the accretion flow properties of the black hole candidate MAXI J1543-564 during its 2011 outburst using TCAF model fitting, revealing spectral state transitions, QPO evolution, and estimating the black hole's mass.

Contribution

It applies the TCAF solution to RXTE data to derive physical accretion parameters and models QPO evolution, providing new insights into the outburst dynamics and black hole mass estimation.

Findings

Identified hard-intermediate and soft-intermediate spectral states.

Matched QPO frequencies with shock parameters from TCAF and POS models.

Estimated black hole mass to be approximately 13 solar masses.

Abstract

We derive accretion flow properties of the transient black hole candidate (BHC) MAXI~J1543-564 using the RXTE data. We use Two-Component Advective Flow (TCAF) solution to fit the data of the very initial rising phase of outburst (from 2011 May 10 to 2011 May 15). $2.5-25$~keV spectra are fitted using the TCAF solution {\it fits} file as a local additive table model in XSPEC. We extract physical flow parameters such as the two component (Keplerian disk and sub-Keplerian halo) accretion rates and size and the property of the Compton cloud (post shock region close to a black hole). Similar to other classical transient BHCs, monotonic evolution of low frequency quasi-periodic oscillations (QPOs) are observed during the rising phase of the outburst, which is fitted with the propagating oscillatory shock (POS) model which describes how the Compton cloud properties change from day to day. From the nature of variations of TCAF model fitted physical flow parameters and QPOs, we only found hard-intermediate and soft-intermediate spectral states during this phase of the outburst under study. We also calculate frequency of the dominating QPOs from the TCAF model fitted shock parameters, and found that they roughly match with the observed and POS model fitted values. From our spectro-temporal study of the source with TCAF and POS models, the most probable mass of the BHC is found to be $12.6-14.0$~$M_\odot$, or $13^{+1.0}_{-0.4}~M_\odot$.