# The 2004 Outburst of BHC H1743-322: Analysis of spectral and timing properties using the TCAF Solution

## TL;DR

This study analyzes the 2004 outburst of black hole H1743-322 using the TCAF model to understand accretion dynamics, spectral and timing properties, and estimates the black hole's mass.

## Contribution

It applies the TCAF solution to RXTE data to derive detailed accretion flow parameters and constrain the black hole mass during the outburst.

## Key findings

- Derived accretion rates of Keplerian and sub-Keplerian flows over time.
- Estimated black hole mass range of 10.31 to 14.07 solar masses.
- Constrained spectral and timing properties consistent with previous estimates.

## Abstract

The black hole transient H1743-322 exhibited several outbursts with temporal and spectral variability since its discovery in 1977. These outbursts occur at a quasi-regular recurrence period of around $0.5-2$ years, since its rediscovery in March 2003. We investigate accretion flow dynamics around the Low Mass X-ray Binary H1743-322 during its 2004 outburst using the RXTE/PCA archival data. We use Two Component Advective Flow (TCAF) solution to analyse the spectral data. From the fits with TCAF solution, we obtain day to day variation of physical accretion rates of Keplerian and sub-Keplerian components, size of the Compton cloud and its other properties. Analysis of the spectral properties of the 2004 outburst by keeping fitted normalization to be in a narrow range and its timing properties in terms of the presence and absence of QPOs, enable us to constrain the mass of the black hole in a range of $10.31 M_{\odot} - 14.07 M_{\odot}$ which is consistent with other estimates reported in the literature.