Swift J1753.5-0127: understanding the accretion geometry through frequency-resolved spectroscopy

The Black Hole Binary source Swift J175.5-0127 remained in outburst for $\sim$ 12 years from May 2005 to April 2017. For most part of the outburst, Low Hard State (LHS) displaying transitions softer states only towards end short periods time. Quasi periodic Oscillations (QPOs) were observed Power Density Spectrum (PDS) during decay. A soft thermal component was required model spectrum LHS, which does not conform generally accepted disc truncation theory. In this work, we attempt obtain a clearer picture accretion geometry by studying QPO variability using frequency resolved spectroscopy (FRS). We rms bright-hard state and it with physical components. find that can be described Comptonisation no contribution disc. This indicates PDS originates evolution QPOs is likely result localization variabilities different radii hot inner flow rather than truncation. minimal variation parameters also points existence stable throughout outburst.