The evolving properties of the corona of GRS 1915+105: a spectral-timing perspective through variable-Comptonization modelling

• DOI: 10.1093/mnras/stac1202
• Publication Date: 2022-05-11T03:39:33Z
• Authors: Federico García; Konstantinos Karp...; Mariano Méndez; Liang Zhang; Yuexin Zhang; Tomaso Belloni; Diego Altamirano
• Keywords: Corona (planetary geology)

ABSTRACT The inverse Compton process by which soft photons are up-scattered hot electrons in a corona plays fundamental role shaping the X-ray spectra of black hole (BH) low-mass binaries (LMXBs), particularly hard and hard-intermediate states. In these states, power-density sources typically show Type-C low-frequency quasi-periodic oscillations (QPOs). Although several models have been proposed to explain dynamical origin their frequency, only few those predict spectral-timing radiative properties QPOs. Here, we study physical geometrical BH-LMXB GRS 1915+105 based on large sample observations available RXTE archive. We use recently developed Comptonization model fit simultaneously energy-dependent fractional rms amplitude phase-lag QPO 398 observations. For this, include spectral information gathered from fitting corresponding time-averaged spectra. analyse dependence upon frequency state source, latter characterized hardness ratio. find consistent trends evolution size, temperature, feedback (the fraction that impinge back disc) persist for roughly 15 yr. By correlating our with simultaneous radio-monitoring source at GHz, propose scenario disc–corona interactions connect launching mechanism radio jet this source.