IISER MOHALI

Abstract: X-ray binaries, the most luminous objects, harbor the universe'sfascinating objects: neutron stars and black holes that accrete from abinary companion star. Fast X-ray timing and spectral observations areexcellent diagnostic tools that enable us to probe regions of stronggravity, dense matter, and strong magnetic fields and explorestationary space-time metrics inaccessible to gravitational-wavedetectors. In this talk, I will discuss discoveries of coherent andincoherent signals in the light curves from high-time resolutionobservatories. Presenting results from the AstroSat survey, I willdiscuss the discovery of an intermittent accretion-powered millisecondX-ray pulsar (AMXP), a significant addition to a small set of 25 knownAMXPs, and potential gravitational wave sources. Shifting the focus tothe power of the multiwavelength probe of accreting systems, I willpresent findings from dense multi-wavelength campaigns on the neutronstar and black hole systems and build on these discoveries to create acomprehensive picture that can be used to understand systems seen atdifferent mass accretion rates. Finally, I will conclude byemphasizing the potential of X-ray polarization measurements combinedwith X-ray timing-spectral and multi-band observations.\n