| Abstract : | AstroSat has produced significant scientific results on various cosmic sources, primarily using observations with individual instruments or in a single waveband, either ultra-violet or X-rays. AstroSat's unique capability of simultaneous near UV to hard X-ray multi-wavelength observations has found limited usage primarily due to different observing constraints and sensitivities of the four co-aligned instruments. AstroSat, however, has observed several multi-wavelength bright, compact objects such as Active Galactic Nuclei (AGNs), X-ray binaries, CVs, etc. Achieving multi-wavelength capability of AstroSat has required careful spectral/timing calibration and cross-calibration. This talk will discuss results obtained from some of the multi-wavelength AstroSat observations of AGNs, including UV/X-ray broadband spectroscopy and timing studies that have revealed the connection between accretion disk and corona, truncated accretion disks, and rare spectral transition in AGNs. |
