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We report on the discovery of a UV absorption counterpart of a low-ionizationX-ray ultra-fast outflow (UFO) in the Narrow-Line Seyfert-1 galaxy IRAS17020+4544. This UV signature of the UFO is seen as a narrow and blueshiftedLyman-alpha absorption feature in the far-UV spectrum, taken with the CosmicOrigins Spectrograph (COS) on the Hubble Space Telescope (HST). The Lyman-alphafeature is found to be outflowing with a velocity of -23430 km/s (0.078 c). Wecarry out high-resolution UV spectroscopy and photoionization modeling to studythe UFO that is seen in the HTS/COS spectrum. The results of our modeling showthat the UV UFO corresponds to a low-ionization, low-velocity component of theX-ray UFO found previously with XMM-Newton's Reflection Grating Spectrometer(RGS). The other higher-velocity and higher-ionization components of the X-rayUFOs are not significantly detected in the HST/COS spectrum, consistent withpredictions of our photoionization calculations. The multiple ionization andvelocity components of the UFOs in IRAS 17020+4544 suggest a scenario where apowerful primary UFO entrains and shocks the ambient medium, resulting information of weaker secondary UFO components, such as the one found in the UVband.

UV counterpart of an X-ray ultra-fast outflow in IRAS 17020+4544