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|Title:||Blowin' in the Wind: Both "Negative" and "Positive" Feedback in an Obscured High-z Quasar||Authors:||CRESCI, GIOVANNI
Silverman, J. D.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||799||Issue:||1||First Page:||82||Abstract:||Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation in galaxies, preventing massive galaxies to overgrow and producing the red colors of ellipticals. On the other hand, some models are also requiring "positive" active galactic nucleus feedback, inducing star formation in the host galaxy through enhanced gas pressure in the interstellar medium. However, finding observational evidence of the effects of both types of feedback is still one of the main challenges of extragalactic astronomy, as few observations of energetic and extended radiatively driven winds are available. Here we present SINFONI near infrared integral field spectroscopy of XID2028, an obscured, radio-quiet z = 1.59 QSO detected in the XMM-COSMOS survey, in which we clearly resolve a fast (1500 km s<SUP>-1</SUP>) and extended (up to 13 kpc from the black hole) outflow in the [O III] lines emitting gas, whose large velocity and outflow rate are not sustainable by star formation only. The narrow component of Hα emission and the rest frame U-band flux from Hubble Space Telescope/Advanced Camera for Surveys imaging enable to map the current star formation in the host galaxy: both tracers independently show that the outflow position lies in the center of an empty cavity surrounded by star forming regions on its edge. The outflow is therefore removing the gas from the host galaxy ("negative feedback"), but also triggering star formation by outflow induced pressure at the edges ("positive feedback"). XID2028 represents the first example of a host galaxy showing both types of feedback simultaneously at work.||Acknowledgments:||We are grateful to the ESO staff for their work and support. We also acknowledge the contribution of the entire COSMOS collaboration for making their data products publicly available. G.C. and A.M. acknowledge support from grant PRIN-INAF 2011 “Black hole growth and AGN feedback through the cosmic time” and from grant PRIN-MIUR 2010-2011 “The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid.” M.B. and M.P. acknowledge support FP7 Career Integration Grant “Supermassive Black Holes evolution through cosmic time: from current surveys to eROSITA-Euclid AGN synergies” (eEASy, CIG 321913). Facilities: VLT (SINFONI) , HST (ACS)||URI:||http://hdl.handle.net/20.500.12386/23829||URL:||http://adsabs.harvard.edu/abs/2015ApJ...799...82C
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 26, 2020
checked on Sep 26, 2020
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