Journal
ASTRONOMY & ASTROPHYSICS
Volume 574, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201425035
Keywords
Galaxy: evolution; quasars: individual: XID2028; galaxies: active; quasars: emission lines
Categories
Funding
- European Southern Observatory, Paranal, Chile (ESO) [090-A-0830(A)]
- ESA Member States
- USA (NASA)
- FP7 Career Integration Grant eEASy (SMBH evolution through cosmic time: from current surveys to eROSITA-EUCLID AGN Synergies) [CIG 321913]
- DFG cluster of excellence Origin and Structure of the Universe
- Italian ministry for school, university and research (MIUR) through PRIN-MUIR
- STFC [ST/M001172/1, ST/K003119/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K003119/1, ST/M001172/1] Funding Source: researchfish
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Aims. The co-evolution of galaxies and supermassive black holes (SMBHs) requires that some sort of feedback mechanism is operating during the active galactic nuclei (AGN) phases. AGN driven winds are the most likely candidates for such feedback mechanism, but direct observational evidence of their existence and of their effects on the host galaxies are still scarce and their physical origin is still hotly debated. Methods. X-Shooter observations of a sample of X-ray selected, obscured quasars at z similar to 1.5, selected on the basis of their observed red colors and X-ray-to-optical flux ratio, have shown the presence of outflowing ionized gas identified by broad [OIII] emission lines in 6 out of 8 objects, confirming the efficiency of the selection criteria. Here we present slit-resolved spectroscopy for the two brightest sources, XID2028 and XID5321, to study the complex emission and absorption line kinematics. Results. We detect outflow extended out to similar to 10 kpc from the central black hole, both as blueshifted and redshifted emission. Interestingly, we also detect kpc scale outflows in the [OII] emission lines and in the neutral gas component, traced by the sodium D and magnesium absorption lines, confirming that a substantial amount of the outflowing mass is in the form of neutral gas. Conclusions. The measured gas velocities and the outflow kinetic powers, inferred under reasonable assumptions on the geometry and physical properties of these two systems, favor an AGN origin for the observed winds.
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