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Title: Galaxy-scale ionised winds driven by ultra-fast outflows in two nearby quasars
Authors: Marasco, A.
Cresci, G.
Nardini, E.
Mannuncci, F.
Marconi, A.
Tozzi, P.
Amiri, A.
Venturi, G.
Piconcelli, E.
Lanzuisi, G.
Tombesi, F.
Mingozzi, M.
Perna, M.
Carniani, S.
Brusa, M.
Di Serego Alighieri, S.
Keywords: Quasars: individual;MR 2251-178;PG 1126−041;ISM; jets and outflows;Techniques: imaging spectroscopy;Galaxies: ISM
Issue Date: 24-Nov-2020
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202038889
Published version:
Citation: Astronomy and Astrophysics 644: A15(2020)
Abstract: We used MUSE adaptive optics data in narrow field mode to study the properties of the ionised gas in MR 2251-178 and PG 1126-041, two nearby (z similar or equal to 0.06) bright quasars (QSOs) hosting sub-pc scale ultra-fast outflows (UFOs) detected in the X-ray band. We decomposed the optical emission from diffuse gas into a low- and a high-velocity components. The former is characterised by a clean, regular velocity field and a low (similar to 80 km s(-1)) velocity dispersion. It traces regularly rotating gas in PG 1126-041, while in MR 2251-178 it is possibly associated with tidal debris from a recent merger or flyby. The other component is found to be extended up to a few kpc from the nuclei, and shows a high (similar to 800 km s(-1)) velocity dispersion and a blue-shifted mean velocity, as is expected from outflows driven by active galactic nuclei (AGN). We estimate mass outflow rates up to a few M-circle dot yr(-1) and kinetic efficiencies L-KIN/L-BOL between 1-4x10(-4), in line with those of galaxies hosting AGN of similar luminosities. The momentum rates of these ionised outflows are comparable to those measured for the UFOs at sub-pc scales, which is consistent with a momentum-driven wind propagation. Pure energy-driven winds are excluded unless about 100x additional momentum is locked in massive molecular winds. In comparing the outflow properties of our sources with those of a small sample of well-studied QSOs hosting UFOs from the literature, we find that winds seem to systematically lie either in a momentum-driven or an energy-driven regime, indicating that these two theoretical models bracket the physics of AGN-driven winds very well.
Description: The reduced datacubes are only available at the CDS via anonymous ftp to ( or via
E-ISSN: 1432-0746
ISSN: 0004-6361
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