Fast neutral outflows in powerful radio galaxies : a major source of feedback in massive galaxies

By R. Morganti, C. Tadhunter, T. T. C. F. Astronomy, K. Institute, D. Physics, Astronomy, U. Sheffield. 2005

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We report the detection of fast (similar to 1000 km s(-1)), massive outflows of neutral gas observed - using the WSRT - as 21- cm H), Hi absorption against the strong radio continuum of seven radio sources. The neutral outflows occur, in at least somes cases, at kpc distance from the nucleus, and they are most likely driven by the interactions between the expanding radio jets and the gaseous medium enshrouding the central regions. We estimate that the associated mass outflow rates are up to similar to 50 M(circle dot)yr(-1), comparable ( although at the lower end of the distribution) to the outflow, rates found for starburst- driven superwinds in Ultra Luminous IR Galaxies ( ULIRG). This suggests that massive, jet- driven outflows of neutral gas in radio- loud AGN can have as large an impact on the evolution of the host galaxies as the outflows associated with starbursts. A radio- loud phase of the AGN is likely a relatively common, albeit short, phase in the life of many ( or even all) massive ellipticals. Jet- driven neutral outflows may represent one of the main feedback mechanisms in these galaxies.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/32cc4578f4be098ac9085bfc5e22a77219284244

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Citations in the corpus

Evidence for powerful AGN winds at high redshift: dynamics of galactic outflows in radio galaxies during the “Quasar Era” (2008, background): “If this is the case, then we may significantly underestimate the frequency of AGN driven outflows, simply because they are observationally more subtle (see Morganti et al. 2005, for a more detailed discussion).”
Massive molecular outflows and evidence for AGN feedback from CO observations (2013, background): “…outflows in active galaxies, both locally (e.g. Rupke & Veilleux 2011, 2013b; Müller-Sánchez et al. 2011; Mullaney et al. 2013; Emonts et al. 2005; Morganti et al. 2003, 2005; Martin 2005; Soto et al. 2012; Rodríguez Zaurín et al. 2013) and at high redshift (e.g. Harrison et al. 2012; Cano-Díaz…”
The multi-phase winds of Markarian 231: from the hot, nuclear, ultra-fast wind to the galaxy-scale, molecular outflow (2015, background): “Radio observations have also detected many neutral atomic gas outflows with velocities up to 1500 km s−1 (Morganti et al. 2005; Teng et al. 2013).”
The fast molecular outflow in the Seyfert galaxy IC 5063 as seen by ALMA (2015, background): “Cold gas has been found to represent the dominant mass component of the outflows observed (see e.g. Morganti et al. 2005a,b, 2013a,b; Kanekar & Chengalur 2008; Holt et al. 2009; Feruglio et al. 2010; Alatalo et al. 2011; Dasyra & Combes 2011, 2012; Cicone et al. 2014; García-Burillo et al. 2014,…”