Quasar outflows and AGN feedback in the extreme UV: HST/COS observations of HE 0238−1904
By N. Arav, B. Borguet, C. Chamberlain, D. Edmonds, C. Danforth. 2013
149 citations recorded by the source corpus.
Spectroscopic observations of quasar outflows at rest-frame 500-1000 Angstrom have immense diagnostic power. We present analyses of such data, where absorption troughs from three important ions are measured: first, O IV and O IV* that allow us to obtain the distance of high ionization outflows from the AGN; second, Ne VIII and Mg X that are sensitive to the very high ionization phase of the outflow. Their inferred column densities, combined with those of troughs from O VI, N IV, and H I, yield two important results: 1) The outflow shows two ionization phases, where the high ionization phase carries the bulk of the material. This is similar to the situation seen in x-ray warm absorber studies. Furthermore, the low ionization phase is inferred to have a volume filling factor of 10^(-5)-10^(-6). 2) From the O IV to O IV* column density ratio, and the knowledge of the ionization parameter, we determine a distance of 3000 pc. from the outflow to the central source. Since this is a typical high ionization outflow, we can determine robust values for the mass flux and kinetic luminosity of the outflow: 40 solar masses per year and 10^45 ergs/s, respectively, where the latter is roughly equal to 1% of the bolometric luminosity. Such a large kinetic luminosity and mass flow rate measured in a typical high ionization wind suggests that quasar outflows are a major contributor to AGN feedback mechanisms.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/c77737d44d18ce2f8185a0281f8cbaa2b582f280
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Citations in the corpus
- X-shooter reveals powerful outflows in z ∼ 1.5 X-ray selected obscured quasi-stellar objects (2014, background): “Extensive works in the past years uniquely contributed to our understanding of the winds physics, in terms of spatial location, ionization level and energetics involved (see, e.g., Moe et al. 2009; Borguet et al. 2013 and Arav et al. 2013).”
- Cool outflows in galaxies and their implications (2020, background): “…more recently been extended to the broad absorption lines from more highly ionized species (e.g., Si IV∗) in the more common High-ionization Broad Absorption line (HiBAL) QSOs (e.g. Arav et al. 2013, 2018; Miller et al. 2018; Xu et al. 2018), and for all BAL QSOs in general (Hamann et al. 2019).”
- EVIDENCE FOR WIDE-SPREAD ACTIVE GALACTIC NUCLEUS-DRIVEN OUTFLOWS IN THE MOST MASSIVE z ∼ 1–2 STAR-FORMING GALAXIES (2014, background): “At high-z, AGN feedback has been observed in the so-called quasar mode in broad absorption line quasars (Arav et al. 2001, 2008, 2013; Korista et al. 2008), in type 2 AGNs (Alexander et al. 2010; Nesvadba et al. 2011; Cano Dı́az et al. 2012; Harrison et al. 2012), and in radio galaxies (Nesvadba et…”
- Quasar feedback and the origin of radio emission in radio-quiet quasars (2014, background): “…active galaxies, where the radiativelydriven wind would get quenched by the interaction with the interstellar medium, but could be typical of quasardriven winds (Moe et al. 2009; Zubovas & King 2012; Faucher-Giguère & Quataert 2012) even on galaxy-wide scales (Arav et al. 2013; Liu et al. 2013b).”
- Theoretical Challenges in Galaxy Formation (2016, background): “In addition to relativistic jets there are also broad-line winds observed to be commonly emitted by AGN (Yuan & Narayan 2014) and these too have been calibrated to the accretion rate empirically (Arav et al. (2013), see also Krolik 1999).”