Fast outflows in compact radio sources: evidence for AGN-induced feedback in the early stages of radio source evolution
By J. Holt, C. Tadhunter, R. Morganti, U. Sheffield, N. F. F. R. Astronomy. 2008
190 citations recorded by the source corpus.
We present intermediate-resolution, wide-wavelength coverage spectra for a complete sample of 14 compact radio sources taken with the aim of investigating the impact of the nuclear activity on the circumnuclear interstellar medium (ISM) in the early stages of radio source evolution. We observe spatially extended line emission (up to ∼20 kpc) in the majority of sources which is consistent with a quiescent halo. In the nuclear apertures we observe broad, highly complex emission-line profiles. Multiple Gaussian modelling of the [O III]λ5007 line reveals between two and four components which can have velocity widths [full width at halfmaximum (FWHM)] and blueshifts relative to the halo of up to ∼2000 km s −1 . We interpret these broad, blueshifted components as material in outflow and discuss the kinematical evidence for jet-driven outflows as previously proposed for PKS 1549−79 and PKS 1345+12. Comparisons with samples in the literature show that compact radio sources harbour more extreme nuclear kinematics than their extended counterparts, a trend seen within our sample with larger velocities in the smaller sources. The observed velocities are also likely to be influenced by source orientation with respect to the observer’s line of sight. Nine sources have associated H I absorption. In common with the optical emission-line gas, the H I profiles are often highly complex with the majority of the detected components significantly blueshifted, tracing outflows in the neutral gas. The sample has been tested for stratification in the ISM (FWHM/ionization potential/critical density) as suggested by Holt, Tadhunter & Morganti for PKS 1345+12 but we find no significant trends within the sample using a Spearman rank analysis. This study supports the idea that compact radio sources are young radio-loud active galactic nuclei observed during the early stages of their evolution and currently shedding their natal cocoons through extreme circumnuclear outflows.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/4943aac9e6611c2187d1c8f5e2e520427477bc85
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
Citations in the corpus
- DRIVING OUTFLOWS WITH RELATIVISTIC JETS AND THE DEPENDENCE OF ACTIVE GALACTIC NUCLEUS FEEDBACK EFFICIENCY ON INTERSTELLAR MEDIUM INHOMOGENEITY (2012, methodology): “Holt et al. (2008) studied the optical emission line gas kinematics in 14 compact radio sources and found strong evidence for fast outflows in 11 cases.”
- Black Hole Outflows (2009, background): “Some of these outflows are seen in compact radio sources (e.g. Holt et al. 2008), some in Seyfert galaxies which are clearly sub-Eddington and others in post-starburst galaxies (cf. Tremonti C© 2009 The Author.”
- Narrow-line region gas kinematics of 24 264 optically selected AGN: the radio connection (2013, background): “…fraction of optically selected AGNs overall, they are at least ∼10 times more common than the more radio luminous AGNs that are typically the focus of detailed studies of AGN outflows (e.g. Holt et al. 2003, 2008; Tadhunter et al. 2003; Nesvadba et al. 2006, 2008; Cano-Dı́az et al. 2012; see fig.”
- Kiloparsec-scale outflows are prevalent among luminous AGN: outflows and feedback in the context of the overall AGN population (2014, background): “…identified disturbed and high-velocity ionised gas over kiloparsec scales (e.g., McCarthy et al. 1996; Villar-Martı́n et al. 1999; Colina et al. 1999; Holt et al. 2008; Nesvadba et al. 2007, 2008; Lipari et al. 2009a,b; Fu & Stockton 2009; Alexander et al. 2010; Humphrey et al. 2010; Greene et al.…”
- INTEGRAL FIELD SPECTROSCOPY OF MASSIVE, KILOPARSEC-SCALE OUTFLOWS IN THE INFRARED-LUMINOUS QSO Mrk 231 (2011, background): “On the scales of galaxies, radio jets power neutral and ionized outflows with significant mass and energy flux (Morganti et al. 2005, 2007; Holt et al. 2008; Fu & Stockton 2009; Holt et al. 2011).”
- Energetic galaxy-wide outflows in high-redshift ultraluminous infrared galaxies hosting AGN activity (2012, background): “Such observations of low-redshift galaxies have identified kpc-scale outflows in both ionised (e.g., Holt et al. 2008; Fu & Stockton 2009; Rupke & Veilleux 2011; Westmoquette et al. 2012) and molecular gas (e.g., Feruglio et al. 2010; Alatalo et al. 2011).”