The fast molecular outflow in the Seyfert galaxy IC 5063 as seen by ALMA

By R. Morganti, T. Oosterloo, J. Oonk, W. Frieswijk, C. Tadhunter. 2015

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We use high-resolution (0.5 arcsec) CO(2−1) observations performed with the Atacama Large Millimetre/submillimetre Array to trace the kinematics of the molecular gas in the Seyfert 2 galaxy IC 5063. The data reveal that the kinematics of the gas is very complex. A fast outflow of molecular gas extends along the entire radio jet (∼1 kpc), with the highest outflow velocities about 0.5 kpc from the nucleus, at the location of the brighter hot spot in the western lobe. The ALMA data show that a massive, fast outflow with velocities up to 650 km s −1 of cold molecular gas is present, in addition to the outflow detected earlier in warm H2 ,H i and ionized gas. All phases of the gas outflow show similar kinematics. IC 5063 appears to be one of the best examples of the multi-phase nature of AGN-driven outflows. Both the central AGN and the radio jet could energetically drive the outflow, however, the characteristics of the outflowing gas point to the radio jet being the main driver. This is an important result because IC 5063, although one of the most powerful Seyfert galaxies, is a relatively weak radio source (P1.4 GHz = 3 × 10 23 WH z −1 ). All the observed characteristics can be described by a scenario of a radio plasma jet expanding into a clumpy medium, interacting directly with the clouds and inflating a cocoon that drives a lateral outflow into the interstellar medium. This model is consistent with results obtained by recent simulations. A stronger, direct interaction between the jet and a gas cloud is present at the location of the brighter western lobe. This interaction may also be responsible for the asymmetry in the radio brightness of the two lobes. Even assuming the most conservative values for the conversion factor CO-to-H2, we find that the mass of the outflowing gas is between 1. 9a nd 4.8 × 10 7 M� , of which between 0.5

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/268c3ac3ffd2df8b67b0b9c7b86730c622f411e3

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Citations in the corpus

Relativistic jet feedback in high-redshift galaxies – I. Dynamics (2016, methodology): “…galactic scale, as supported by several observational evidences of jet-ISM interaction (a few recent works being Nesvadba et al. 2007, 2008, 2011; Morganti et al. 2013, 2015; Dasyra et al. 2014, 2015; Ogle, Lanz & Appleton 2014; Tadhunter et al. 2014; Lanz et al. 2015b; Collet et al. 2016;…”
Relativistic jet feedback – III. Feedback on gas discs (2018, background): “Such features have been observed in detail for the galaxy IC 5063 Morganti et al. (2015); Dasyra et al. (2015, 2016); Oosterloo et al. (2017).”