2019A&A...632A..66O


Query : 2019A&A...632A..66O

2019A&A...632A..66O - Astronomy and Astrophysics, volume 632A, 66-66 (2019/12-0)

ALMA observations of PKS 1549-79: a case of feeding and feedback in a young radio quasar.

OOSTERLOO T., MORGANTI R., TADHUNTER C., OONK J.B.R., BIGNALL H.E., TZIOUMIS T. and REYNOLDS C.

Abstract (from CDS):

We present CO(1-0) and CO(3-2) Atacama Large Millimeter/submillimeter Array observations of the molecular gas in PKS 1549-79, as well as mm and very long baseline interferometry 2.3-GHz continuum observations of its radio jet. PKS 1549-79 is one of the closest young, radio-loud quasars caught in an on-going merger in which the active galactic nucleus (AGN) is in the first phases of its evolution. We detect three structures tracing the accretion and the outflow of molecular gas: kpc-scale tails of gas accreting onto PKS 1549-79 from a merger, a circumnuclear disc in the inner few hundred parsec, and a very broad (>2300km/s) component detected in CO(1-0) at the position of the AGN. Thus, in PKS 1549-79 we see the co-existence of accretion and the ejection of gas. The line ratio CO(3-2)/CO(1-0) suggests that the gas in the circumnuclear-disc has both high densities and high kinetic temperatures. We estimate a mass outflow rate of at least 650M/yr. This massive outflow is confined to the inner region (r<120pc) of the galaxy, which suggests that the AGN drives the outflow. Considering the amount of molecular gas available in the central nuclear disc and the observed outflow rate, we estimate a time scale of ∼105yr over which the AGN would be able to destroy the circumnuclear disc, although gas from the merger may come in from larger radii, rebuilding this disc at the same time. The AGN appears to self-regulate gas accretion to the centre and onto the super-massive black hole. Surprisingly, from a comparison with Hubble Space Telescope data, we find that the ionised gas outflow is more extended. Nevertheless, the warm outflow is about two orders of magnitude less massive than the molecular outflow. PKS 1549-79 does not seem to follow the scaling relation between bolometric luminosity and the relative importance of warm ionised and molecular outflows claimed to exist for other AGN. We argue that, although PKS 1549-79 hosts a powerful quasar nucleus and an ultra-fast outflow, the radio jet plays a significant role in producing the outflow, which creates a cocoon of disturbed gas that expands into the circumnuclear disc.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: active - galaxies: individual: PKS 1549-79 - ISM: jets and outflows - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/A+A/632/A66): list.dat fits/*>

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PKS 0008-42 Rad 00 10 52.51972 -41 53 10.7911   22.0       ~ 65 1
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4236 2
3 4C 40.20 Sy2 08 12 53.1089068010 +40 18 59.895876696   21.23 20.31     ~ 58 1
4 2XMM J100211.2+013706 AGN 10 02 11.27 +01 37 06.6 24.48 24.146 24.188   22.613 ~ 55 0
5 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5466 1
6 ESO 578-9 Sy1 13 56 36.7127510898 -19 31 44.864098009   15.25   14.46   ~ 43 0
7 QSO B1424-41 QSO 14 27 56.29756536 -42 06 19.4375991   18.48 17.7 16.30   ~ 402 1
8 ICRF J152114.4+043021 AGN 15 21 14.4184382 +04 30 21.638316   18.2       ~ 94 1
9 4C 32.49 Rad 15 44 48.4 +32 08 45           ~ 14 0
10 QSO B1549-790 QSO 15 56 58.86989203 -79 14 04.2815029   18.80 18.800 17.84   ~ 185 1
11 3FGL J1617.4-5846 AGN 16 17 17.8913859288 -58 48 07.860059063   18.23       ~ 107 1
12 QSO B1610-771 QSO 16 17 49.2776951842 -77 17 18.469164198   19.19 19.0 17.32   ~ 145 1
13 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 572 1

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2021.09.17-17:52:25

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