J/A+A/633/A127 Jet-driven outflow in ESO 420-G13 (Fernandez-Ontiveros+, 2020)
A CO molecular gas wind 340 pc away from the Seyfert 2 nucleus in ESO 420-G13
probes an elusive radio jet.
Fernandez-Ontiveros J.A., Dasyra K.M., Hatziminaoglou E., Malkan M.A.,
Pereira-Santaella M., Papachristou M., Spinoglio L., Combes F., Aalto S.,
Nagar N., Imanishi M., Andreani P., Ricci C., Slater R.
<Astron. Astrophys. 633, A127 (2020)>
=2020A&A...633A.127F 2020A&A...633A.127F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Millimetric/submm sources
Keywords: ISM: jets and outflows - galaxies: active -
galaxies: individual: ESO420-G13 - submillimeter: ISM -
galaxies: evolution - techniques: high angular resolution
Abstract:
A prominent jet-driven outflow of CO(2-1) molecular gas is found along
the kinematic minor axis of the Seyfert 2 galaxy ESO 420-G13, at a
distance of 340-600pc from the nucleus. The wind morphology resembles
a characteristic funnel shape, formed by a highly collimated
filamentary emission at the base, likely tracing the jet propagation
through a tenuous medium, until a bifurcation point at 440pc where
the jet hits a dense molecular core and shatters, dispersing the
molecular gas into several clumps and filaments within the expansion
cone. We also trace the jet in ionised gas within the inner ∼340pc
using the [NeII]12.8um line emission, where the molecular gas follows
a circular rotation pattern. The wind outflow carries a mass of
∼8x106M☉ at an average wind projected speed of ∼160km/s,
which implies a mass outflow rate of ∼14M☉/yr. Based on the
structure of the outflow and the budget of energy and momentum, we
discard radiation pressure from the active nucleus, star formation,
and supernovae as possible launching mechanisms. ESO 420-G13 is the
second case after NGC 1377 where the presence of a previously unknown
jet is revealed due to its interaction with the interstellar medium,
suggesting that unknown jets in feeble radio nuclei might be more
common than expected. Two possible jet-cloud configurations are
discussed to explain the presence of an outflow at such distance from
the AGN. The outflowing gas will likely not escape, thus a delay in
the star formation rather than quenching is expected from this
interaction, while the feedback effect would be confined within the
central few hundred parsecs of the galaxy.
Description:
Reduced and calibrated datacube of the CO(2-1) continuum-subtracted
emission in ESO 420-G13, observed with the ALMA interferometer. The
final cube has a spectral resolution of 10km/s and a synthesised beam
of 0.11"x0.14" at PA=108deg. An ALMA cold dust continuum image at
1.2mm and a [NeII]12.8um emission-line map obtained with VLT/VISIR are
also included.
Objects:
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RA (2000) DE Designation(s)
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04 13 49.70 -32 00 25.2 ESO 420-G13 = ESO 420-13
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 177 3 List of fits files
fits/* . 3 Individual fits files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 24 F5.3 arcsec/pix scale ? Scale of the image
26- 28 I3 --- Nx Number of pixels along X-axis
30- 32 I3 --- Ny Number of pixels along Y-axis
34- 36 I3 --- Nz ? Number of pixels along Z-axis
38- 63 A26 "datime" Obs.date Observation date
65- 70 I6 Kibyte size Size of FITS file
72-107 A36 --- FileName Name of FITS file, in subdirectory fits
108-177 A70 --- Title Title of the FITS file
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Acknowledgements:
J.A. Fernandez-Ontiveros, j.a.fernandez.ontiveros(at)gmail.com
(End) Patricia Vannier [CDS] 20-Dec-2019