J/A+A/632/A61 NGC1068 CO and HCO images (Garcia-Burillo+, 2019)
ALMA images the many faces of the NGC1068 torus and its surroundings.
Garcia-Burillo S., Combes F., Ramos Almeida C., Usero A., Alonso-Herrero A.,
Hunt L.K., Rouan D., Aalto S., Querejeta M., Viti S., van der Werf P.P.,
Vives-Arias H., Fuente A., Colina L., Martin-Pintado J., Henkel C.,
Martin S., Krips M., Gratadour D., Neri R., Tacconi L.J.
<Astron. Astrophys. 632, A61 (2019)>
=2019A&A...632A..61G 2019A&A...632A..61G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Carbon monoxide ; Radio lines
Keywords: galaxies: individual: NGC 1068 - galaxies: ISM -
galaxies: kinematics and dynamics - galaxies: nuclei -
galaxies: Seyfert - radio lines: galaxies
Abstract:
We investigate the fueling and the feedback of nuclear activity in the
Seyfert 2 galaxy NGC1068, by studying the distribution and kinematics
of molecular gas in the torus and its connections. We use ALMA to
image the emission of a set of molecular gas tracers in the
circumnuclear disk (CND) and the torus of the galaxy using the
CO(2-1), CO(3-2) and HCO+(4-3) lines with spatial resolutions
∼0.03"-0.09"(2-6pc). ALMA resolves the CND as an asymmetric ringed
disk of D∼400pc-size and mass of ∼1.4x108M☉. The inner edge of
the ring is associated with edge-brightened arcs of NIR polarized
emission identified with the working surface of the AGN ionized wind.
ALMA proves the existence of a molecular torus of M_torus
∼3x105M☉, which extends over a large range of spatial scales
D=10-30pc around the central engine. The new observations evidence the
density radial stratification of the torus: the HCO+(4-3) torus, with
a full size D=11pc, is a factor of 2-3 smaller than its CO(2-1) and
CO(3-2) counterparts, which have full-sizes D=26pc and D=28pc,
respectively. The torus is connected to the CND through a network of
gas streamers. The kinematics of molecular gas show strong departures
from circular motions in the torus, the gas streamers, and the CND.
These velocity distortions are interconnected and are part of a 3D
outflow that reflects the effects of AGN feedback on the kinematics of
molecular gas across a wide range of spatial scales. We conclude that
a wide-angle AGN wind launched from the accretion disk is impacting a
sizeable fraction of the gas inside the torus (∼0.4-0.6xMtorus).
However, a large gas reservoir (∼1.2-1.8x105M☉) close to the
equatorial plane of the torus remains unaffected by the AGN wind and
can continue fueling the AGN for ∼1-4Myr. AGN fueling seems
nevertheless thwarted on intermediate scales (15pc<r<50pc).
Description:
The velocity-integrated intensity maps obtained in the CO(2-1),
CO(3-2), and HCO+(4-3) molecular lines in the Seyfert 2 galaxy
NGC1068 (M77) by the Atacama Large Millimeter Array (ALMA). The
interferometric observations were carried out between October 2016 and
September 2017. The datasets presented here were imaged with
synthesised beams of 0.11"x0.068"@PA=80° for the CO(2-1) line,
0.13"x0.065"@PA=100° for the CO(3-2) line, and
0.081"x0.046"@PA=78° for the HCO+(4-3) line. The images are in
FITS-format. The intensity scale is in Jy.km/s/beam and has been
corrected by the Primary Beam attenuation at each frequency. See the
paper for further details.
Objects:
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RA (2000) DE Designation(s)
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02 42 40.709 -00 00 47.94 M77 = NGC 1068
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 105 3 List of fits maps
fits/* . 3 Individual fits maps
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See also:
J/A+A/602/A78 : NGC1068 interferometric mid-IR measurements
(Lopez-Gonzaga+, 2017)
J/A+A/613/A3 : NGC1068 deep millimeter spectroscopy observations (Qiu+, 2018)
J/A+A/625/A100 : NGC 1068 SPHERE-VLT images (Rouan+, 2019)
J/ApJ/591/138 : Chandra X-ray sources of NGC 1068 (Smith+, 2003)
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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 34 I5 Kibyte size Size of FITS file
36- 71 A36 --- FileName Name of FITS file, in subdirectory fits
73-105 A33 --- Title Title of the FITS file
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Acknowledgements:
Santiago Garcia-Burillo, s.gburillo(at)oan.es
(End) Patricia Vannier [CDS] 31-Oct-2019