J/A+A/593/A118 HCN(1-0) cube for the nucleus of M51 (Querejeta+, 2016)
AGN feedback in the nucleus of M51.
Querejeta M., Schinnerer E., Garcia-Burillo S., Bigiel F., Blanc G.A.,
Colombo D., Hughes A., Kreckel K., Leroy A.K., Meidt S.E., Meier D.S.,
Pety J., Sliwa K.
<Astron. Astrophys. 593, A118 (2016)>
=2016A&A...593A.118Q 2016A&A...593A.118Q (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Molecular clouds ; Galaxies, radio
Keywords: galaxies: ISM - galaxies: active - galaxies: Seyfert -
galaxies: structure - galaxies: jets
Abstract:
AGN feedback is invoked as one of the most relevant mechanisms that
shape the evolution of galaxies. Our goal is to understand the
interplay between AGN feedback and the interstellar medium in M51, a
nearby spiral galaxy with a modest AGN and a kpc-scale radio jet
expanding through the disc of the galaxy. For that, we combine
molecular gas observations in the CO(1-0) and HCN(1-0) lines from the
Plateau de Bure interferometer with archival radio, X-ray, and optical
data. We show that there is a significant scarcity of CO emission in
the ionisation cone, while molecular gas emission tends to accumulate
towards the edges of the cone. The distribution and kinematics of CO
and HCN line emission reveal AGN feedback effects out to r∼500pc,
covering the whole extent of the radio jet, with complex kinematics in
the molecular gas which displays strong local variations. We propose
that this is the result of the almost coplanar jet pushing on
molecular gas in different directions as it expands; the effects are
more pronounced in HCN than in CO emission, probably as the result of
radiative shocks. Following previous interpretation of the redshifted
molecular line in the central 5" as caused by a molecular outflow, we
estimate the outflow rates to be MdotH2∼0.9M☉_/yr and
dM/dtdense∼0.6M☉/yr, which are comparable to the molecular
inflow rates (∼1M☉/yr); gas inflow and AGN feedback could be
mutually regulated processes. The agreement with findings in other
nearby radio galaxies suggests that this is not an isolated case, and
probably the paradigm of AGN feedback through radio jets, at least for
galaxies hosting low-luminosity active nuclei.
Description:
HCN(1-0) datacube from the Plateau de Bure interferometer for the
central R<50" (R<1.85kpc) of the galaxy M51 (NGC5194). The
interferometric data correspond to observations from Plateau de Bure
in C and D configurations, carried out between August 2011 and
November 2014. This is the reduced cube calibrated and cleaned using
GILDAS, with natural weighting, which includes short spacing
corrections from the IRAM 30m telescope (Bigiel et al.,
2016ApJ...822L..26B 2016ApJ...822L..26B). The synthesised beam is 4.81"x3.94". See the
paper for details.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
13 29 52.70 +47 11 42.9 M51 = NGC 5194
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 106 1 Information on fits datacube
M51-HCN.fit 2880 10925 Fits datacube
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See also:
J/A+A/568/A74 : Low-frequency (115-175MHz) image of M51 (Mulcahy+, 2014)
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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of slices
32- 35 F4.1 km/s bVRAD Lower value of VRAD interval
37- 41 F5.1 km/s BVRAD Upper value of VRAD interval
43 I1 km/s dVRAD VRAD resolution
45- 49 I5 Kibyte size Size of FITS file
51- 61 A11 --- FileName Name of FITS file
63-106 A44 --- Title Title of the FITS file
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Acknowledgements:
Miguel Querejeta, querejeta(at)mpia.de
(End) Miguel Querejeta [MPIA, Germany], Patricia Vannier [CDS] 11-Jul-2016