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J/A+A/614/A42       PKS B1718-649 ALMA observations          (Maccagni+, 2018)

ALMA observations of AGN fuelling. The case of PKS B1718-649. Maccagni F.M., Morganti R., Oosterloo T.A., Oonk J.B.R., Emonts B.H.C. <Astron. Astrophys. 614, A42 (2018)> =2018A&A...614A..42M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Radio lines ; Carbon monoxide Keywords: galaxies: individual: PKS B1718-649 - galaxies: active - galaxies: ISM - galaxies: kinematics and dynamics - ISM: cloud - submillimeter: ISM Abstract: We present ALMA observations of the 12CO (2-1) line of the newly born (tradio∼102years) active galactic nucleus (AGN), PKS B1718-649. These observations reveal that the carbon monoxide in the innermost 15 kpc of the galaxy is distributed in a complex warped disk. In the outer parts of this disk, the CO gas follows the rotation of the dust lane and of the stellar body of the galaxy hosting the radio source. In the innermost kiloparsec, the gas abruptly changes orientation and forms a circumnuclear disk (r≲700pc) with its major axis perpendicular to that of the outer disk. Against the compact radio emission of PKS B1718-649 (r∼2pc), we detect an absorption line at red-shifted velocities with respect to the systemic velocity (Δv=+365±22km/s). This absorbing CO gas could trace molecular clouds falling onto the central super-massive black hole. A comparison with the near-infra red H2 1-0 S(1) observations shows that the clouds must be close to the black hole (r≲75pc). The physical conditions of these clouds are different from the gas at larger radii, and are in good agreement with the predictions for the conditions of the gas when cold chaotic accretion triggers an active galactic nucleus. These observations on the centre of PKS B1718-649 provide one of the best indications that a population of cold clouds is falling towards a radio AGN, likely fuelling its activity. Description: The datacube was made using natural Briggs weighting and has been smoothed to a velocity resolution of 48km/s. The r.m.s. noise per channel of the data cube is 0.09mJy/beam. The size of the synthesized beam of the final data cube is 0.28"x0.19" (PA=41°), which, at the redshift of PKS B1718-649 corresponds to a spatial resolution of ∼82pc. Objects: ------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------ 17 23 41.03 -65 00 36.6 PKS B1718-649 = NGC 6328 ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 135 1 Informations on the datacube fits/* 0 1 Datacube
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
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- 31 I2 --- Nz Number of slices 33- 53 A21 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.s) 55- 58 I4 km/s bVELO-OBS Lower value of observed velocity interval 60- 63 I4 km/s BVELO-OBS Upper value of observed velocity interval 65- 66 I2 km/s dVELO-OBS Observed velocity resolution 68- 73 I6 Kibyte Size Size of FITS file 75- 91 A17 --- FileName Name of FITS file, in subdirectory fits 93-135 A43 --- Title Title of the FITS file
Acknowledgements: Filippo Maccagni, maccagni(at)
(End) Filippo Maccagni [INAF-OAC, Italy], Patricia Vannier [CDS] 12-Feb-2018
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