Black hole feeding and star formation in NGC1808

被引:11
作者
Audibert, A. [1 ,2 ,3 ,4 ]
Combes, F. [1 ,5 ]
Garcia-Burillo, S. [6 ]
Hunt, L. [7 ]
Eckart, A. [8 ]
Aalto, S. [9 ]
Casasola, V [10 ]
Boone, F. [11 ]
Krips, M. [12 ]
Viti, S. [13 ,14 ]
Muller, S. [9 ]
Dasyra, K. [15 ,16 ]
van der Werf, P. [13 ]
Martin, S. [17 ,18 ]
机构
[1] PSL Univ, Sorbonne Univ, CNRS, Observ Paris,LERMA, Paris, France
[2] Natl Observ Athens NOA, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece
[3] Inst Astrofis Canarias, Calle Via Lactea S-N, Tenerife 38205, Spain
[4] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain
[5] Coll France, 11 Pl Marcelin Berthelot, F-75231 Paris, France
[6] Observ Astron Nacl OAN IGN, Observ Madrid, Alfonso XII 3, Madrid 28014, Spain
[7] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
[8] Univ Cologne, Phys Inst 1, Zulpicher Str 77, D-50937 Cologne, Germany
[9] Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
[10] INAF Ist Radioastron, Via Piero Gobetti 101, I-40129 Bologna, Italy
[11] CNRS, IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France
[12] LRAM, 300 Rue Piscine, F-38406 St Martin Dheres, France
[13] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
[14] UCL, Dept Phys & Astron, Gower Pl, London WC1E 6BT, England
[15] Natl & Kapodistrian Univ Athens, Fac Phys, Dept Astrophys Astron & Mech, Panepistimiopolis 15784, Greece
[16] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece
[17] European Southern Observ, Alonso de Cordova 3107, Santiago 7630355, Chile
[18] Joint ALMA Observ, Alonso de Cordova 3107, Santiago 7630355, Chile
关键词
galaxies: active; galaxies: starburst; galaxies: kinematics and dynamics; galaxies: ISM; galaxies: nuclei galaxies individual: NGC1808; SPIRAL GALAXY NGC-1808; MOLECULAR GAS; RADIO-CONTINUUM; ALMA IMAGES; LINE; OUTFLOW; NUCLEAR; EMISSION; FEEDBACK; TORUS;
D O I
10.1051/0004-6361/202039886
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on Atacama Large Millimeter Array (ALMA) observations of CO(3-2) emission in the Seyfert2/starburst galaxy NGC1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius 1 '' = 45 pc. Within it, we found a decoupled circumnuclear disk or molecular torus of a radius of 0:13 '' = 6 pc. The HCN(4-3) and HCO+(4-3) and CS(7-6) dense gas line tracers were simultaneously mapped and detected in the nuclear spiral and they present the same misalignment in the molecular torus. At the nucleus, the HCN/HCO+ and HCN/CS ratios indicate the presence of an active galactic nucleus (AGN). The molecular gas shows regular rotation, within a radius of 400 pc, except for the misaligned disk inside the nuclear spiral arms. The computations of the torques exerted on the gas by the barred stellar potential reveal that the gas within a radius of 100 pc is feeding the nucleus on a timescale of five rotations or on an average timescale of similar to 60 Myr. Some non-circular motions are observed towards the center, corresponding to the nuclear spiral arms. We cannot rule out that small extra kinematic perturbations could be interpreted as a weak outflow attributed to AGN feedback. The molecular outflow detected at >= 250 pc in the NE direction is likely due to supernovae feedback and it is connected to the kpc-scale superwind.
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页数:16
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