Circumnuclear dense gas disk fuelling the active galactic nucleus in the nearby radio galaxy NGC 4261
arXiv:2208.05079 · doi:10.1051/0004-6361/202244047
Abstract
The cold molecular gas in the circumnuclear disk (CND) of radio galaxies provides critical information for understanding the mass accretion onto active galactic nuclei. We present the first detection and maps of HCN J=1-0 and HCO+ J=1-0 emission lines from the circumnuclear region of a nearby radio galaxy, NGC 4261, using the Northern Extended Millimeter Array. Both molecular lines are detected at a radial velocity of +-700 km/s relative to the systemic velocity of the galaxy, and they arise from a CND with an outer radius of 100 pc. The velocity fields of HCN and HCO+ are fitted with a Keplerian disk rotation. The enclosed mass is (1.6+-0.1)x10^9 M_solar, assuming a disk inclination angle of 64 degree. The continuum image at 80 GHz reveals a weak two-sided jet structure extending over 5 kpc along the east-west direction and a bright core at the centre. The continuum spectrum between 80 and 230 GHz shows a spectral index of -0.34+-0.02, which suggests optically thin synchrotron radiation. The dense gas mass associated with the CND is calculated to be 6.03x10^7 M_solar. It supports a positive correlation between the dense gas mass in the CND and the accretion rate onto the supermassive black hole, though there are uncertainties in the parameters of the correlation.
6 pages, 4 figures, accepted for publication in A&A
References in corpus (18)
- Hot and cold gas accretion and feedback in radio-loud active galaxies
- ALMA images the many faces of the NGC1068 torus and its surroundings
- A black-hole mass measurement from molecular gas kinematics in NGC4526
- BAT AGN Spectroscopic Survey-XX: Molecular Gas in Nearby Hard X-ray Selected AGN Galaxies
- The AGN fuelling/feedback cycle in nearby radio galaxies - I. ALMA observations and early results
- Black Hole Mass Measurements of Radio Galaxies NGC 315 and NGC 4261 Using ALMA CO Observations
- WISDOM Project - III: Molecular gas measurement of the supermassive black hole mass in the barred lenticular galaxy NGC4429
- The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Material
- WISDOM project -- V. Resolving molecular gas in Keplerian rotation around the supermassive black hole in NGC 0383
- Star Formation Occurs in Dense Gas, but What Does "Dense" Mean?
- ALMA Observations of Circumnuclear Disks in Early Type Galaxies: 12CO(2-1) and Continuum Properties
- A Massive Molecular Torus inside a Gas-Poor Cirnumnuclear Disk in the Radio Galaxy NGC 1052 Discovered with ALMA
- Universal transition diagram from dormant to actively accreting supermassive black holes
- Properties of the Obscuring Torus in NGC 1052 from Multi-epoch Broadband X-ray Spectroscopy
- A search for ionised gas outflows in an Halpha imaging atlas of nearby LINERs
- ALMA Observations of the Physical and Chemical Conditions in Centaurus A
- Diffuse Synchrotron Emission Associated with the Starburst in the Circumnuclear Disk of NGC 1275
- HCN (1-0) opacity of outflowing gas in Arp 220W