2017MNRAS.465.4772R -
Mon. Not. R. Astron. Soc., 465, 4772-4782 (2017/March-2)
A candidate dual AGN in a double-peaked emission-line galaxy with precessing radio jets.
RUBINUR K., DAS M., KHARB P. and HONEY M.
Abstract (from CDS):
We present high-resolution radio continuum observations with the Karl G. Jansky very large array at 6, 8.5, 11.5 and 15 GHz of the double-peaked emission-line galaxy 2MASXJ12032061+1319316. The radio emission has a prominent S-shaped morphology with highly symmetric radio jets that extend over a distance of ∼1.5 arcsec (1.74 kpc) on either side of the core of size ∼0.1 arcsec (116 pc). The radio jets have a helical structure resembling the precessing jets in the galaxy NGC 326 which has confirmed dual active galactic nuclei (AGN). The nuclear bulge velocity dispersion gives an upper limit of (1.56 ± 0.26) x 108 M☉ for the total mass of nuclear black hole(s). We present a simple model of precessing jets in 2MASXJ1203 and find that the precession time-scale is around 105 yr: this matches the source lifetime estimate via spectral ageing. We find that the expected supermassive black hole (SMBH) separation corresponding to this time-scale is 0.02 pc. We used the double-peaked emission lines in 2MASXJ1203 to determine an orbital speed for a dual AGN system and the associated jet precession time-scale, which turns out to be more than the Hubble time, making it unfeasible. We conclude that the S-shaped radio jets are due to jet precession caused either by a binary/dual SMBH system, a single SMBH with a tilted accretion disc or a dual AGN system where a close pass of the secondary SMBH in the past has given rise to jet precession.
Abstract Copyright:
∼
Journal keyword(s):
galaxies: active - galaxies: individual: 2MASX J12032061+1319316 - galaxies: jets - galaxies: Seyfert - radio continuum: galaxies - radio continuum: galaxies
Simbad objects:
19
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2017MNRAS.465.4772R and select 'bookmark this link' or equivalent in the popup menu