SUBARU and e-Merlin observations of NGC3718. Diaries of an SMBH recoil?

摘要: NGC3718 is a LINER $L1.9$ galaxy, lying at distance of about $\sim 17.4$ Mpc away from earth and its similarities with NGC5128 often award it the name "northern Centaurus A". We use high angular resolution ($\sim100$ mas) e-Merlin radio SUBARU NIR ($\sim170$ data, to take detailed view processes taking place in central region. In order preserve some objectivity our interpretation, we combine results literature values findings previous studies. Our maps suggest, on one hand, that towards stellar bulge there are no large scale absorption phenomena caused by apparent dust lane and, other, significant (local) contribution hot ($\sim1000$ K) nuclear emission. The position where this takes appears be closer offset compact emission $6$ cm map, $\sim4.25$ pc center underlying bulge. shape map suggests presence (or possibly two, forming an X-shape) bipolar structure(s) $\sim1$ ($\sim0.6$) arcsec across, which combined balance between gas velocity dispersions hard X-ray emission, point effects expected AGN feedback. also argue has "core" surface brightness profile, despite fact gas-rich galaxy discuss mixed photometric spectroscopic characteristics. latter observed spatial offsets, relative redshift broad narrow $H{\mathrm{\alpha}}$ line, limited star formation activity feedback, strongly imply existence SMBH recoil. Finally, possible could naturally incorporate all these into physically consistent picture.