English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have observed the nucleus of the nearby luminous infrared galaxy NGC 4418with subarcsec resolution at 860 and 450 micron for the first time tocharacterize its hidden power source. A ~20 pc (0.1") hot dusty core was foundinside a 100 pc scale concentration of molecular gas at the galactic center.The 860 micron continuum core has a deconvolved (peak) brightness temperatureof 120-210 K. The CO(3-2) peak brightness temperature there is as high as 90 Kat 50 pc resolution. The core has a bolometric luminosity of about 10^{11}Lsun, which accounts for most of the galaxy luminosity. It is Compton thick(N_H >~ 10^{25} cm^{-2}) and has a high luminosity-to-mass ratio ~500 Lsun/Msunas well as a high luminosity surface density 10^{8.5+-0.5} Lsun pc^{-2}. Theseparameters are consistent with an AGN to be the main luminosity source (with anEddington ratio about 0.3) while they can be also due to a young starburst nearits maximum L/M. We also found an optical color (reddening) feature that weattribute to an outflow cone emanating from the nucleus. The hidden hot nucleusthus shows evidence of both an inflow, previously seen with absorption lines,and the new outflow reported here in a different direction. The nucleus must berapidly evolving with these gas flows.

Submillimeter Interferometry of the Luminous Infrared Galaxy NGC 4418: A Hidden Hot Nucleus with an Inflow and an Outflow