Millimeter interferometric investigations of the energy sources of nearby ULIRGs

Masa Imanishi

（ NAO Japan ）

NLR

Buried AGNs

ULIRGs: powerful energy sources hidden behind dust

Obscured by torus-shaped dust

Buried AGNs (=X-ray source) produce XDRs

HC

N/H

CO

+HCN/CO

starburst

pure AGN

XDRs and PDRs(starbursts)are distinguishable from mm line ratios

ULIRGs with buried AGNs

ULIRGs withoutburied AGNs

Pure AGN

Starburst

The AGN-nuclear starburst connections in Seyfert 1 and 2 galaxies

Masa Imanishi

（ NAO Japan ）

Nuclear stabursts in a dusty torus

Dust torus is rich in molecular gas

Nuclear starbursts may occur

Sy1

Sy2

PAH

3.3um PAH

3.3um PAH

PAH = starburst tracer

L(3

.3 P

AH

)=

nu

clea

r st

arb

urs

t

Nuclear N-band, radio core = AGN power

nuclear starburst luminosity : Sy1s = Sy2s

L(nuclear starburst) and L(AGN): correlate

Imanishi 2003 ApJ 599 918 Imanishi and Wada 2004 ApJ 617 214