Subaru and Gemini high-spatial-resolution 20um imaging of nearby LIRGs

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Presentation transcript:

Subaru and Gemini high-spatial-resolution 20um imaging of nearby LIRGs Masa Imanishi （今西　昌俊） NAOJ (Subaru Telescope) Subaru Gemini-S

ULIRGs:>1012Lo Luminous infrared galaxies（LIRGs） L(IR) > 1011 Lo (Normal spiral ~ 1010 Lo) optical IR (U)LIRGs IR optical M100（Sbc） Luminous energy source is hidden behind dust

(U)LIRGs Luminous energy sources behind dust > 10kpc L(IR) > 1011Lo Luminous energy sources behind dust Starburst > 10kpc AGN Mass accretion onto supermassive blackholes（>106 Mo） < 1pc

(U)LIRGs: important at high-z Caputi et al. 2007 2 ULIRG LIRG 1 ULIRG Le Floc’h et al. 2005 LIRG 1 LIRG ULIRG

AGNs in (U)LIRGs are buried Veilleux+99 Sy2 NLR AGNs obscured by torus-shaped dust HII LI Sy2 Detectable via optical spectroscopy (U)LIRGs have a large amount of nuclear gas and dust Buried AGNs are elusive >70% (U)LIRGs = non-Sy Veilleux+99;Yuan+10

IR spectroscopy AKARI 2.5-5um Normal SB Buried AGN ★ Extreme SB (?) PAH Normal SB Buried AGN AGN ★ SB Extreme SB (?)

★ Thompson+05 Emission surface brightness Buried AGN E = 6-40% Mc2 SB >>1013 Lo / kpc2 M82 SB 1011 Lo / kpc2 <1013 Lo / kpc2 M42 HII-region core Supported by Eddington-limited SB theory Thompson+05

If >>1013 Lo / kpc2, then buried AGN Ground-based large 8-10m telescope is better than space satellites (0.7-0.85m) PAH contamination small Diffraction-limited image achieved Stable PSF Why 20um?

Imanishi+11 Subaru COMICS Diffraction-limited images are usually achieved 20um compact extended Standard star size<0.2” 1012 Lo / kpc2 Mitsubishi- pattern >3*1013 Lo / kpc2 Imanishi+11

Imanishi+11 Gemini-S/T-ReCS Diffraction-limited images are usually achieved 20um extended Standard star compact <1012 Lo / kpc2 size<0.25” Diffraction ring >2*1013 Lo / kpc2 Imanishi+11

Super star cluster NGC 5253 (d=4Mpc) Gemini-S T-ReCS 20um ~1013 Lo / kpc2 Imanishi+11 submitted

IR spectroscopy vs imaging (I) (z=0.016) extended SB ~1012 Lo / kpc2 (z=0.025)

IR spectroscopy vs imaging (II) B-AGN (z=0.058) compact >1013 Lo / kpc2 (z=0.055)

Distant ULIRGs (z>0.1) >0.5*1013 Lo/kpc2 Need higher-spatial-resolution of TMT/MICHI

Summary Imanishi+11 submitted (accepted soon) B-AGN and SB are distinguishable, based on 20um emission surface brightness, if z < 0.06 Generally agree with IR spectroscopic energy diagnostic method Imanishi+11 submitted (accepted soon)

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