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AGNs with the VLTI. Cygnus A:I What’s an AGN What’s an AGN? (L = 10^46 erg/s)‏ Radio Jet 300 kpc Narrow Line 1 kpc [dusty

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Presentation on theme: "AGNs with the VLTI. Cygnus A:I What’s an AGN What’s an AGN? (L = 10^46 erg/s)‏ Radio Jet 300 kpc Narrow Line 1 kpc [dusty"— Presentation transcript:

1 AGNs with the VLTI

2 Cygnus A:I

3 What’s an AGN What’s an AGN? (L = 10^46 erg/s)‏ Radio Jet 300 kpc Narrow Line 1 kpc [dusty Broad Line Region 0.1 pc Hot Accretion disk 10 AU Black Hole (10^8 1 AU

4 MIDI Observations of AGNs Walter Jaffe: Leiden Observatory Klaus Meisenheimer:MPIA Heidelberg Konrad Tristram: MPIA David Raban: Leiden

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6 N1068 ions NGC 1068

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12 What do we see with VLTI What do we see with VLTI (~10 mas)‏ at the distance of ~14 Mpc? (1”=70pc)‏ Radio Jet (maybe optically thick core)‏ Narrow Line 14” (too big)‏ Dusty mas (!)‏ Broad Line 1 mas (too small)‏ Hot Accretion 1 microarcsec (“)‏ Black Hole (10^8 0.1 microarcsec

13 What do we see from dust? What do we expect to see from dust? T= K (r=1 pc -> 200 pc) 1000 K ~ sublimation temperature =4  -> 100 

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15 Granato plots Granato et al 1997

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18 What do we see from dust? Seyfert 1 | Seyfert 2 Round Flattened If optically thick: Core dominated? Extended Silicate emission? Silicate absorption

19 Prime Questions: Do obscuring torii really exist? if so: shape size orientation temperature clumpiness chemistry What supports thick disk/torus?

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23 MIDI Prime Targets: Close, big, bright: NGC 1068, Circinus, Cen A Secondary Targets: not so close/big/bright ~10 Sy 1+2 ; 1 quasar (3c273) ‏ 1 Starburster

24 N1068 uv

25 First data plots n1068

26 N1068 dirty map

27 Pink ellipse

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31 Circinus: Gaussian fit Two blackbody Gaussians: Log of model flux distribution at 11µm Tristram et al. 2007

32 Greenhill 2003: Water Masers

33 Cen A = NGC 5128

34 Centaurus A: Fluxes Flux in F [Jy] PA~108°, BL~60.3m PA~ 37°, BL~45.3m Total flux spectrum Wavelength λ [μm] N → mostly unresolved

35 Energy νF ν [Hz Jy] Frequency ν [Hz] MIDI Meisenheimer et al. 2007

36 C1/C2 C2 C2/C3 C3 Core CJ2 CJ Right Ascension (mas)‏ Relative Declination (mas)‏ 10 mas 127° ± 9° 0.19 pc baseline orientation Feb 28 May 26 N E 50° jet axis Bulk of the MIR radiation is synchrotron emission

37 0Sy 2?NGC 7582 NASy 2?NGC 7479 NAStarB?NGC 5253 XSy 1~1JyNGC StarB/Sy 2?NGC 253 X X (res?)‏ X X X X X X X X+VINCI Detect? QSO Sy 1 Sy 2 Sy 1 Sy 2 Sy 1 RG Sy 2 Type 0.6 JyNGC JyNGC JyMCG JyIC 4329A Flux (10 µm)‏Name 0.6 JyCen A 5 JyCircinus 13 JyNGC Jy 0.4 Jy 0.5 Jy 3C 273 Mrk 1239 NGC 3783

38 3C Wavelength λ [μm] Flux F [Jy] ozone band correlated flux F cor (2007 Feb 07)‏ power law fit: F cor ~ ν 2.0 VISIR photometry (1.1", 2007 Mar 01)‏ Spitzer spectrum (2004 Jan 06)‏

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40 conclusions Conclusions: Best studied dust disks: Agree in size/orientation with H2O masers. Disks are smaller than (some) SED predictions, and probably clumpy NGC1068 disk is tipped wrt both jet and ionization cone. Interesting dust chemistry.

41 conclusions NONUNIFIED TORI: Some are tipped wrt natural axes; Some aren’t. Some have inner edge at sublimation radius. Some don’t. Some have strong MIR emission (Sy 2, quasar). Some don’t (RG). Basic Sy1/2 unification not yet tested but see NGC 4151.

42 conclusions AGN Survey Conclusions: Weak but nonzero dust emission in Radio Galaxy (Cen A) ‏ Most Seyferts show “optically thin” spectra, little SiO abs. 1(2) Sy1 resolved(?); no SiO emission

43 conclusions Homework: What diameter telescopes are needed to measure 10  flux from optically thick 300 K dust on 1000 meter baseline? Assume noise comes from photon noise from optical train (50% absorption) and integration/coherence time is 1 second.


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