Tracing the coronal emission in AGN with VLT/NACO
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Tracing the coronal emission
in AGN with VLT/NACO
Olivier MarcoOlivier Marco
NACO is here !
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What is an AGN ?
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AGN: a closer view
Scale: << 1 pc
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From seeing limited to AO images
2mass10”x10”
DSS infrared60”x60”
An example: NGC1068
COME-ON+
1”x1”
NACO
1”x1”deconvolved
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So we can we NACO for AGN…
Yes !
But… very red objects & extended
Visible-WFS (all IR flux to CONICA)
or
IR-WFS with 90% flux to WFS… not much left for CONICA (10%) hard for NB filters & spectroscopy
Usually (always ?) self-reference hard to get a (real) PSF
Extended objects hard to get a sky (even with jittering)
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Circinus
HST &
NACO J, Ks
combined images
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What/where is the coronal region in an
AGN ?What: region of high density gas where lines of high ionization (IP > 50 eV) species are excited
Where: very close to the ionization source (UV X-ray), BLRNLR & farther away(photoionized by the nuclear continuum or excited by fast (v>300 km/s) shocks)
Coronal lines can be used to directly pinpoint the location of the AGN, and measure a (parsec-scale) size
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Ionization Potential vs line width of the
forbidden lines– An example: 1H 1934-063 (Sy1)(Rodriguez-Ardilla et al., ApJ 2003)
Line IP eV FWHM km/s
[Si VI] 167 650
[Fe XI] 262 1000
[Fe XIII] 331 1600
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Why use [Si VII] 2.48 µm ?
Already detected in NGC1068Our sample: Circinus, ESO428+G014, NGC3081
[Si VI] 1.963 µm is contaminated by H2 1-0 S(3) 1.957 µm
[Si VII] is very strong
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NACO images of Circinus
Coronal emission shows:
Extended (resolved) emission (10 pc diameter)
Hot dust mixed with CLR & NLR
FWHM:
0.12"
2.42 µm continnum [Si VII] 2.48 µm line
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Where the CLR spots the true nucleus & the apex
of the H coneAstrometry of [Si VII] vs HST H
[Si VII] 2.48µm line emissionon top of HST H image
True color image with HST 8140 Å
NACO J & K bands
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NACO images of ESO428
Coronal region shows:– A bright unresolved peak (size 10 pc)
[Si VII] 2.48µm line emission 2.42µm continuum emission
FWHM:
4.3 pixels= 0.12"
same on stars into the field & PSF
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H vs [Si VII]
ESO428 NGC3081
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More to come…
Survey has 4 objects but already…2 objects have shown the possibilities of:– Localization of the central source of the AGN– Measure size of [Si VII]-CLR (limit of NLR)– Trace cone illumination
Relation with luminosity of the central engine?Fast shocks (v300 km/s) along the radio jet?
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