Rob Sharp

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IFU Mapping of AGN and Starburst Driven Outflows
Rob Sharp Anglo-Australian Observatory rgs_at_aao.gov
.au
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• Optical integral field spectroscopy
• A sample of nearby starburst wind galaxies
• Across a range of luminosity classes
• With and without evidence of AGN activity

Joss Bland-Hawthorn Sharp Bland-Hawthorn ApJ
submitted
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What might we learn? (From optical Integral field
spectroscopy)

• Energy sources and time scales for galactic
  winds
• Kinematic measurements of out-flowing gas
• - difficult at other wavelengths (with current
  technology)
• Provide critical boundary conditions
• - coupling multi-phase observations and
  simulations
• Moderate spatial resolution
• - allowing interpretation of high redshift system

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Interpreting high redshift Analogues
Low metallicity starburst disc
Emily Wisnoiski (Karl Glazebrook the WiggleZ
team)
A sample of strong OII galaxies SFR gt
1000Msol/yr _at_ z1.4
?
AO-IFS Spectroscopy with OSIRIS/Keck (spatial
scale well matched to SPIRAL _at_z0)
Low-z templates key to high-z interpretation
WiggleZ BAO project Drinkwater et al. 2009
http//wigglez.swin.edu.au/site/
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M82 is one of the best studied wind outflows
Multi-phase gas (at least some of the phase)
But
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its a bit of a freak
HST/ACS

• Low mass galaxy with a huge specific star
  formation rate
• May not be our single best laboratory
• Need a broader census survey

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Narrow band and Tuneable filter surveys
Starburst NGC 1482 AAT/TTF Veilleux Rupke
2002 Shocked gas excitation?
AGN NGC 1365 AAT/TTF Veilleux et al. 2003
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Narrow band and Tuneable filter surveys

• Excellent surface brightness sensitivity
• Wide field of view
• But
• Limited kinematic information
• Limited spectral line coverage

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AAOmegaSPIRAL

• Dual beam spectrograph
• 512 element fibre feed
• 32x16 rectangular array
• 0.7 arcsec square pixels
• 11.2x22.4 arcsec FoV
• Real time data reduction with 2dfdr

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Multi-pointing IFS mosaics
The Starburst sample
The AGN sample
Experimental pilot sample
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55,000 spectra later
Spectral data cubes across a range of key
diagnostic features He/Hb/OIII OI/Ha/NII/SI
I
Full sample in Sharp Bland-Hawthorn (ApJ
submitted)?
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Narrowband filters v. IFS AGN NGC 1365
AAT/TTF Veilleux et al. 2003
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Ionisation Diagnostic Diagrams Baldwin, Phillips
Terlevich 1981 Veilleux Osterbrock
1987 Kewley et al. 2001
Blue AGN photo-ionisation
Green - Starformation
Red - Shocks
Strong signatures from starformation in
disk Spectral line profile deconvolution should
be possible when guided by kinematic modelling
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Example 1 AGN NGC 1365 Indicative of the full
AGN sample
Off planer gas is photo-ionised by a hard
spectrum source (AGN)
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AGN ionisation cones
Subsequent analysis may allow direct probes of
the central engine e.g. Cooke, Kuncic, Sharp
Bland-Hawthorn 2007 Cooke, Bland-Hawthorn,
Sharp Kuncic 2008
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Example 2 Starburst NGC 1482 No evidence for an
AGN across multiple frequencies Indicative of
full starburst sample
AAT/TTF Veilleux Rupke 2002 Shocked gas
excitation?
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Ionisation Diagnostic Diagrams
Confirming Shocks as the most likely excitation
mechanism above the disk plane
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• Conclusion
• Continues starformation model unlikely
• Significant delay (10Myr) after starburst
  activity before wind launch

(SB99 model, upper mass cut-offs of 30 and 100
Msun )
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