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Rob Sharp Anglo-Australian Observatory rgs@aao.au

IFU Mapping of AGN and Starburst Driven Outflows. Rob Sharp Anglo-Australian Observatory rgs@aao.gov.au. 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

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Rob Sharp Anglo-Australian Observatory rgs@aao.au

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  1. IFU Mapping of AGN and Starburst Driven Outflows Rob Sharp Anglo-Australian Observatory rgs@aao.gov.au

  2. 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

  3. 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

  4. Interpreting high redshift Analogues Low metallicity starburst disc Emily Wisnoiski (Karl Glazebrook & the WiggleZ team) A sample of strong [OII] galaxies SFR > 1000Msol/yr @ z~1.4 ? AO-IFS Spectroscopy with OSIRIS/Keck (spatial scale well matched to SPIRAL @z=0) Low-z templates key to high-z interpretation WiggleZ BAO project: Drinkwater et al. 2009 http://wigglez.swin.edu.au/site/

  5. IRAC/Spitzer Engelbracht 2006 HST/ACS 2006 Gallagher, Mountain & Puxley ACIS Strickland 2006 M82 is one of the best studied wind outflows Multi-phase gas (at least some of the phase) But…

  6. Gratuitous APOD image Schedler 2006 http://antwrp.gsfc.nasa.gov/apod/ap060415.html … it’s 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

  7. Cont. Ha [OIII] [OIII]/Hb 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

  8. Narrow band and Tuneable filter surveys • Excellent surface brightness sensitivity • Wide field of view But… • Limited kinematic information • Limited spectral line coverage

  9. AAOmega+SPIRAL • 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

  10. Dwarf ULIRG Multi-pointing IFS mosaics The Starburst sample The AGN sample Experimental pilot sample

  11. ~55,000 spectra later… Spectral data cubes across a range of key diagnostic features He/Hb/[OIII] [OI]/Ha/[NII]/[SII] Full sample in Sharp & Bland-Hawthorn (ApJ submitted)‏

  12. Cont. Ha [OIII] [OIII]/Hb Narrowband filters v. IFS AGN NGC 1365 – AAT/TTF Veilleux et al. 2003

  13. 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

  14. Example 1 : AGN NGC 1365 Indicative of the full AGN sample Off planer gas is photo-ionised by a hard spectrum source (AGN)

  15. 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

  16. 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?

  17. Ionisation Diagnostic Diagrams Confirming Shocks as the most likely excitation mechanism above the disk plane

  18. 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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