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Mid-IR High Ionization Lines in Starbursts

Mid-IR High Ionization Lines in Starbursts. Lei Hao Spitzer IRS Team Cornell University. The Spitzer Telescope Infrared Spectrograph (IRS). Low resolution modules (SL,LL) 5-40 m wavelength coverage Resolution: 64-128 High resolution modules (SH, LH) 9-38 m wavelength coverage

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Mid-IR High Ionization Lines in Starbursts

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  1. Mid-IR High Ionization Lines in Starbursts Lei Hao Spitzer IRS Team Cornell University

  2. The Spitzer Telescope Infrared Spectrograph (IRS) • Low resolution modules (SL,LL) • 5-40m wavelength coverage • Resolution: 64-128 • High resolution modules (SH, LH) • 9-38m wavelength coverage • Resolution: 600 • Data • IRS of ~40 Nearby famous AGN and starbursts (Weedman et al. 2005, Brandl et al. 2005, in prep) • 62 BCDs/11 IRS spectra (Wu et al 2005, submitted) • This talk: high resolution spectra of 11 BCDs +17 Starbursts (no AGN components)

  3. Mid-IR Fine Structure Emission lines • Less affected by extinction • Photoionized by massive stars • [OIV] in starbursts • Requires 54.24 eV, just above the HeII edge • Weaker than in AGNs, ULIRGs • Shocks, super-hot stars, weak AGN • [NeV] in starbursts • Not observed in pure starburst, an indication of AGN presence

  4. Mid-IR Fine Structure Emission lines

  5. Results • 11 BCDs + 17 Starbursts (no AGN component) • [OIV] is ubiquitous • 7/11 BCDs and 15/17 Starbursts

  6. Results • [NeV] is positively detected in three objects • 1/11 BCDs and 2/17 Starbursts CG0752 NGC4194 NGC2623

  7. Results

  8. Results

  9. Origin of the High Ionization Lines • Photoionization • Starburst99+Mappings

  10. Origin of the High Ionization Lines • Shock? by Lisa Kewley

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