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Mid-IR High Ionization Lines in Starbursts

This presentation explores high resolution spectra of 11 blue compact dwarfs (BCDs) and 17 starbursts, obtained using the Spitzer Infrared Spectrograph (IRS). The study focuses on mid-infrared fine structure emission lines, particularly the [OIV] line which is prevalent in starbursts and indicative of massive star photoionization. The detection of [NeV] serves to highlight AGN presence. Results detail the high ionization lines’ origins, linking them to starburst activity, and discuss implications for understanding star formation and galaxy evolution.

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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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