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Gamma-Ray Probes of the Star-Forming Universe and Cosmic-Ray History Collaborators Vasiliki Pavlidou Tijana Prodanovic Amy Lien Brian Fields Fermi Symposium Nov 4, 2009 Gamma-Ray Probes of the Star-Forming Universe and

  1. Gamma-Ray Probes of the Star-Forming Universe and Cosmic-Ray History Collaborators Vasiliki Pavlidou Tijana Prodanovic Amy Lien 連雅琳 Brian Fields Fermi Symposium Nov 4, 2009

  2. Gamma-Ray Probes of the Star-Forming Universe and Cosmic-Ray History Collaborators Vasiliki Pavlidou Tijana Prodanovic Amy Lien 連雅琳 Brian Fields Fermi Symposium Nov 4, 2009

  3. Cosmic Rays and the Gauranteed Gamma-Ray Background diffuse Fermi sky: Porter, Digel, Ackermann talks Galactic plane dominates due to cosmic-ray propagation p cr p ism → π 0 → γγ working hypothesis: supernovae are engines of cosmic-ray acceleration star formation supernovae cosmic rays Brian Fields Fermi Symposium Nov 4, 2009

  4. Cosmic Rays and the Gauranteed Gamma-Ray Background diffuse Fermi sky: Porter, Digel, Ackermann talks Galactic plane dominates due to cosmic-ray propagation p cr p ism → π 0 → γγ working hypothesis: supernovae are engines of cosmic-ray acceleration star formation supernovae cosmic rays ★ resolved star-forming galaxies: new cosmic-ray laboratory Pavlidou & BDF 01; Knodlseder, Bechtol, Karlsson talks Brian Fields Fermi Symposium Nov 4, 2009

  5. Cosmic Rays and the Gauranteed Gamma-Ray Background diffuse Fermi sky: Porter, Digel, Ackermann talks Galactic plane dominates due to cosmic-ray propagation p cr p ism → π 0 → γγ working hypothesis: supernovae are engines of cosmic-ray acceleration star formation supernovae cosmic rays ★ resolved star-forming galaxies: new cosmic-ray laboratory Pavlidou & BDF 01; Knodlseder, Bechtol, Karlsson talks ★ but most galaxies unresolved: guaranteed contribution to diffuse background Pavlidou & BDF 02; Prodanovic & BDF 06 Brian Fields Fermi Symposium Nov 4, 2009

  6. Fermi Star-Forming Signal: Cosmic-Ray Source History Brian Fields Fermi Symposium Nov 4, 2009

  7. Fermi Star-Forming Signal: Cosmic-Ray Source History • each galaxy: gamma spectrum: pionic (Galactic) Abdo et al 2009 Brian Fields Fermi Symposium Nov 4, 2009

  8. Fermi Star-Forming Signal: Cosmic-Ray Source History • each galaxy: gamma spectrum: pionic (Galactic) feature! pion bump Abdo et al 2009 Brian Fields Fermi Symposium Nov 4, 2009

  9. Fermi Star-Forming Signal: Cosmic-Ray Source History • each galaxy: gamma spectrum: pionic (Galactic) gamma luminosity: scaling law L γ ∼ Φ cr N targets ∼ (SN rate) × M gas feature! pion bump Abdo et al 2009 Brian Fields Fermi Symposium Nov 4, 2009

  10. Fermi Star-Forming Signal: Cosmic-Ray Source History • each galaxy: gamma spectrum: pionic (Galactic) gamma luminosity: scaling law L γ ∼ Φ cr N targets ∼ (SN rate) × M gas • cosmic star-form rate cosmic star-forming emissivity L γ ∼ (cosmic SN rate) � M gas � cosmic supernova rate today: from cosmic star-formation rate future: directly count SNe to z~1 Lien & BDF 09 redshift z Hopkins & Beacom 2006 Brian Fields Fermi Symposium Nov 4, 2009

  11. Fermi Star-Forming Signal: Cosmic-Ray Source History • each galaxy: gamma spectrum: pionic (Galactic) gamma luminosity: scaling law L γ ∼ Φ cr N targets ∼ (SN rate) × M gas • cosmic star-form rate cosmic star-forming emissivity L γ ∼ (cosmic SN rate) � M gas � cosmic supernova rate today: from cosmic star-formation rate future: directly count SNe to z~1 Lien & BDF 09 • total diffuse intensity I γ ∼ c � dt L γ redshift z 4 π Hopkins & Beacom 2006 Brian Fields Fermi Symposium Nov 4, 2009

  12. Theory vs Observation Preliminary Status Brian Fields Fermi Symposium Nov 4, 2009

  13. Theory vs Observation Preliminary Status Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Brian Fields Fermi Symposium Nov 4, 2009

  14. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Brian Fields Fermi Symposium Nov 4, 2009

  15. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted ✓ amplitude: substantial part of preliminary Fermi signal Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Points: Ackerman talk, url http://www-conf.slac.stanford.edu/tevpa09Ackermann090714v2.ppt Brian Fields Fermi Symposium Nov 4, 2009

  16. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted ✓ amplitude: substantial part of preliminary Fermi signal ✓ physics: probes cosmic star formation: source luminosity vs density evolution Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Points: Ackerman talk, url http://www-conf.slac.stanford.edu/tevpa09Ackermann090714v2.ppt Brian Fields Fermi Symposium Nov 4, 2009

  17. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted ✓ amplitude: substantial part of preliminary Fermi signal ✓ physics: probes cosmic star formation: source luminosity vs density evolution Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Points: Ackerman talk, url http://www-conf.slac.stanford.edu/tevpa09Ackermann090714v2.ppt Brian Fields Fermi Symposium Nov 4, 2009

  18. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted ✓ amplitude: substantial part of preliminary Fermi signal ✓ physics: probes cosmic star formation: source luminosity vs density evolution Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep Points: Ackerman talk, url http://www-conf.slac.stanford.edu/tevpa09Ackermann090714v2.ppt Brian Fields Fermi Symposium Nov 4, 2009

  19. Theory vs Observation Preliminary Status ✓ shape: Galactic/pionic feature redshifted ✓ amplitude: substantial part of preliminary Fermi signal ✓ physics: probes cosmic star formation: source luminosity vs density evolution ✓ angular dist: ~isotropic, but should cluster like Curves: Pavlidou & BDF 02; Pavlidou, Prodanovic, & BDF in prep galaxies Ando & Pavlidou 09 Points: Ackerman talk, url http://www-conf.slac.stanford.edu/tevpa09Ackermann090714v2.ppt Brian Fields Fermi Symposium Nov 4, 2009

  20. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays Brian Fields Fermi Symposium Nov 4, 2009

  21. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays • Guaranteed and important diffuse Fermi signal! spectral feature: redshifted Galactic (pionic) peak signal amplitude: probes of cosmic star formation Brian Fields Fermi Symposium Nov 4, 2009

  22. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays • Guaranteed and important diffuse Fermi signal! spectral feature: redshifted Galactic (pionic) peak signal amplitude: probes of cosmic star formation • Fermi resolved star-forming galaxies will calibrate Milky Way diffuse, LMC, starbursts, M31? Brian Fields Fermi Symposium Nov 4, 2009

  23. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays • Guaranteed and important diffuse Fermi signal! spectral feature: redshifted Galactic (pionic) peak signal amplitude: probes of cosmic star formation • Fermi resolved star-forming galaxies will calibrate Milky Way diffuse, LMC, starbursts, M31? • star-forming gammas are “foreground” for other sources guaranteed: AGN; hoped-for: dark matter, structure-formation cosmic rays Brian Fields Fermi Symposium Nov 4, 2009

  24. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays • Guaranteed and important diffuse Fermi signal! spectral feature: redshifted Galactic (pionic) peak signal amplitude: probes of cosmic star formation • Fermi resolved star-forming galaxies will calibrate Milky Way diffuse, LMC, starbursts, M31? • star-forming gammas are “foreground” for other sources guaranteed: AGN; hoped-for: dark matter, structure-formation cosmic rays • cosmic-ray feedback on cosmology energy/pressure/ionization source, primordial lithium problem Brian Fields Fermi Symposium Nov 4, 2009

  25. Gamma Probes of Cosmic Star-Formation & Cosmic-Ray History star-forming galaxies SN cosmic rays gamma rays • Guaranteed and important diffuse Fermi signal! spectral feature: redshifted Galactic (pionic) peak signal amplitude: probes of cosmic star formation • Fermi resolved star-forming galaxies will calibrate Milky Way diffuse, LMC, starbursts, M31? • star-forming gammas are “foreground” for other sources guaranteed: AGN; hoped-for: dark matter, structure-formation cosmic rays • cosmic-ray feedback on cosmology energy/pressure/ionization source, primordial lithium problem • stay tuned! Brian Fields Fermi Symposium Nov 4, 2009

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