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Differential Extinction Corrections: Implications for the Cosmic Star Formation History

Differential Extinction Corrections: Implications for the Cosmic Star Formation History. Naveen Reddy (NOAO/Caltech) Chuck Steidel, Alice Shapley, Max Pettini, Dawn Erb, Kurt Adelberger Massive Galaxies over Cosmic Time , Tucson, AZ, November 02, 2006. Background. Bouwens & Illingworth (2006).

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Differential Extinction Corrections: Implications for the Cosmic Star Formation History

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  1. Differential Extinction Corrections: Implications for the Cosmic Star Formation History Naveen Reddy (NOAO/Caltech) Chuck Steidel, Alice Shapley, Max Pettini, Dawn Erb, Kurt AdelbergerMassive Galaxies over Cosmic Time, Tucson, AZ, November 02, 2006

  2. Background Bouwens & Illingworth (2006) Two ingredients for determining star formation and buildup of stellar mass in the universe: Census of Star-forming Galaxies (b) Extinction Corrections

  3. Maximum Likelihood Method Systematic effects: Photometric Scatter, Ly perturbations Constrain E(B-V) distribution to get LF

  4. Rest-Frame UV Luminosity Function at z~2-4 Z=2.2

  5. Measuring Infrared Luminosities with Spitzer Accurately constrain infrared luminosities of redshift 1.5<z<2.6 galaxies   Rest-frame UV spectroscopy  very accurate redshifts+ photo-z’s for near-IR selected galaxies MIPS 24 micron fluxes  individual detections for L* galaxies at z~2 MIPS vs. H

  6. Z>>2? Increasing dust-to-gas ratio with age Relationship between Obscuration and L(bol)

  7. Implications… Evolution in average dust attenuation 

  8. Implications for the Cosmic SFRD… Evolution in average dust attenuation  Fan et al. 2001 After extinction correction? Larger extinction Smaller extinction

  9. Conclusions • Local extinction laws apply to most high redshift galaxies (X-ray, radio, dust-corrected UV, MIPS); typical galaxies at z~2 are LIRGs • Strong correlation between bolometric luminosity and dust obscuration, but z~2 galaxies are factor of ~10 less obscured that local galaxies of a given L(bol) • Specific SFRs indicate wide range in evolutionary state of z~2 galaxies • Differential attenuation as function of redshift has implications for slope of extinction-corrected Madau diagram at high z • Systematics important in constraining SFRD • Extinction correction as function of z to fixed value of L*(bol) • Extinction correction at sub-L* luminosities • SFRD to same rest-frame optical luminosity limit as stellar mass density studies

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