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Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai

Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai. T. Soifer, C. Bian, L. Armus, H. Teplitz (Pasadena) A. Dey, B. Jannuzi, E. Le Floc’h, K. Brand (Tucson) D. Weedman, S. Higdon, J. Higdon, J. Houck (Ithaca) IRS, IRAC, MIPS Instrument Teams.

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Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai

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  1. Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes fieldVandana Desai T. Soifer, C. Bian, L. Armus, H. Teplitz (Pasadena) A. Dey, B. Jannuzi, E. Le Floc’h, K. Brand (Tucson) D. Weedman, S. Higdon, J. Higdon, J. Houck (Ithaca) IRS, IRAC, MIPS Instrument Teams

  2. What is the role of infrared sources in galaxy evolution? Stars,AGN Dust  (nW m-2 sr-1) Elbaz et al. 2002 Wavelength (microns)

  3. IR galaxies are not significant today, but they were in the past Euclid Norm # Counts 24 micron flux (mJy) Papovich et al. 2004

  4. Optical Spectroscopic Survey Flux limit = 0.3 mJy Area = 0.33 deg2 Targeting completeness = 60% (548 targets) Redshift completeness = 70% NDWFS Bootes 4 deg

  5. Space density as a function of LIR and redshift Also see Le Floch et al. 2005, Perez-Gonzalez et al. 2005; Caputi et al. 2006

  6. What are the sources without redshifts? Number LIRGs at z = 1 ULIRGs at z > 1.5 Redshift

  7. Redshift Sources with redshfts Number Sources without redshfts R-[24] (mag)

  8. “Extreme” sources R-[24] color distribution for Bootes MIPS sources Fraction Most extreme 10% R-[24] (Vega mag)

  9. ≈0.3 mJy Papovich et al. 2004 increasingly significant numbers at fainter fluxes... Euclid Norm # Counts Extreme Fraction 24 micron flux (mJy) 24 micron flux (mJy) ...where we find the peak of the 24m counts!

  10. SEDs of Extreme Sources Bump sources = SF-dominated? Zphot (bumps)= 1 - 2.5 Dey, Desai et al. in prep Bump Fraction 24 micron flux (mJy)

  11. IRS results on extreme sources 1. IRS GTO Team: 58 sources with fn(24) > 0.8 mJy z~2; Few PAH-dominated sources Yan et al. GO1: 52 sources with fn(24) > 1 mJy AND R(24:8) > 0.5 z~2; 1/3 PAH-dominated sources The brightest 24 micron sources tend to be AGN-dominated

  12. What about the PAH-rich sources at z~2? fn(24)=0.5-0.75 mJy ULIRGs Far-IR SED: 70,160,350 micron observations pending How well can we convert 24 micron flux to LIR at z=2?

  13. Lots more data on this active phase coming down the pipe! • Lin Yan’s GO2 and GO3 IRS spectra • GO2: Flux-limited > 1 mJy • GO3: z=1 and z=2 faint samples • Jiasheng Huang’s z=3 sample

  14. IR galaxies are not significant today, but they were in the past WIR (Lsun Mpc-3) Redshift Le Floch et al. 2005

  15. Are extreme sources are off the chart? R-[24] (Vega mag) Redshift

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