Photometric Redshifts of Submillimeter Galaxies

Abstract

We use the photometric redshift method of Chakrabarti & McKee (2008) to infer photometric redshifts of submillimeter galaxies with far-IR (FIR) $Herschel$ data obtained as part of the PACS Evolutionary Probe (PEP) program. For the sample with spectroscopic redshifts, we demonstrate the validity of this method over a large range of redshifts ($ 4 \ga z \ga 0.3$) and luminosities, finding an average accuracy in $(1+z_{\mathrm{phot}})/(1+z_{\mathrm{spec}})$ of 10%. Thus, this method is more accurate than other FIR photometric redshift methods. This method is different from typical FIR photometric methods in deriving redshifts from the light-to-gas mass ($L/M$) ratio of infrared-bright galaxies inferred from the FIR spectral energy distribution (SED), rather than dust temperatures. Once the redshift is derived, we can determine physical properties of infrared bright galaxies, including the temperature variation within the dust envelope, luminosity, mass, and surface density. We use data from the GOODS-S field to calculate the star formation rate density (SFRD) of sub-mm bright sources detected by AzTEC and PACS. The AzTEC-PACS sources, which have a threshold $850 \micron$ flux $\ga 5 \rm mJy$, contribute 15% of the SFRD from all ULIRGs ($L_{\rm IR} \ga 10^{12} L_{\odot}$), and 3% of the total SFRD at $z\sim 2$.

7 pages, 2 figures, submitted to ApJ

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• A Submillimeter Perspective on the GOODS Fields (SUPER GOODS) - I. An Ultradeep SCUBA-2 Survey of the GOODS-N
• z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [I] Overview
• Serendipitous detection of an overdensity of Herschel-SPIRE 250 micron sources south of MRC1138-26
• The impact of carbon and oxygen abundances on the metal-poor initial mass function
• When did the initial mass function become bottom-heavy?
• Improving Optical Photo-z Constraints for Dusty Star-forming Galaxies Using Submillimeter-based Priors