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We present an enhanced version of the multiwavelength spectral modeling codeMAGPHYS that allows the estimation of galaxy photometric redshift and physicalproperties (e.g., stellar mass, star formation rate, dust attenuation)simultaneously, together with robust characterization of their uncertainties.The self-consistent modeling over ultraviolet to radio wavelengths inMAGPHYS+photo-z is unique compared to standard photometric redshift codes. Thebroader wavelength consideration is particularly useful for breaking certaindegeneracies in color vs. redshift for dusty galaxies with limitedobserver-frame ultraviolet and optical data (or upper limits). We demonstratethe success of the code in estimating redshifts and physical properties forover 4,000 infrared-detected galaxies at 0.4<z<6.0 in the COSMOS field withrobust spectroscopic redshifts. We achieve high photo-z precision($\sigma_{\Delta z/(1+z_{spec})}\lesssim0.04$), high accuracy (i.e., minimaloffset biases; median$(\Delta z/(1+z_{spec}))\lesssim0.02$), and lowcatastrophic failure rates ($\eta\simeq4\%$) over all redshifts. Interestingly,we find that a weak 2175A absorption feature in the attenuation curve models isrequired to remove a subtle systematic photo-z offset($z_{phot}-z_{spec}\simeq-0.03$) that occurs when this feature is not included.As expected, the accuracy of derived physical properties in MAGPHYS+photo-zdecreases strongly as redshift uncertainty increases. The all-in-one treatmentof uncertainties afforded with this code is beneficial for accuratelyinterpreting physical properties of galaxies in large photometric datasets.Finally, we emphasize that MAGPHYS+photo-z is not intended to replace existingphoto-z codes, but rather offer flexibility to robustly interpret physicalproperties when spectroscopic redshifts are unavailable. The MAGPHYS+photo-zcode is publicly available online.

MAGPHYS+photo-z: Constraining the Physical Properties of Galaxies with Unknown Redshifts