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

Abstract

We present an enhanced version of the multiwavelength spectral modeling code MAGPHYS that allows the estimation of galaxy photometric redshift and physical properties (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 in MAGPHYS+photo-z is unique compared to standard photometric redshift codes. The broader wavelength consideration is particularly useful for breaking certain degeneracies in color vs. redshift for dusty galaxies with limited observer-frame ultraviolet and optical data (or upper limits). We demonstrate the success of the code in estimating redshifts and physical properties for over 4,000 infrared-detected galaxies at 0.4<z<6.0 in the COSMOS field with robust spectroscopic redshifts. We achieve high photo-z precision (${\sigma }_{\Delta z/(1+z_{spec})}\lesssim 0.04$), high accuracy (i.e., minimal offset biases; median$(\Delta z/(1+z_{spec}))\lesssim 0.02$), and low catastrophic failure rates ($\eta \simeq 4\%$) over all redshifts. Interestingly, we find that a weak 2175A absorption feature in the attenuation curve models is required 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-z decreases strongly as redshift uncertainty increases. The all-in-one treatment of uncertainties afforded with this code is beneficial for accurately interpreting physical properties of galaxies in large photometric datasets. Finally, we emphasize that MAGPHYS+photo-z is not intended to replace existing photo-z codes, but rather offer flexibility to robustly interpret physical properties when spectroscopic redshifts are unavailable. The MAGPHYS+photo-z code is publicly available online.

27 pages, 14 figures, 3 tables. Accepted for publication in ApJ. The MAGPHYS+photo-z code can be downloaded at http://www.iap.fr/magphys/download.html

References in corpus (92)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The physical properties of star forming galaxies in the low redshift universe
• Correcting for the Effects of Interstellar Extinction
• Interstellar Dust Grains
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
• The Cosmic Evolution Survey (COSMOS) -- Overview
• EAZY: A Fast, Public Photometric Redshift Code
• Stellar mass-to-light ratios and the Tully-Fisher relation
• A Simple Model for the Absorption of Starlight by Dust in Galaxies
• Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• CIGALE: a python Code Investigating GALaxy Emission
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• Bayesian photometric redshift estimation
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• Modeling the Panchromatic Spectral Energy Distributions of Galaxies
• Radio Properties of Infrared Selected Galaxies in the IRAS 2 Jy Sample
• The Infrared Spectral Energy Distribution of Normal Star-Forming Galaxies: Calibration at Far-Infrared and Submillimeter Wavelengths
• The Dust Opacity of Star-Forming Galaxies
• The First Release COSMOS Optical and Near-IR Data and Catalog
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Identifying Luminous AGN in Deep Surveys: Revised IRAC Selection Criteria
• Dust Attenuation Curves in the Local Universe: Demographics and New Laws for Star-forming Galaxies and High-redshift Analogs
• Resolved stellar mass maps of galaxies. I: method and implications for global mass estimates
• CANDELS Multi-wavelength Catalogs: Source Detection and Photometry in the GOODS-South Field
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• Deriving Physical Properties from Broadband Photometry with Prospector: Description of the Model and a Demonstration of its Accuracy Using 129 Galaxies in the Local Universe
• The Chandra COSMOS Legacy survey: overview and point source catalog
• Structure and Kinematics of Early-Type Galaxies from Integral-Field Spectroscopy
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• An updated analytic model for the attenuation by the intergalactic medium
• The Chandra COSMOS Survey, I: Overview and Point Source Catalog
• The MOSFIRE Deep Evolution Field (MOSDEF) Survey: Rest-Frame Optical Spectroscopy for ~1500 H-Selected Galaxies at 1.37 < z < 3.8
• Modelling and interpreting spectral energy distributions of galaxies with BEAGLE
• The Dust Attenuation Law in Distant Galaxies: Evidence for Variation with Spectral Type
• A Critical Assessment of Photometric Redshift Methods: A CANDELS Investigation
• Multiple Scattering in Clumpy Media. II. Galactic Environments
• The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
• Fitting the integrated Spectral Energy Distributions of Galaxies
• The Chandra COSMOS Legacy survey: optical/IR identifications
• CANDELS Multiwavelength catalogs: Source Identification and Photometry in the CANDELS UKIDSS Ultra-Deep Survey Field
• The XMM-Newton wide-field survey in the COSMOS field. The point-like X-ray source catalogue
• The XMM-Newton Wide-Field Survey in the COSMOS field (XMM-COSMOS): demography and multiwavelength properties of obscured and unobscured luminous AGN
• Measuring the Redshift Evolution of Clustering: the Hubble Deep Field South
• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• Dust in Starburst Galaxies
• Empirical determination of the shape of dust attenuation curves in star-forming galaxies
• Galaxy And Mass Assembly (GAMA): Spectroscopic analysis
• CANDELS Multiwavelength Catalogs: Source Identification and Photometry in the CANDELS Extended Groth Strip
• GOODS-Herschel:dust attenuation properties of UV selected high redshift galaxies
• "Super-deblended" Dust Emission in Galaxies: II. Far-IR to (sub)millimeter photometry and high redshift galaxy candidates in the full COSMOS field
• Photometric redshifts in the SWIRE Survey
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• The XMM-Newton wide-field survey in the COSMOS field: III. optical identification and multiwavelength properties of a large sample of X-ray selected sources
• Galaxy And Mass Assembly (GAMA): Accurate Panchromatic Photometry from Optical Priors using LAMBDAR
• "Super-deblended" Dust Emission in Galaxies: I. The GOODS-North Catalog and the Cosmic Star Formation Rate Density out to Redshift 6
• Photometric redshifts from evolutionary synthesis with PEGASE: the code ZPEG and the z=0 age constraint
• CANDELS Multiwavelength Catalogs: Source Identification and Photometry in the CANDELS COSMOS Survey Field
• Breaking the Curve with CANDELS: A Bayesian Approach to Reveal the Non-Universality of the Dust-Attenuation Law at High Redshift
• The Flux Ratio Method for Determining the Dust Attenuation of Starburst Galaxies
• Galaxy and Mass Assembly (GAMA): Optimal Tiling of Dense Surveys with a Multi-Object Spectrograph
• The VANDELS ESO public spectroscopic survey: observations and first data release
• Galaxy And Mass Assembly (GAMA): The input catalogue and star-galaxy separation
• The VANDELS ESO public spectroscopic survey
• The VIMOS Ultra Deep Survey First Data Release: spectra and spectroscopic redshifts of 698 objects up to z~6 in CANDELS
• GMASS ultradeep spectroscopy of galaxies at z ~ 2. IV. The variety of dust populations
• Comprehensive comparison of models for spectral energy distributions from 0.1 micron to 1 mm of nearby star-forming galaxies
• $\Lambda$CDM Cosmology for Astronomers
• On the importance of using appropriate spectral models to derive physical properties of galaxies at 0.7<z<2.8
• Dust Attenuation in High Redshift Galaxies -- 'Diamonds in the Sky'
• Radiative Transfer Model of Dust Attenuation Curves in Clumpy, Galactic Environments
• A systematic search for very massive galaxies at z > 4
• The evolving relation between star-formation rate and stellar mass in the VIDEO Survey since $z=3$
• Galaxy And Mass Assembly (GAMA): Curation and reanalysis of 16.6k redshifts in the G10/COSMOS region
• Infrared Selection of Obscured Active Galactic Nuclei in the COSMOS Field
• BayeSED: A General Approach to Fitting the Spectral Energy Distribution of Galaxies
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• Characterizing Dust Attenuation in Local Star Forming Galaxies: Inclination Effects and the 2175Å Feature
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• Panchromatic SED modelling of spatially-resolved galaxies
• The MUSE Hubble Ultra Deep Field Survey: III. Testing photometric redshifts to 30th magnitude
• The redshift distribution of submillimetre galaxies at different wavelengths

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• COSMOS2020: Manifold Learning to Estimate Physical Parameters in Large Galaxy Surveys
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• VLA Legacy Survey of Molecular Gas in Massive Star-forming Galaxies at High Redshift
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• Spitzer catalog of Herschel-selected ultrared dusty, star-forming galaxies
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• COLDz: Deep 34 GHz Continuum Observations and Free-free Emission in High-redshift Star-forming Galaxies
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• 2mm Observations and the Search for High-Redshift Dusty Star-forming Galaxies
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• Modeling submillimeter galaxies in cosmological simulations: Contribution to the cosmic star formation density and predictions for future surveys
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• Evolution of the infrared luminosity function and its corresponding dust-obscured star formation rate density out to z~6
• WISE J044232.92+322734.9: A star-forming galaxy at redshift 1.1 seen through a Galactic dust clump?
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