The Rest-frame Optical Colors of 99,000 SDSS Galaxies

Abstract

We synthesize the rest-frame Stroemgren colors using SDSS spectra for 99,088 galaxies selected from Data Release 1. This narrow-band ~200 AA photometric system (uz, vz, bz, yz), first designed for the determination of effective temperature, metallicity and gravity of stars, measures the continuum spectral slope of galaxies in the rest-frame 3200-5800 AA wavelength range. Galaxies form a remarkably narrow locus (~0.03 mag) in the resulting color-color diagram. The Bruzual & Charlot population synthesis models suggest that the position of a galaxy along this locus is controlled by a degenerate combination of metallicity and age of the dominant stellar population. Galaxy distribution along the locus is bimodal, with the local minimum corresponding to an ~1 Gyr old single stellar population. The position perpendicular to the locus is independent of metallicity and age, and reflects the galaxy's dust content, as implied by both the models and the statistics of IRAS detections. A comparison of this locus with the galaxy locus in the H_delta-D_n(4000) diagram, utilized by Kauffmann et al. (2003) to estimate stellar masses, reveals a tight correlation, although the two analyzed spectral ranges barely overlap. Overall, the galaxy spectral energy distribution in the entire UV to near-IR range can be described as a single-parameter family with an accuracy of 0.1 mag, or better. This nearly one-dimensional distribution of galaxies in the multi-dimensional space of measured parameters strongly supports the conclusion of Yip et al. (2004), based on a principal component analysis, that SDSS galaxy spectra can be described by a small number of eigenspectra. Apparently, the contributions of stellar populations that dominate the optical emission from galaxies are combined in a simple and well-defined way.

Accepted for publication in MNRAS; 19 pages, 28 color figures

References in corpus (39)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Stellar population synthesis at the resolution of 2003
• The Sloan Digital Sky Survey: Technical Summary
• The Global Schmidt Law in Star Forming Galaxies
• The Host Galaxies of AGN
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
• Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data
• Quantifying the bimodal color-magnitude distribution of galaxies
• The Dependence of Star Formation History and Internal Structure on Stellar Mass for 10^5 Low-Redshift Galaxies
• The Galaxy Luminosity Function and Luminosity Density at Redshift z=0.1
• The First Data Release of the Sloan Digital Sky Survey
• Present-Day Growth of Black Holes and Bulges: the SDSS Perspective
• The Broad-band Optical Properties of Galaxies with Redshifts 0.0 < z < 0.2
• The Luminosity Function of Galaxies in SDSS Commissioning Data
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• The Ensemble Photometric Variability of ~25000 Quasars in the Sloan Digital Sky Survey
• Star formation rate indicators in the Sloan Digital Sky Survey
• Early-type galaxies in the SDSS. III. The Fundamental Plane
• Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
• Statistical Properties of Bright Galaxies in the SDSS Photometric System
• Early-type galaxies in the SDSS. II. Correlations between observables
• Early-type galaxies in the SDSS. I. The sample
• Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
• The velocity dispersion function of early-type galaxies
• Aperture effects on Star Formation Rate, Metallicity and Reddening
• Early-type galaxies in the SDSS. IV. Colors and chemical evolution
• Active Galactic Nuclei in the Sloan Digital Sky Survey: II. Emission-Line Luminosity Function
• Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey
• A First Estimate of the Baryonic Mass Function of Galaxies
• The solar neighbourhood age-metallicity relation - does it exist?
• The SDSS Imaging Pipelines
• Average spectra of massive galaxies in the SDSS
• Candidate Type II Quasars from the Sloan Digital Sky Survey: II. From Radio to X-Rays
• The Ages of Dwarf Ellipticals
• The Color-Magnitude Relation in Coma: Clues to the Age and Metallicity of Cluster Populations
• Variability Studies with SDSS
• Multiwavelength View of SDSS Galaxies

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• X-ray properties of radio-selected star forming galaxies in the Chandra-COSMOS survey
• Identification of a Complete 160 micron Flux-Limited Sample of Infrared Galaxies in the ISO Lockman Hole 1-Deg^2 Deep Fields: Source Properties and Evidence for Strong Evolution in the FIR Luminosity Function for ULIRGs