Spatial Clustering from GALEX-SDSS samples: Star Formation History and large-scale clustering

Abstract

We measure the projected spatial correlation function w_p(r_p) from a large sample combining GALEX ultraviolet imaging with the SDSS spectroscopic sample. We study the dependence of the clustering strength for samples selected on (NUV - r)_abs color, specific star formation rate (SSFR), and stellar mass. We find that there is a smooth transition in the clustering of galaxies as a function of this color from weak clustering among blue galaxies to stronger clustering for red galaxies. The clustering of galaxies within the "green valley" has an intermediate strength, and is consistent with that expected from galaxy groups. The results are robust to the correction for dust extinction. The comparison with simple analytical modeling suggests that the halo occupation number increases with older star formation epochs. When splitting according to SSFR, we find that the SSFR is a more sensitive tracer of environment than stellar mass.

Accepted for publication in ApJ; 14 pages, 17 figures, 4 tables

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• Broadband Intensity Tomography: Spectral Tagging of the Cosmic UV Background
• Effects on Galaxy Evolution: Pair Interactions versus Environment
• Intensity Mapping Cross-Correlations: Connecting the Largest Scales to Galaxy Evolution
• Halo Occupation Distribution Modeling of Green Valley Galaxies
• The UV-Optical Color Dependence of Galaxy Clustering in the Local Universe
• Main Sequence Scatter is Real: The Joint Dependence of Galaxy Clustering on Star Formation and Stellar Mass
• Deep GALEX Observations of the Coma Cluster: Source Catalog and Galaxy Counts
• Which halos host Herschel-ATLAS galaxies in the local Universe?
• Single parameter galaxy classification: The Principal Curve through the multi-dimensional space of galaxy properties
• Clustering of the AKARI NEP Deep Field 24 $\mu$m selected galaxies
• Linking galaxies to dark matter haloes at $z\sim 1$ : dependence of galaxy clustering on stellar mass and specific star formation rate
• A study on the Clustering Properties of Radio-Selected sources in the Lockman Hole Region at 325 MHz
• Color dependence of clustering of massive galaxies at 0.5$\le z\le$2.5: similar spatial distributions between green valley galaxies and AGNs
• Galaxy And Mass Assembly (GAMA): the signatures of galaxy interactions as viewed from small scale galaxy clustering
• Star-forming and Quiescent Central Galaxies Cluster Similarly: Implications for the Galaxy-Halo Connection