Radio source stacking and the infrared / radio correlation at microJy flux densities

Abstract

We investigate the infrared / radio correlation using the technique of source stacking, in order to probe the average properties of radio sources that are too faint to be detected individually. We compare the two methods used in the literature to stack sources, and demonstrate that the creation of stacked images leads to a loss of information. We stack infrared sources in the Spitzer extragalactic First Look Survey (xFLS) field, and the three northern Spitzer Wide-area Infrared Extragalactic survey (SWIRE) fields, using radio surveys created at 610 MHz and 1.4 GHz, and find a variation in the absolute strength of the correlation between the xFLS and SWIRE regions, but no evidence for significant evolution in the correlation over the 24-um flux density range 150 uJy - 2 mJy. We carry out the first radio source stacking experiment using 70-um-selected galaxies, and find no evidence for significant evolution over the 70-um flux density range 10 mJy - 100 mJy.

11 pages, 12 figures. Accepted for publication in MNRAS

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• Degree of Polarization and Source Counts of Faint Radio Sources from Stacking Polarized Intensity
• An insight into the extragalactic transient and variable microJy radio sky across multiple decades
• Exploring the Connection between UV/Optical Variations and Radio Emission in Radio-Quiet Quasars: Clues on Radio Emission Origin
• Measuring Structural Parameters Through Stacking Galaxy Images
• What is the origin of the stacked radio emission in radio-undetected quasars?: Insights from a radio-infrared image stacking analysis
• Star formation history of $0.1\le \text{z}\le 1.5$ mass-selected galaxies in the ELAIS-N1 Field
• Properties of Compact Faint Radio Sources as a Function of Angular Size from Stacking