2009/06/09 by N. Seymour, Minh Huynh, M. Huynh +9 · 1 citation
Physics and Astronomy · #Active galactic nucleus #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Star Formation Studies #Chandra Deep Field South #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble Deep Field #Luminosity #Photometric redshift #Physics #Radio galaxy #Redshift #Star formation #astro-ph.CO
paper · pdf · doi:10.1111/j.1365-2966.2009.15224.x
10 pages, 4 figures, accepted for publication in MNRAS
arxiv created 2009/06/09 · openalex publication_date 2009/08/10 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In order to examine the far-IR/radio correlation at high redshift we have studied the Spitzer 70um/far-infrared (far-IR) properties of sub-mJy radio sources from the 13H XMM-Newton/Chandra Deep Field by redshift and galaxy type: active galactic nucleus (AGN) or star forming galaxy (SFG). We directly detect 70um counterparts (at >3sigma significance) for 22.5% (92/408) of the radio sources, while for the rest we perform stacking analysis by redshift and galaxy type. For the sources detected at 70um we find that the median and scatter of the observed flux density ratio, q70, are similar to previous results in the literature, but with a slight decrease in q70 towards higher redshifts. Of the radio sources detected at 70um 8/92 were already classified as AGN, but two of which maybe SFGs. For the stacked sources we obtain a detection for the SFGs at every redshift bin which implies they have mean flux densities a factor ~5 below the original 70um detection limit. For the stacked AGN we obtain a detection only in our highest redshift bin (1