期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 410, 期 2, 页码 1155-1173出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17517.x
关键词
galaxies: evolution; galaxies: high-redshift; galaxies: ISM; infrared: galaxies; radio continuum: galaxies
资金
- Institute of Physics
- Royal Astronomical Society
- Science and Technology Facilities Council [ST/F00298X/1, ST/G001871/1] Funding Source: researchfish
- STFC [ST/F00298X/1, ST/G001871/1, ST/F007043/1] Funding Source: UKRI
We investigate the far-infrared-radio correlation (FRC) of stellar-mass-selected galaxies in the Extended Chandra Deep Field-South using far-infrared (FIR) imaging from Spitzer and radio imaging from the Very Large Array and Giant Metre-Wave Radio Telescope. We stack in redshift bins to probe galaxies below the noise and confusion limits. Radio fluxes are K-corrected using observed flux ratios, leading to tentative evidence for an evolution in spectral index. We compare spectral energy distribution (SED) templates of local galaxies for K-correcting FIR fluxes and show that the data are best fitted by a quiescent spiral template (M51) rather than a warm starburst (M82) or ultra-luminous infrared galaxy (Arp 220), implying a predominance of cold dust in massive galaxies at high redshift. In contrast, we measure total infrared luminosities that are consistent with high star-formation rates. We observe that the FRC index (q) does not evolve significantly over z = 0-2 when computed from K-corrected 24- or 160-mu m photometry, but that using 70-mu m fluxes leads to an apparent decline in q beyond z similar to 1. This suggests some change in the SED at high redshift, either a steepening of the spectrum at rest-frame similar to 25-35 mu m or a deficiency at similar to 70 mu m leading to a drop in the total infrared-radio ratios. We compare our results to other work in the literature and find synergies with recent findings on the high-redshift FRC, high specific star formation rates of massive galaxies and the cold dust temperatures in these galaxies.
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