Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 2015 | Submitted + Published
Journal Article Open

The far-infrared/radio correlation and radio spectral index of galaxies in the SFR–M_∗ plane up to z ∼ 2


We study the evolution of the radio spectral index and far-infrared/radio correlation (FRC) across the star-formation rate – stellar masse (i.e. SFR–M_∗) plane up to z ~ 2. We start from a stellar-mass-selected sample of galaxies with reliable SFR and redshift estimates. We then grid the SFR–M_∗ plane in several redshift ranges and measure the infrared luminosity, radio luminosity, radio spectral index, and ultimately the FRC index (i.e. q_(FIR)) of each SFR–M_∗–z bin. The infrared luminosities of our SFR–M_∗–z bins are estimated using their stacked far-infrared flux densities inferred from observations obtained with the Herschel Space Observatory. Their radio luminosities and radio spectral indices (i.e. α, where S_ν ∝ ν^(−α)) are estimated using their stacked 1.4 GHz and 610 MHz flux densities from the Very Large Array and Giant Metre-wave Radio Telescope, respectively. Our far-infrared and radio observations include the most widely studied blank extragalactic fields – GOODS-N, GOODS-S, ECDFS, and COSMOS – covering a total sky area of ~2.0 deg^2. Using this methodology, we constrain the radio spectral index and FRC index of star-forming galaxies with M_∗ > 10^(10) M_⊙ and 0

Additional Information

© 2014 ESO. Received: 6 September 2014. Accepted: 21 October 2014. Published online 15 December 2014. We thank the anonymous referee for suggestions which greatly enhanced this work. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAF-IFSI/OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada), NAOC (China), CEA, LAM (France), IFSI, University of Padua (Italy), IAC (Spain), Stockholm Observatory (Sweden), Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK), Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). Support for BM was provided by the DFG priority programme 1573 The physics of the interstellar medium. R.J.I. acknowledges support from the European Research Council in the form of Advanced Grant, cosmicism. E.I. acknowledges funding from CONICYT/FONDECYT postdoctoral project N◦:3130504. F.B. and A.K. acknowledge support by the Collaborative Research Council 956, sub-project A1, funded by the Deutsche Forschungsgemeinschaft (DFG).

Attached Files

Published - aa24937-14.pdf

Submitted - 1410.7412v1.pdf


Files (2.8 MB)
Name Size Download all
1.7 MB Preview Download
1.1 MB Preview Download

Additional details

August 20, 2023
October 20, 2023