The far-infrared/radio correlation as probed by Herschel*

نویسندگان

  • R. J. Ivison
  • A. Blain
  • J. Bock
  • A. Bongiovanni
  • A. Boselli
  • V. Buat
  • D. Burgarella
  • N. Castro-Rodríguez
  • H. Dominguez
  • C. D. Dowell
  • R. Maiolino
  • L. Marchetti
  • G. E. Morrison
  • A. M. J. Mortier
  • H. T. Nguyen
  • S. J. Oliver
  • A. Omont
  • F. N. Owen
  • M. J. Page
  • P. Panuzzo
  • A. Papageorgiou
  • C. P. Pearson
  • I. Pérez-Fournon
  • A. M. Pérez García
  • F. Pozzi
  • J. I. Rawlings
  • G. Raymond
  • D. Rigopoulou
  • L. Shao
  • D. L. Shupe
  • A. J. Smith
  • J. A. Stevens
چکیده

We set out to determine the ratio, qIR, of rest-frame 8–1000-μm flux, S IR, to monochromatic radio flux, S 1.4 GHz, for galaxies selected at far-infrared (IR) and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, Td, and to identify any farIR-bright outliers – useful laboratories for exploring why the far-IR/radio correlation (FIRRC) is generally so tight when the prevailing theory suggests variations are almost inevitable. We use flux-limited 250-μm and 1.4-GHz samples, obtained using Herschel and the Very Large Array (VLA) in GOODS-North (-N). We determine bolometric IR output using ten bands spanning λobs = 24−1250 μm, exploiting data from PACS and SPIRE (PEP; HerMES), as well as Spitzer, SCUBA, AzTEC and MAMBO. We also explore the properties of an LIR-matched sample, designed to reveal evolution of qIR with redshift, spanning log LIR = 11–12 L and z = 0−2, by stacking into the radio and far-IR images. For 1.4-GHz-selected galaxies in GOODS-N, we see tentative evidence of a break in the flux ratio, qIR, at L1.4 GHz ∼ 1022.7 W Hz−1, where active galactic nuclei (AGN) are starting to dominate the radio power density, and of weaker correlations with redshift and Td. From our 250-μm-selected sample we identify a small number of far-IR-bright outliers, and see trends of qIR with L1.4 GHz, LIR, Td and redshift, noting that some of these are inter-related. For our LIR-matched sample, there is no evidence that qIR changes significantly as we move back into the epoch of galaxy formation: we find qIR ∝ (1+ z), where γ = −0.04± 0.03 at z = 0− 2; however, discounting the least reliable data at z < 0.5 we find γ = −0.26± 0.07, modest evolution which may be related to the radio background seen by ARCADE 2, perhaps driven by <10-μJy radio activity amongst ordinary star-forming galaxies at z > 1.

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تاریخ انتشار 2010