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Herschel observations of far-infrared cooling lines in intermediate redshift (ultra)-luminous infrared galaxies

  • Author(s): Rigopoulou, D
  • Hopwood, R
  • Magdis, GE
  • Thatte, N
  • Swinyard, BM
  • Farrah, D
  • Huang, JS
  • Alonso-Herrero, A
  • Bock, JJ
  • Clements, D
  • Cooray, A
  • Griffin, MJ
  • Oliver, S
  • Pearson, C
  • Riechers, D
  • Scott, D
  • Smith, A
  • Vaccari, M
  • Valtchanov, I
  • Wang, L
  • et al.
Abstract

We report the first results from a spectroscopic survey of the [C II] 158 μm line from a sample of intermediate redshift (0.2 1011.5 L ), using the Spectral and Photometric Imaging REceiver-Fourier Transform Spectrometer on board the Herschel Space Observatory. This is the first survey of [C II] emission, an important tracer of star formation, at a redshift range where the star formation rate density of the universe increases rapidly. We detect strong [C II] 158 μm line emission from over 80% of the sample. We find that the [C II] line is luminous, in the range (0.8-4) × 10 -3 of the far-infrared continuum luminosity of our sources, and appears to arise from photodissociation regions on the surface of molecular clouds. The L [C II]/L IR ratio in our intermediate redshift (U)LIRGs is on average 10 times larger than that of local ULIRGs. Furthermore, we find that the L [C II]/L IR and L [C II]/L CO(1-0) ratios in our sample are similar to those of local normal galaxies and high-z star-forming galaxies. ULIRGs at z 0.5 show many similarities to the properties of local normal and high-z star-forming galaxies. Our findings strongly suggest that rapid evolution in the properties of the star-forming regions of (U)LIRGs is likely to have occurred in the last 5 billion years. © 2014. The American Astronomical Society. All rights reserved.

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