A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra)
  Luminous Infrared Galaxies

Magdis, G; Rigopoulou, D; Hopwood, R; Huang, J; Farrah, D; Pearson, C; Alonso-Herrero, A; Bock, J; Clements, D; Cooray, A; Griffin, M; Oliver, S; Fournon, P; Riechers, D; Swinyard, B; Scott, D; Thatte, N; Valtchanov, I; Vaccari, M

Journal article

A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies

Abstract:: We present Herschel far-IR photometry and spectroscopy as well as ground based CO observations of an intermediate redshift (0.21 < z < 0.88) sample of Herschel-selected (ultra)-luminous infrared galaxies (L_IR > 10^11.5L_sun). With these measurements we trace the dust continuum, far-IR atomic line emission, in particular [CII]\,157.7microns, as well as the molecular gas of z~0.3 (U)LIRGs and perform a detailed investigation of the interstellar medium of the population. We find that the majority of Herschel-selected intermediate redshift (U)LIRGs have L_CII/L_FIR ratios that are a factor of about 10 higher than that of local ULIRGs and comparable to that of local normal and high-$z$ star forming galaxies. Using our sample to bridge local and high-z [CII] observations, we find that the majority of galaxies at all redshifts and all luminosities follow a L_CII-L_FIR relation with a slope of unity, from which local ULIRGs and high-z AGN dominated sources are clear outliers. We also confirm that the strong anti-correlation between the L_CII/L_FIR ratio and the far-IR color L_60/L_100 observed in the local Universe holds over a broad range of redshifts and luminosities, in the sense that warmer sources exhibit lower L_CII/L_FIR at any epoch. Intermediate redshift ULIRGs are also characterised by large molecular gas reservoirs and by lower star formation efficiencies compared to that of local ULIRGs. The high L_CII/L_FIR ratios, the moderate star formation efficiencies (L_LIR/L_CO or L_IR/M_gas) and the relatively low dust temperatures of our sample (which are also common characteristics of high-z star forming galaxies with ULIRG-like luminosities) indicate that the evolution of the physical properties of (U)LIRGs between the present day and z > 1 is already significant by z ~ 0.3.

Publication status:: Published

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APA Style

Magdis, G., Rigopoulou, D., Hopwood, R., Huang, J., Farrah, D., Pearson, C., Alonso-Herrero, A., Bock, J., Clements, D., Cooray, A., Griffin, M., Oliver, S., Fournon, P., Riechers, D., Swinyard, B., Scott, D., Thatte, N., Valtchanov, I., & Vaccari, M. (2014). A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies. ASTROPHYSICAL JOURNAL, 796(1), 63–63.

MLA Style

Magdis, G, et al. “A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies.” ASTROPHYSICAL JOURNAL, vol. 796, no. 1, 2014, pp. 63–63.

Chicago Style

Magdis, G, D Rigopoulou, R Hopwood, et al. 2014. “A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies.” ASTROPHYSICAL JOURNAL 796 (1): 63–63.
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