| Autor: |
Rigopoulou, D., Hopwood, R., Magdis, G. E., Thatte, N., Swinyard, B. M., Farrah, D., Huang, J-S., Alonso-Herrero, A., Bock, J. J., Clements, D., Cooray, A., Griffin, M. J., Oliver, S., Pearson, C., Riechers, D., Scott, D., Smith, A., Vaccari, M., Valtchanov, I., Wang, L. |
| Rok vydání: |
2014 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1088/2041-8205/781/1/L15 |
| Popis: |
We report the first results from a spectroscopic survey of the [CII] 158um line from a sample of intermediate redshift (0.210^11.5 Lsun), using the SPIRE-Fourier Transform Spectrometer (FTS) on board the Herschel Space Observatory. This is the first survey of [CII] 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 [CII] 158um line emission from over 80% of the sample. We find that the [CII] line is luminous, in the range (0.8-4)x10^(-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[CII]/LIR ratio in our intermediate redshift (U)LIRGs is on average ~10 times larger than that of local ULIRGs. Furthermore, we find that the L[CII]/LIR and L[CII]/LCO(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 luminous infrared galaxies is likely to have occurred in the last 5 billion years.
Comment: Accepted for publication in ApJL, ApJ Volumne 781, L15 |
| Databáze: |
arXiv |
| Externí odkaz: |
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