Herschel Observations of Far-infrared Cooling Lines in Intermediate Redshift (Ultra)-luminous Infrared Galaxies

We report the first results from a spectroscopic survey of the [C II] 158 μm line from a sample of intermediate redshift (0.2 <z < 0.8) (ultra)-luminous infrared galaxies, (U)LIRGs (L IR > 1011.5 L ☉), using the Spectral and Photometric Imaging REceiver-Fourier Transform Spectrometer on boa...

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Detalhes bibliográficos
Autores: Rigopoulou, Dimitra, Hopwood, Ros H. B., Magdis, Georgios E., Thatte, N., Swinyard, B. M., Farrah, Duncan, Huang, Jiasheng, Alonso Herrero, Almudena, Bock, Jamie, Clements, David L., Cooray, Asantha R., Griffin, M. J., Oliver, Seb, Pearson, C., Riechers, D., Scott, Douglas, Smith, A., Vaccari, Mattia, Valtchanov, Ivan, Wang, L.
Formato: artículo
Fecha de publicación:2014
País:España
Recursos:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/4805
Acesso em linha:http://hdl.handle.net/10902/4805
Access Level:acceso abierto
Palavra-chave:Galaxies: Starburst
Infrared: Galaxies
Infrared: ISM
Descrição
Resumo:We report the first results from a spectroscopic survey of the [C II] 158 μm line from a sample of intermediate redshift (0.2 <z < 0.8) (ultra)-luminous infrared galaxies, (U)LIRGs (L IR > 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.

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