@article{0a4514dea23e4cb0a4ef8b45585cf5ae,
title = "H2O emission in high- z ultra-luminous infrared galaxies",
abstract = "Using the IRAM Plateau de Bure interferometer (PdBI), we report the detection of water vapor in six new lensed ultra-luminous starburst galaxies at high redshift, discovered in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). The sources are detected either in the 202-1 11 or 211-202 H2O emission lines with integrated line fluxes ranging from 1.8 to 14 Jy km s-1. The corresponding apparent luminosities are μLH2O ~ 3-12 × 108 L{\^a}{\v S}{\texttrademark}, where μ is the lensing magnification factor (3 < μ < 12). These results confirm that H 2O lines are among the strongest molecular lines in high-z ultra-luminous starburst galaxies, with intensities almost comparable to those of the high-J CO lines, and similar profiles and line widths (~200-900 km s -1). With the current sensitivity of the PdBI, the water lines can therefore easily be detected in high-z lensed galaxies (with F(500 μm) > 100 mJy) discovered in the Herschel surveys. Correcting the luminosities for amplification, using existing lensing models, LH2O is found to have a strong dependence on the infrared luminosity, varying as ~LIR 1.2. This relation, which needs to be confirmed with better statistics, may indicate a role of radiative (infrared) excitation of the H 2O lines, and implies that high-z galaxies with LIR ≥ 1013 L{\^a}{\v S}{\texttrademark} tend to be very strong emitters in water vapor, that have no equivalent in the local universe.",
keywords = "Galaxies: high-redshift, Galaxies: starburst, Infrared: galaxies, Radio lines: galaxies, Submillimeter: galaxies",
author = "A. Omont and C. Yang and P. Cox and R. Neri and A. Beelen and Bussmann, {R. S.} and R. Gavazzi and {Van Der Werf}, P. and D. Riechers and D. Downes and M. Krips and S. Dye and R. Ivison and Vieira, {J. D.} and A. Wei{\ss} and Aguirre, {J. E.} and M. Baes and Baker, {A. J.} and F. Bertoldi and A. Cooray and H. Dannerbauer and {De Zotti}, G. and Eales, {S. A.} and H. Fu and Y. Gao and M. Gu{\'e}lin and Harris, {A. I.} and M. Jarvis and M. Lehnert and L. Leeuw and R. Lupu and K. Menten and Micha{\l}owski, {M. J.} and M. Negrello and S. Serjeant and P. Temi and R. Auld and A. Dariush and L. Dunne and J. Fritz and R. Hopwood and C. Hoyos and E. Ibar and S. Maddox and Smith, {M. W.L.} and E. Valiante and J. Bock and Bradford, {C. M.} and J. Glenn and Scott, {K. S.}",
note = "Funding Information: Based on observations carried out with the IRAM Plateau de Bure interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). The authors are grateful to the IRAM staff for their support. US participants in H-ATLAS acknowledge support from NASA through a contract from JPL. Italian participants in H-ATLAS acknowledge a financial contribution from the agreement ASI-INAF I/009/10/0. SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including: Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). M. J. Micha{\l}owski acknowledges the support of a FWO-Pegasus Marie Curie Fellowship.",
year = "2013",
month = mar,
day = "5",
doi = "10.1051/0004-6361/201220811",
language = "English (US)",
volume = "551",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}