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H_2O emission in high-z ultra-luminous infrared galaxies

Omont, A. and Riechers, D. and Vieira, J. D. and Bock, J. and Bradford, C. M. (2013) H_2O emission in high-z ultra-luminous infrared galaxies. Astronomy and Astrophysics, 551 . Art. No. A115. ISSN 0004-6361. doi:10.1051/0004-6361/201220811.

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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 2_(02)−1_(11) or 2_(11)−2_(02) H_2O emission lines with integrated line fluxes ranging from 1.8 to 14 Jy km s^(-1). The corresponding apparent luminosities are μL_(H2O) ~ 3−12 × 10^8 L_⊙, 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, L_(H2O) is found to have a strong dependence on the infrared luminosity, varying as ~L_(IR)^(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 L_(IR) ≳ 10^(13) L_⊙ tend to be very strong emitters in water vapor, that have no equivalent in the local universe.

Item Type:Article
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URLURL TypeDescription
Omont, A.0000-0002-4721-3922
Riechers, D.0000-0001-9585-1462
Bock, J.0000-0002-5710-5212
Bradford, C. M.0000-0001-5261-7094
Additional Information:© 2013 ESO. Article published by EDP Sciences. Received 28 November 2012. Accepted 7 January 2013. Published online 05 March 2013. Herschel (Pilbratt et al. 2010) is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. 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. Michałowski acknowledges the support of a FWO-Pegasus Marie Curie Fellowship.
Funding AgencyGrant Number
Istituto Nazionale di Astrofisica (INAF)I/009/10/0
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: starburst; infrared: galaxies; submillimeter: galaxies; radio lines: galaxies
Record Number:CaltechAUTHORS:20130507-093655427
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Official Citation:H2O emission in high-z ultra-luminous infrared galaxies A115 A. Omont, C. Yang, P. Cox, R. Neri, A. Beelen, R. S. Bussmann, R. Gavazzi, P. van der Werf, D. Riechers, D. Downes, et al. (40 more) Published online: 5 March 2013 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38314
Deposited By: Ruth Sustaita
Deposited On:07 May 2013 17:01
Last Modified:09 Nov 2021 23:36

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