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Observation of H_2O in a strongly lensed Herschel-ATLAS source at z = 2.3

Omont, A. and Murphy, E. J. and Riechers, D. and Vieira, J. D. and Bock, J. and Bradford, C. M. and Zmuidzinas, J. (2011) Observation of H_2O in a strongly lensed Herschel-ATLAS source at z = 2.3. Astronomy and Astrophysics, 530 . Art. No. L3. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20110613-083728464

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Abstract

The Herschel survey, H-ATLAS, with its large areal coverage, has recently discovered a number of bright, strongly lensed high-z submillimeter galaxies. The strong magnification makes it possible to study molecular species other than CO, which are otherwise difficult to observe in high-z galaxies. Among the lensed galaxies already identified by H-ATLAS, the source J090302.9-014127B (SDP.17b) at z = 2.305 is remarkable because of its excitation conditions and a tentative detection of the H_2O 2_(02)-1_(11) emission line (Lupu et al. 2010, ApJ, submitted). We report observations of this line in SDP.17b using the IRAM interferometer equipped with its new 277–371 GHz receivers. The H_2O line is detected at a redshift of z = 2.3049 ± 0.0006, with a flux of 7.8 ± 0.5 Jy km s^(-1) and a FWHM of 250 ± 60   km   s^(-1). The new flux is 2.4 times weaker than the previous tentative detection, although both remain marginally consistent within 1.6σ. The intrinsic line luminosity and ratio of H_2O(2_(02) − 1_(11))/CO(8 − 7) are comparable with those of the nearby starburst/enshrouded-AGN Mrk 231, and the ratio I(H_2O)/L_(FIR) is even higher, suggesting that SDP.17b could also host a luminous AGN. The detection of a strong H_2O 2_(02) − 1_(11) line in SDP.17b implies an efficient excitation mechanism of the water levels that must occur in very dense and warm interstellar gas probably similar to Mrk 231.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201116921DOIArticle
http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2011/06/aa16921-11/aa16921-11.htmlPublisherArticle
ORCID:
AuthorORCID
Murphy, E. J.0000-0001-7089-7325
Riechers, D.0000-0001-9585-1462
Additional Information:© 2011 ESO. Received 18 March 2011. Accepted 11 April 2011. Published online 28 April 2011. Herschel 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. The SPIRE development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA).We also thank the anonymous referee for very helpful suggestions.
Funders:
Funding AgencyGrant Number
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Max Planck GesellschaftUNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
NASA/JPLUNSPECIFIED
Agenzia Spaziale Italiana (ASI)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
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: starburst; galaxies: active; infrared: galaxies; submillimeter: galaxies; radio lines: galaxies
Record Number:CaltechAUTHORS:20110613-083728464
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110613-083728464
Official Citation:Observation of H2O in a strongly lensed Herschel-ATLAS source at z = 2.3 L3 A. Omont et al. Published online: 28 April 2011 DOI: 10.1051/0004-6361/201116921
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23980
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Jun 2011 16:11
Last Modified:21 Aug 2017 17:19

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