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Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3

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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 H2O 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 H2O 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 1.6 sigma. The intrinsic line luminosity and ratio of H2O(2(02)-1(11))/CO(8-7) are comparable with those of the nearby starburst/enshrouded-AGN Mrk 231, and the ratio I(H2O)/L-FIR is even higher, suggesting that SDP.17b could also host a luminous AGN. The detection of a strong H2O 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.
Keywords
infrared: galaxies, galaxies: active, galaxies: starburst, galaxies: high-redshift, submillimeter: galaxies, radio lines: galaxies, MOLECULAR GAS EXCITATION, STAR-FORMING GALAXIES, HIGH-REDSHIFT, INTERSTELLAR-MEDIUM, CLOVERLEAF QUASAR, MARKARIAN 231, INFRARED GALAXIES, APM 08279+5255, WATER, EMISSION

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Chicago
Omont, A, R Neri, P Cox, R Lupu, M Guélin, P van der Werf, A Weiß, et al. 2011. “Observation of H2O in a Strongly Lensed Herschel-ATLAS Source at Z=2.3.” Astronomy & Astrophysics 530.
APA
Omont, A., Neri, R., Cox, P., Lupu, R., Guélin, M., van der Werf, P., Weiß, A., et al. (2011). Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3. ASTRONOMY & ASTROPHYSICS, 530.
Vancouver
1.
Omont A, Neri R, Cox P, Lupu R, Guélin M, van der Werf P, et al. Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3. ASTRONOMY & ASTROPHYSICS. 2011;530.
MLA
Omont, A, R Neri, P Cox, et al. “Observation of H2O in a Strongly Lensed Herschel-ATLAS Source at Z=2.3.” ASTRONOMY & ASTROPHYSICS 530 (2011): n. pag. Print.
@article{2114146,
  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 H2O 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 H2O 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 1.6 sigma. The intrinsic line luminosity and ratio of H2O(2(02)-1(11))/CO(8-7) are comparable with those of the nearby starburst/enshrouded-AGN Mrk 231, and the ratio I(H2O)/L-FIR is even higher, suggesting that SDP.17b could also host a luminous AGN. The detection of a strong H2O 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.},
  articleno    = {L3},
  author       = {Omont, A and Neri, R and Cox, P and Lupu, R and Gu{\'e}lin, M and van der Werf, P and Wei{\ss}, A and Ivison, R and Negrello, M and Leeuw, L and Lehnert, M and Smail, I and Verma, A and Baker, AJ and Beelen, A and Aguirre, JE and Baes, Maarten and Bertoldi, F and Clements, DL and Cooray, A and Coppin, K and Dannerbauer, H and De Zotti, G and Dye, S and Fiolet, N and Frayer, D and Gavazzi, R and Hughes, D and Jarvis, M and Krips, M and Micha\unmatched{0142}owski, MJ and Murphy, EJ and Riechers, D and Serjeant, S and Swinbank, AM and Temi, P and Vaccari, M and Vieira, JD and Auld, R and Buttiglione, B and Cava, A and Dariush, A and Dunne, L and Eales, SA and Fritz, Jacopo and Gomez, H and Ibar, E and Maddox, S and Pascale, E and Pohlen, M and Rigby, E and Smith, DJB and Bock, J and Bradford, CM and Glenn, J and Scott, KS and Zmuidzinas, J},
  issn         = {0004-6361},
  journal      = {ASTRONOMY \& ASTROPHYSICS},
  keyword      = {infrared: galaxies,galaxies: active,galaxies: starburst,galaxies: high-redshift,submillimeter: galaxies,radio lines: galaxies,MOLECULAR GAS EXCITATION,STAR-FORMING GALAXIES,HIGH-REDSHIFT,INTERSTELLAR-MEDIUM,CLOVERLEAF QUASAR,MARKARIAN 231,INFRARED GALAXIES,APM 08279+5255,WATER,EMISSION},
  language     = {eng},
  pages        = {5},
  title        = {Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3},
  url          = {http://dx.doi.org/10.1051/0004-6361/201116921},
  volume       = {530},
  year         = {2011},
}

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