Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3
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. Am...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2011
|
| _version_ | 1797077211786772480 |
|---|---|
| author | Omont, A Neri, R Cox, P Lupu, R Guelin, M van der Werf, P Weiss, A Ivison, R Negrello, M Leeuw, L Lehnert, M Smail, I Verma, A Baker, A Beelen, A Aguirre, J Baes, M Bertoldi, F Clements, D Cooray, A Coppin, K Dannerbauer, H De Zotti, G Dye, S Fiolet, N |
| author_facet | Omont, A Neri, R Cox, P Lupu, R Guelin, M van der Werf, P Weiss, A Ivison, R Negrello, M Leeuw, L Lehnert, M Smail, I Verma, A Baker, A Beelen, A Aguirre, J Baes, M Bertoldi, F Clements, D Cooray, A Coppin, K Dannerbauer, H De Zotti, G Dye, S Fiolet, N |
| author_sort | Omont, A |
| collection | OXFORD |
| description | 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 202-111 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 1.6σ. The intrinsic line luminosity and ratio of H2O(2 02 - 111)/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 202 - 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. © 2011 ESO. |
| first_indexed | 2024-03-07T00:14:39Z |
| format | Journal article |
| id | oxford-uuid:7a664306-8a9f-449f-85b4-c26f209f2faa |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:14:39Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:7a664306-8a9f-449f-85b4-c26f209f2faa2022-03-26T20:43:55ZObservation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7a664306-8a9f-449f-85b4-c26f209f2faaEnglishSymplectic Elements at Oxford2011Omont, ANeri, RCox, PLupu, RGuelin, Mvan der Werf, PWeiss, AIvison, RNegrello, MLeeuw, LLehnert, MSmail, IVerma, ABaker, ABeelen, AAguirre, JBaes, MBertoldi, FClements, DCooray, ACoppin, KDannerbauer, HDe Zotti, GDye, SFiolet, NThe 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 202-111 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 1.6σ. The intrinsic line luminosity and ratio of H2O(2 02 - 111)/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 202 - 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. © 2011 ESO. |
| spellingShingle | Omont, A Neri, R Cox, P Lupu, R Guelin, M van der Werf, P Weiss, A Ivison, R Negrello, M Leeuw, L Lehnert, M Smail, I Verma, A Baker, A Beelen, A Aguirre, J Baes, M Bertoldi, F Clements, D Cooray, A Coppin, K Dannerbauer, H De Zotti, G Dye, S Fiolet, N Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title | Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title_full | Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title_fullStr | Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title_full_unstemmed | Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title_short | Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3 |
| title_sort | observation of h2o in a strongly lensed herschel atlas source at z 2 3 |
| work_keys_str_mv | AT omonta observationofh2oinastronglylensedherschelatlassourceatz23 AT nerir observationofh2oinastronglylensedherschelatlassourceatz23 AT coxp observationofh2oinastronglylensedherschelatlassourceatz23 AT lupur observationofh2oinastronglylensedherschelatlassourceatz23 AT guelinm observationofh2oinastronglylensedherschelatlassourceatz23 AT vanderwerfp observationofh2oinastronglylensedherschelatlassourceatz23 AT weissa observationofh2oinastronglylensedherschelatlassourceatz23 AT ivisonr observationofh2oinastronglylensedherschelatlassourceatz23 AT negrellom observationofh2oinastronglylensedherschelatlassourceatz23 AT leeuwl observationofh2oinastronglylensedherschelatlassourceatz23 AT lehnertm observationofh2oinastronglylensedherschelatlassourceatz23 AT smaili observationofh2oinastronglylensedherschelatlassourceatz23 AT vermaa observationofh2oinastronglylensedherschelatlassourceatz23 AT bakera observationofh2oinastronglylensedherschelatlassourceatz23 AT beelena observationofh2oinastronglylensedherschelatlassourceatz23 AT aguirrej observationofh2oinastronglylensedherschelatlassourceatz23 AT baesm observationofh2oinastronglylensedherschelatlassourceatz23 AT bertoldif observationofh2oinastronglylensedherschelatlassourceatz23 AT clementsd observationofh2oinastronglylensedherschelatlassourceatz23 AT cooraya observationofh2oinastronglylensedherschelatlassourceatz23 AT coppink observationofh2oinastronglylensedherschelatlassourceatz23 AT dannerbauerh observationofh2oinastronglylensedherschelatlassourceatz23 AT dezottig observationofh2oinastronglylensedherschelatlassourceatz23 AT dyes observationofh2oinastronglylensedherschelatlassourceatz23 AT fioletn observationofh2oinastronglylensedherschelatlassourceatz23 |