<> <http://www.w3.org/2000/01/rdf-schema#comment> "The repository administrator has not yet configured an RDF license."^^<http://www.w3.org/2001/XMLSchema#string> . <> <http://xmlns.com/foaf/0.1/primaryTopic> <https://discovery.ucl.ac.uk/id/eprint/1427243> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/AcademicArticle> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Article> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/title> "Herschel spectral mapping of the Helix nebula (NGC 7293): Extended CO photodissociation and OH+ emission"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/abstract> "Context. The Helix nebula (NGC 7293) is our closest planetary nebulae. Therefore, it is an ideal template for photochemical studies at small spatial scales in planetary nebulae. Aims. We aim to study the spatial distribution of the atomic and the molecular gas, and the structure of the photodissociation region along the western rims of the Helix nebula as seen in the submillimeter range with Herschel. Methods. We used five SPIRE FTS pointing observations to make atomic and molecular spectral maps. We analyzed the molecular gas by modeling the CO rotational lines using a non-local thermodynamic equilibrium (non-LTE) radiative transfer model. Results. For the first time, we have detected extended OH emission in a planetary nebula. The spectra towards the Helix nebula also show CO emission lines (from J = 4 to 8), [N ii] at 1461 GHz from ionized gas, and [C i] (P- P), which together with the OH lines trace extended CO photodissociation regions along the rims. The estimated OH column density is ~ 10 - 10 cm . The CH (1-0) line was not detected at the sensitivity of our observations. Non-LTE models of the CO excitation were used to constrain the average gas density (n(H) ~ (1 - 5) × 10 cm) and the gas temperature (T ~ 20-40 K). Conclusions. The SPIRE spectral-maps suggest that CO arises from dense and shielded clumps in the western rims of the Helix nebula, whereas OH and [C i] lines trace the diffuse gas and the UV and X-ray illuminated clump surfaces where molecules reform after CO photodissociation. The [N ii] line traces a more diffuse ionized gas component in the interclump medium. © ESO, 2014."^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/date> "2014-06" . <https://discovery.ucl.ac.uk/id/document/58964> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Document> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/volume> "566" . <https://discovery.ucl.ac.uk/id/publication/ext-00046361> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Collection> . <https://discovery.ucl.ac.uk/id/publication/ext-00046361> <http://xmlns.com/foaf/0.1/name> "Astronomy and Astrophysics"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/publication/ext-00046361> . <https://discovery.ucl.ac.uk/id/publication/ext-00046361> <http://www.w3.org/2002/07/owl#sameAs> <urn:issn:00046361> . <https://discovery.ucl.ac.uk/id/publication/ext-00046361> <http://purl.org/ontology/bibo/issn> "00046361" . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/status> <http://purl.org/ontology/bibo/status/published> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-9b10be1cbc3b6cd77e710e4b19d7dd6c> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> <https://discovery.ucl.ac.uk/id/person/ext-9b10be1cbc3b6cd77e710e4b19d7dd6c> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-a87188a1fbf5d366bb5f7cf186a6739e> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> <https://discovery.ucl.ac.uk/id/person/ext-a87188a1fbf5d366bb5f7cf186a6739e> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-4e7afbb7e6e283dd08415a7c90ad7821> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_5> <https://discovery.ucl.ac.uk/id/person/ext-4e7afbb7e6e283dd08415a7c90ad7821> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-9c7954bb10974203178f43ed47bb3f8a> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_6> <https://discovery.ucl.ac.uk/id/person/ext-9c7954bb10974203178f43ed47bb3f8a> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-48f9c20deb28f91c8510d787147921e8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_7> <https://discovery.ucl.ac.uk/id/person/ext-48f9c20deb28f91c8510d787147921e8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-53a6007e3e4021338a3143df06da4fc8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_8> <https://discovery.ucl.ac.uk/id/person/ext-53a6007e3e4021338a3143df06da4fc8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_9> <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_10> <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-6d906fdbb6e509ce10ebf2828b065c72> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_11> <https://discovery.ucl.ac.uk/id/person/ext-6d906fdbb6e509ce10ebf2828b065c72> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_12> <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_13> <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_14> <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-b403fea52005403f7a59d5396f6770be> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_15> <https://discovery.ucl.ac.uk/id/person/ext-b403fea52005403f7a59d5396f6770be> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> . <https://discovery.ucl.ac.uk/id/eprint/1427243> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> . <https://discovery.ucl.ac.uk/id/eprint/1427243#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_16> <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> . <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> <http://xmlns.com/foaf/0.1/givenName> "JR"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> <http://xmlns.com/foaf/0.1/familyName> "Goicoechea"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-b1c4b12e35fc17f97f313a67229351a2> <http://xmlns.com/foaf/0.1/name> "JR Goicoechea"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> <http://xmlns.com/foaf/0.1/givenName> "ET"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> <http://xmlns.com/foaf/0.1/familyName> "Polehampton"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-d2436f58f20aeb684978b2580332cc25> <http://xmlns.com/foaf/0.1/name> "ET Polehampton"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> <http://xmlns.com/foaf/0.1/givenName> "TL"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> <http://xmlns.com/foaf/0.1/familyName> "Lim"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9822fd8d91259a44b86a37137c1caea8> <http://xmlns.com/foaf/0.1/name> "TL Lim"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> <http://xmlns.com/foaf/0.1/givenName> "M"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> <http://xmlns.com/foaf/0.1/familyName> "Etxaluze"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6bb92feb18082e49b32e353c41f54ce3> <http://xmlns.com/foaf/0.1/name> "M Etxaluze"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> <http://xmlns.com/foaf/0.1/givenName> "F"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> <http://xmlns.com/foaf/0.1/familyName> "Lique"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-bc860cb9a01d5d771316067b226edbdd> <http://xmlns.com/foaf/0.1/name> "F Lique"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> <http://xmlns.com/foaf/0.1/givenName> "M"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> <http://xmlns.com/foaf/0.1/familyName> "Matsuura"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-22496f33556f6b08f2d73ed3c7360e5b> <http://xmlns.com/foaf/0.1/name> "M Matsuura"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> <http://xmlns.com/foaf/0.1/givenName> "F"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> <http://xmlns.com/foaf/0.1/familyName> "Kerschbaum"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e86771f984a6128910b4cb145e0a4d72> <http://xmlns.com/foaf/0.1/name> "F Kerschbaum"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> <http://xmlns.com/foaf/0.1/givenName> "T"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> <http://xmlns.com/foaf/0.1/familyName> "Ueta"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6031b8583bcb1f663afbb3b9ba95c0c5> <http://xmlns.com/foaf/0.1/name> "T Ueta"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-a87188a1fbf5d366bb5f7cf186a6739e> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . 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