| Name | GT1_abenz_1 |
| Title | Completing the OH ladder for HH 46 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342210792&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-50bzcph |
| Author | benz, a. |
| Description | First results from PACS observations towards the low-mass protostar HH 46 showsurprisingly bright OH lines. The hydroxyl radical OH plays important roles inthe water and oxygen chemistry of star-forming regions and their cooling.Furthermore, the hydroxyl-to-water line ratios are interesting tracers forionizing radiation.We propose a nearly complete observation of the OH ladder in low-mass star formationfor the first time. Four OH transitions in the class I object HH 46 were detected byPACS. We propose complementary observations towards the source in PACS line spectroscopy mode at 53, 56, 65,71, 96, 115 and 135 micron. We gain insight in the origin and formation of OH fromthe PACS spatial information. The completeness of the OH ladder allows a reliabledetermination of the OH abundance and thus constrains water chemistry and coolingcontribution more precisely.In addition, we propose HIFI observations of the OH transition at 163.4 micron to resolve the three hyperfine components for the first time.This will allow to determine optical depths of OH and test the hypothesis ofasymmetries between the two closely spaced triplets, as the second triplet will beobserved within the HIFI priority science program.Note: This proposal is submitted under the Swiss part of the HIFI guaranteedtime program; HIFI PI: Frank Helmich, HIFI Swiss Lead CoI: Arnold O. Benz |
| Publication |
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| Instrument | HIFI_HifiPoint_dbs, PACS_PacsLineSpec_large |
| Temporal Coverage | 2010-12-04T00:25:54Z/2011-05-07T20:37:47Z |
| Version | SPG v14.2.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth cornerstone mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2011-12-15T00:00:00Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, benz et al., 2011, 'Completing the OH ladder for HH 46', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-50bzcph |