| Name | DDT_ebergin_9 |
| Title | DDT request to observe the Herschel/HIFI ULine in the Orion Bar and W49 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342244038&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-yrili9k |
| Author | bergin, e. |
| Description | One of the key science goals of the HIFI instrument on Herschel has beenthe ability to quickly perform unbiased spectral line surveys. Thehoped-for outcome, besides the analysis of known molecules throughmultiple lines, has been the detection of previously unknown species. Andindeed, a number of unidentified lines have been found, both inemission and in absorption. The most spectacular, but also mostpuzzling of these is the 617 GHz absorption line feature first foundtoward Sgr~B2 and now seen in absorption towards other galactic sources.It is the only U-line found that does not trace the core or envelope ofSgr~B2, but rather the gas in the line-of-sight clouds in the spiral arms and Galactic center, between us and Sgr~B2. At present there is no knowncarrier for this feature.We request DDT observing time to improve a potential detection of this linein emission towards one galactic source and another source withnarrow absorption lines. If the detection is confirmed the narrowlines of these sources will enable a search for hyperfine structure whichcan be used to narrow the search for molecular carriers. |
| Publication | |
| Instrument | HIFI_HifiPoint_dbs |
| Temporal Coverage | 2012-04-10T04:12:47Z/2012-04-14T15:54:32Z |
| Version | SPG v14.1.0 |
| 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 | 2012-10-14T15:52:34Z |
| Last Update | 2025-01-24 |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, bergin et al., 2012, 'DDT request to observe the Herschel/HIFI ULine in the Orion Bar and W49', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-yrili9k |