| 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 been the ability to quickly perform unbiased spectral line surveys. The hoped-for outcome, besides the analysis of known molecules through multiple lines, has been the detection of previously unknown species. And indeed, a number of unidentified lines have been found, both in emission and in absorption. The most spectacular, but also most puzzling of these is the 617 GHz absorption line feature first found toward 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 of Sgr~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 known carrier for this feature. We request DDT observing time to improve a potential detection of this line in emission towards one galactic source and another source with narrow absorption lines. If the detection is confirmed the narrow lines of these sources will enable a search for hyperfine structure which can 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 |
| 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 |