Herschel Science Centre e-News#40
Posted by h schelp on 07 February 2018 12:50 AM
Herschel Science Centre e-News#40
7 February 2018
Herschel enters the Legacy Science Phase
On 31 December 2017 Herschel reached the end of its Post-Operational Phase. After 3.5 years of successful Operations and more than 4.5 years of active Post-Operations following Helium boil-off on 29 April 2013, Herschel is now in the 'Legacy Science Phase' in which, at least for some time, dedicated (but limited) support to the Herschel users community will still be provided by the HSC (and by the NHSC in the US).
In addition to the usual interactions with the community through the HSC Helpdesk, efforts will be concentrated on the enhancement of the contents of the legacy Herschel Science Archive through the ingestion of new UPDPs (User Provided Data Products, coming from the community) and HPDPs (Highly Processed Data Products, generated by mission experts), the consolidation of the Herschel Explanatory Legacy Library (the legacy documentation of the Herschel mission), and the generation of training material for future users of archival data in the format of a collection of video tutorials covering different aspects of the mission, including handling of legacy data products, how to address specific data reduction problems, or the usage of the archive, among other topics.
Release of a new version of the Herschel Science Archive (HSA v8.2)
A new version (v8.2) of the Herschel Science Archive (HSA) was released in August 2017, offering several important new functionalities like:
- the ingestion, visualization and retrieval of Highly Processed Data Products (HPDPs) and Ancillary Data Products (ADPs);
- the re-organization of the 'Observation Constraints' panel with a new 'Object Type' tab that allows queries by 'Science Area' and 'Science Category';
- the possibility to query observations using the 'Proposal' tab by 'Co-authors' and/or by strings contained in the proposal abstracts;
- improvements in the ingestion, visualization and retrieval of User Provided Data Products (UPDPs)
- improvements in the accuracy of geometrical searches;
- improvements of the Postcards visor;
- a new 'HSA Users Guide';
- a more complete and user-friendly 'Welcome Page';
- the correction of various minor bugs.
We would also like to let you know that we are currently working on the development of a final, legacy version (HSA v9.0) of the archive, that will include some additional new functionalities, like integrated publications and catalogue query tools, with foreseen release in the coming months.
You can access the latest version of the archive at any time at:
Welcome to HELL (Herschel Explanatory Legacy Library)
The Herschel Explanatory Legacy Library (HELL) is a compilation of Herschel related documentation that puts at the Legacy user’s fingertips the most important documents of the thirty-five years of history of the Herschel mission. The end result is a library of over 1300 documents that preserve the most essential knowledge of the Herschel mission.
Besides the top-level, renovated versions of the Handbooks (4 volumes; one dedicated to the Observatory & Spacecraft, and one for each of the three instruments onboard Herschel: HIFI, PACS and SPIRE), the documentation is organised in several levels of depth for each area:
* Level 1 is the most basic and fundamental documentation to get a rapid overview. These are a relatively small number of documents to read.
* Level 2 documentation gives more detail on individual topics. This documentation provides more technical information when required to follow-up the top-level information.
* Level 3 contains a large number of documents that are either highly technical, for specialist knowledge, or documents that are out or date, or now of historical interest only.
The portal to HELL is available at:
Enjoy navigating the Herschel legacy documentation and please provide feedback on the contents provided and/or the way the information is structured if you think there is room for improvement, or important missing information.
New Highly Processed Data Products (HPDPs) available
The full list of HPDPs currently ingested in the Herschel Science Archive or planned for ingestion in the near future is available at: http://www.cosmos.esa.int/web/herschel/highly-processed-data-productsAmong the datasets recently released and made available through the Herschel Science Archive you can find the following ones:
1. PACS JScanam mosaics: improved quality PACS mosaics of very extended regions created using the JScanam map-maker. These regions could not be covered by a single pair of PACS observations (scan + cross-scan) and required several additional pointings. Examples of these kind of maps are those of the Milky Way, the Orion star forming region or the Large and Small Magellanic Clouds.
Web page: https://www.cosmos.esa.int/web/herschel/pacs-jscanam-mosaics-hpdp
Release Note: https://arxiv.org/pdf/1512.03252.pdf
Data repository: http://archives.esac.esa.int/hsa/legacy/HPDP/PACS/PACS-P/JScanam/
2. PACS Unimap mosaics: improved quality PACS mosaics created using the Unimap map-maker of sky regions associated to observations that were all acquired in parallel mode and processed only up to Level 2 by the standard processing pipeline. They are in some cases combinations of redundant observations of areas of the sky also covered by other higher level maps (Level 2.5 or Level 3) or, in some cases, large maps that were acquired using an unusual scan strategy that prevented the generation of the standard Level 2.5 products. Among those there are the North and South Galactic Pole observations, acquired within the H-ATLAS observing programme, and the Magellanic Clouds, acquired within the HERITAGE observing programme.
Web page: https://www.cosmos.esa.int/web/herschel/pacs-unimap-mosaics-hpdp
3. SPIRE HiRes maps: A subset of ~800 SPIRE high signal-to-noise maps at level2 and level2_5 that were deconvolved using the good knowledge of the SPIRE beam and a procedure based on the Richardson-Lucy deconvolution algorithm. The HiRes maps are calibrated for extended emission (in units of MJy/sr) and have on average a factor of 2 better spatial resolution than the standard Level 2 and Level 2.5 products generated by the pipeline.
Web page: https://www.cosmos.esa.int/web/herschel/spire-high-resolution-maps
4. HIFI Expert Reduced Spectral Scans: Baseline-corrected versions of about 2/3 of the ~500 Level 2.5 deconvolved products generated by the standard pipeline for HIFI Spectral Scan observations. The baseline cleaning method corrects for residual artefacts in the form of standing waves and other baseline distortions degrading the quality of the individual Level 2 products used to feed the deconvolution algorithm. It is noted, however, that owing to the semi-automated data processing approach used, sub-optimal line masking may still lead in some cases to imperfect baseline correction, especially in the presence of complicated line profiles, or under high line density circumstances.
Web page: https://www.cosmos.esa.int/web/herschel/hifi-spectral-scans-hpdp
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