1. HST Spectroscopic Legacy Working Group Areas for Recommended Work in FY2014 and Beyond Meeting 12 Jun 2013

2. Overview Group has tried to identify main threads from the “Enhancing the Legacy of HST Spectroscopy” Workshop held at STScI on Nov 15-16, 2012 Membership of the group is as follows: Alessandra Aloisi (chair) Jerry Kriss Azalee Bostroem Cristina Oliveira Ken Carpenter Rachel OSten Stefano Casertano (co-chair) Lou Strolger Scott Fleming Jeff Valenti Andrew Fox Rick White 5 major areas of discussion were identified and explored: – TOPICS Highest priorities identified for the following tasks: – Make combined 1D spectral products available and create the pipeline to do it – Visualization tools for spectra – Characterization/classification of sources – Feature identification and measurement (develop equivalent of source extractor for spectra) Confluence used for collecting and storing material, and for tracking discussion

3. 1) Make Combined 1D Spectral Products Available and create the Pipeline to do it (Part 1) High priority, but will require ~ 2 years Ultimate purpose of this activity is to combine 1D spectroscopic data together. In order to do so a spectroscopic pipeline is required. Several pipelines already exist (developed by individuals or science teams) and can be used to facilitate design and requirements – Typically existing pipelines are tailored to specific science goals. – A more general design is required. – The writing of the pipeline should be done incrementally: The tool can start as an offline tool manually triggered to create new high- level products for our own HST data into the HLA. This will allow us to get something quickly and with high visibility. It could evolve into part of the OPUS/MAST pipeline. Ultimately it could become a stand-alone tool offered to the community, similarly to an ASTRODRIZZLE for spectroscopy.

4. 1) Make Combined 1D Spectral Products Available and create the Pipeline to do it (Part 2) For combination of 1D homogeneous data (HST similar instrument and resolution): -Phase 1 (6 months, FY 2014-Q1,Q2): design and requirements 0.3 FTE-year scientist 0.2 FTE-year RIA 0.5 FTE-year developer -Phase 2 (18 months, through FY 2015): development and testing 0.5 FTE-year scientist 1.0 FTE-year RIA 1.5 FTE-year developer -Phase 3 (partially overlapping with Phase 2, continuing effort): implementation, data processing and ingestion 1.5 FTE-year RIA/scientist (HLA FTEs) until the bulk of the data is ingested (start midway throughout second year of effort) For combination of heterogeneous data, add 50% or more – could be partly done in parallel For extended sources, the second dimension needs to be added (2D spectroscopy) High-level products (and possibly pipeline) need to be advertised with the community

5. 2) Visualization Tools for Spectra Medium-high priority, mostly based on adaptation of existing tools A lot of tools already exist spread throughout MAST, HLA, and VO – Existing tools are OK with a quick look – Existing tools need improvements to become more user friendly and for more in depth analysis – Everything should be consolidated into the portal – Timeframe is driven by integration into the portal – Tools need to be advertised with the community Resources needed: 1.0 FTE-year scientist 0.5 FTE-year for a scientist responsible for the project 0.5 FTE-year for several other scientists that would provide requirements and test the tools 0.5 FTE-year developer

6. 3) Characterization/Classification of Sources Highly desirable, relatively lower cost, may bring results in < 6 months – applicable to all HST data (imaging and spectroscopy) Multi-pronged approach – Literature analysis – Lexicon-based search – Catalog comparison – Crowd sourcing Resources needed: Literature analysis: increase priority of HST dataset-based (instead of program-based) literature association TBD FTE-year in Library Can scientist/RIA help? Lexicon-based search: build context-aware form interface based on VO-established lexicon Used to take advantage of target characterization in literature, proposals, abstracts, etc. Similar but simpler forms developed for Moving Target searches (with highly skilled intern) Developers with needed skill set are few, currently fully committed Needs either reprioritization of work or finding the right person outside standard channels (e.g., RIA with web-programming skills) Resources needed: probably < 0.5 FTE-year from developer, 0.2 to 0.5 FTE-year from science aware user(s) to test and refine interface Catalog comparison, crowd-sourcing: good methods to complement existing classification, not evaluated to establish one. TBD

7. 4) Feature Identification and Measurement (Develop the Equivalent of Source Extractor for Spectra) Medium priority, partly based on adaptation of existing tools May require multiple options to handle different types of data (emission/absorption, bands, forests; high S/N vs. low S/N; continuum structure) Useful tool may be obtained in ~ 1 year Resources needed: – 1.0 FTE-year scientist – 0.5 FTE-year developer

8. Other Areas of Possible Interest Multi-Object Spectral Extraction and Characterization (e.g., Grisms) – Not championed within working group – May be best led by instrument teams (e.g., WFC3 + JWST instrument teams) Tools to visualize and analyze time dependence – Common framework yet to be established HST data in meta-catalogs

9. Summary of Resources Year 1Year 2 Scientist (INS) RIA (INS) Developer (OED) HLA staff (HMO) Scientist (INS) RIA (INS) Developer (OED) HLA staff (HMO) Combined 1D spectra and pipeline 0.40.61.000.51.01.50.5 Visualization tools 0.501.000000 Source classification0.50 00000 Feature identification and measurement 00001.0000.5 TOTALS1.40.62.501.51.01.51.0 Resources amount to a total of ~ 5 FTEs per year spread between INS (COS/STIS team), OED, and HLA over a couple of years to get the bulk of the high priority items advanced to a significant level.