IRS Data Products:An Update SINGS Team Meeting 21-22 November 2002 Baltimore, MD L. Armus SIRTF Science Center
What we’ve been up to Since the last meeting, the IRS team has concentrated on the following three areas: • Creation of simulated IRS BCD’s (Danny). • Basic test patterns and more realistic models based upon N6946 ISOCAM data. Have concentrated on the mechanics of re-creating the maps. • Creation of IRS cubes (J.D.). • Software to turn pipeline BCD’s into cubes & allow for intelligent map and spectral extractions (Cubeview and project manager). • Analysis of cubes and SIM data (Helene). • Critical 3rd-party evaluation of products. Until the 1st delivery of cubes (L+21) we envision CUBISM to be a tool, run by one or more members of the IRS sub-group, for the purposes of official team deliveries and initial SSC data products.
IRS Agenda • Intro and schedule highlights (10 mins) …………………….. Lee • Making SIM data & Basic Mapping Strategies (30 mins) .… Danny • How to make a cube (30 mins) ……………………………….. J.D. • Comparison of SIM and cube data (20 mins) ……………….. Helene • CubeView and the Project Manager (30 mins) ……………… J.D. • Overall data flow (15 mins) ……………………………………. Lee
Important SINGS-SSC Milestones • The 1st set of 1D spectra get delivered at L+9  (only two months after the archive opens). These will be “best post-BCDs”, i.e. not derived from the cubes. • This is only 2 months after the archive opens, so we will not have much time to generate and validate the data. • The work will involve re-running the pipeline with non-standard extractions, de-fringing, co-adding source and “background” spectra, etc. • Our 1st maps get delivered at L+15 . These will be derived from the nuclear, HII and radial strip cubes for 1/3 of the sample or what’s in archive at L+12 . • We must make these maps from L+1213 [15-18] to have enough time for team review and one iteration. • Our 1st cubes get delivered at L+21 . These will include 1/3 of sample or what’s in archive at L+18 . Another map delivery (second 1/3) also occurs at this time.
Product Definitions 1D spectra (best BQDs) - Start with a set of de-fringed 1D spectra. - Find the peak spectrum at 12 m (SH and SL), 25 m (LH), and co-add 3x3 spectra around (and including) this peak. This is the “source spectrum”. - Co-add the rest of the map spectra to create the local background. Subtract this from the source spectrum. - All results will be checked by hand (e.g. de-fringing, avoiding finding source near edge of map, etc.) High-res maps - continuum-subtracted maps of the NeII 12.8m (=22 eV), NeIII 15.6m (=41 eV), and SiII 34.8 m (=8 eV) lines will be produced. Continuum maps will also be provided.
Product Definitions PAH feature maps - no adjacent continuum subtraction will be performed. (features will dominate, and the 1D spectra will allow an easy determination of continuum-only sources) 1D map spectra - created from 2D spectral maps. Spectral cubes - one cube per (sub) slit, created with CUBISM tool. - there will be no spatial smoothing, but they may have a single spectral resolution (under discussion).
CUBISM Milestones • The 1st functional CUBISM interface was scheduled for 30 Sept 2002. We are a bit behind schedule, but will have demo today ! • We planned on having an Alpha internal SINGS team release in mid-Dec., but this will have to be pushed back to late Janearly Feb. It will coincide with a first team-wide release of CubeView. • Most of our delay is due to tackling tricky issues (e.g. separation of spatial and spectral pixels) and the evolving definitions of BCD formats, headers, etc. at the SSC.