IRS Data Products:An Update

SINGS Team Meeting

21-22 November 2002

Baltimore, MD

L. ArmusSIRTF Science Center

LA - 2SINGS Team Meeting – 21 Nov 02

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[24]) 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.

LA - 3SINGS Team Meeting – 21 Nov 02

IRS Agenda

1. Intro and schedule highlights (10 mins) …………………….. Lee2. Making SIM data & Basic Mapping Strategies (30 mins) .… Danny3. How to make a cube (30 mins) ……………………………….. J.D.4. Comparison of SIM and cube data (20 mins) ……………….. Helene5. CubeView and the Project Manager (30 mins) ……………… J.D.6. Overall data flow (15 mins) ……………………………………. Lee

LA - 4SINGS Team Meeting – 21 Nov 02

Important SINGS-SSC Milestones

The 1st set of 1D spectra get delivered at L+9 [12] (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 [18]. 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 [15]. 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 [24]. These will include 1/3 of sample or what’s in archive at L+18 [21]. Another map delivery (second 1/3) also occurs at this time.

LA - 5SINGS Team Meeting – 21 Nov 02

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.

LA - 6SINGS Team Meeting – 21 Nov 02

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).

Release date

Data productL+9 L+15 L+21 L+27 L+33

Circum-nuclear

& HII regions

1D spectra

“Best BQD’s”

10% of sample or what’s in archive at L+7

- High-res line maps (NeII 12.8 & SiII 34.8)

- PAH feature maps([7.6 + 8.6] & 11.3)

- 1D map spectra

1/3 of sample or what’s in archive at L+12

Second 1/3 or what’s in archive at L+18

Final 1/3 or what’s in archive at L+24

All data

Spectral cubes1/3 of sample or what’s in archive at L+18

Final 2/3 or what’s in archive at L+24

All data

Radial strips

Continuum maps

1/3 of sample or what’s in archive at L+12

Second 1/3 or what’s in archive at L+18

Final 1/3 or what’s in archive at L+24

All data

Spectral cubes1/3 of sample or what’s in archive at L+18

Final 2/3 or what’s in archive at L+24

All data

Our Schedule (does not include 3 month “slip”)

8SINGS team mtg. – 10 Jan 2002

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.