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The SINGS SED Tool

The SINGS SED Tool. SSC Deliverable – IDL Image Analysis Software to provide: PSF-matched, common-coordinate-system, multi-wavelength (UV, optical, infrared, SIRTF, radio) images SEDs from user-selected positions and circular apertures on multi-wavelength images.

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The SINGS SED Tool

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  1. The SINGS SED Tool • SSC Deliverable – IDL Image Analysis Software to provide: • PSF-matched, common-coordinate-system, multi-wavelength (UV, optical, infrared, SIRTF, radio) images • SEDs from user-selected positionsand circular apertures on multi-wavelength images Daniela Calzetti (STScI) June 10th, 2002

  2. General Tool Description • Characteristics: • written in IDL • uses basic IDL astronomical library • composed of multiple, stand-alone routines • needs to be installed locally on user’s computer • coded by professional programmer (Don Lindler, e.g. STIS • GTO pipeline) • cost-effective: recycles existing routines/widgets

  3. General Tool Description (2) • Capabilities: • Rotates, rescales, interpolates multiple (multi-l) images of • an object to common coordinate system and resolution; • uses both bi-linear interpolation and drizzle (batch mode) • Convolves images to a selected PSF from available • choices: IRAC 8 mm and MIPS 24, 70, 160 mm PSFs • (batch mode) • Allows selection of multiple circular apertures on reference • image, plus circular background regions (interactive widget) • Calculates total and background-subtracted fluxes in • selected apertures from the original images.

  4. General Tool Description (3) • Inputs: • Set of n calibrated science images with world coordinate • system astrometry header (FITS images; e.g., multiple • wavebands of a target) • Associated uncertainty images (FITS images; if not present, • gain keyword will be used) • PSF library (FITS images; SINGS provided) • Outputs: • Aligned/convolved images (multi-extension FITS image) • Fluxes and background values and uncertainties for all • wavebands in each aperture (SEDs; ASCII file) • Imprints of apertures on original images (postscript)

  5. Select_apertures.pro

  6. General Tool Description (4) • Advantages over existing IRAF tools: • Simultaneous flux measurements in n images with • multiple apertures and backgrounds • Measurements done on original images • Creation of SED file for all specified apertures • Treatment/propagation of uncertainties • Deliverable to SSC • IDL routines • Help file/documentation for installation and use

  7. Schedule

  8. Daniela Calzetti and Claus Leitherer (STScI) The SINGS Web site The community-accessible WWW site to the SINGS project

  9. The SINGS WWW: Scope and Location • Scope: • To provide the community with shortcuts and links • to the (potentially multiple) archives where SINGS • data and tools will be located: • SIRTF and ancillary data, and tools archived at IRSA • HST/NICMOS data archived in MAST • Links to complementary data (not SSC-delivered) • that may not be systematically archived and/or NED • To provide the community with general information and • documentation on the SINGS project. • Physical Location: • Dedicated hard-disk at STScI attached to STARBURST99 • server (disk space not an issue) • Mirror site at Arizona • Accessible from STScI WWW Main Page

  10. The SINGS WWW: Structure • Structure: • The Web pages will be developed by STScI computer intern Julia Chen • The pages will NOT use frames (for robustness) • A simplified search capability will be provided (not a search engine) • The Main page will contain introductory information on • the project, and will provide access to archives (as appropriate) • and further SINGS-related documentation • Question/Issue: • Will we be able to link directly to individual IRSA products, • or will we need to send users to the IRSA main page?

  11. WWW Schedule

  12. Back-up Slides

  13. The SINGS WWW: Accessing the Data

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