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The SINGS SED Tool is an IDL-based software designed for analyzing multi-wavelength images in a common coordinate system. It provides PSF-matched images across various bands including UV, optical, infrared, and radio. Users can select positions using circular apertures, facilitating flux measurements and SED creation. The tool features capabilities like image rotation, rescaling, interpolation, and background flux calculations. It ensures accurate uncertainty treatment and offers community-accessible resources related to SINGS data. Designed for local installation, it aims to enhance astronomical imaging analysis.
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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
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
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.
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)
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
Daniela Calzetti and Claus Leitherer (STScI) The SINGS Web site The community-accessible WWW site to the SINGS project
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
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?
