the sings sed tool
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
The SINGS SED ToolDaniela Calzetti (STScI)
June 10th, 2002
SSC DeliverableSSC Deliverable –
IDL Image Analysis Software to provide:
o PSF-matched, common-coordinate-system, multi-wavelength (UV, optical, infrared, SIRTF, radio) images o SEDs from user-selected positions and circular apertures on multi-wavelength images
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-) 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 m and MIPS 24, 70, 160 m 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)
Select_apertures.pro
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
ScheduleMilestone Dates FTEs
Requirements develop. 03/01/01-07/01/01 (DONE!)
1 wk (DC)
Code development
Delivery v1.0
01/01/02-06/07/02
06/07/02 (DONE!)
5 wks (DL)
Testing v1.0 06/11/02-09/30/02 2 wks (SINGS)
Code improvement
Delivery v2.0
09/30/02-12/31/02
12/31/02
2 wks (DL)
Testing v2.0 (real SIRTF data)
01/01/03-12/01/03 4 wks (SINGS)
Debugging/Delivery v3.0 03/31/04 2 wks (DL)
SSC Delivery L+27
The SINGS Web site
The community-accessible WWW site to
the SINGS project
Daniela Calzetti and Claus Leitherer (STScI)
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?
WWW Schedule
Milestone Dates FTEsRequirements develop. 06/01/01 – 02/20/02 1 wk (DC)
Pages development 06/01/02 – 09/30/02 2 wks (JC)
1 wks (CL)
Testing 09/30/02 – 12/31/02 2 wks (SINGS)
Outside accessibility 12/31/02
Back-up Slides
The SINGS WWW: Accessing the Data