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