Optimal Point-Source Extraction for Spitzer IRS Spectra
- Creators
- Narron, Robert
-
Ogle, Patrick
-
Laher, Russ R.
- Others:
- Shaw, R. A.
- Hill, F.
- Bell, D. J.
Abstract
A new optimal-extraction technique has been developed for deriving point-source spectra from data taken by the Infrared Spectrograph (IRS) on-board the Spitzer Space Telescope. The new technique gives improvements of up to a factor of two in the signal-to-noise ratio (S/N) for faint (< 10 mJy) sources, corresponding to an effective quadrupling of the exposure time. Regular extraction consists of an even-weighted summing of pixel values at the same wavelength. Optimal extraction weights each pixel by its S/N, estimated using the spatial profile of a bright calibration star and data uncertainties. Additionally, the optimal-extraction calculations are performed in "rectified" space, and so a natural by-product of the processing is a useful output file containing the rectified image. The optimal-extraction technique is unsuitable for extended sources and best only for point sources.
Additional Information
© 2007 Astronomical Society of the Pacific. This work was performed at the Spitzer Science Center as part of a mission/project managed by Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.Attached Files
Published - Narron2007p8941Astronomical_Data_Analysis_Software_And_Systems_Xvi.pdf
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Additional details
- Eprint ID
- 20124
- Resolver ID
- CaltechAUTHORS:20100924-103609561
- NASA/JPL/Caltech
- Created
-
2010-09-24Created from EPrint's datestamp field
- Updated
-
2020-03-03Created from EPrint's last_modified field
- Series Name
- ASP Conference Series
- Series Volume or Issue Number
- 376