| |
 |
| Paper: |
Optimal Point-Source Extraction for Spitzer IRS Spectra |
| Volume: |
376, Astronomical Data Analysis Software and Systems XVI |
| Page: |
437 |
| Authors: |
Narron, R.; Ogle, P.; Laher, R.R. |
| 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. |
|
|
|
|
|
