This page describes the Point Source Functions (PSFs) and provides FITS files of the Point Response Functions (PRFs) for IRS Peak-Up Imaging. (Peak-up target acquisition images are obtained differently, using the Double Correlated Sampling mode.) A PRF is the convolution of an oversampled PSF with the pixel response function, and is required by the point source extraction module (APEX) within MOPEX to perform PSF fitting. An explanation of the difference between PRFs and PSFs is given in the document PRF v PSF (PDF, 41 KB).

PSFs

Blue

The PSF shown below is based on observations of the star HD 42525. The relevant data have AORKEYs 17080064 and 17082112, and were mosaicked using MOPEX.

Blue Peak-up PSF, ~54 arcsec on a side.

Blue Peak Up PSF Profile

Red

The PSF shown below is based on observations of the star HD 172728. The relevant data have AORKEYs 20552960 and 20678912, and were mosaicked using MOPEX.

Red Peak-up PSF, ~54 arcsec on a side.

Red Peak Up PSF Profile

PRFs

The SSC developed three different kinds of PRFs, with varying pixel scales and interpolation methods (see MOPEX User's Guide). Users should choose the PRF that best matches the data reduction technique used to create their mosaics.

1. standard pixel scale (1.8 arcsec) and default interpolation

• current:
  • Blue Feb 2009 (FITS, 48 KB)
  • Red Feb 2009 (FITS, 93 KB)
• previous:
  • Blue Aug 2006 (FITS, 39 KB)
  • Red Aug 2006 (FITS, 51 KB)

2. resampled pixel scale (0.9 arcsec) and default interpolation

• Blue March 2010 (FITS, 200 KB)
• Red March 2010 (FITS, 402 KB)

3. resampled pixel scale (0.9 arcsec) and drizzle interpolation

• Blue March 2010 (FITS, 200 KB)
• Red March 2010 (FITS, 402 KB)