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MIPS : Aperture Corrections


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Over the past few months the MIPS IT and IST, as part of a large project to better understand and to improve the MIPS photometric calibration, have determined different aperture corrections for the current MIPS Photometric modes (24 um, 70 um, 70 um fine scale and 160 um) plus Spectral Energy Distribution (SED).

The present tables are a first attempt to summarize these efforts, and although we don't expect dramatic changes, they should not be taken as the last word on the subject.

For our calibration purposes, where single stars or asteroids are observed using photometric observations, we use the following values:

  • At 24 um:
    • aperture radius = 35 arcsec,
    • background annulus = 40 arcsec to 50 arcsec,
    • aperture correction = 1.082
  • At 70 um:
    • aperture radius = 30 arcsec,
    • background annulus = 40 arcsec to 60 arcsec,
    • aperture correction = 1.295
  • At 160 um:
    • aperture radius = 24 arcsec,
    • background annulus = 64 arcsec to 128 arcsec,
    • aperture correction = 2.34

James Muzerolle, Karl Gordon, Chad Engelbracht and John Stansberry (MIPS IT) obtained the original corrections which have been cross-checked by Dario Fadda, Nanyao Lu, William Wheaton and Stefanie Wachter (MIPS IST).

24 micron

70 micron Default

70 micron Fine Scale (aka Narrow Field)

160 micron

160ApCorr_StdAps.txt (same contents as table above, plus a little bit more)

SED


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This file was last modified on Thu Sep 28 12:41:04 2006.

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