Magnitude/Flux/Jansky Converter

Optical and radio astronomy meet at the wavelengths covered by NICMOS. To facilitate HST proposal writing for both communities the ST-ECF has developed these Magnitude to/from Jansky Converters:

• Point Source Flux Converter

• Extended Source Flux Converter

They are written in Javascript and the code is visible on the HTML source page, thus it is accessible to users for inspection and improvements.

If you produce an updated version on the basis of these tools please let us know the URL (see contact address at the bottom of this page).

Usage:

Three are the input fields: Magnitude, Flux or NICMOS.
Correspondingly the user can select the associated units:

• Photometric system and band for the Magnitude;
• Some of the most used units for the Flux;
• Janskys and Jy/arcsec**2 are the units for NICMOS.

Like in a spread sheet, whenever an input field is changed, the other two will be automatically computed according to the chosen units.

For a better user-friendliness, two fill-in forms are provided:

• one for point sources
• and the other for extended sources

Both the forms have the same functionality and layout.

References:

• ``Flux Units and NICMOS'', Instrument Science Report NICMOS-014,
  C.J. Skinner, STScI, February 29, 1996.

• See also: a list of NICMOS Documents (at STScI)

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