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HyperLEDA documentation: parameter: mfir

Far Infrared flux: mfir

IRAS fluxes at 60 um and 100 um are converted in the so-called far-infrared flux according to the relation:

mfir = -2.5 log(2.58 f60 + f100) + 14.75

where f60 and f100 are IRAS fluxes at 60 m and 100 m expressed in Jansky. This relation is equivalent to the relation given in RC3. The term 14.75 comes from the zero-point chosen in RC3 (p.43, Rel. 49). The factor 2.58 comes from IRAS Point Source Catalog (1988).

The mfir magnitude is available for 11712 galaxies (May 2003 version of the database).

Flux at other wavelengths are given in the parameters: m21, bt, it. The corrected m21 is m21c.

HyperLeda

Questions: prugniel@obs.univ-lyon1.fr