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.