Magnitude with its uncertainty and quality flag in parentheses.
The uncertainty flag (2) indicates a detection limit (the flux is fainter
than the given value).
Fluxes originally given in physical flux density are converted into AB magnitude
(eg. magAB = -2.5 * log(flux/mJy) + 16.4 ).
Logarithm of aperture used for aperture photometry.Field: loga
The diameter of the aperture is measured in 0.1 arcmin (e.g. logA=1
means that the aperture diameter is 1 arcmin)
Isophote: isophotal limiting surface brightness for isophotal magnitude in mag.arcsec-2
Photometric Band. The definitions are given in the band_codes table:
Telescope. Used for 21cm flux corrections during the homogenisation. The definitions are given in the "telescope_codes" table:
Code for the type of magnitude as given in the"mag_codes" table:
value | signification |
---|---|
0 | Direct (uncorrected) measurement |
1 | HI observation corrected for beam filling factor |
2 | Magnitude corrected for the Galactic extinction and k-correction |
value | signification |
---|---|
0 | regular measurement |
1 | uncertain measurement, its weight is decreased by a factor 2 when computing the average value |
2 | detection limit |
3 | preliminary measurement, probably superseeded in a more recent publication, it is ignored unless no other measurement is available |
4 | compilation, it is ignored unless no other measurement is available |
9 | rejected measurement |
HyperLeda | Questions: leda@univ-lyon1.fr |