Compilation of photometry

| HyperLeda home | Documentation | Search by name | Search near a position | Define a sample | SQL Search |

This catalogue (table a107 in the database) presents the compilation of apparent fluxes (magnitudes) of galaxies. They are collected from the litterature and from surveys and are not corrected for Galactic extinction or for any other effect.

See the article on magnitude of galaxies from the NED knowledge database (Level 5).

In March 2006, the table counted 8.6 million measurements (in any color band) for 1.65 million galaxies.

Description of the fields

Field: mag

Magnitude with its uncertainty and quality flag in parentheses

Field: loga

Logarithm of aperture used for aperture photometry.
The diameter of the aperture is measured in 0.1 arcmin (e.g. logA=1 means that the aperture A=10 in 0.1',
i.e. A=1')

Field: iso

Isophote: isophotal limiting surface brightness for isophotal magnitude in mag.arcsec^-2

Field: bandname

Photometric Band. The definitions are given in the "bands_codes" table:

Field: tel

Telescope. Used for 21cm flux corrections during the homogenisation. The definitions are given in the "telescopes_codes" table:

Field: code_mag

Code for the type of magnitude as given in the"mag_codes" table:

Field: beam_c

code telling that the 21-cm line flux is corrected (1) or uncorrected (0) for the beam filling effect