A Catalog of Isolated Galaxy Pairs Limited to Absolute Magnitude -18.5 Drawn from HyperLEDA Database |
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| Authors: | L Nottale P Chamaraux |
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| Institution: | 1.LUTH, UMR CNRS 8102,Paris Observatory,Meudon CEDEX,France;2.GEPI, UMR CNRS 8111,Paris Observatory,Meudon CEDEX,France |
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| Abstract: | The present paper is devoted to the construction of a catalog of isolated galaxy pairs extracted from the HyperLEDA extragalactic database. The radial velocities of the galaxies in the pairs are in the range 3000, 16000] km s?1. In order to get an unbiased pair catalog as complete as possible, we have limited the absolute magnitude of the galaxies to M ≤ ?18.5. The criteria used to define the isolated galaxy pairs are the following: 1) velocity criterion: radial velocity difference between the pair members ΔV < 500 kms?1; 2) interdistance criterion: projected distance between the members rp < 1 Mpc; 3) reciprocity criterion: each member is the closest galaxy to the other one, which excludes multiplets; 4) isolation criterion: we define a pair as isolated if the ratio ρ = r3/rp of the projected distance of the pair to its closest galaxy (this one having a velocity difference lower than 500 km s?1 with respect to the pair) and the members projected interdistance rp is larger than 2.5.We have searched for these closest galaxies first in HyperLEDA M-limited source catalog, then in the full one.We have managed not to suppress the small number of pairs having close-by but faint dwarf galaxy companions. The galaxy pair catalog lists the value of ρ for each isolated pair. This method allows the user of the catalog to select any isolation level (beyond the chosen limit ρ > 2.5). Our final catalog contains 13 114 galaxy pairs, of which 57% are fairly isolated withρ > 5, and 30% are highly isolated with ρ ≥ 10. |
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