J/other/AstBu/73.310 Isolated galaxy pair limited to M≤-18.5 (Nottale+, 2018)
A catalog of isolated galaxy pairs limited to absolute magnitude -18.5 drawn
from HyperLEDA database.
Nottale L., Chamaraux P.
<Astrophys. Bull., 73, 310-317 (2018)>
=2018AstBu..73..310N 2018AstBu..73..310N (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Clusters, galaxy ; Radial velocities
Keywords: catalogues - galaxies: general - galaxies: groups: general
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. 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<500km/s; 2) Interdistance
criterion: projected distance between the members rp<1Mpc; 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 500km/s with respect to the pair) and the
members projected interdistance r_p 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 13114 galaxy pairs, of which 57% are fairly isolated
with ρ>5, and 30% are highly isolated with ρ≥10.
Description:
We present a catalog of 13114 isolated pairs of galaxies limited to
absolute magnitude -18.5 selected from HyperLEDA database.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 106 13114 The isolated galaxy pair catalog
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See also:
J/other/AstBu/71.270 : The UGC isolated galaxy pair catalog (Chamaraux+, 2016)
http://leda.univ-lyon1.fr/ : HyperLEDA extragalactic database
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 h RA1hour Right ascension of the first galaxy
of the pair (J2000.0)
10- 18 F9.5 deg DE1deg Declination of the first galaxy
of the pair (J2000.0)
20- 25 F6.2 mag BMAG1 B-band absolute magnitude of the first galaxy
of the pair
27- 31 I5 km/s HRV1 Heliocentric radial velocity of the first
galaxy of the pair
33- 38 I6 km/s e_HRV1 Uncertainty on HRV1 (km/s)
40- 47 F8.5 h RA2hour Right ascension of the second galaxy
of the pair (J2000.0)
49- 57 F9.5 deg DE2deg Declination of the second galaxy
of the pair (J2000.0)
59- 64 F6.2 mag BMAG2 B-band absolute magnitude of the second galaxy
of the pair
66- 70 I5 km/s HRV2 Heliocentric radial velocity of the second
galaxy of the pair
72- 74 I3 km/s e_HRV2 Uncertainty on HRV2
76- 78 I3 km/s DHRV Absolute value of the radial velocity
difference between the pair members
80- 85 I6 km/s e_DHRV Uncertainty on DHRV
87- 91 F5.3 Mpc rp Interdistance projected on the sky plane
between the two pair members (1)
93- 94 A2 --- l_rho [≥ ] Limit flag on rho
95- 99 F5.2 --- rho Ratio between the distance of the closest
galaxy to the pair center and rp (2)
101-106 F6.2 mag BMAG3 ?=0 B-band absolute magnitude of the closest
galaxy to the pair (3)
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Note (1): The projected interdistance between pair members is computed from
their angular separation on the sky plane and the distance of the pair
derived from the mean value of their distance modulus modz in HyperLEDA
database.
Note (2): A value 10. in the table means that ρ≥10.
Note (3): A value 0. in the table means that the absolute magnitude of the
closest galaxy to the pair is missing in the HyperLEDA database.
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Acknowledgements:
Laurent Nottale, laurent.nottale(at)obspm.fr
Pierre Chamaraux, pierre.chamaraux(at)obspm.fr
(End) Patricia Vannier [CDS] 30-May-2018