J/A+A/578/A110 Isolated galaxies, pairs and triplets (Argudo-Fernandez+, 2015)
Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the
local Universe.
Argudo-Fernandez M., Verley S., Bergond G., Duarte Puertas S.,
Ramos Carmona E., Sabater J., Fernandez Lorenzo M., Espada D., Sulentic J.,
Ruiz J.E., Leon S.
<Astron. Astrophys. 578, A110 (2015)>
=2015A&A...578A.110A 2015A&A...578A.110A
ADC_Keywords: Galaxy catalogs ; Galaxies, nearby
Keywords: galaxies: general - galaxies: formation - galaxies: evolution
Abstract:
The construction of catalogues of galaxies and the posterior study of
galaxy properties in relation to their environment, have been hampered
by the scarce redshift information. The new 3-dimensional (3D) surveys
permit to distinguish small, faint, physically bound satellites from a
background projected galaxy population, giving a more comprehensive 3D
picture of the surroundings.
We aim to provide representative samples of isolated galaxies,
isolated pairs, and isolated triplets for testing galaxy evolution and
secular processes in low density regions of the local Universe, as
well as to characterise their local and large-scale environments.
We use spectroscopic data from the tenth data release of the Sloan
Digital Sky Survey (SDSS-DR10) to automatically and homogeneously
compile catalogues of 3,702 isolated galaxies, 1,240 isolated pairs,
and 315 isolated triplets in the local Universe (z≤0.080). To
quantify the effects of their local and large-scale environments, we
compute the projected density and the tidal strength for the brightest
galaxy in each sample.
We find evidence of isolated pairs and isolated triplets physically
bound at projected separation up to d≤450kpc with radial
velocity difference Δv≤160km/s, where the effect of the
companion typically accounts for more than 98% of the total tidal
strength affecting the central galaxy. For galaxies in the catalogues,
we provide their positions, redshifts, and degrees of relation with
their physical and large-scale environments. The catalogues are
publicly available to the scientific community.
For isolated galaxies, isolated pairs, and isolated triplets there is
no difference in their degree of interaction with the large-scale
structure (up to 5Mpc), which may suggest that they have a common
origin in their formation and evolution. We find that most of them
belong to the outer parts of filaments, walls, and clusters, and
generally differ from the void population of galaxies.
Description:
Catalogues of isolated galaxies, isolated pairs, and isolated triplets
in the local Universe with positions, redshifts, and degrees of
relation with their physical and large-scale environments.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 3702 SDSS-based catalogue of 3702 isolated galaxies (SIG)
in 3D and relation with the large-scale environment
table2.dat 34 2480 SDSS-based catalogue of 1240 isolated pairs (SIP)
in 3D
table3.dat 33 945 SDSS-based catalogue of 315 isolated triplets (SIT)
in 3D
table5.dat 38 1240 Isolated pairs: relation with their local and
large-scale environments
table6.dat 37 315 Isolated triplets: relation with their local and
large-scale environments
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See also:
J/AJ/129/2062 : SDSS DR1 isolated galaxies (Allam+, 2005)
J/AJ/136/2115 : SDSS/CIG galaxies classification (Hernandez-Toledo+, 2008)
J/other/RMxAA/47.361 : AGN activity in isolated SDSS galaxies (Coziol+, 2011)
J/A+A/560/A9 : AMIGA. Revision of the isolation degree
(Argudo-Fernandez+, 2013)
J/A+A/564/A94 : CIG sample 3-dimensional environment (Argudo-Fernandez+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- SIG [1/3702] Isolated galaxy identification
6- 14 F9.5 deg RAdeg J2000.0 Right Ascension in degrees
16- 24 F9.5 deg DEdeg J2000.0 Declination in degrees
26- 32 F7.5 --- z [0.005/0.08] Redshift of the galaxy
34- 36 I3 --- NLSS [0/249] Number of LSS associations
38 I1 --- f_NLSS [0/1] Footprint flag: '1' if the galaxy has a
5Mpc field radius in the SDSS footprint
40- 43 F4.2 Mpc dNN [1/5]?=- Distance to the first nearest
neighbour from 1Mpc to 5Mpc
45- 49 F5.2 [Mpc-3] kLSS [-3/0]?=- Projected density estimation of the LSS
51- 55 F5.2 --- QQLSS [-9.1/-2]?=- Tidal strength estimation of the LSS
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- SIP [1/1240] Isolated pair identification
6 I1 --- m_SIP [1/2] Index of the galaxy in the pair:
'1' for the A galaxy, '2' for the B galaxy
8- 16 F9.5 deg RAdeg J2000.0 Right Ascension in degrees
18- 26 F9.5 deg DEdeg J2000.0 Declination in degrees
28- 34 F7.5 --- z [0.005/0.08] Redshift of the galaxy
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SIT [1/315] Isolated triplet identification
5 I1 --- m_SIT [1/3] Index of the galaxy in the pair:
'1' for the A galaxy, '2' for the B galaxy,
'3' for the C galaxy
7- 15 F9.5 deg RAdeg J2000.0 Right Ascension in degrees
17- 25 F9.5 deg DEdeg J2000.0 Declination in degrees
27- 33 F7.5 --- z [0.005/0.08] Redshift of the galaxy
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- SIP [1/1240] Isolated pair identification
6- 8 I3 --- NLSS [0/199] Number of LSS associations
10 I1 --- f_NLSS [0/1] Footprint flag: '1' if the A galaxy has a
5Mpc field radius in the SDSS footprint
12- 15 F4.2 Mpc dNN [1/5]?=- Distance from the A galaxy to the first
nearest neighbour of the LSS (from 1Mpc to 5Mpc)
17- 21 F5.2 [Mpc-3] kLSS [-2.7/-0.1]?=- Projected density estimation of
the LSS
23- 27 F5.2 --- QQLSS [-9.2/-2]?=- Tidal strength estimation of the LSS
29- 33 F5.2 --- Qp [-6/3.1] Tidal strength estimation on the A
galaxy exerced by the B galaxy
35- 38 F4.2 --- Qratio [0.1/1]?=- Relation between Qpair and the total
tidal strengths on the A galaxy (Qtotal), from 0
to 1 if the isolated system amounts from 0% to
100% to the total tidal strength
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SIT [1/315] Isolated triplet identification
5- 7 I3 --- NLSS [1/115] Number of LSS associations
9 I1 --- f_NLSS [0/1] Footprint flag: '1' if the A galaxy has a
5Mpc field radius in the SDSS footprint
11- 14 F4.2 Mpc dNN [1/5] Distance from the A galaxy to the first
nearest neighbour of the LSS (from 1 to 5Mpc)
16- 20 F5.2 [Mpc-3] kLSS [-2.7/-0.2]?=- Projected density estimation of
the LSS
22- 26 F5.2 --- QQLSS [-7.4/-3.1] Tidal strength estimation of the LSS
28- 32 F5.2 --- Qt [-5/2.1] Tidal strength estimation on the A
galaxy exerced by the B and C galaxies
34- 37 F4.2 --- Qratio [0.7/1] Relation between Qtriplet and the total
tidal strengths on the A galaxy (Qtotal), from 0
to 1 if the isolated system amounts from 0% to
100% to the total tidal strength
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Acknowledgements:
Maria del Carmen Argudo Fernandez, margudo(at)shao.ac.cn
(End) Patricia Vannier [CDS] 08-Apr-2015