2002A&A...381..420A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET20:22:55

2002A&A...381..420A - Astronomy and Astrophysics, volume 381, 420-427 (2002/1-2)

Group analysis in the SSRS2 catalog.

ADAMI C. and MAZURE A.

Abstract (from CDS):

We present an automated method to detect populations of groups in galaxy redshift catalogs. This method uses both analysis of the redshift distribution along lines of sight in fixed cells to detect elementary structures and a friend-of-friend algorithm to merge these elementary structures into physical structures. We apply this method to the SSRS2 galaxy redshift catalog. The groups detected with our method are similar to group catalogs detected with pure friend-of-friend algorithms. They have similar mass distribution, similar abundance versus redshift, a similar 2-point correlation function (modeled by a power law: (r/r0)γ with r0=7h–1Mpc and γ=-1.79) and the same redshift completeness limit, close to 5000km/s. If instead of SSRS2, we use catalogs of the new generation (deep redshift surveys obtained with 10m class telescopes), it would lead to a completeness limit of z∼0.7. We model the luminosity function for nearby galaxy groups by a Schechter function with parameters MSSRS2*=(-19.99±0.36)+5logh and α=-1.46±0.17 to compute the mass to light ratio. The median value of the mass to light ratio is 360hM/L (in the SSRS2 band, close to a B band magnitude) and we deduce a relation between mass to light ratio and velocity dispersion σ (M/L=(3.79±0.64)σ-(294±570)). The more massive the group, the higher the mass to light ratio, and therefore, the larger the amount of dark matter inside the group. Another explanation is a significant stripping of the gas of the galaxies in massive groups as opposed to low mass groups. This extends to groups of galaxies the mild tendency already detected for rich clusters of galaxies. Finally, we detect a barely significant fundamental plane for these groups (L∝RVir2.26±1.392.93±1.64 for groups with more than 8 galaxies) but it is much less narrow than for clusters of galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - cosmology: large-scale structure of Universe

VizieR on-line data: <Available at CDS (J/A+A/381/420): tables.dat>

Nomenclature: Tables 1, 2: [AM2002] DDD.dddd+DD.dddd N=80.

Simbad objects: 80

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Number of rows : 80

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [AM2002] 003.2488-24.3504 GrG 00 12 59.7 -24 21 01           ~ 1 0
2 [AM2002] 003.2868-07.4360 GrG 00 13 08.8 -07 26 10           ~ 1 0
3 [AM2002] 005.5908-04.3517 GrG 00 22 21.8 -04 21 06           ~ 1 0
4 [AM2002] 006.8999-09.0373 GrG 00 27 36.0 -09 02 14           ~ 1 0
5 [AM2002] 007.0446-37.3208 GrG 00 28 10.7 -37 19 15           ~ 1 0
6 [AM2002] 007.1985-22.9825 GrG 00 28 47.6 -22 58 57           ~ 1 0
7 [AM2002] 007.3508-10.9007 GrG 00 29 24.2 -10 54 03           ~ 1 0
8 [AM2002] 008.0602-03.3412 GrG 00 32 14.4 -03 20 28           ~ 1 0
9 [AM2002] 008.4047-28.5031 GrG 00 33 37.1 -28 30 11           ~ 1 0
10 [AM2002] 008.8372-23.7145 GrG 00 35 20.9 -23 42 52           ~ 1 0
11 [AM2002] 010.6675-09.3056 GrG 00 42 40.2 -09 18 20           ~ 1 0
12 [AM2002] 012.7327-13.4234 GrG 00 50 55.8 -13 25 24           ~ 1 0
13 [AM2002] 014.2872-09.1834 GrG 00 57 08.9 -09 11 00           ~ 1 0
14 [AM2002] 018.0011-32.3378 GrG 01 12 00.3 -32 20 16           ~ 1 0
15 [AM2002] 018.0096-06.6967 GrG 01 12 02.3 -06 41 48           ~ 1 0
16 [AM2002] 020.7478-35.3655 GrG 01 22 59.5 -35 21 56           ~ 1 0
17 [AM2002] 020.7672-38.5622 GrG 01 23 04.1 -38 33 44           ~ 1 0
18 [AM2002] 025.2701-34.4858 GrG 01 41 04.8 -34 29 09           ~ 1 0
19 [AM2002] 025.3051-04.2930 GrG 01 41 13.2 -04 17 35           ~ 1 0
20 [AM2002] 026.2856-13.8575 GrG 01 45 08.5 -13 51 27           ~ 1 0
21 [AM2002] 028.2577-04.2047 GrG 01 53 01.8 -04 12 17           ~ 1 0
22 [AM2002] 028.7924-09.3172 GrG 01 55 10.2 -09 19 02           ~ 1 0
23 [AM2002] 029.5184-25.5656 GrG 01 58 04.4 -25 33 56           ~ 1 0
24 [AM2002] 030.2063-32.1871 GrG 02 00 49.5 -32 11 14           ~ 1 0
25 [AM2002] 030.6148-29.3072 GrG 02 02 27.6 -29 18 26           ~ 1 0
26 [AM2002] 031.4930-06.8843 GrG 02 05 58.3 -06 53 03           ~ 1 0
27 [AM2002] 031.5281-23.1068 GrG 02 06 06.7 -23 06 24           ~ 1 0
28 [AM2002] 034.8054-38.3532 GrG 02 19 13.3 -38 21 12           ~ 1 0
29 [AM2002] 036.4329-11.4888 GrG 02 25 43.9 -11 29 20           ~ 1 0
30 [AM2002] 039.0671-13.1909 GrG 02 36 16.1 -13 11 27           ~ 1 0
31 [AM2002] 040.8864-25.7116 GrG 02 43 32.7 -25 42 42           ~ 1 0
32 [AM2002] 041.4914-31.8348 GrG 02 45 57.9 -31 50 05           ~ 2 0
33 [AM2002] 042.5306-08.9778 GrG 02 50 07.3 -08 58 40           ~ 1 0
34 [AM2002] 046.6818-10.4633 GrG 03 06 43.6 -10 27 48           ~ 1 0
35 [AM2002] 047.4664-25.3934 GrG 03 09 51.9 -25 23 36           ~ 1 0
36 [AM2002] 048.1498-07.5486 GrG 03 12 36.0 -07 32 55           ~ 1 0
37 [AM2002] 049.0948-04.7276 GrG 03 16 22.8 -04 43 39           ~ 1 0
38 [AM2002] 052.7168-04.8493 GrG 03 30 52.0 -04 50 57           ~ 1 0
39 [AM2002] 053.8719-18.4927 GrG 03 35 29.3 -18 29 34           ~ 1 0
40 [AM2002] 055.2961-04.5489 GrG 03 41 11.1 -04 32 56           ~ 1 0
41 [AM2002] 149.4540-02.7081 GrG 09 57 49.0 -02 42 29           ~ 1 0
42 [AM2002] 150.3229-06.2040 GrG 10 01 17.5 -06 12 14           ~ 1 0
43 [AM2002] 151.6062-02.4202 GrG 10 06 25.5 -02 25 13           ~ 1 0
44 [AM2002] 155.7194-02.3807 GrG 10 22 52.7 -02 22 51           ~ 1 0
45 [AM2002] 160.6563-10.2180 GrG 10 42 37.5 -10 13 05           ~ 1 0
46 [AM2002] 162.5583-12.2600 GrG 10 50 14.0 -12 15 36           ~ 1 0
47 [AM2002] 164.2253-09.5503 GrG 10 56 54.1 -09 33 01           ~ 1 0
48 [AM2002] 165.7276-14.5042 GrG 11 02 54.6 -14 30 15           ~ 1 0
49 [AM2002] 168.0586-13.6485 GrG 11 12 14.1 -13 38 55           ~ 1 0
50 [AM2002] 170.6570-13.4858 GrG 11 22 37.7 -13 29 09           ~ 1 0
51 [AM2002] 171.4233-11.2592 GrG 11 25 41.6 -11 15 33           ~ 1 0
52 [AM2002] 175.3333-11.9775 GrG 11 41 20.0 -11 58 39           ~ 1 0
53 [AM2002] 179.4168-20.3306 GrG 11 57 40.0 -20 19 50           ~ 1 0
54 [AM2002] 184.8120-12.4777 GrG 12 19 14.9 -12 28 40           ~ 1 0
55 [AM2002] 190.5120-20.5779 GrG 12 42 02.9 -20 34 40           ~ 1 0
56 [AM2002] 191.9568-04.7924 GrG 12 47 49.6 -04 47 33           ~ 1 0
57 [AM2002] 192.5408-26.9663 GrG 12 50 09.8 -26 57 59           ~ 1 0
58 [AM2002] 192.5900-13.3802 GrG 12 50 21.6 -13 22 49           ~ 1 0
59 [AM2002] 193.6383-20.2686 GrG 12 54 33.2 -20 16 07           ~ 1 0
60 [AM2002] 195.6448-04.6870 GrG 13 02 34.8 -04 41 13           ~ 1 0
61 [AM2002] 199.7299-16.4609 GrG 13 18 55.2 -16 27 39           ~ 1 0
62 [AM2002] 200.9558-11.9613 GrG 13 23 49.4 -11 57 41           ~ 1 0
63 [AM2002] 201.6564-20.3991 GrG 13 26 37.5 -20 23 57           ~ 1 0
64 [AM2002] 201.9665-01.8782 GrG 13 27 52.0 -01 52 42           ~ 1 0
65 [AM2002] 201.9803-21.4628 GrG 13 27 55.3 -21 27 46           ~ 1 0
66 [AM2002] 202.8497-24.7016 GrG 13 31 23.9 -24 42 06           ~ 1 0
67 [AM2002] 229.1948-13.2268 GrG 15 16 46.8 -13 13 36           ~ 1 0
68 [AM2002] 318.7207-23.0257 GrG 21 14 53.0 -23 01 33           ~ 1 0
69 [AM2002] 329.3656-33.4588 GrG 21 57 27.7 -33 27 32           ~ 1 0
70 [AM2002] 331.6321-27.8423 GrG 22 06 31.7 -27 50 32           ~ 1 0
71 [AM2002] 332.2561-27.0691 GrG 22 09 01.5 -27 04 09           ~ 1 0
72 [AM2002] 332.4736-22.8598 GrG 22 09 53.7 -22 51 35           ~ 1 0
73 [AM2002] 332.6806-30.0202 GrG 22 10 43.3 -30 01 13           ~ 1 0
74 [AM2002] 332.9872-27.7711 GrG 22 11 56.9 -27 46 16           ~ 1 0
75 [AM2002] 333.7648-21.2985 GrG 22 15 03.6 -21 17 55           ~ 1 0
76 [AM2002] 335.6633-31.4416 GrG 22 22 39.2 -31 26 30           ~ 1 0
77 [AM2002] 341.0783-22.2565 GrG 22 44 18.8 -22 15 23           ~ 1 0
78 [AM2002] 343.0948-34.2753 GrG 22 52 22.8 -34 16 31           ~ 1 0
79 [AM2002] 356.4653-28.3663 GrG 23 45 51.7 -28 21 59           ~ 1 0
80 [AM2002] 357.4948-29.5501 GrG 23 49 58.8 -29 33 00           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-20:22:55

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