J/A+A/336/35 Shape and orientation of superclusters (Jaaniste+, 1998)
The supercluster-void network. IV. The shape and orientation of superclusters.
Jaaniste J., Tago E., Einasto M., Einasto J., Andernach H., Mueller V.
<Astron. Astrophys. 336, 35 (1998)>
=1998A&A...336...35J 1998A&A...336...35J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy
Keywords: galaxies: clusters: general - cosmology: observations -
cosmology: large-scale structure of the Universe
Abstract:
We present a study of the shape, size, and spatial orientation of
superclusters of galaxies. Approximating superclusters by triaxial
ellipsoids we show that superclusters are flattened, triaxial objects.
We find that there are no spherical superclusters. The sizes of
superclusters grow with their richness: the median semi-major axis of
rich and poor superclusters (having ≥8 and <8 member clusters) is 42
and 31h-1Mpc, respectively. Similarly, the median semi-minor axis is
12 and 5h-1Mpc for rich and poor superclusters. The spatial
orientation of superclusters, as determined from the axes of the
ellipsoids, is nearly random. We do not detect any preferable
orientation of superclusters, neither with respect to the line of
sight, nor relative to some other outstanding feature in the large
scale structure, nor with respect to the directions of principal axes
of adjacent superclusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 42 Shape and orientation of superclusters
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See also:
J/A+AS/123/119 : The supercluster-void network. I. (Einasto+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SCL Supercluster number, as in Cat. J/A+AS/123/119
5- 7 I3 --- nCl Number of clusters in supercluster
10- 14 F5.1 Mpc a First semiaxis of concentration ellipsoid
16- 20 F5.1 Mpc b Second semiaxis of concentration ellipsoid
22- 26 F5.1 Mpc c Third semiaxis of concentration ellipsoid
28- 33 F6.3 --- V/Vsph Ratio of ellipsoid to sphere volumes (bc/a2)
36- 38 I3 deg Xa Angle of a-axis with the supergalactic X-axis
40- 42 I3 deg Xc Angle of c-axis with the supergalactic X-axis
45- 47 I3 deg Ra Angle of a-axis with the line of sight
49- 51 I3 deg Rc Angle of c-axis with the line of sight
54- 58 F5.1 deg RAdeg *Right ascension (1950) of supercluster centre
60- 64 F5.1 deg DEdeg *Declination (1950) of supercluster centre
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Note on RAdeg, DEdeg: position taken from Cat. J/A+AS/123/119
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History:
* 21-Jul-1999: received from Heinz Andernach () who
prepared the table from the latex manuscript (9807044).
Equatorial coordinates were added to this table at CDS.
References:
Einasto, M., Tago, E., Jaaniste, J., Einasto, J., Andernach, H.,
1997A&AS..123..119E 1997A&AS..123..119E (Paper I)
Einasto, M., Frisch, P., Gottloeber, S., Mueller, V., Saar, V.,
Starobinsky, A.A., Tago, E., Tucker, D., Andernach, H.,
1997MNRAS.289..801E 1997MNRAS.289..801E (Paper II)
Einasto, M., Frisch, P., Gottloeber, S., Mueller, V., Saar, V.,
Starobinsky, A.A., Tucker, D., 1997MNRAS.289..813E 1997MNRAS.289..813E (Paper III)
(End) Heinz Andernach [Univ. Guanajuato], Francois Ochsenbein [CDS] 21-Jul-1999