Reference : Low density structures in the local universe. I. Diffuse agglomerates of galaxies
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/143770
Low density structures in the local universe. I. Diffuse agglomerates of galaxies
English
Karachentsev, I.D. []
Karachentseva, V.E. []
Melnyk, Olga mailto []
Elyiv, Andrii mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Makarov, D.I. []
Oct-2012
Astrophysical Bulletin
Springer
67
4
353-361
Yes (verified by ORBi)
International
1990-3413
1990-3421
Moscow
Russia
[en] cosmology ; large-scale structure of Universe
[en] This paper is the first of a series considering the properties of distribution of nearby galaxies in the low density regions. Among 7596 galaxies with radial velocities V_{LG}<3500 km/s, absolute magnitudes M_K<-18.4^m$, and Galactic latitudes |b| >15 degr there are 3168 field galaxies (i.e. 42%) that do not belong to pairs, groups or clusters in the Local universe. Applying to this sample the percolation method with a radius of r_0=2.8 Mpc, we found 226 diffuse agglomerates with n>=4 number of members. The structures of eight most populated objects among them (n>=25) are discussed. These non-virialized agglomerates are characterized by a median dispersion of radial velocities of about 170 km/s, the linear size of around 6 Mpc, integral K-band luminosity of 3*10^{11} L_sun, and a formal virial-mass-to-luminosity ratio of about 700 M_sun/L_sun. The mean density contrast for the considered agglomerates is only <Delta n/\bar{n}\gtrsim 5, and their crossing time is about 30-40 Gyr.
http://hdl.handle.net/2268/143770
10.1134/S1990341312040013

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