Article (Scientific journals)
Low density structures in the local universe. I. Diffuse agglomerates of galaxies
Karachentsev, I.D.; Karachentseva, V.E.; Melnyk, Olga et al.
2012In Astrophysical Bulletin, 67 (4), p. 353-361
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Keywords :
cosmology; large-scale structure of Universe
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Karachentsev, I.D.
Karachentseva, V.E.
Melnyk, Olga
Elyiv, Andrii ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Makarov, D.I.
Language :
English
Title :
Low density structures in the local universe. I. Diffuse agglomerates of galaxies
Publication date :
October 2012
Journal title :
Astrophysical Bulletin
ISSN :
1990-3413
eISSN :
1990-3421
Publisher :
Springer, Moscow, Russia
Volume :
67
Issue :
4
Pages :
353-361
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 February 2013

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