Results 31 to 40 of about 144,349 (266)

Filaments of galaxies and Voronoi diagrams

Open Astronomy, 2018
The intersections between a spherical shell and the faces of Voronoi polyhedrons are numerically evaluated. The nodes of these intersections are the points that share the same distances from three nuclei.
Zaninetti Lorenzo
doaj   +1 more source

A statistical study of the luminosity gap in galaxy groups

, 2010
The luminosity gap between the two brightest members of galaxy groups and clusters is thought to offer a strong test for the models of galaxy formation and evolution.
Ghanbari, Jamshid, Khosroshahi, Habib G., Koohpaee, Ali, Rahmani, Hadi, Tavasoli, Saeed   +4 more
core   +1 more source

Effects of Quasar Feedback in Galaxy Groups [PDF]

, 2008
We study the effect of quasar feedback on distributions of baryons and properties of intracluster medium in galaxy groups using high-resolution numerical simulations. We use the entropy-conserving Gadget code that includes gas cooling and star formation,
Allen, Allen, Arthur Kosowsky, Bhattacharya, Bialek, Bondi, Bondi, Borgani, Borgani, Chatterjee, Croston, Di Matteo, Di Matteo, Di Matteo, Eke, Ettori, Ettori, Ettori, Ettori, Evrard, Evrard, Fabian, Finoguenov, Fowler, Frenk, Heinz, Hernandez-Monteagudo, Hernquist, Hoyle, Jetha, Kaiser, Katz, Kay, Kay, Khalatyan, Komatsu, Kosowsky, Lubin, Maturi, Metzler, Mohr, Mohr, Monaghan, Muanwong, Nagai, Nath, Navarro, Nulsen, Pointecouteau, Ponman, Popesso, Roncarelli, Ruhl, Sanderson, Sanderson, Scannapieco, Scannapieco, Sehgal, Sehgal, Shakura, Sijacki, Sijacki, Spergel, Springel, Springel, Springel, Suman Bhattacharya, Sunyaev, Tago, Thacker, Tiziana Di Matteo, Valageas, Valdarnini, Vikhlinin, White, Willis   +75 more
core   +1 more source

Groups of Galaxies [PDF]

Highlights of Astronomy, 1977
I would like to report on some work that Ed Turner and I have done on groups of galaxies and how groups may be used to obtain useful cosmological information. Of course the classic study of groups of galaxies was done by de Vaucouleurs (1975) who made a catalogue of groups and loose associations of galaxies in the local supercluster. Partly to obtain a
openaire   +1 more source

Correlation Function of Galaxy Groups

, 2000
We use the Updated Zwicky Catalog of galaxies (Falco et al. 1999) to generate a catalog of groups, by means of a friend-of-friend algorithm. The correlation length of the total sample is well fitted with a power law $ \xi(r)=(r/r_0)^\gamma $ with ...
Barrow J. D., Croft R. A. C., Diego G. Lambas, Girardi M., Jing Y., Manuel E. Merchan, Marcio A. G. Maia, Nolthenius R.   +7 more
core   +1 more source

Nearby Optical Galaxies: Selection of the Sample and Identification of Groups [PDF]

, 2000
In this paper we describe the Nearby Optical Galaxy (NOG) sample, which is a complete, distance-limited ($cz\leq$6000 km/s) and magnitude-limited (B$\leq$14) sample of $\sim$7000 optical galaxies.
Armando Pisani, Binggeli B., Christian Marinoni, Epchtein N., Escalera E., Focardi P., Fouque P., Garcia A. M., Giuliano Giuricin, Gourgoulhon E., Hermit S., Hudson M. J., Hudson M. J., Hudson M. J., Hudson M. J., Lorenzo Ceriani, Materne J., Moore B., Nolthenius R., Pisani A., Ramella M., Ramella M., Trasarti-Battistoni R., Vennik J., Webster M.   +24 more
core   +2 more sources

Isolated Galaxies, Pairs and Groups of Galaxies [PDF]

International Astronomical Union Colloquium, 1990
We searched for isolated galaxies, pairs and groups of galaxies in the CfA survey (Huchra et al. 1983). It was assumed that the distances to galaxies are given by R = V/H0, where H0 = 100 km s−1 Mpc−1 and R> 6 Mpc.
I. Kuneva, M. Kalinkov
openaire   +1 more source

Satellite Luminosities in Galaxy Groups

, 2007
Halo model interpretations of the luminosity dependence of galaxy clustering assume that there is a central galaxy in every sufficiently massive halo, and that this central galaxy is very different from all the others in the halo.
Martino, Matthew C., Sheth, Ravi K., Skibba, Ramin A.   +2 more
core   +3 more sources

Mass segregation trends in SDSS galaxy groups [PDF]

, 2014
It has been shown that galaxy properties depend strongly on their host environment. In order to understand the relevant physical processes driving galaxy evolution it is important to study the observed properties of galaxies in different environments ...
Evans, Fraser A., Joshi, Gandhali D., Parker, Laura C., Roberts, Ian D.   +3 more
core   +1 more source

Galaxy groups and the modified dynamics

, 1998
I estimate Modified-Dynamics (MOND), median M/L values for recently published catalogues of galaxy groups. While the median, Newtonian M/L values quoted for these catalogues are 110-200 solar units, the corresponding values for MOND are less than 10 ...
Begeman K. G., Milgrom M., Mordehai Milgrom, Nolthenius R.   +3 more
core   +1 more source