91 citations · 377 across the 10 of their papers we have counts for
10 papers
The First Global e-Competition on Astronomy and Astrophysics
Ioana A. Zelko, Charles Barclay, Tonis Eenmae +7
The first Global e-Competition on Astronomy and Astrophysics was held online in September-October 2020 as a replacement for the International Olympiad on Astronomy and Astrophysics…
Galaxy Cluster Mass Reconstruction Project - IV. Understanding the effects of imperfect membership on cluster mass estimation
R. Wojtak, L. Old, G. A. Mamon +17
The primary difficulty in measuring dynamical masses of galaxy clusters from galaxy data lies in the separation between true cluster members from interloping galaxies along the lin…
Galaxy Cluster Mass Reconstruction Project: III. The impact of dynamical substructure on cluster mass estimates
L. Old, R. Wojtak, F. R. Pearce +14
With the advent of wide-field cosmological surveys, we are approaching samples of hundreds of thousands of galaxy clusters. While such large numbers will help reduce statistical un…
Simulations of Galaxy Cluster Collisions with a Dark Plasma Component
Christian Spethmann, Hardi Veermäe, Tiit Sepp +4
Dark plasma is an intriguing form of self-interacting dark matter with an effective fluid-like behavior, which is well motivated by various theoretical particle physics models. We…
Friends-of-friends galaxy group finder with membership refinement. Application to the local Universe
E. Tempel, R. Kipper, A. Tamm +4
Context. Groups form the most abundant class of galaxy systems. They act as the principal drivers of galaxy evolution and can be used as tracers of the large-scale structure and th…
Galaxy Cluster Mass Reconstruction Project: II. Quantifying scatter and bias using contrasting mock catalogues
L. Old, R. Wojtak, G. A. Mamon +21
This article is the second in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilise the positions, velocities…
Galaxy Cluster Mass Reconstruction Project: I. Methods and first results on galaxy-based techniques
L. Old, R. A. Skibba, F. R. Pearce +18
This paper is the first in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilise the positions, velocities an…
Groups in the Millennium Simulation and in SDSS DR7
P. Nurmi, P. Heinämäki, T. Sepp +6
The Millennium N-body simulation and the Sloan Digital Sky Survey seventh data release (SDSS DR7) galaxy and galaxy group catalogues are compared to study the properties of galaxy…
Galaxy structures - Groups, clusters and superclusters
Tiit Sepp, Mirt Gramann
We provide a brief summary of the history of galaxy structure studies. We also introduce several large-scale redshift surveys and summarize the most commonly used methods to identi…
Probing scalar particle and unparticle couplings in e+ e- -> t tbar with transversely polarized beams
S. Groote, H. Liivat, I. Ots +1
In searching for indications of new physics scalar particle and unparticle couplings in e^+ e^- \to t\bar t, we consider the role of transversely polarized initial beams at e^+ e^-…