Void Hierarchy — a Guiding Principle to the Study of Faint Structures in Voids

Lindner, U.; Einasto, J.; Einasto, M.; Fricke, K. J.

doi:10.1007/978-3-540-49709-7_58

Cited by 26 publications

(43 citation statements)

References 12 publications

(15 reference statements)

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“…This conclusion agrees with the results of earlier studies by Lindner et al (1996), Peebles (2001), and Gottlöber et al (2003) among others, that voids defined by relatively faint galaxy filaments are completely devoid of galaxies. Figure 6 shows that for a low DF cluster mass threshold, the void radii are almost independent of the mass threshold M th .…”

Section: Voids Defined By Clusters Of Different Masssupporting

confidence: 93%

“…1 for the luminosity density field of a spherical shell of the Sloan Digital Sky Survey). Dwarf galaxies define much smaller voids than giant ones (Einasto et al 1986(Einasto et al , 1989(Einasto et al , 1991Lindner et al 1995Lindner et al , 1996Gottlöber et al 2003;von Benda-Beckmann & Müller 2008). For the hierarchy of voids, we also refer to van de Weygaert & van Kampen (1993) To find the distribution of void radii, we used a simple void finder suggested by Einasto et al (1989).…”

Section: The Distribution Of Void Sizesmentioning

confidence: 99%

“…Supervoids are not empty but contain a hierarchy of voids, as demonstrated by many authors (Martel & Wasserman 1990;Lindner et al 1995;Gottlöber et al 2003;Aragón-Calvo et al 2007;von Benda-Beckmann & Müller 2008;Aragon-Calvo et al 2010a;Jones et al 2010). It is natural to expect that the web of rich superclusters is formed by density perturbations of scale 100 h −1 Mpc and above.…”

Section: Introductionmentioning

confidence: 95%

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The cosmic web for density perturbations of various scales

Suhhonenko

Einasto

Liivamägi

et al. 2011

A&A

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Aims. We follow the evolution of galaxy systems in numerical simulations. Our goal is to understand the role of density perturbations on various scales in the formation and evolution of the cosmic web. Methods. We perform numerical simulations with the full power spectrum of perturbations, and with a spectrum cut at long wavelengths. In addition, we have one model, where we cut the intermediate waves. We analyse the density field and study void sizes and density field clusters in different models. Results. Our analysis shows that the fine structure (groups and clusters of galaxies) are created by small-scale density perturbations of scale ≤8 h −1 Mpc. Filaments of galaxies and clusters are created by perturbations of intermediate scale from ∼8 to ∼32 h −1 Mpc, and superclusters of galaxies by larger perturbations. Conclusions. We conclude that the texture of the cosmic web is determined by density perturbations of the scales up to ∼100 h −1 Mpc. Larger perturbations do not change the texture of the web, but modulate the richness of galaxy systems, and make voids emptier.

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Section: Voids Defined By Clusters Of Different Masssupporting

confidence: 93%

Section: The Distribution Of Void Sizesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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The cosmic web for density perturbations of various scales

Suhhonenko

Einasto

Liivamägi

et al. 2011

A&A

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“…Similar results are reached by Lindner et al (1999). BCGs in or near voids are predominately found near the borders (Lindner et al 1996). The cases for other types of dwarfs, e.g.…”

Section: The Spatial Distribution Of Metal-poor Galaxiesmentioning

confidence: 95%

The most metal-poor galaxies

Kunth

Östlin

2000

Astronomy and Astrophysics Review

376

428

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Metallicity is a key parameter that controls many aspects in the formation and evolution of stars and galaxies. In this review we focus on the metal deficient galaxies, in particular the most metal-poor ones, because they play a crucial rôle in the cosmic scenery. We first set the stage by discussing the difficult problem of defining a global metallicity and how this quantity can be measured for a given galaxy. The mechanisms that control the metallicity in a galaxy are reviewed in detail and involve many aspects of modern astrophysics: galaxy formation and evolution, massive star formation, stellar winds, chemical yields, outflows and inflows etc. Because metallicity roughly scales as the galactic mass, it is among the dwarfs that the most metalpoor galaxies are found. The core of our paper reviews the considerable progress made in our understanding of the properties and the physical processes that are at work in these objects. The question on how they are related and may evolve from one class of objects to another is discussed. While discussing metal-poor galaxies in general, we present a more detailed discussion of a few very metal-poor blue compact dwarf galaxies like IZw18. Although most of what is known relates to our local universe, we show that it pertains to our quest for primeval galaxies and is connected to the question of the origin of structure in the universe. We discuss what QSO absorption lines and known distant galaxies tell us already? We illustrate the importance of star-forming metal-poor galaxies for the determination of the primordial helium abundance, their use as distance indicator and discuss the possibility to detect nearly metal-free galaxies at high redshift from Lyα emission.

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“…To calculate the separation between each isolated galaxy and its nearest neighboring SDSS galaxy, we introduce the concept of a distance field (Stavrev 1990). Such an approach has been applied also by Frisch et al (1995), Lindner et al (1995), and Aikio & Maehoenen (1998).…”

Section: Nearest Neighbor and Comparison With A Field Samplementioning

confidence: 99%

A Catalog of Very Isolated Galaxies from the Sloan Digital Sky Survey Data Release 1

et al. 2005

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We present a new catalog of isolated galaxies obtained through an automated systematic search. These 2980 isolated galaxies were found in %2099 deg 2 of sky in the Sloan Digital Sky Survey Data Release 1 (SDSS DR1) photometry. The selection algorithm, implementing a variation on the criteria developed by Karachentseva in 1973, proved to be very efficient and fast. This catalog will be useful for studies of the general galaxy characteristics. Here we report on our results.

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Void Hierarchy — a Guiding Principle to the Study of Faint Structures in Voids

Cited by 26 publications

References 12 publications

The cosmic web for density perturbations of various scales

The cosmic web for density perturbations of various scales

The most metal-poor galaxies

A Catalog of Very Isolated Galaxies from the Sloan Digital Sky Survey Data Release 1

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