The structure of supervoids. I. Void hierarchy in the Northern Local Supervoid (original) (raw)
1995, Astron Astrophys
Supervoids are regions in the local Universe which do not contain rich clusters of galaxies. In order to investigate the distribution of galaxies in and around supervoids, we have studied the closest example, the Northern Local Void. It is defined as the region between the Local, Coma, and the Hercules superclusters, which is well covered by available redshift surveys. We find that this supervoid is not empty, but it contains small galaxy systems and poor clusters of galaxies. We study the cosmography of this void by analyzing the distribution of poor clusters of galaxies, elliptical and other galaxies in two projections. We present a catalogue of voids, defined by galaxies of different morphological type and luminosity, and analyze mean diameters of voids in different environments. This analysis shows that sizes of voids and properties of void walls are related. Voids defined by poor clusters of galaxies and by bright elliptical galaxies have a mean diameter of up to 40h^-1^Mpc. Faint late-type galaxies divide these voids into smaller voids. The faintest galaxies we can study are outlining voids with mean diameters of about 8h^-1^Mpc. Voids located in a high-density environment are smaller than voids in low-density regions. The dependence of void diameters on the type and luminosity of galaxies, as well as on the large-scale environment shows that voids form a hierarchical system.
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Eprint Arxiv Astro Ph 9711046, 1997
The Northern Local Void is a huge underdense region of the nearby Universe situated between the Hercules, Coma and Local Superclusters. We present an investigation of the galaxy distribution in the Northern Local Void using void statistics. In particular galaxies of different morphological type and luminosity have been studied separately and void catalogues have been compiled from three different luminosity limited galaxy samples for the first time. Our approach is complementary to most other methods usually used in Large-Scale Structure studies and has the potential to detect and describe subtle structures in the galaxy distribution. We found that the resulting sets of voids form a hierarchical system: The fainter the limiting luminosity of the galaxies the smaller are the voids defined by them. Voids outlined by bright galaxies are interlaced by a fine network of faint galaxy filaments dividing them into smaller subvoids. This Void Hierarchy is an important property of the Large-Scale Structure in the Universe which constrains any realistic galaxy and structure formation scenario. In addition, this concept of Void Hierarchy may help to devise new concepts for the study of the Large-Scale Structure in the Universe.
Local and large-scale effects on the astrophysics of void galaxies
Monthly Notices of the Royal Astronomical Society
Galaxies in cosmic voids have been reported with properties related to a delayed evolution compared to the rest of the Universe. These characteristics reflect the interaction of galaxies with the environment. However, it is not clear the degree of influence of the large-scale structure on the properties of void galaxies or if these are only influenced by the low local density around them typical of these regions. In this article, we identified cosmic voids in the SDSS-DR16 and studied the g–r colour, star formation rate, and concentration of galaxies. We identified galaxy groups to characterize the local environment and studied the properties of galaxies as a function of total and stellar masses, separately analysing those in voids and the general sample. Our results show that galaxies that inhabit haloes of a given mass (below sim1013.5rmModot{\sim}10^{13.5}{\rm M}_{\odot }sim1013.5rmModot), are bluer, have a higher star formation rate and are less concentrated when the host halo is inside voids compared to oth...
Local Cells of the Universe: Two Voids of Diameter 200 MPC
Highlights of Astronomy, 1983
Recent studies of the spatial distribution of galaxies and of clusters indicate that practically all clusters and a vast majority of galaxies are concentrated into supercusters. The space between superclusters has no rich clusters and very few galaxies. The whole structure is cellular, with cell walls formed from sheetlike superclusters and the empty cell interiors being huge voids.In this presentation we show how the observed distribution of clusters, and the Local Supercluster in particular, are part of a cellular structure and suggest that the entire pattern of superclustering is cellular. Our study is based on the recently completed CFA redshift survey. All other available redshifts are also used, including cluster redshifts where available.
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