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24 April 2024 |
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Toward understanding rich superclusters | | M. Einasto
; E. Saar
; V.J. Martinez
; J. Einasto
; L. J. Liivam"agi
; E. Tago
; J.-L. Starck
; V. Mueller
; P. Hein"am"aki
; P. Nurmi
; S. Paredes
; M. Gramann
; G. Huetsi
; | | Date: |
2 Jun 2008 | | Abstract: | We present a morphological study of the two richest superclusters from the
2dF Galaxy Redshift Survey (SCL126, the Sloan Great Wall, and SCL9, the
Sculptor supercluster). We use Minkowski functionals, shapefinders, and galaxy
group information to study the substructure of these superclusters as formed by
different populations of galaxies. We compare the properties of grouped and
isolated galaxies in the core region and in the outskirts of superclusters. The
fourth Minkowski functional $V_3$ and the morphological signature $K_1$- $K_2$
show a crossover from low-density morphology (outskirts of supercluster) to
high-density morphology (core of supercluster) at mass fraction $m_f approx
0.7$. The galaxy content and the morphology of the galaxy populations in
supercluster cores and outskirts is different. The core regions contain a
larger fraction of early type, red galaxies, and richer groups than the
outskirts of superclusters. In the core and outskirt regions the fine structure
of the two prominent superclusters as delineated by galaxies from different
populations also differs. Our results suggest that both local (group/cluster)
and global (supercluster) environments are important in forming galaxy
morphologies and colors (and determining the star formation activity). The
differences between the superclusters indicate that these superclusters have
different evolutional histories (Abridged). | | Source: | arXiv, 0806.0325 | | Services: | Forum | Review | PDF | Favorites | |
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