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Structure and dynamics of the supercluster of galaxies SC0028-0005 | | Ana Laura O'Mill
; Dominique Proust
; Hugo V C.apelato
; Mirian Castejon
; Eduardo S. Cypriano
; Gastão B. Lima Neto
; Laerte Sodré Jr
; | | Date: |
29 Jul 2015 | | Abstract: | According to the standard cosmological scenario, superclusters are objects
that have just passed the turn around point and are collapsing. The dynamics of
very few superclusters have been analysed up to now. In this paper we study the
supercluster SC0028-0005, at redshift 0.22, identify the most prominent groups
and/or clusters that make up the supercluster, and investigate the dynamic
state of this structure. For the membership identification, we have used
photometric and spectroscopic data from SDSS-DR10, finding 6 main structures in
a flat spatial distribution. We have also used a deep multi-band observation
with MegaCam/CFHT to estimate de mass distribution through the weak-lensing
effect. For the dynamical analysis, we have determined the relative distances
along the line of sight within the supercluster using the Fundamental Plane of
early-type galaxies. Finally, we have computed the peculiar velocities of each
of the main structures. The 3D distribution suggests that SC0028-005 is indeed
a collapsing supercluster, supporting the formation scenario of these
structures. Using the spherical collapse model, we estimate that the mass
within $r = 10$~Mpc should lie between 4 and $16 imes 10^{15} M_odot$. The
farthest detected members of the supercluster suggest that within $sim 60$~Mpc
the density contrast is $delta sim 3$ with respect to the critical density at
$z=0.22$, implying a total mass of $sim 4.6$--$16 imes 10^{17} M_odot$,
most of which in the form of low-mass galaxy groups or smaller substructures. | | Source: | arXiv, 1507.8301 | | Services: | Forum | Review | PDF | Favorites | |
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