48,091 research outputs found
Intra-group diffuse light in compact groups of galaxies. HCG 79, HCG 88 and HCG 95
Deep and images of three Hickson Compact Groups, HCG 79, HCG 88 and
HCG 95, were analyzed using a new wavelet technic to measure possible
intra-group diffuse light present in these systems. The method used, OV\_WAV,
is a wavelet technic particularly suitable to detect low-surface brightness
extended structures, down to a per pixel, which corresponds to a
5--detection level in wavelet space. The three groups studied are in
different evolutionary stages, as can be judged by their very different
fractions of the total light contained in their intra-group halos: %
for HCG 79 and % for HCG 95, in the band, and HCG 88 had no
component detected down to a limiting surface brightness of . For HCG 95 the intra-group light is red, similar to the mean
colors of the group galaxies themselves, suggesting that it is formed by an old
population with no significant on-going star formation. For HCG 79, however,
the intra-group material has significantly bluer color than the mean color of
the group galaxies, suggesting that the diffuse light may, at least in part,
come from stripping of dwarf galaxies which dissolved into the group potential
well.Comment: Two suggested references added to the introductio
A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms
This paper describes a flexible architecture for implementing a new fast
computation of the discrete Fourier and Hartley transforms, which is based on a
matrix Laurent series. The device calculates the transforms based on a single
bit selection operator. The hardware structure and synthesis are presented,
which handled a 16-point fast transform in 65 nsec, with a Xilinx SPARTAN 3E
device.Comment: 4 pages, 4 figures. IEEE VI Southern Programmable Logic Conference
201
Susceptibility of a two-level atom near an isotropic photonic band edge: transparency and band edge profile reconstruction
We discuss the necessary conditions for a two-level system in the presence of
an isotropic band edge to be transparent to a probe laser field. The two-level
atom is transparent whenever it is coupled to a reservoir constituted of two
parts - a flat and a non-flat density of modes representing a PBG structure. A
proposal on the reconstruction of the band edge profile from the experimentally
measured susceptibility is also presented.Comment: 15 pages, 3 figure
Characterization and quantification of symmetric Gaussian state entanglement through a local classicality criterion
A necessary and sufficient condition for characterization and quantification
of entanglement of any bipartite Gaussian state belonging to a special symmetry
class is given in terms of classicality measures of one-party states. For
Gaussian states whose local covariance matrices have equal determinants it is
shown that separability of a two-party state and classicality of one party
state are completely equivalent to each other under a nonlocal operation,
allowing entanglement features to be understood in terms of any available
classicality measure.Comment: 5 pages, 1 figure. Replaced with final published versio
Lattice Simulation of Nuclear Multifragmentation
Motivated by the decade-long debate over the issue of criticality supposedly
observed in nuclear multifragmentation, we propose a dynamical lattice model to
simulate the phenomenon. Its Ising Hamiltonian mimics a short range attractive
interaction which competes with a thermal-like dissipative process. The results
here presented, generated through an event-by-event analysis, are in agreement
with both experiment and those produced by a percolative (non-dynamical) model.Comment: 8 pages, 3 figure
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