8,250 research outputs found
Non-Abelian Monopoles as the Origin of Dark Matter
We suggest that dark matter may be partially constituted by a dilute 't
Hooft-Polyakov monopoles gas. We reach this conclusion by using the
Georgi-Glashow model coupled to a dual kinetic mixing term where is the electromagnetic field and the 't Hooft tensor.
We show that these monopoles carry both (Maxwell) electric and (Georgi-Glashow)
magnetic charges and the electric charge quantization condition is modified in
terms of a dimensionless real parameter. This parameter could be determined
from milli-charged particle experiments.Comment: 5 pp, no figure
Indications of a Large Fraction of Spectroscopic Binaries Among Nuclei of Planetary Nebulae
Previous work indicates that about 10% of planetary-nebula nuclei (PNNi) are
photometrically variable short-period binaries with periods of hours to a few
days. These systems have most likely descended from common-envelope (CE)
interactions in initially much wider binaries. Population-synthesis studies
suggest that these very close pairs could be the short-period tail of a much
larger post-CE binary population with periods of up to a few months. We have
initiated a radial-velocity (RV) survey of PNNi with the WIYN 3.5-m telescope
and Hydra spectrograph, which is aimed at discovering these intermediate-period
binaries. We present initial results showing that 10 out of 11 well-observed
PNNi have variable RVs, suggesting that a significant binary population may be
present. However, further observations are required because we have as yet been
unable to fit our sparse measurements with definite orbital periods, and
because some of the RV variability might be due to variations in the stellar
winds of some of our PNNi.Comment: 11 pages, 1 table, no figures. Accepted by the Astrophysical Journal
Letter
A catalog of planetary nebulae in the elliptical galaxy NGC 4697
We present a catalog of 535 planetary nebulae discovered in the flattened
elliptical galaxy NGC 4697, using the FORS1 Cassegrain spectrograph of the Very
Large Telescope of the European Southern Observatory at Cerro Paranal, Chile.
The catalog provides positions (x, y coordinates relative to the center of
light of NGC 4697, as well as RA, Dec.), and, for almost all PNs, the magnitude
m(5007) and the heliocentric radial velocity in km/s.Comment: 16 pages, 5 figures, ApJS in pres
The structures underlying soliton solutions in integrable hierarchies
We point out that a common feature of integrable hierarchies presenting
soliton solutions is the existence of some special ``vacuum solutions'' such
that the Lax operators evaluated on them, lie in some abelian subalgebra of the
associated Kac-Moody algebra. The soliton solutions are constructed out of
those ``vacuum solitons'' by the dressing transformation procedure.Comment: Talk given at the I Latin American Symposium on High Energy Physics,
I SILAFAE, Merida, Mexico, November/96, 5 pages, LaTeX, needs aipproc.tex,
aipproc.sty, aipproc.cls, available from
ftp://ftp.aip.org/ems/tex/macros/proceedings/6x9
The Survival of Planetary Nebulae in the Intracluster Medium
The stellar population stripped from galaxies in clusters evolve under the
extreme conditions imposed by the intracluster (IC) medium. Intracluster stars
generally suffer very high systemic velocities, and evolve within a rarefied
and extremely hot IC medium. We present numerical simulations which aim to
explore the evolution and survival of IC Asymptotic Giant Branch (AGB)
envelopes and Planetary Nebula (PN) shells. Our models reflect the evolution of
a low-mass star under the observed conditions in the Virgo IC medium. We find
that the integrated hydrogen-recombination line emission of a PN is dominated
by the inner dense shell, whose evolution is unaffected by the environment. Ram
pressure stripping affects mainly the outermost IC PN shell, which hardly
influences the emission when the PN is observed as a point source. More
importantly, we find that a PN with progenitor mass of 1 Msun fades to ~30% and
10% of its maximum emission, in 5,000 and 10,000 yr respectively, disclosing an
actual PN lifetime t_PN several times shorter to what is usually adopted
(25,000 yr). This result affects the theoretical calculation of the
luminosity-specific density of IC PNe, which scales with t_PN. For t_PN=10,000
yr, our more conservative estimate, we obtain that the luminosity-specific
density of PNe is in fair agreement with the value obtained from Red Giants.
With our more realistic PN lifetime we infer a higher fraction (above 15%) of
IC starlight in the Virgo core than current estimates.Comment: Accepted for publication in the Astrophysical Journal 14 pages,
including 2 figure
Face recognition system using fringe projection and moiré: characterization with fractal parameters
We show a new method for face recognition which combines the projection of structures with different characteristics (fringes, bars or grids, dots or speckle) over the face. These projections will then allow the creation of a computer-generated moiré pattern over which different kinds of fractal and complex geometry parameters are then measured. Such parameters will then be used as inputs for a neuro-symbolic hybrid system. Here, we analyze the incidence of some parameters on the efficience for the face recognition method
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