375 research outputs found
NGC 1300 Dynamics: III. Orbital analysis
We present the orbital analysis of four response models, that succeed in
reproducing morphological features of NGC 1300. Two of them assume a planar
(2D) geometry with =22 and 16 \ksk respectively. The two others
assume a cylindrical (thick) disc and rotate with the same pattern speeds as
the 2D models. These response models reproduce most successfully main
morphological features of NGC 1300 among a large number of models, as became
evident in a previous study. Our main result is the discovery of three new
dynamical mechanisms that can support structures in a barred-spiral grand
design system. These mechanisms are presented in characteristic cases, where
these dynamical phenomena take place. They refer firstly to the support of a
strong bar, of ansae type, almost solely by chaotic orbits, then to the support
of spirals by chaotic orbits that for a certain number of pat tern revolutions
follow an n:1 (n=7,8) morphology, and finally to the support of spiral arms by
a combination of orbits trapped around L and sticky chaotic orbits with
the same Jacobi constant. We have encountered these dynamical phenomena in a
large fraction of the cases we studied as we varied the parameters of our
general models, without forcing in some way their appearance. This suggests
that they could be responsible for the observed morphologies of many
barred-spiral galaxies. Comparing our response models among themselves we find
that the NGC 130 0 morphology is best described by a thick disc model for the
bar region and a 2D disc model for the spirals, with both components rotating
with the same pattern speed =16 \ksk !. In such a case, the whole
structure is included inside the corotation of the system. The bar is supported
mainly by regular orbits, while the spirals are supported by chaotic orbits.Comment: 18 pages, 32 figures, accepted for publication in MNRA
Pitch Angle Restrictions in Late Type Spiral Galaxies Based on Chaotic and Ordered Orbital Behavior
We built models for low bulge mass spiral galaxies (late type as defined by
the Hubble classification) using a 3-D self-gravitating model for spiral arms,
and analyzed the orbital dynamics as a function of pitch angle, going from
10 to 60. Testing undirectly orbital self-consistency, we search
for the main periodic orbits and studied the density response. For pitch angles
up to approximately , the response supports closely the potential
permitting readily the presence of long lasting spiral structures. The density
response tends to "avoid" larger pitch angles in the potential, by keeping
smaller pitch angles in the corresponding response. Spiral arms with pitch
angles larger than , would not be long-lasting structures but
rather transient. On the other hand, from an extensive orbital study in phase
space, we also find that for late type galaxies with pitch angles larger than
, chaos becomes pervasive destroying the ordered phase space
surrounding the main stable periodic and quasi-periodic orbits and even
destroying them. This result is in good agreement with observations of late
type galaxies, where the maximum observed pitch angle is .Comment: ApJL accepted (12 pages, 3 figures
NGC 1300 Dynamics: II. The response models
We study the stellar response in a spectrum of potentials describing the
barred spiral galaxy NGC 1300. These potentials have been presented in a
previous paper and correspond to three different assumptions as regards the
geometry of the galaxy. For each potential we consider a wide range of
pattern speed values. Our goal is to discover the geometries and the
supporting specific morphological features of NGC 1300. For this
purpose we use the method of response models. In order to compare the images of
NGC 1300 with the density maps of our models, we define a new index which is a
generalization of the Hausdorff distance. This index helps us to find out
quantitatively which cases reproduce specific features of NGC 1300 in an
objective way. Furthermore, we construct alternative models following a
Schwarzschild type technique. By this method we vary the weights of the various
energy levels, and thus the orbital contribution of each energy, in order to
minimize the differences between the response density and that deduced from the
surface density of the galaxy, under certain assumptions. We find that the
models corresponding to \ksk and \ksk are
able to reproduce efficiently certain morphological features of NGC 1300, with
each one having its advantages and drawbacks.Comment: 13 pages, 10 figures, accepted for publication in MNRA
Central mass accumulation in nuclear spirals
In central regions of non-axisymmetric galaxies high-resolution
hydrodynamical simulations indicate spiral shocks, which are capable of
transporting gas inwards. The efficiency of transport is lower at smaller
radii, therefore instead of all gas dropping onto the galactic centre, a
roughly uniform distribution of high-density gas develops in the gaseous
nuclear spiral downstream from the shock, and the shear in gas is very low
there. These are excellent conditions for star formation. This mechanism is
likely to contribute to the process of (pseudo-) bulge formation.Comment: 4 pages, 2 figures, to appear in the proceedings of the IAU Symposium
245, "Formation and Evolution of Galaxy Bulges
Instabilities and stickiness in a 3D rotating galactic potential
We study the dynamics in the neighborhood of simple and double unstable
periodic orbits in a rotating 3D autonomous Hamiltonian system of galactic
type. In order to visualize the four dimensional spaces of section we use the
method of color and rotation. We investigate the structure of the invariant
manifolds that we found in the neighborhood of simple and double unstable
periodic orbits in the 4D spaces of section. We consider orbits in the
neighborhood of the families x1v2, belonging to the x1 tree, and the z-axis
(the rotational axis of our system). Close to the transition points from
stability to simple instability, in the neighborhood of the bifurcated simple
unstable x1v2 periodic orbits we encounter the phenomenon of stickiness as the
asymptotic curves of the unstable manifold surround regions of the phase space
occupied by rotational tori existing in the region. For larger energies, away
from the bifurcating point, the consequents of the chaotic orbits form clouds
of points with mixing of color in their 4D representations. In the case of
double instability, close to x1v2 orbits, we find clouds of points in the four
dimensional spaces of section. However, in some cases of double unstable
periodic orbits belonging to the z-axis family we can visualize the associated
unstable eigensurface. Chaotic orbits close to the periodic orbit remain sticky
to this surface for long times (of the order of a Hubble time or more). Among
the orbits we studied we found those close to the double unstable orbits of the
x1v2 family having the largest diffusion speed.Comment: 29pages, 25 figures, accepted for publication in the International
Journal of Bifurcation and Chao
Toward a Discourse Community for Telemedicine: A Domain Analytic View of Published Scholarship
In the past 20 years, the use of telemedicine has increased, with telemedicine programs increasingly being conducted through the Internet and ISDN technologies. The purpose of this dissertation is to examine the discourse community of telemedicine. This study examined the published literature on telemedicine as it pertains to quality of care, defined as correct diagnosis and treatment (Bynum and Irwin 2011). Content analysis and bibliometrics were conducted on the scholarly discourse, and the most prominent authors and journals were documented to paint and depict the epistemological map of the discourse community of telemedicine. A taxonomy based on grounded research of scholarly literature was developed and validated against other existing taxonomies. Telemedicine has been found to increase the quality and access of health care and decrease health care costs (Heinzelmann, Williams, Lugn and Kvedar 2005 and Wootton and Craig 1999). Patients in rural areas where there is no specialist or patients who find it difficult to get to a doctor’s office benefit from telemedicine. Little research thus far has examined scholarly journals in order to aggregate and analyze the prevalent issues in the discourse community of telemedicine. The purpose of this dissertation is to empiricallydocument the prominent topics and issues in telemedicine by examining the related published scholarly discourse of telemedicine during a snapshot in time. This study contributes to the field of telemedicine by offering a comprehensive taxonomy of the leading authors and journals in telemedicine, and informs clinicians, librarians and other stakeholders, including those who may want to implement telemedicine in their institution, about issues telemedicine
The Legacy of African Veterans of World War II and Their Role in the Independence Movements of the Mid–Century
Throughout the First and Second World Wars, armies of African soldiers fought in defense of European interests, while being relegated to colonial status and making very little progress toward gaining independence of their own. The focus of this article is Léopold Senghor, the first president of independent Senegal, and the profound impact he had as a war veteran and member of the Tirailleurs Sénégalais (Senegalese Skirmishers) on independence movements in French West Africa. This essay will then examine the origins of post–war independence movements, the role that veterans like Senghor played in these movements, and the means by which they broke free from France. This essay builds on the work of historians Frederick Cooper, Myron Echenberg, Gregory Mann, Nancy Lawler, and others to paint a more comprehensive picture of veteran participation in independence, while using Léopold Senghor as a constant thread to help explain why veterans who had reason to remain loyal to the French colonial empire decided to break free from it
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