28,044 research outputs found
Using Lyman-alpha to detect galaxies that leak Lyman continuum
We propose to infer ionising continuum leaking properties of galaxies by
looking at their Lyman-alpha line profiles. We carry out Lyman-alpha radiation
transfer calculations in two models of HII regions which are porous to ionising
continuum escape: 1) the so-called "density bounded" media, in which massive
stars produce enough ionising photons to keep the surrounding interstellar
medium transparent to the ionising continuum, i.e almost totally ionised, and
2) "riddled ionisation-bounded" media, surrounded by neutral interstellar
medium, but with holes, i.e. with a covering factor lower than unity. The
Lyman-alpha spectra emergent from these configurations have distinctive
features: 1) a "classical" asymmetric redshifted profile in the first case, but
with a small shift of the maximum of the profile compare to the systemic
redshift (Vpeak < 150 km/s); 2) a main peak at the systemic redshift in the
second case (Vpeak = 0 km/s), with, as a consequence, a non-zero Lyman-alpha
flux bluewards the systemic redshift. Assuming that in a galaxy leaking
ionising photons, the Lyman-alpha component emerging from the leaking star
cluster(s) dominates the total Lyman-alpha spectrum, the Lyman-alpha shape may
be used as a pre-selection tool to detect Lyman continuum (LyC) leaking
galaxies, in objects with well determined systemic redshift, and high spectral
resolution Lyman-alpha spectra (R >= 4000). The examination of a sample of 10
local starbursts with high resolution HST-COS Lyman-alpha spectra and known in
the literature as LyC leakers or leaking candidates, corroborates our
predictions. Observations of Lyman-alpha profiles at high resolution should
show definite signatures revealing the escape of Lyman continuum photons from
star-forming galaxies.Comment: A&A in pres
Evaluating the Rationale for Folding Wing Tips Comparing the Exergy and Breguet Approaches
The design and development processes for future aircraft aims to address the environmental and efficiency challenges needed to facilitate the engineering of concepts that are far more integrated and require a multidisciplinary approach. This study investigates the benefit of incorporating span extension wing tips onto future aircraft configurations as a method of providing improved aerodynamic efficiency, whilst allowing the extension to fold on the ground to meet airport gate size constraints. Although the actuated wing tips are not studied in detail, the focus of this study is to compare two different methods of analysis that can be used to identify the benefit and limitations of adding such devices. The two methods considered are a quasi-steady implicit energy analysis based on the Breguet Range Equation and an explicit energy analysis based on the first and second laws of thermodynamics known as Exergy Analysis. It has been found that both methods provide agreeable results and have individual merits. The Breguet Range Equation can provide quick results in early design, whilst the Exergy Analysis has been found to be far more extensive and allows the complete dynamic behaviour of the aircraft to be assessed through a single metric. Hence, allowing comparison of losses from multiple subsystems
Acoustic spectral analysis and testing techniques
Subjects covered in four reports are described including: (1) mathematical techniques for combining decibel levels of octaves or constant bandwidth: (2) techniques for determining equation for power spectral density function; (3) computer program to analyze acoustical test data; and (4) computer simulation of horn responses utilizing hyperbolic horn theory
Gypsy moths and American dog ticks: Space partners
An experiment intended for the space shuttle and designed to investigate the effects of weightlessness and total darkness on gypsy moth eggs and engorged American dog ticks is described. The objectives are: (1) to reevaluate the effects of zero gravity on the termination of diapause/hibernation of embryonated gypsy moth eggs, (2) to determine the effect of zero gravity on the ovipositions and subsequent hatch from engorged female American dog ticks that have been induced to diapause in the laboratory, and (3) to determine whether morphological or biochemical changes occur in the insects under examination. Results will be compared with those from a similar experiment conducted on Skylab 4
A heralded quantum gate between remote quantum memories
We demonstrate a probabilistic entangling quantum gate between two distant
trapped ytterbium ions. The gate is implemented between the hyperfine "clock"
state atomic qubits and mediated by the interference of two emitted photons
carrying frequency encoded qubits. Heralded by the coincidence detection of
these two photons, the gate has an average fidelity of 90+-2%. This entangling
gate together with single qubit operations is sufficient to generate large
entangled cluster states for scalable quantum computing
Dynamic Models of the Interaction between Migration and the Differential Growth of Cities
The general area of interest of this paper is the dynamic relationship between regional imbalances, migration, and the differential growth of cities. In particular, the paper considers the feasibility of building dynamic models of the economic and demographic interactions between a set of linked cities, which could be used to explore the effects and repercussions of national settlement policies addressed at the alleviation of imbalances.
Inter-regional economic growth models are well known, and, recently several papers have focused on inter-regional demographic models. There has been less research on the dynamics of the interdependent interaction between economic and demographic growth. This paper focuses on this economic-demographic adjustment for a system of linked city regions and considers research results which point to several difficulties in building theoretically well structured dynamic models of differential city growth.
Part of the paper considers the inadequacies of current theories of inter-regional population migration and a new approach based on job-search theory is outlined
Completeness and Incompleteness of Synchronous Kleene Algebra
Synchronous Kleene algebra (SKA), an extension of Kleene algebra (KA), was
proposed by Prisacariu as a tool for reasoning about programs that may execute
synchronously, i.e., in lock-step. We provide a countermodel witnessing that
the axioms of SKA are incomplete w.r.t. its language semantics, by exploiting a
lack of interaction between the synchronous product operator and the Kleene
star. We then propose an alternative set of axioms for SKA, based on Salomaa's
axiomatisation of regular languages, and show that these provide a sound and
complete characterisation w.r.t. the original language semantics.Comment: Accepted at MPC 201
Nonelastic nuclear reactions and accompanying gamma radiation
Several aspects of nonelastic nuclear reactions which proceed through the formation of a compound nucleus are dealt with. The full statistical model and the partial statistical model are described and computer programs based on these models are presented along with operating instructions and input and output for sample problems. A theoretical development of the expression for the reaction cross section for the hybrid case which involves a combination of the continuum aspects of the full statistical model with the discrete level aspects of the partial statistical model is presented. Cross sections for level excitation and gamma production by neutron inelastic scattering from the nuclei Al-27, Fe-56, Si-28, and Pb-208 are calculated and compared with avaliable experimental data
Multiwavelength analysis of the Lyman alpha emitting galaxy Haro 2: relation between the diffuse Lyman alpha and soft X-ray emissions
In order to use Lyman alpha (Lya) emission as star formation tracer in
cosmological studies, we must understand how the resonant scattering affects
the escape fraction of the Lya photons. Thus, high spatial resolution
multiwavelength studies of nearby Lya emitters, like Haro 2, are highly needed.
For that purpose, we have used Chandra X-ray and HST (UV, optical and NIR)
images of Haro 2, and STIS and ground-based spectral images along its major and
minor axes, to characterize the Lya emission and the properties of the stellar
population. The UV, Ha (Halpha) and FIR luminosities of the Haro 2 nuclear
starburst are reproduced using evolutionary synthesis models assuming a young
stellar population with ages ~3.5-5.0 Myr, affected by differential
interstellar extinctions. The observed X-ray emission is attributed to gas
heated by the mechanical energy released by the starburst (soft component) and
a Ultra-Luminous X-ray source candidate (hard). Both compact and diffuse Lya
components are observed. Whereas Lya is spatially decoupled from Balmer lines
emission, Balmer decrement and UV continuum, the diffuse Lya component is
spatially correlated with the diffuse soft X-ray emission. Moreover, unlike the
compact one, diffuse Lya shows luminosities larger than predicted from Ha,
assuming case B recombination and dust extinction as derived from Ha/Hbeta. We
propose that, whereas the compact Lya emission is associated to the massive
stellar clusters and is affected by outflows and dust extinction, the diffuse
Lya originates in gas ionized by the hot plasma responsible for the soft X-ray
radiation, as suggested by their spatial correlation and by the measured
L(Ha)/LsoftX ratios. Calibration of Lya as star formation rate tracer should
therefore include both effects (destruction vs. enhancement) to avoid biases in
the study of galaxies at cosmological distances.Comment: Accepted for publication in A&A, 18 pages, 8 figures, 9 tables. If
problems with quality of images, see
http://www.cab.inta-csic.es/users/otih/haro2-v63.clean.pd
- …