51,898 research outputs found
Understanding the radio emission geometry of PSR B0329+54
We have analyzed high-quality single pulse data of PSR B0329+54 at 325 MHz
and 606 MHz to study the structure of the emission beam. Using the
window-threshold technique, which is suitable for detecting weak emission
components, we have detected 4 additional emission components in the pulse
window. Three of these are new components and the fourth is a confirmation of a
recently proposed component. Hence PSR B0329+54 is now known to have 9 emission
components - the highest among all known pulsars. The distribution of the pulse
components around the central core component indicates that the emission beam
consists of four nested cones. The asymmetry in the location of the conal
components in the leading versus trailing parts of the profile is interpreted
as being due to aberration and retardation in the pulsar magnetosphere. These
measurements allow us to determine the precise location of the 4 conal rings of
emission. We find that the successive outer cones are emitted at higher
altitudes in the magnetosphere. Further, for any given cone, the emission
height at the lower frequency is found to be more than that at the higher
frequency. The inferred heights range from ~160 km to ~1150 km. The set of
``active'' field lines, from which most of the conal radiation appears to
originate, are found to be confined to a region located within ~0.5 to ~0.6 of
the polar cap radius. We discuss the implications of our new findings on our
understanding of the pulsar emission geometry and its impact on the emission
mechanisms.Comment: 20 pages, 5 figures. Accepted for Astrophysical Journa
Understanding the effects of geometry and rotation on pulsar intensity profiles
We have developed a method to compute the possible distribution of radio
emission regions in a typical pulsar magnetosphere, taking into account the
viewing geometry and rotational effects of the neutron star. Our method can
estimate the emission altitude and the radius of curvature of particle
trajectory as a function of rotation phase for a given inclination angle,
impact angle, spin-period, Lorentz factor, field line constant and the
observation frequency. Further, using curvature radiation as the basic emission
mechanism, we simulate the radio intensity profiles that would be observed from
a given distribution of emission regions, for different values of radio
frequency and Lorentz factor. We show clearly that rotation effects can
introduce significant asymmetries into the observed radio profiles. We
investigate the dependency of profile features on various pulsar parameters. We
find that the radiation from a given ring of field lines can be seen over a
large range of pulse longitudes, originating at different altitudes, with
varying spectral intensity. Preferred heights of emission along discrete sets
of field lines are required to reproduce realistic pulsar profiles, and we
illustrate this for a known pulsar. Finally, we show how our model provides
feasible explanations for the origin of core emission, and also for one-sided
cones which have been observed in some pulsars.Comment: 21 pages, 11 figures, accepted for publication in MNRA
Theoretical study of reactive and nonreactive turbulent coaxial jets
The hydrodynamic properties and the reaction kinetics of axisymmetric coaxial turbulent jets having steady mean quantities are investigated. From the analysis, limited to free turbulent boundary layer mixing of such jets, it is found that the two-equation model of turbulence is adequate for most nonreactive flows. For the reactive flows, where an allowance must be made for second order correlations of concentration fluctuations in the finite rate chemistry for initially inhomogeneous mixture, an equation similar to the concentration fluctuation equation of a related model is suggested. For diffusion limited reactions, the eddy breakup model based on concentration fluctuations is found satisfactory and simple to use. The theoretical results obtained from these various models are compared with some of the available experimental data
Non-perturbative improvement of bilinears in unquenched QCD
We describe how the improvement of quark bilinears generalizes from quenched
to unquenched QCD, and discuss which of the additional improvement constants
can be determined using Ward Identities.Comment: LATTICE99 (Improvement and Renormalization). 3 pages, no figures.
Corrected error (improvement coefficient is not needed
Moessbauer studies in zinc-manganese ferrites for use in measuring small velocities and accelerations with great precision
Mossbauer spectroscopy was used for a systematic study of the magnetic behavior of manganese and zinc in mixed ferrites. It was observed that Zn2+ has preference to substitute Mn2+ at interstitial sites where the metal ions are tetrahedrally coordinated with four oxygen neighbors. The internal magnetic hyperfine field at the tetrahedral iron site is larger than that at the octahedral site. The relaxation effects were observed to play an important role as the zinc contents were increased, while the spin-correlation time and the magnetic field were observed to decrease in strength. It is concluded that Mossbauer effect data on complex materials, when used in conjunction with other data, can provide useful insight into the origin of the microscopic properties of magnetic materials
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