scholarly journals Supernova Remnants in the UWISH2 and UWIFE Surveys

2013 ◽  
Vol 9 (S296) ◽  
pp. 370-371
Author(s):  
Yong-Hyun Lee ◽  
Bon-Chul Koo ◽  
Jae-Joon Lee
Keyword(s):  
Supernova Remnants ◽  
Preliminary Results ◽  
Phase Medium ◽  
Line Features ◽  
Multi Phase ◽  
Identification Strategy

AbstractWe report the preliminary results for the detection of H2 and [Fe II] line features around the Galactic supernova remnants (SNRs) from the UWISH2 and UWIFE surveys that cover the first galactic quadrant of 7°<l<65° and |b|<1.3°. By this time, we have found a total of 17 H2-emitting and 14 [Fe II]-emitting SNRs in the coverage, and more than a half of them are detected in both H2 and [Fe II] emissions, which implies that the environment of these SNRs might be complex and composed of multi-phase medium. In this paper, we present our identification strategy and some preliminary results including H2 and [Fe II] luminosity distributions.

Application of Low-Frequency Energy Increment Technology in Hydrocarbon Prediction

2012 ◽  
Vol 472-475 ◽  
pp. 178-182
Author(s):  
Zhi Ming Li ◽  
Xue Yan Hu ◽  
Ling Xia Zhen
Keyword(s):  
Laboratory Data ◽  
Low Frequency ◽  
Biot Theory ◽  
Hydrocarbon Detection ◽  
Hydrocarbon Prediction ◽  
Phase Medium ◽  
Multi Phase ◽  
Cave Detection ◽  
Fluid Detection ◽  
Energy Increment

Based on the Biot theory and laboratory data, engineers of LandOcean recently develop a certain technology for hydrocarbon detection in multi-phase medium in order to reduce ambiguity and uncertainty. The sensitivity of the technology is superior to others especially in carbonate pores and cave detection, igneous hydrocarbon prediction and fluid detection of non-well areas. A number of projects and wells drilling proved that this technology is effective and reliable.

scholarly journals Mathematical Simulation of the Behavior of a Cumulative Jet with Inert and Reactive Components

2019 ◽  
pp. 19-34
Author(s):  
A.V. Babkin ◽  
A.A. Medeltsev ◽  
F.S. Zagryadskiy ◽  
M.A. Krutskevich
Keyword(s):  
Extension Problem ◽  
Composite Liner ◽  
Three Phase ◽  
Phase Medium ◽  
Chemically Reacting Systems ◽  
Reactive Additives ◽  
Chemically Reacting ◽  
Characteristic Features ◽  
Reacting Systems ◽  
Multi Phase

The purpose of the research was to investigate the processes associated with the free flight of a cumulative jet formed from a composite liner of a cumulative charge. We mathematically simulated the process from the perspective of continuum mechanics using numerical methods for solving the corresponding equations. The cumulative jet was simulated in the quasi-two-dimensional nonstationary approximation as a high-gradient cylindrical compressible elastoplastic or liquid rod. The material of the jet was considered as a one-speed three-phase medium. The compressibility of each phase was described by its inherent barotropic dependence of pressure on density. The resulting pressure in a multiphase mixture of particles of the cumulative jet, considered as a composite material, was determined on the basis of the additivity condition of the volumes. When assessing the composition of the jet, we determined the initial concentrations of the components using a software package for thermo-dynamic simulation of chemically reacting systems. To find the numerical solution of the multi-phase, i.e., composite, jet extension problem, we used a finite-difference method based on Neumann --- Richtmyer scheme. The numerical analysis of the process under study was carried out on the example of a laboratory cumulative charge. Within the research, we found the characteristic features and possible variations in the behavior of the jet depending on the presence of the components of the composite liner, i.e., matrix, inert and reactive additives, and their properties. Finally, we estimated the change in the penetrating power of the jet compared to the reference variant of the cumulative liner of a homogeneous single-phase monolithic material.

scholarly journals Nonlinear diffusion of cosmic rays escaping from supernova remnants: Cold partially neutral atomic and molecular phases

2020 ◽  
Vol 633 ◽  
pp. A72 ◽  
Author(s):  
L. Brahimi ◽  
A. Marcowith ◽  
V. S. Ptuskin
Keyword(s):  
Cosmic Rays ◽  
Supernova Remnants ◽  
Cosmic Ray ◽  
Alfven Wave ◽  
Nonlinear Propagation ◽  
Neutral Medium ◽  
Streaming Instability ◽  
Weakly Ionized ◽  
Two Phases ◽  
Multi Phase

Aims. We aim to elucidate cosmic ray (CR) propagation in the weakly ionized environments of supernova remnants (SNRs) basing our analysis on the cosmic ray cloud (CRC) model. Methods. We solved two transport equations simultaneously: one for the CR pressure and one for the Alfvén wave energy density where CRs are initially confined in the SNR shock. Cosmic rays trigger a streaming instability and produce slab-type resonant Alfvén modes. The self-generated turbulence is damped by ion-neutral collisions and by noncorrelated interaction with Alfvén modes generated at large scales. Results. We show that CRs leaking in cold dense phases such as those found in cold neutral medium (CNM) and diffuse molecular medium (DiM) can still be confined over distances of a few tens of parsecs from the CRC center for a few thousand years. At 10 TeV, CR diffusion can be suppressed by two or three orders of magnitude. This effect results from a reduced ion-neutral collision damping in the decoupled regime. We calculate the grammage of CRs in these environments. We find that in both single and multi-phase setups at 10 GeV, CNM and DiM media can produce grammage in the range 10–20 g cm−2 in the CNM and DiM phases. At 10 TeV, because of nonlinear propagation the grammage increases to values in the range 0.5–20 g cm−2 in these two phases. We also present preliminary calculations in inhomogeneous interstellar medium combining two or three different phases where we obtain the same trends.

scholarly journals The Morphology of Sérsic-Pastoriza Galaxies

1990 ◽  
Vol 124 ◽  
pp. 245-249
Author(s):  
G.J. Yates ◽  
A. Pedlar ◽  
D.J. Saikia ◽  
S.W. Unger ◽  
D.J. Axon
Keyword(s):  
Supernova Remnants ◽  
Neutral Hydrogen ◽  
Radio Continuum ◽  
Preliminary Results ◽  
Central Regions

AbstractIn this paper we present the preliminary results of our radio-continuum and neutral hydrogen observations of Sérsic-Pastoriza (S-P) galaxies. We show that the central regions contain a population of compact features thought to be young supernova remnants (SNRs) and discuss the overall morphology of the nuclei.

scholarly journals An Infrared Survey of Galactic Supernova Remnants

1988 ◽  
Vol 101 ◽  
pp. 379-382
Author(s):  
Richard G. Arendt
Keyword(s):  
Data Base ◽  
Supernova Remnants ◽  
Galactic Plane ◽  
Spectral Characteristics ◽  
Cassiopeia A ◽  
Preliminary Results ◽  
Infrared Astronomical Satellite ◽  
Astronomical Satellite ◽  
Infrared Survey

AbstractPresented here are preliminary results from a survey of supernova remnants (SNRs) in the data base collected by the Infrared Astronomical Satellite (IRAS). About one-third of the known galactic SNRs are visible in the IRAS data. Confusion with other sources in the galactic plane prohibits the detection of many remnants. The objects that are detected have similar spectral characteristics and temperatures, except that the three youngest remnants known, Tycho, Kepler, and Cassiopeia A, are distinctly warmer.

scholarly journals Multi-Phase Dynamics of Magnetized Interstellar Medium

2009 ◽  
Vol 5 (H15) ◽  
pp. 444-445
Author(s):  
Shu-ichiro Inutsuka
Keyword(s):  
Interstellar Medium ◽  
Thermal Instability ◽  
Transition Dynamics ◽  
Phase Dynamics ◽  
Field Amplification ◽  
Linear Perturbations ◽  
Phase Medium ◽  
Strong Motivation ◽  
Multi Phase ◽  
The Magnetic Field

AbstractThe recent progress in our understanding of the dynamics of muliti-phase interstellar medium (ISM) is reviewed. Non-linear perturbations (e.g., shock waves or time-dependent radiation field) lead to the interchange between warm phase and cold phase via thermal instability. Dynamical modelling of this phase transition dynamics is essential in describing ubiquitous turbulence in ISM and the formation of molecular clouds. A concept of magnetically multi-phase medium is introduced. Recent finding of the magnetic field amplification in the blast wave propagating in magnetized multi-phase ISM is providing a strong motivation for rapid acceleration of cosmic rays.

scholarly journals VLA Observations of Far-IR Sources Toward the Galactic Center

1989 ◽  
Vol 136 ◽  
pp. 205-211 ◽  
Author(s):  
Sten F. Odenwald
Keyword(s):  
Supernova Remnants ◽  
Galactic Center ◽  
Hii Regions ◽  
Radio Sources ◽  
Filamentary Structure ◽  
Preliminary Results ◽  
Ir Sources

Preliminary results are presented from a 4.8-GHz VLA study of 5 far-IR sources within 1° of the Galactic center. Sgr-D and FIR-27 appear to be nearly featureless radio sources similar to young blister type HII regions, and FIR-21 has a filamentary structure similar to bright rimmed HII regions or Crab-like supernova remnants. Also presented are additional observations of Sgr-C.

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