scholarly journals Balmer-Dominated Shocks: A Concise Review

2010 ◽  
Vol 27 (1) ◽  
pp. 23-44 ◽  
Author(s):  
Kevin Heng
Keyword(s):  
Cosmic Rays ◽  
Supernova Remnants ◽  
High Redshift ◽  
Ion Temperature ◽  
Pulsar Wind Nebulae ◽  
Collisionless Shocks ◽  
High Redshift Galaxies ◽  
Concise Review ◽  
Astrophysical Objects ◽  
Pulsar Wind

AbstractA concise and critical review of Balmer-dominated shocks (BDSs) is presented, summarizing the state of theory and observations, including models with/without shock precursors and their synergy with atomic physics. Observations of BDSs in supernova remnants are reviewed on an object-by-object basis. The relevance of BDSs towards understanding the acceleration of cosmic rays in shocks is emphasized. Probable and possible detections of BDSs in astrophysical objects other than supernova remnants, including pulsar wind nebulae and high-redshift galaxies, are described. The case for the continued future of studying BDSs in astrophysics is made, including their relevance towards understanding electron–ion temperature equilibration in collisionless shocks.

VERITAS OBSERVATIONS OF RELATIVISTIC JETS

2012 ◽  
Vol 08 ◽  
pp. 55-60
Author(s):  
RESHMI MUKHERJEE
Keyword(s):  
Black Holes ◽  
Supernova Remnants ◽  
Binary Systems ◽  
Active Galaxies ◽  
Relativistic Jets ◽  
Pulsar Wind Nebulae ◽  
Cherenkov Telescopes ◽  
Astrophysical Objects ◽  
Pulsar Wind ◽  
Galactic Sources

VERITAS is an array of four imaging atmospheric Cherenkov telescopes located in southern Arizona, and is now starting its fifth year of observations of the northern Sky at energies > 100 GeV. Observations of astrophysical objects in the TeV band are sensitive probes of highly energetic processes occurring in these sources. The majority of the active galaxies detected at TeV energies are blazars, sources where we view the jet nearly along its axis. TeV and multiwavelength observations of blazars help us to better understand the mechanisms of ultrarelativistic jet production by supermassive black holes, and constrain models of particle acceleration in blazar jets. Galactic sources at TeV energies include supernova remnants, pulsar wind nebulae, and binary systems, and TeV emission is a key diagnostic of highly energetic particles in these objects. This report presents recent results from VERITAS on Galactic and extragalactic sources.

scholarly journals The H.E.S.S. Galactic Plane Survey

2009 ◽  
Vol 5 (H15) ◽  
pp. 808-808
Author(s):  
Emma de Oña-Wilhelmi
Keyword(s):  
Supernova Remnants ◽  
Binary Systems ◽  
Galactic Plane ◽  
Giant Molecular Clouds ◽  
Pulsar Wind Nebulae ◽  
Compact Binary ◽  
Pulsar Wind ◽  
Star Formation Regions ◽  
Galactic Sources ◽  
Gps Observations

AbstractThe H.E.S.S. Galactic Plane Survey (GPS) has revealed a large number of Galactic Sources, including Pulsar Wind Nebulae (PWN), Supernova Remnants (SNRs), giant molecular clouds, star formation regions and compact binary systems, as well as a number of unidentified objects, or dark sources, for which no obvious counterparts at other wavelengths have yet been found. We will review the latest results from the GPS observations and discuss the most interesting cases.

scholarly journals Peculiar Differences in Radio and X-ray Synchrotron Radiation from Pulsar Wind Nebulae

2004 ◽  
Vol 218 ◽  
pp. 221-224
Author(s):  
John R. Dickel ◽  
Shiya Wang
Keyword(s):  
Synchrotron Radiation ◽  
Radio Emission ◽  
Supernova Remnants ◽  
Crab Nebula ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
Pulsar Wind ◽  
The Crab Nebula

Several Crab-type supernova remnants appear to have very bright non-thermal X-ray cores just around the pulsar or expected pulsar. This X-ray brightness is often not matched by a corresponding increase in radio emission. The best example of this phenomenon is in N157B in the LMC. G21.5−0.9 and possibly 3C 58 also show it while the Crab Nebula and 0540−69.3 do not. Some method to enhance the higher energy particles must be present in these objects.

The interaction of pulsar winds with old supernova remnants

2000 ◽  
Vol 177 ◽  
pp. 513-514
Author(s):  
Eric van der Swaluw ◽  
Abraham Achterberg ◽  
Yves A. Gallant
Keyword(s):  
Cosmic Rays ◽  
Shock Waves ◽  
Radio Emission ◽  
Supernova Remnants ◽  
Charged Particles ◽  
Simple Problem ◽  
Relativistic Electrons ◽  
First Case ◽  
Pulsar Wind ◽  
Pulsar Winds

Shock waves in young supernova remnants (SNR) are generally considered to be the places where production and acceleration of charged particles (relativistic electrons and cosmic rays) take place. Older remnants can be re-energised if an active pulsar catches up with the shell of the remnant (Shull, Fesen, & Saken 1989). In that case a pulsar-driven wind can inject energetic particles into the shell, resulting into a rejuvenation of the radio emission of the old remnant due to the presence of additional relativistic electrons.Radio observations of CTB80 (Angerhofer et al. 1981) and G5.4-1.2 (Frail & Kulkarni 1991) give evidence for the importance of the presence of an active pulsar close to the old shell of the remnants. In the first case the pulsar is believed to be inside the SNR. In the second case the pulsar is thought to have penetrated the shell of the SNR, and resides in the interstellar medium (ISM). We intend to investigate the physics which are connected with these kind of systems. One expects new effects resulting from the interaction of the three different shocks; the SNR shock, the bowshock bounding the pulsar wind nebula (PWN) and the (pulsar) wind termination shock. The dynamics of the system is described by a hydrodynamics code. We use the results from the hydrodynamics code to investigate the process of acceleration and transport of particles which are advected by the flow and diffuse with respect to the flow. We have applied the latter to a simple problem, the case of a spherically expanding SNR.

scholarly journals A catalogue of Galactic supernova remnants in the far-infrared: revealing ejecta dust in pulsar wind nebulae

2018 ◽  
Vol 483 (1) ◽  
pp. 70-118 ◽  
Author(s):  
H Chawner ◽  
K Marsh ◽  
M Matsuura ◽  
H L Gomez ◽  
P Cigan ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Far Infrared ◽  
Pulsar Wind Nebulae ◽  
Pulsar Wind

scholarly journals A LOFAR search for steep-spectrum pulsars in supernova remnants and pulsar wind nebulae

2019 ◽  
Vol 623 ◽  
pp. A90 ◽  
Author(s):  
S. M. Straal ◽  
J. van Leeuwen
Keyword(s):  
Black Hole ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Point Sources ◽  
Pulsar Wind Nebulae ◽  
Upper Limits ◽  
Formation History ◽  
Propagation Effects ◽  
Pulsar Wind ◽  
Rule Out

Pinpointing a pulsar in its parent supernova remnant (SNR) or resulting pulsar wind nebula (PWN) is key to understanding its formation history and the pulsar wind mechanism, yet only about half the SNRs and PWNe appear associated with a pulsar. Our aim was to find the pulsars in a sample of eight known and new SNRs and PWNe. Using the LOFAR radio telescope at 150 MHz, each source was observed for 3 h. We covered the entire remnants where needed, by employing many tied-array beams to tile out even the largest objects. For objects with a confirmed point source or PWN we constrained our search to those lines of sight. We identified a promising radio pulsar candidate towards PWN G141.2+5.0. The candidate, PSR J0337+61, has a period of 94 ms and a DM of 226 pc cm−3. We re-observed the source twice with increased sensitivities of 30% and 50%, but did not re-detect it. It thus remains unconfirmed. For our other sources we obtain very stringent upper limits of 0.8 − 3.1 mJy at 150 MHz. Generally, we can rule out that the pulsars travelled out of the remnant. From these strict limits we conclude our non-detections towards point sources and PWNe are the result of beaming and propagation effects. Some of the remaining SNRs should host a black hole rather than a neutron star.

scholarly journals Magnetic Rayleigh-Taylor instability for Pulsar Wind Nebulae in expanding Supernova Remnants

2004 ◽  
Vol 423 (1) ◽  
pp. 253-265 ◽  
Author(s):  
N. Bucciantini ◽  
E. Amato ◽  
R. Bandiera ◽  
J. M. Blondin ◽  
L. Del Zanna
Keyword(s):  
Supernova Remnants ◽  
Taylor Instability ◽  
Pulsar Wind Nebulae ◽  
Rayleigh Taylor Instability ◽  
Pulsar Wind

scholarly journals Pulsar Wind Nebulae inside Supernova Remnants as Cosmic-Ray PeVatrons

2018 ◽  
Vol 478 (1) ◽  
pp. 926-931 ◽  
Author(s):  
Yutaka Ohira ◽  
Shota Kisaka ◽  
Ryo Yamazaki
Keyword(s):  
Supernova Remnants ◽  
Cosmic Ray ◽  
Pulsar Wind Nebulae ◽  
Pulsar Wind
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