scholarly journals A Comparison of X-Ray and Radio Emission from the Supernova Remnant Cassiopeia A

1996 ◽  
Vol 466 ◽  
pp. 309 ◽  
Author(s):  
Jonathan W. Keohane ◽  
Lawrence Rudnick ◽  
Martha C. Anderson
Keyword(s):  
Radio Emission ◽  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A

scholarly journals A Galactic dust devil: far-infrared observations of the Tornado supernova remnant candidate

2020 ◽  
Vol 499 (4) ◽  
pp. 5665-5678
Author(s):  
H Chawner ◽  
A D P Howard ◽  
H L Gomez ◽  
M Matsuura ◽  
F Priestley ◽  
...  
Keyword(s):  
Radio Emission ◽  
Supernova Remnant ◽  
Far Infrared ◽  
Large Mass ◽  
Dust Devils ◽  
Infrared Observations ◽  
X Ray ◽  
Ss 433 ◽  
Multiple Regions ◽  
Tail Structure

ABSTRACT We present complicated dust structures within multiple regions of the candidate supernova remnant (SNR) the ‘Tornado’ (G357.7–0.1) using observations with Spitzer and Herschel. We use point process mapping, ppmap, to investigate the distribution of dust in the Tornado at a resolution of 8 arcsec, compared to the native telescope beams of 5–36 arcsec. We find complex dust structures at multiple temperatures within both the head and the tail of the Tornado, ranging from 15 to 60 K. Cool dust in the head forms a shell, with some overlap with the radio emission, which envelopes warm dust at the X-ray peak. Akin to the terrestrial sandy whirlwinds known as ‘dust devils’, we find a large mass of dust contained within the Tornado. We derive a total dust mass for the Tornado head of 16.7 $\rm M_{\odot }$, assuming a dust absorption coefficient of κ300 = 0.56 $\rm m^2\, kg^{-1}$, which can be explained by interstellar material swept up by a SNR expanding in a dense region. The X-ray, infrared, and radio emission from the Tornado head indicate that this is a SNR. The origin of the tail is more unclear, although we propose that there is an X-ray binary embedded in the SNR, the outflow from which drives into the SNR shell. This interaction forms the helical tail structure in a similar manner to that of the SNR W50 and microquasar SS 433.

scholarly journals Search for Nonthermal X-Rays from Supernova Remnant Shells

1998 ◽  
Vol 188 ◽  
pp. 117-120
Author(s):  
R. Petre ◽  
J. Keohane ◽  
U. Hwang ◽  
G. Allen ◽  
E. Gotthelf
Keyword(s):  
Radio Emission ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Cosmic Ray ◽  
High Energy ◽  
X Rays ◽  
X Ray ◽  
Nonthermal Radio ◽  
Cosmic Ray Acceleration ◽  
Nonthermal Radio Emission

The suggestion that the shocks of supernova remnants (SNR's) are cosmic ray acceleration sites dates back more than 40 years. While observations of nonthermal radio emission from SNR shells indicate the ubiquity of GeV cosmic ray production, there is still theoretical debate about whether SNR shocks accelerate particles up to the well-known “knee” in the primary cosmic ray spectrum at ~3,000 TeV. Recent X-ray observations of SN1006 and other SNR's may have provided the missing observational link between SNR shocks and high energy cosmic ray acceleration. We discuss these observations and their interpretation, and summarize our ongoing efforts to find evidence from X-ray observations of cosmic ray acceleration in the shells of other SNR's.

The Soft X-Ray Spectra of Cassiopeia a and Tycho's Supernova Remnant

1975 ◽  
Vol 200 ◽  
pp. 158 ◽  
Author(s):  
R. W. Hill ◽  
G. A. Burginyon ◽  
F. D. Seward
Keyword(s):  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A

The polarization and depolarization of radio emission from supernova remnant Cassiopeia A

1995 ◽  
Vol 441 ◽  
pp. 300 ◽  
Author(s):  
M. C. Anderson ◽  
J. W. Keohane ◽  
L. Rudnick
Keyword(s):  
Radio Emission ◽  
Supernova Remnant ◽  
Cassiopeia A

scholarly journals The X-ray structure and mass of the Cassiopeia A supernova remnant

1980 ◽  
Vol 193 (2) ◽  
pp. 175-188 ◽  
Author(s):  
A. C. Fabian ◽  
R. Willingale ◽  
J. P. Pye ◽  
S. S. Murray ◽  
G. Fabbiano
Keyword(s):  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A

scholarly journals The X-Ray Expansion of the Supernova Remnant Cassiopeia A

1998 ◽  
Vol 505 (1) ◽  
pp. L27-L30 ◽  
Author(s):  
Barron Koralesky ◽  
L. Rudnick ◽  
E. V Gotthelf ◽  
J. W. Keohane
Keyword(s):  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A

scholarly journals Multi-year X-Ray Variations of Iron-K and Continuum Emissions in the Young Supernova Remnant Cassiopeia A

2017 ◽  
Vol 836 (2) ◽  
pp. 225 ◽  
Author(s):  
Toshiki Sato ◽  
Yoshitomo Maeda ◽  
Aya Bamba ◽  
Satoru Katsuda ◽  
Yutaka Ohira ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A ◽  
Young Supernova Remnant

scholarly journals Locating the TeV γ-rays from the shell regions of Cassiopeia A

2013 ◽  
Vol 9 (S296) ◽  
pp. 380-381
Author(s):  
Lab Saha ◽  
Tulun Ergin ◽  
Pratik Majumdar ◽  
Mustafa Bozkurt
Keyword(s):  
Energy Range ◽  
Power Law ◽  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A ◽  
Young Supernova Remnant ◽  
Multi Wavelength ◽  
Flux Level ◽  
Γ Rays ◽  
Different Parts

AbstractWe have analyzed Chandra X-ray data from different parts of the shell of young supernova remnant (SNR) in the energy range of 0.7 - 8 keV. We observed that X-ray flux level varies over different shell regions of the source. Implications of X-ray observation will be discussed here. We also analyzed Fermi-LAT data in the energy range 0.5 - 50 GeV for the source. The differential spectrum obtained in this way fits with simple power-law. We also present here multi-wavelength modeling of the source considering archival radio and TeV data along with Chandra and Fermi-LAT data.

Studies of the X-ray emission from supernova remnants

1974 ◽  
Vol 340 (1623) ◽  
pp. 423-437
Keyword(s):  
Supernova Remnants ◽  
Column Density ◽  
Supernova Remnant ◽  
Crab Nebula ◽  
Lower Intensity ◽  
X Ray ◽  
Cassiopeia A ◽  
Cygnus Loop ◽  
A Value ◽  
The Crab Nebula

Supernova remnants are now recognized as a class of soft X-ray emitting-objects. The evolution of a remnant’s X-ray emission is discussed and a number of possible X-ray emission mechanisms are described. The spectrum of the Crab Nebula has been studied with Copernicus. The data have been used to derive a value of the gas column density of the interstellar medium. The X-ray structure and spectrum of the remnant Cassiopeia. A have been investigated and the results are presented. A high resolution X-ray map of the Puppis A supernova remnant has been obtained and the interpretation of the X-ray structure is discussed. X-ray emission has been detected from the pulsar PSR 08 33-45. This observation is compared with data obtained from the Uhuru satellite in order to derive the gas column density to the source. Weak soft X-ray emission has been detected from the Cygnus Loop in the regions expected but a t a lower intensity – a search for regions of higher intensity is continuing. A programme to identify known radio remnants as X-ray emitters is in progress and the results obtained so far are reported.

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