scholarly journals Initial Radio Observations of SN1987a in the Large Magellanic Cloud

1988 ◽  
Vol 129 ◽  
pp. 189-189
Author(s):  
A. J. Turtle ◽  
D. Campbell-Wilson ◽  
J. D. Bunton ◽  
D. L. Jauncey ◽  
M. J. Kesteven ◽  
...  
Keyword(s):  
Flux Density ◽  
Southern Hemisphere ◽  
Radio Burst ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Observations ◽  
Radio Monitoring ◽  
Supernova 1987A ◽  
Peak Flux ◽  
Radio Outburst

A prompt radio burst has been observed from the supernova 1987a in the Large Magellanic Cloud. Observations were made at 0.843, 1.415, 2.29, and 8.41 GHz. At frequencies around 1 GHz, the peak flux density reached about 150 mJy and occurred within four days of the supernova. This event may be a weak precursor to a major radio outburst of the type previously observed in other extragalactic supernovae. Radio monitoring of the supernova is continuing at each of the above frequencies, and coordination is underway of a southern hemisphere VLBI array to map the radio outburst region as it expands. Differential astrometry carried out on prime-focus plates taken with the Anglo-Australian telescope indicates that the component, star 1, of Sanduleak's star SK-69202 is within 0.05 ± 0.13 arcsec of the supernova.

A prompt radio burst from supernova 1987A in the Large Magellanic Cloud

Nature ◽  
1987 ◽  
Vol 327 (6117) ◽  
pp. 38-40 ◽  
Author(s):  
A. J. Turtle ◽  
D. Campbell-Wilson ◽  
J. D. Bunton ◽  
D. L. Jauncey ◽  
M. J. Kesteven ◽  
...  
Keyword(s):  
Radio Burst ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Supernova 1987A

The interstellar spectrum towards the supernova 1987A in the Large Magellanic Cloud

Nature ◽  
1987 ◽  
Vol 326 (6115) ◽  
pp. 770-772 ◽  
Author(s):  
Paola Andreani ◽  
Roger Ferlet ◽  
Alfred Vidal-Madjar
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Supernova 1987A

Initial Radio Observations of SN1987a in the Large Magellanic Cloud

1988 ◽  
pp. 189-189
Author(s):  
A. J. Turtle ◽  
D. Campbell-Wilson ◽  
J. D. Bunton ◽  
D. L. Jauncey ◽  
M. J. Kesteven ◽  
...  
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Observations

scholarly journals Multifrequency radio observations of a SNR in the LMC: The case of SNR J0527-6549 (DEM l204)

2010 ◽  
pp. 43-49 ◽  
Author(s):  
L.M. Bozzetto ◽  
M.D. Filipovic ◽  
E.J. Crawford ◽  
I.S. Bojicic ◽  
J.L. Payne ◽  
...  
Keyword(s):  
Spectral Index ◽  
Supernova Remnant ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
High Order ◽  
Older Age ◽  
Radio Observations ◽  
Large Size ◽  
Peak Value ◽  
Compact Array

We present a detailed study and results of new Australia Telescope Compact Array (ATCA) observations of supernova remnant SNR J0527-6549. This Large Magellanic Cloud (LMC) object follows a typical supernova remnant (SNR) horseshoe morphology with a diameter of D=(66?58)?1 pc which is among the largest SNRs in the LMC. Its relatively large size indicates older age while a steeper than expected radio spectral index of ?=-0.92?0.11 is more typical of younger and energetic SNRs. Also, we report detections of regions with a high order of polarization at a peak value of ~54%?17% at 6 cm.

CONSTRAINT ON THE MASS AND LIFETIME OF HEAVY NEUTRINOS FROM THE SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD

1987 ◽  
Vol 02 (05) ◽  
pp. 293-298 ◽  
Author(s):  
MARIKO TAKAHARA ◽  
KATSUHIKO SATO
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Tau Neutrinos ◽  
Supernova 1987A ◽  
Stringent Constraint ◽  
Γ Ray

If heavy neutrinos were emitted from the supernova 1987A in the Large Magellanic Cloud (LMC) and decayed outside the star, a γ-ray burst would have been observed after the ν-burst. If this γ-ray burst was not observed, it would impose a constraint on the mass, mv, and lifetime, τν, of heavy neutrinos. We investigate this constraint on the assumption that the γ-ray burst was not observed and obtain a more stringent constraint than that imposed by cosmology. We find that the range of mass and lifetime of tau neutrinos (mv~50 MeV , τν~103 sec ), which is allowed by previous constraints from experiments and cosmology, is completely prohibited by the present constraint provided that the radius of the progenitor of this supernova is less than 1013 cm .

scholarly journals Recombination Lines near 6 cm Wavelength in the Large Magellanic Cloud

1974 ◽  
Vol 27 (5) ◽  
pp. 729 ◽  
Author(s):  
RX McGee ◽  
Lynette M Newton ◽  
JW Brooks
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Observations ◽  
Large Area ◽  
Line Temperature

Recombination lines H 10901: have been detected in eight sources in the Large Cloud of Magellan. Low ratios of line temperature to continuum temperature, TL/Tc, were found in most of the sources and are attributed to the difficulty of obtaining a true continuum value when such a large area is encompassed by the telescope beam. In the 30Doradus nebula the ratio N(He+)/N(H+) was found to be no greater than O' 08, or less than half that previously recorded by radio observations.

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