scholarly journals The Radio Continuum of the Large Magellanic Cloud. IV. Spectra of Sources

1972 ◽  
Vol 25 (5) ◽  
pp. 619 ◽  
Author(s):  
RX McGee ◽  
Lynette M Newton
Keyword(s):  
Supernova Remnants ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Radio Sources ◽  
Spectral Indices ◽  
Class 1 ◽  
Background Continuum ◽  
Continuum Radio ◽  
The Continuum

The continuum radio sources in the direction of the Large Magellanic Cloud are classified in terms of their spectral indices. Of 52 sources for which spectral data were available three distinct classes exist: (1) sources with spectral indices = ?0�20, of which 21 out of 23 have been identified with HII regions in the Henize catalogue; (2) sources with spectral indices < ?0�20 that have been identified with Henize objects, of which it is possible that many are supernova remnants; and (3) sources with spectral indices < ?0�20 that have not been identified with optical objects and are considered to be outside the LMC. Six "double sources" with one member belonging to class (1) and the other to class (2) were found. The background continuum radiation is also discussed.

scholarly journals A Radio Continuum Survey of the Magellanic Clouds

1984 ◽  
Vol 108 ◽  
pp. 283-291 ◽  
Author(s):  
B. Y. Mills ◽  
A. J. Turtle
Keyword(s):  
Supernova Remnants ◽  
Large Magellanic Cloud ◽  
Magellanic Clouds ◽  
Radio Continuum ◽  
Radio Sources ◽  
Synchrotron Emission ◽  
Low Frequencies ◽  
External Galaxies ◽  
Continuum Radio ◽  
The Individual

Continuum radio emission from the Large Magellanic Cloud was first detected just 30 years ago (Mills & Little, 1953). Subsequently, surveys of the Clouds were made after each new advance in southern hemisphere instrumentation and the principal surveys are listed and briefly described in Table I. They cover a range of frequencies from 19.7 MHz to 8.4 GHz. The early surveys at low frequencies were chiefly concerned with the overall synchrotron emission from the Clouds but, as resolution improved, emphasis has shifted to the individual sources, both emission nebulae and supernova remnants, which can be recognized as Cloud members. Of recent years the unique position of the Clouds for studying radio sources in external galaxies has been undermined by the development of powerful synthesis telescopes in the northern hemisphere; these have provided equivalent sensitivity and better spatial resolution on M31, and several other northern galaxies can also be studied effectively. However, with the commissioning of the Molonglo Observatory Synthesis Telescope (MOST) in 1981 the Clouds have been restored to their rightful place befitting the closest galaxies.

scholarly journals Radio-continuum study of the supernova remnants in the large Magellanic Cloud: An SNR with a highly polarized breakout region: SNR J0455-6838

2008 ◽  
pp. 61-66 ◽  
Author(s):  
E.J. Crawford ◽  
M.D. Filipovic ◽  
Horta de ◽  
F.H. Stootman ◽  
J.L. Payne
Keyword(s):  
Supernova Remnants ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Strong Polarization ◽  
High Polarization ◽  
Moderate Resolution ◽  
Typical Appearance ◽  
D 43

We present the results of new moderate resolution ATCA observations of SNR J0455-6838. We found that this SNR exhibits a mostly typical appearance with rather steep and curved ?=-0.81?0.18 and D=43?31?1 pc. Regions of high polarization were detected, including unusually strong (~70%) region corresponding to the northern breakout. Such a strong polarization in breakout regions has not been observed in any other SNR.

scholarly journals Radio Continuum of the Small Magellanie Cloud at Wavelengths 6 and 3·4 cm

1976 ◽  
Vol 29 (4) ◽  
pp. 329 ◽  
Author(s):  
RX McGee ◽  
Lynette M Newton ◽  
PW Butler
Keyword(s):  
Neutral Hydrogen ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Radio Sources ◽  
Spectral Indices ◽  
Small Magellanic Cloud ◽  
Ionized Gas

The radio continuum at wavelength 6 cm has been surveyed in the direction of the Small Magellanic Cloud with a telescope beam of 4'�1 arc. Only 27 radio sources have been delineated in this galaxy, and details of their positions, flux densities and spectral indices are given. Some supporting observations were made of the stronger sources at 3�4 cm wavelength. The distribution of the 6 cm emission is compared with the distributions of the ionized gas and neutral hydrogen.

scholarly journals Multi-wavelength View of the Interstellar Medium in the Large Magellanic Cloud

1998 ◽  
Vol 15 (1) ◽  
pp. 136-140
Author(s):  
You-Hua Chu
Keyword(s):  
Interstellar Medium ◽  
Supernova Remnants ◽  
Optical Emission ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Emission Lines ◽  
X Rays ◽  
Multi Wavelength ◽  
The Relationship

AbstractThe Large Magellanic Cloud (LMC) has been surveyed in optical emission lines, X-rays, radio continuum, HI, and CO lines. These surveys provide views of the interstellar medium (ISM) in the LMC of unprecedented clarity, allowing us to study astrophysical processes and to examine the relationship among the different phases of the ISM. Multi-wavelength images are used to illustrate the physical structures of supernova remnants, superbubbles, and supergiant shells, as well as the global interstellar structure of the LMC.

scholarly journals The Radio Continuum of the Large Magellanic Cloud. III. The Sources at 11 cm Wavelength

1972 ◽  
Vol 25 (5) ◽  
pp. 613 ◽  
Author(s):  
RX McGee ◽  
JW Brooks ◽  
RA Batchelor
Keyword(s):  
Radio Telescope ◽  
Large Magellanic Cloud ◽  
Low Noise ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Noise Correlation ◽  
Radio Sources ◽  
Radio Brightness ◽  
Correlation Radiometer ◽  
30 Doradus

A catalogue is given of radio sources observed in the Large Magellanic Cloud at 11 cm wavelength. A map of the radio brightness in the 30 Doradus region is included. The observations were made with a low-noise correlation radiometer and the Parkes 64 m radio telescope.

Five Mature Supernova Remnants in the Large Magellanic Cloud

1998 ◽  
Vol 115 (3) ◽  
pp. 1057-1075 ◽  
Author(s):  
John R. Dickel ◽  
D. K. Milne
Keyword(s):  
Supernova Remnants ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud

scholarly journals New optically identified supernova remnants in the Large Magellanic Cloud

2020 ◽  
Vol 500 (2) ◽  
pp. 2336-2358
Author(s):  
Miranda Yew ◽  
Miroslav D Filipović ◽  
Milorad Stupar ◽  
Sean D Points ◽  
Manami Sasaki ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Supernova Remnant ◽  
Narrow Band Imaging ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Main Body ◽  
Found Objects ◽  
Type Ia ◽  
Optical Sample

ABSTRACT We present a new optical sample of three Supernova Remnants (SNRs) and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud (LMC). These objects were originally selected using deep H α, [S ii], and [O iii] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC’s main body. Together with previously suggested MCSNR J0541–6659, we confirm the SNR nature for two additional new objects: MCSNR J0522–6740 and MCSNR J0542–7104. Spectroscopic follow-up observations for 12 of the LMC objects confirm high [S ii]/H α emission-line ratios ranging from 0.5 to 1.1. We consider the candidate J0509–6402 to be a special example of the remnant of a possible type Ia Supernova (SN) which is situated some 2° (∼1.75 kpc) north from the main body of the LMC. We also find that the SNR candidates in our sample are significantly larger in size than the currently known LMC SNRs by a factor of ∼2. This could potentially imply that we are discovering a previously unknown but predicted, older class of large LMC SNRs that are only visible optically. Finally, we suggest that most of these LMC SNRs are residing in a very rarefied environment towards the end of their evolutionary span where they become less visible to radio and X-ray telescopes.

scholarly journals Compact Structure in Continuum Radio Sources

1991 ◽  
Vol 44 (6) ◽  
pp. 771
Author(s):  
RT Schilizzi
Keyword(s):  
Supernova Remnants ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Compact Structure ◽  
Scale Structures ◽  
Continuum Radio

Present-day VLBI networks make observations of compact structure in a wide variety of radio sources. Examples are shown of milli-arcsecond scale structures in radio galaxies, quasars, stars and supernova remnants.

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