scholarly journals An ATCA radio-continuum study of the Small Magellanic Cloud – V. Long-slit optical spectroscopy of supernova remnants and confirmation of a new candidate supernova remnant

2007 ◽  
Vol 376 (4) ◽  
pp. 1793-1804 ◽  
Author(s):  
J. L. Payne ◽  
G. L. White ◽  
M. D. Filipović ◽  
T. G. Pannuti
Keyword(s):  
Optical Spectroscopy ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Small Magellanic Cloud

scholarly journals The supernova remnant population of the Small Magellanic Cloud

2019 ◽  
Vol 631 ◽  
pp. A127 ◽  
Author(s):  
Pierre Maggi ◽  
Miroslav D. Filipović ◽  
Branislav Vukotić ◽  
Jean Ballet ◽  
Frank Haberl ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Ambient Medium ◽  
Line Emission ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Core Collapse ◽  
Small Magellanic Cloud ◽  
X Ray ◽  
The Difference

Aims. We present a comprehensive study on the supernova remnant (SNR) population of the Small Magellanic Cloud (SMC). We measured multiwavelength properties of the SMC SNRs and compare them to those of the Large Magellanic Cloud (LMC) population. Methods. This study combines the large dataset of XMM-Newton observations of the SMC, archival and recent radio continuum observations, an optical line emission survey, and new optical spectroscopic observations. We were therefore able to build a complete and clean sample of 19 confirmed and four candidate SNRs. The homogeneous X-ray spectral analysis allowed us to search for SN ejecta and Fe K line emission, and to measure interstellar medium abundances. We estimated the ratio of core-collapse to type Ia supernova rates of the SMC based on the X-ray properties and the local stellar environment of each SNR. Results. After the removal of unconfirmed or misclassified objects, and the addition of two newly confirmed SNRs based on multi-wavelength features, we present a final list of 21 confirmed SNRs and two candidates. While no Fe K line is detected even for the brightest and youngest SNR, we find X-ray evidence of SN ejecta in 11 SNRs. We estimate a fraction of 0.62–0.92 core-collapse supernova for every supernova (90% confidence interval), higher than in the LMC. The difference can be ascribed to the absence of the enhanced star-formation episode in the SMC, which occurred in the LMC 0.5–1.5 Gyr ago. The hot-gas abundances of O, Ne, Mg, and Fe are 0.1–0.2 times solar. Their ratios, with respect to SMC stellar abundances, reflect the effects of dust depletion and partial dust destruction in SNR shocks. We find evidence that the ambient medium probed by SMC SNRs is less disturbed and less dense on average than in the LMC, consistent with the different morphologies of the two galaxies.

scholarly journals An ATCA radio-continuum study of the Small Magellanic Cloud -- III. Supernova remnants and their environments

2005 ◽  
Vol 364 (1) ◽  
pp. 217-236 ◽  
Author(s):  
M. D. Filipovic ◽  
J. L. Payne ◽  
W. Reid ◽  
C. W. Danforth ◽  
L. Staveley-Smith ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Small 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 Comparison of Discrete Sources in Radio and Hα Surveys of the Magellanic Clouds and the Potential for the New Hα Survey

1998 ◽  
Vol 15 (1) ◽  
pp. 128-131 ◽  
Author(s):  
Miroslav D. Filipović ◽  
Paul A. Jones ◽  
Graeme L. White ◽  
Raymond F. Haynes
Keyword(s):  
Supernova Remnants ◽  
Hii Regions ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Small Magellanic Cloud

AbstractWe present a comparison between the latest Parkes radio surveys (Filipović et al. 1995, 1996, 1997) and Hα surveys of the Magellanic Clouds (Kennicutt & Hodge 1986). We have found 180 discrete sources in common for the Large Magellanic Cloud (LMC) and 40 in the field of the Small Magellanic Cloud (SMC). Most of these sources (95%) are HII regions and supernova remnants (SNRs). A comparison of the radio and Hα flux densities shows a very good correlation and we note that many of the Magellanic Clouds SNRs are embedded in HII regions.

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 The ASKAP EMU Early Science Project: radio continuum survey of the Small Magellanic Cloud

2019 ◽  
Vol 490 (1) ◽  
pp. 1202-1219 ◽  
Author(s):  
T D Joseph ◽  
M D Filipović ◽  
E J Crawford ◽  
I Bojičić ◽  
E L Alexander ◽  
...  
Keyword(s):  
Point Source ◽  
High Sensitivity ◽  
Magellanic Cloud ◽  
Point Sources ◽  
Radio Continuum ◽  
Continuum Emission ◽  
Small Magellanic Cloud ◽  
Science Project ◽  
New Radio ◽  
Low Surface Brightness

ABSTRACT We present two new radio continuum images from the Australian Square Kilometre Array Pathfinder (ASKAP) survey in the direction of the Small Magellanic Cloud (SMC). These images are part of the Evolutionary Map of the Universe (EMU) Early Science Project (ESP) survey of the Small and Large Magellanic Clouds. The two new source lists produced from these images contain radio continuum sources observed at 960 MHz (4489 sources) and 1320 MHz (5954 sources) with a bandwidth of 192 MHz and beam sizes of 30.0 × 30.0 arcsec2 and 16.3 × 15.1 arcsec2, respectively. The median root mean square (RMS) noise values are 186 $\mu$Jy beam−1 (960 MHz) and 165 $\mu$Jy beam−1 (1320 MHz). To create point source catalogues, we use these two source lists, together with the previously published Molonglo Observatory Synthesis Telescope (MOST) and the Australia Telescope Compact Array (ATCA) point source catalogues to estimate spectral indices for the whole population of radio point sources found in the survey region. Combining our ASKAP catalogues with these radio continuum surveys, we found 7736 point-like sources in common over an area of 30 deg2. In addition, we report the detection of two new, low surface brightness supernova remnant candidates in the SMC. The high sensitivity of the new ASKAP ESP survey also enabled us to detect the bright end of the SMC planetary nebula sample, with 22 out of 102 optically known planetary nebulae showing point-like radio continuum emission. Lastly, we present several morphologically interesting background radio galaxies.

scholarly journals A Radio Survey of the SMC at 843 MHz with the MOST: I. The Survey

1998 ◽  
Vol 15 (3) ◽  
pp. 280-298 ◽  
Author(s):  
A. J. Turtle ◽  
Taisheng Ye ◽  
S.W. Amy ◽  
Jennifer Nicholls
Keyword(s):  
Supernova Remnants ◽  
Angular Resolution ◽  
Magellanic Cloud ◽  
H Ii Regions ◽  
Small Magellanic Cloud ◽  
Radio Image ◽  
Extended Sources ◽  
Radio Survey

AbstractA radio survey at a frequency of 843 MHz of 36 square degrees containing the Small Magellanic Cloud (SMC) has been made with the Molonglo Observatory Synthesis Telescope (MOST). The angular resolution is around 45 arcsec and the rms noise is about 1 mJy per beam. The radio image of the region is presented showing over a thousand sources with a variety of angular sizes from unresolved to 10 arcmin. Most of the sources are presumed to be background objects but about 70 of the more extended sources are H II regions or supernova remnants within the SMC.

scholarly journals HFPK 334: AN UNUSUAL SUPERNOVA REMNANT IN THE SMALL MAGELLANIC CLOUD

2014 ◽  
Vol 148 (5) ◽  
pp. 99 ◽  
Author(s):  
E. J. Crawford ◽  
M. D. Filipović ◽  
R. L. McEntaffer ◽  
T. Brantseg ◽  
K. Heitritter ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Magellanic Cloud ◽  
Small Magellanic Cloud

scholarly journals New 20-cm radio-continuum study of the small Magellanic cloud - part III: Compact Hii regions

2012 ◽  
pp. 53-64 ◽  
Author(s):  
G.F. Wong ◽  
M.D. Filipovic ◽  
E.J. Crawford ◽  
N.F.H. Tothill ◽  
Horta de ◽  
...  
Keyword(s):  
Hii Regions ◽  
Magellanic Cloud ◽  
Radio Continuum ◽  
Spectral Indices ◽  
Emission Mechanism ◽  
Small Magellanic Cloud ◽  
Southwestern Part ◽  
Continuum Image ◽  
Compact Array ◽  
Compact Hii Regions

We present and discuss a new catalogue of 48 compact Hii regions in the Small Magellanic Cloud (SMC) and a newly created deep 1420 MHz (?=20 cm) radio-continuum image of the N19 region located in the southwestern part of the SMC. The new images were created by merging 1420 MHz radiocontinuum archival data from the Australian Telescope Compact Array. The majority of these detected radio compact Hii regions have rather flat spectral indices which indicates, as expected, that the dominant emission mechanism is of thermal nature.

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