TY - JOUR
T1 - New optically identified supernova remnants in the Large Magellanic Cloud
AU - Yew, Miranda
AU - Filipović, Miroslav D.
AU - Stupar, Milorad
AU - Points, Sean D.
AU - Sasaki, Manami
AU - Maggi, Pierre
AU - Haberl, Frank
AU - Kavanagh, Patrick J.
AU - Parker, Quentin A.
AU - Crawford, Evan J.
AU - Vukotić, Branislav
AU - Urošević, Dejan
AU - Sano, Hidetoshi
AU - Seitenzahl, Ivo R.
AU - Rowell, Gavin
AU - Leahy, Denis
AU - Bozzetto, Luke M.
AU - Maitra, Chandreyee
AU - Leverenz, Howard
AU - Payne, Jeffrey L.
AU - Park, Laurence A. F.
AU - Alsaberi, Rami Z. E.
AU - Pannuti, Thomas G.
PY - 2021
Y1 - 2021
N2 - 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 2ð (∼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.
AB - 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 2ð (∼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.
UR - https://hdl.handle.net/1959.7/uws:61071
U2 - 10.1093/mnras/staa3382
DO - 10.1093/mnras/staa3382
M3 - Article
SN - 0035-8711
VL - 500
SP - 2336
EP - 2358
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -