New Optically Identified Supernova Remnants in the Large Magellanic
  Cloud
  We present a new optical sample of three Supernova Remnants and 16 Supernova
Remnant (SNR) candidates in the Large Magellanic Cloud(LMC). These objects were
originally selected using deep H$\alpha$, [SII] and [OIII] 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 MCSNRJ0542-7104. Spectroscopic follow-up observations for
12 of the LMC objects confirm high [SII]/H$\alpha$ a 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 which is situated some
2$^\circ$ ($\sim 1.75$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 $\sim 2$. 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.
