We present new diagnostic tools for distinguishing supernova remnants (SNRs) from H ii
regions. Up to now, sources with flux ratio [S ii]/H higher than 0.4 have been considered as …

We present the first optical study of the supernova remnant (SNR) G7. 7–3.7, with the aim of
determining its evolutionary phase since it has been suggested to be the remnant of SN 386 …

Galactic supernova remnants (SNRs) with angular dimensions greater than a few degrees
are relatively rare, as are remnants located more than 10 off the Galactic plane. Here we …

Charged particles can be accelerated to high energies by collisionless shock waves in
astrophysical environments, such as supernova remnants. By interacting with the …

As part of a systematic search programme of a 10° wide strip of the northern Galactic plane,
we present preliminary evidence for the discovery of four (and possibly five) new supernova …

Supernovae (SNe) inject∼ 1051 erg in the interstellar medium, thereby shocking and
heating the gas. A substantial fraction of this energy is later lost via radiative cooling. We …

We present the first results from an imaging and a spectroscopic survey of the optical
emission associated with supernova remnant (SNR) G107. 5− 1.5. We discovered optical …

Deep optical emission-line images are presented for nine known plus three new Galactic
supernova remnants (SNRs), all but one having at least one angular dimension> 1. Wide …

Wide-field H α images of the Galactic plane have revealed a new supernova remnant (SNR)
nearly 3 deg in diameter centred at l= 107.0, b=+ 9.0. Deep and higher resolution H α and [O …

We present optical CCD images of the large supernova remnant (SNR) G 132.7+ 1.3 (HB3)
covering its full extent for the first time, in the emission lines of Hα+[N ii],[S ii], and [O iii] …