First optical light from the supernova remnant G 17.4-2.3

Abstract

Deep optical CCD images of the supernova remnant G 17.4-2.3 were obtained and faint emission has been discovered. The images, taken in the emission lines of Halpha+[N II], [S II] and [O III], reveal filamentary structures in the east, south-east area, while diffuse emission in the south and central regions of the remnant is also present. The radio emission in the same area is found to be well correlated with the brightest optical filament. The flux calibrated images suggest that the optical filamentary emission originates from shock-heated gas ([S II]/Halpha > 0.4), while the diffuse emission seems to originate from an HII region ([S II]/Halpha < 0.3). Furthermore, deep long-slit spectra were taken at the bright [O III] filament and clearly show that the emission originates from shock heated gas. The [O III] flux suggests shock velocities into the interstellar "clouds" greater than 100 km/s, while the [S II] 6716/6731 ratio indicates electron densities ~240 cm^{-3}. Finally, the Halpha emission has been measured to be between 7 to 20 x 10^{-17} erg s^{-1} cm^{-2} arcsec^{-2}.

6 pages, 5 figures, accepted for publication in A&A

References in corpus (2)

• The supernova remnants G67.7+1.8, G31.5-0.6 and G49.2-0.7
• Imaging and spectroscopy of the faint remnant G 114.3+0.3

Cited by in corpus (11)

• Distances, Radial Distribution and Total Number of Galactic Supernova Remnants
• A multi-wavelength study of Supernova Remnants in six nearby galaxies. II. New optically selected Supernova Remnants
• Multi-wavelength study of the G 82.2+5.3 supernova remnant
• New optical filamentary structures in Pegasus
• Optical Discovery of an Apparent Galactic Supernova Remnant G159.6+7.3
• Deep optical observations of the supernova remnants G 126.2+1.6, G 59.8+1.2 and G 54.4-0.3
• First optical detection from the supernova remnant G 15.1-1.6
• XMM-Newton and Chandra observations of G272.2-3.2. Evidence of stellar ejecta in the central region
• How do supernova remnants cool? -- I. Morphology, optical emission lines, and shocks
• Optical observations of the supernova remnant G 69.4+1.2
• Optical Imaging and Spectroscopic Observation of the Galactic Supernova Remnant G85.9-0.6