Issue |
A&A
Volume 443, Number 1, November III 2005
|
|
---|---|---|
Page(s) | 175 - 183 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20053484 | |
Published online | 21 October 2005 |
Deep optical observations of the supernova remnants G 126.2+1.6, G 59.8+1.2 and G 54.4-0.3
1
Institute of Astronomy & Astrophysics, National Observatory of Athens, I. Metaxa & V. Paulou, P. Penteli, 15236 Athens, Greece e-mail: ptb@astro.noa.gr
2
University of Crete, Physics Department, PO Box 2208, 710 03 Heraklion, Crete, Greece
3
Technological Education Institute of Crete, General Department of Applied Science, PO Box 1939, 71004 Heraklion, Crete, Greece
4
Astronomical Laboratory, Department of Physics, University of Patras, 26500 Rio-Patras, Greece
5
Department of Physics, National University of Ireland Galway, Galway, Ireland
Received:
20
May
2005
Accepted:
21
July
2005
Optical CCD imaging and spectroscopic observations of three
supernova remnants are presented. Optical emission from G 54.4-0.3
and G 59.8+1.2 is detected for the first time, while the first flux
calibrated CCD images of the supernova remnant G 126.2+1.6 were
performed in the optical emission lines of H], [
] and [
]. A
mixture of filamentary and diffuse structures is observed in G 54.4-0.3
and G 59.8+1.2, mainly in H
], while the deep optical images of G
126.2+1.6 reveal several new filamentary and diffuse structures
inside the extent of the remnant as defined by its known radio
emission. In all cases, the radio emission is found to be well
correlated with the optical filaments. [
] emission was not
detected at G 54.4-0.3 and G 59.8+1.2 while in G 126.2+1.6,
significant morphological differences between the low and medium
ionization images are present suggesting incomplete shock
structures. Deep long-slit spectra were taken at different positions
of the remnants. Both the flux calibrated images and the long-slit
spectra clearly show that the emission originates from shock-heated
gas, while some spectra of G 126.2+1.6 are characterized by large
[
]/Hβ ratios. This remnant's [
] flux suggests shock velocities
into the interstellar “clouds” between 100 and 120 km s-1, while the
[
] absence in the other two remnants indicates slower shock
velocities. For all remnants, the [
ratio indicates electron
densities below 600 cm-3 with particularly low densities for G
54.4-0.3 (below 50 cm-3). Finally, the Hα emission has been
measured to be between 3.0 to 15.2
10-17 erg s-1 cm-2 arcsec-2, 3.2
10-17 erg s-1 cm-2 arcsec-2 and between 6.5 to 16.8
10-17 erg s-1 cm-2 arcsec-2 for G 54.4-0.3, G 59.8+1.2
and G 126.2+1.6, respectively.
Key words: ISM: general / ISM: supernova remnants / ISM: individual objects: G 54.4-0.3, G 59.8+1.2, G 126.2+1.6
© ESO, 2005
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