EDP Sciences
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Volume 371, Number 1, May III 2001
Page(s) 300 - 311
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20010350

A&A 371, 300-311 (2001)
DOI: 10.1051/0004-6361:20010350

The peculiar supernova remnant CTB 80

F. Mavromatakis1, J. Ventura1, 2, 3, E. V. Paleologou2 and J. Papamastorakis1, 2

1  University of Crete, Physics Department, PO Box 2208, 710 03 Heraklion, Crete, Greece
2  Foundation for Research and Technology-Hellas, PO Box 1527, 711 10 Heraklion, Crete, Greece
3  Max Planck Institut für Extraterrestrische Physik, 85741 Garching, Germany

(Received 20 September 2000 / Accepted 2 March 2001)

Deep CCD exposures of the peculiar supernova remnant CTB 80 in the light of the H$\alpha+[$NII ], [SII ], [OII ], and [OIII ] filters have been obtained. These images reveal significant shock heated emission in the area of the remnant. An extended bright diffuse nebula in the south-east part of CTB 80 overlaps soft X-ray emission from ROSAT but it does not appear to be related to the remnant under study. New diffuse and filamentary structures are detected to the south, south-east, and north of PSR 1951+32, most likely associated with CTB 80. Especially, the sulfur line image shows emission in the north along the outer boundary of the IRAS and HI shells. The [OIII ] emission is filamentary, suggesting shock velocities greater than 100 km s-1 but its spatial extent is quite limited. Lower shock velocities are expected in the north and north-east areas of the remnant, since [OII ] emission is present, while [OIII ] line emission is not detected. The comparison between the [OIII ] and [OII ] line images further suggest the presence of significant inhomogeneities in the interstellar medium. The flux-calibrated images do not indicate the presence of incomplete recombination zones, and we estimate that the densities of the preshock clouds should not exceed a few atoms per cm3. The typical projected angular widths of the observed filaments are ~30´´. Typical surface brightness values of the long [OIII ] filament in the south are ~12 10-17 erg s-1 cm-2 arcsec-2 while the [OII ] image is characterized by fluxes of 10-20 10-17 erg s-1 cm-2 arcsec-2. The area covered by the optical radiation along with the radio emission at 1410 MHz suggest that CTB 80 occupies a larger angular extent than was previously known.

Key words: ISM: general -- ISM: supernova remnants -- ISM: individual objects: CTB 80

Offprint request: F. Mavromatakis, fotis@physics.uoc.gr

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