Optical observations of the supernova remnant G 69.4+1.2

Free access article

Issue		A&A Volume 387, Number 2, May IV 2002


Page(s)		635 - 641
Section		Diffuse matter in space
DOI		http://dx.doi.org/10.1051/0004-6361:20020398

A&A 387, 635-641 (2002)
DOI: 10.1051/0004-6361:20020398

Optical observations of the supernova remnant G 69.4+1.2

F. Mavromatakis¹, P. Boumis¹ and E. V. Paleologou²

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

(Received 12 December 2001 / Accepted 13 March 2002)

Abstract
We performed deep optical observations of the area of the new supernova remnant G 69.4+1.2 in the emission lines of [ $\ion{O}{iii}$ ], H $\alpha+[$ $\ion{N}{ii}$ ] and [ $\ion{S}{ii}$ ]. The low ionization images reveal diffuse and filamentary emission in the central and south, south-west areas of our field. Estimates of the [ $\ion{S}{ii}$ ]/H $\alpha$ ratio suggest that the detected emission in these areas originates from shock heated gas, while the strong extended source in the north must be an $\ion{H}{ii}$ region. The medium ionization image of [ $\ion{O}{iii}$ ] shows a single filament close to the field center. Emission from [ $\ion{O}{iii}$ ] is not detected elsewhere in the field but only in the north from LBN 069.96+01.35. Deep long-slit spectra taken at the position of the [ $\ion{O}{iii}$ ] filament suggest shock velocities ~120 km s ^-1, while in other areas velocities around 50 km s ^-1 are expected. The sulfur lines ratio indicates electron densities less than 120 cm ^-3. The absolute H $\alpha$ flux is ~5 $\times$ 10^-17 erg s ^-1 cm ^-2 arcsec ^-2. The optical emission is very well correlated with the radio emission, especially in the south west. The soft X-ray emission detected in the ROSAT All-Sky survey shows a satisfactory degree of correlation with the optical data in the south-west suggesting their association.

Key words: ISM: general -- ISM: supernova remnants -- ISM: individual objects: G 69.4+1.2

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

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