C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET20:22:37

2003A&A...408..237M - Astronomy and Astrophysics, volume 408, 237-243 (2003/9-2)

Deep optical observations of the supernova remnant G 78.2+2.1.


Abstract (from CDS):

The wide-field covered by the supernova remnant G 78.2+2.1 was observed in the optical emission lines of Hα+[NII], [SII] and [OIII]. The flux calibrated images reveal several HII regions in the field which dominate the optical emission but we were able to identify possible areas of shock-heated emission through the Hα+[NII] and [SII] images. These are mainly found to the north-east of γ Cygni as well as in the south and the morphology of the detected emission is patchy and diffuse. A few patchy structures are also detected in the medium ionization line image of [OIII]. Long-slit spectra taken at one of the candidate positions verify that we have detected radiation from shock-heated gas ([SII]/Hα≃0.6). The estimated shock velocity lies below 100km/s, while the measured electron density of ∼700cm–3 implies preshock cloud densities of ∼20cm–3. High resolution maps in the infrared show that the optical emission, which may be associated with G 78.2+2.1, lies in areas relatively free of infrared emission. The interstellar extinction measured through the optical spectra is compatible with current estimates of the distance to the remnant. The optical data are in agreement with the explosion energy and interstellar medium density estimated from the X-ray data suggesting that the remnant is still in the adiabatic phase of its evolution. A second set of spectra taken in the north-west suggests that we are probably dealing with a foreground HII region.

Abstract Copyright:

Journal keyword(s): ISM: general - ISM: supernova remnants - ISM: individual objects: G 78.2+2.1

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 196 2
2 GRO J2019+40 gam 20 21.5 +40 26           ~ 126 1
3 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 201 2
4 NGC 6910 OpC 20 23 08 +40 46.5   7.13 7.4     ~ 160 0

    Equat.    Gal    SGal    Ecl

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