3C461 (Cas A)
Instrument : Celestron 11 (D
= 0.28 m) + LISA
spectrograph (click here for
technical informations) at R = 800 + Atik 314L+ CCD camera
Observatory : Castanet-Tolosan
Observer
: Christian Buil
Download poster here : poster_3c461.png
3C461 (Cas A) is the faint remnant
of supernova explosion observed by british astronomer John Flamsteed in 1680.
It is the youngest know Galactic supernova remnant.
The spectrum is complex
because the three-dimensional high velocities field and the knots structure
with a high diversity spectral signature.
The spectrum show fast-moving knots (FKMs), up to 11000 km/s, and slow-moving knots (200 km/s max) also called "Quasi Stationary Flocculi", QSFs.
My spectra shows clearly bright [O III] FKMs, concerning also sulfur element. Nitrogen QSF are also detected (section "S2" - below). The Halpha line is nearly absent (very faint in scan "S2") :
Click
here or in the image for enlarge.