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Strange ray in M31 spectrum
Posted: Wed Dec 14, 2016 9:44 am
by Robin Dave
- Spectre M31.jpg (98.92 KiB) Viewed 4380 times
Hi All,
There is a strange emission ray in my M31 Spectrum taken with Alpy 600. After accurate calibration it is found to be at 4853 angstrom. Could it be Hbeta or Argon?
The conditions where not good: full moon and fog.
I will try to take it again in better condition but I am curious where this ray comes from.
Robin
Re: Strange ray in M31 spectrum
Posted: Wed Dec 14, 2016 10:04 am
by etienne bertrand
Hello Robin,
I think it's a hot pixel.
Re: Strange ray in M31 spectrum
Posted: Wed Dec 14, 2016 10:37 am
by Robin Dave
Thank you Etienne.
Your are right it was a hot pixel.
Re: Strange ray in M31 spectrum
Posted: Wed Dec 14, 2016 10:55 pm
by etienne bertrand
Good observation, M31 is a interesting galaxy, have you calculted the redshift ?
Re: Strange ray in M31 spectrum
Posted: Thu Dec 15, 2016 9:11 am
by Robin Dave
Je trouve un décalage de de 6.4 angströms vers le bleu si j'utilise les raies du sodium mais seulement 3 angströms si je prends la raie à 5167.3 du magnésium. Donc une vitesse moyenne de 235 km/s.
Je ne suis pas certain qu'on puisse voir le doublet du sodium avec un alpy (pouvoir de résolution de 10 angströms). Sur le spectre la distance entre les 2 raies est de 7 angströms