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Redshift in quasar 3C 273


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About this observation
Kevin Gurney
Time of observation
25/03/2017 - 03:05
3C 273
Observing location
West Sheffield
Celestron 8SE
Alpy 600
Atik 630EX
0.63 FR
3 x 10min subs

3C 273 is a quasar at around 2.5GLy away with a published redshift of 0.15. Since learning to use the Alpy spectrograph I have wanted to observe the cosmological redshift of a distant object, and this quasar is a classic 'testbed' for doing this as I believe its the brightest of its type. However, it was a challenge for me because, at mag 13.0, in West Sheffield suburbia, the signal in the spectrum  was getting lost in the skyglow lines. I eventually got something useable after binning at 2x2 (trying 4x4 next time).

Comparison of the smoothed spectrum with professional data shows (I think) a reasonably good match of the main features and my estimated redshift was close to that reported there.

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