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Redshift in quasar 3C 273

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About this observation
Observer
Kevin Gurney
Time of observation
25/03/2017 - 03:05
Object
3C 273
Observing location
West Sheffield
Equipment
Celestron 8SE
Alpy 600
Atik 630EX
AZ-EQ6
0.63 FR
Exposure
3 x 10min subs
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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.

Comments

Nick Atkinson's picture

Well done and who would have thought this was possible with amatuer equipment

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