The lowest redshifts (z = Δλ / λ₀) commonly observed for quasars are approximately:

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Quizplus · Accepted Answer

The lowest redshifts commonly observed for quasars are around z=0.3, with some reaching as low as z=0.1. This is because quasars are very luminous and can be observed at great distances, but as they are also very old they tend to have low redshifts due to the expansion of the universe. Higher redshifts are still observed, but the lowest commonly observed redshift is around 0.3.

The Lowest Redshifts (Z = Δλ / λ0) Commonly Observed

The Lowest Redshifts (Z = Δλ / λ₀) Commonly Observed