- #1
shadishacker
- 30
- 0
Hi everyone,
I am new to observations and observational terms!
I am reading the paper "constraining the time variation of the fine-structure constant" by Srianand et. al
in the section "constraining alpha with QSO absorption lines" there is a sentence saying "... rest wavelengths of MG II ... thereby providing a good anchor for measuring the systematic redshift."
- What does the systematic redshift mean?
- What do they use Mg II for?
I am new to observations and observational terms!
I am reading the paper "constraining the time variation of the fine-structure constant" by Srianand et. al
in the section "constraining alpha with QSO absorption lines" there is a sentence saying "... rest wavelengths of MG II ... thereby providing a good anchor for measuring the systematic redshift."
- What does the systematic redshift mean?
- What do they use Mg II for?