Messier 77 is a Seyfert galaxy with an active core that shows emission lines. Encouraged by the bright and star like core that is visible in the image which I took last year, I have tried to obtain a low resolution spectrum of this object with the slitless SA-200 setup:
The H alpha Balmer line and the forebidden [O III] line are indeed visible as emission lines on a broad continuum:
The emmission lines should show a redshift (H alpha approx. 24 Angstrom). What would be the best method to measure this redshift with my slitless low resolution setup (if possible at all)??
Edited by mwr, 31 December 2019 - 10:46 AM.