Skip to main content

Questions tagged [crossmatching]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2 votes
1 answer
41 views

Why would some sources in a cross-matched DESI/SDSS catalog have different spectroscopic redshifts?

I've crossmatched quasars from DESI DR9 and from SDSS DR16. When I plot the spectroscopic redshift from each of the individual catalogs for each source, I get: Naively, I'd expect the $z_{spec}$ to ...
Jim421616's user avatar
  • 2,620