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For a x-match query matching a catalog to the ls_dr8.tractor catalog, the flux values for the wise columns are spurious. This only occurs for sources with ls_dr8 south declinations, while the mag_w* columns appear to correspond to the correct values.

See quick diagnostic plots here: https://imgur.com/a/zcRwVwU
asked Oct 2, 2020 by anonymous | 71 views

1 Answer

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Thank you for your observations and diagnostic plots. Taking a look into this.
answered Oct 2, 2020 by ascottdemo (1,280 points)
If you query ls_dr8.tractor_s do you get the same issue?
When querying a cone in ls_dr8.tractor_s i dont find this issue. Seems to be limited to the results from the x-match tool.
Not sure why I didn't notice before now, but it looks like the issue is simply that the flux_w[1234] and flux_ivar_w[1234] columns are swapped for the ls_n sources.
Thank you for finding this issue!

We remedied this and is in process of being deployed to production.  Will post back here once completed.
This is remedied now.  Thank you for letting us know.

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