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DESIHIGH / desihigh

An introduction to DESI & Dark Energy for high schoolers with hot-off-the-telescope data! :telescope:
BSD 3-Clause "New" or "Revised" License
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how to find a source using ra/dec #123

Open ParyagSharma opened 12 months ago

ParyagSharma commented 12 months ago

If we have a tile id we can simply find that in the desi data library here- https://data.desi.lbl.gov/public/edr/ and plot the spectrum. but what to do if we have a a ra dec and we want to find a spectrum of the source with that ra and dec. What I want to do is to match the sources which are in both desi and sdss, but I cannot find a table anywhere which shows like the ra,dec of all the sources that desi observed in the early data release, what should I do ?

alxogm commented 12 months ago

Hi @ParyagSharma thanks for your question!. You can find the RA, DEC of DESI EDR observed targets in the redshift catalog, for instance in per healpix catalog here the relevant columns would be TARGET_RA and TARGET_DEC, and you'll have to make the match with the ra,dec you are looking for. If you have access to NERSC, this tutorial shows how to access the catalog, if you don't you could look at this branch .

You can also look at this similar question and if neither of these fully respond to your question I suggest you make the question in the DESI data Q&A forum as well.

Here in desihigh we'll be happy to help further if you think you need more basic help than what can be provided by the DESI data team.

ParyagSharma commented 12 months ago

Thank you @alxogm for the guidance!