Practice 4. What are the highest-redshift
quasars in the SDSS database?
Write a query to search for quasars for which we have
obtained spectra (search the specObj table) with
redshifts greater than 4.5 and high confidence measurements. Be sure to retrieve
both quasars and the objects classified as high-redshift quasars.
Retrieve each quasar's Photo ID, ra, dec, and redshift.
How many results do you get? |