red shift

• by VITREO

  looking for the red shift in spectra I noticed that not all galaxies have this data.
  WHY?

  Posted January 28, 2017 11:57 AM

• by Budgieye moderator

  £ $ € It costs money to get red shifts in SDSS, so only some galaxies are sampled. See the links below to see how spectra are made.

  Additional hints to find a spectrum.

  In SDSS, click on "All Spectra".

  In SDSS, go into Navigate, and click on Spectra to see if another part of the galaxy has a spectra

  Go into NED, and click on spectra.

  Go into NED, and read some of the articles, but that is much work, especially since most are in English.

  https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=7

  7.1 Spectral Charts, MaNGA https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=7

  7.2 Redshift z and photometric Z (PhotoZ) https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=7

  7.3 Measure distance https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=7

  Posted January 28, 2017 3:17 PM