Quasar Wedge Plot

QSO wedge plot

Each dot represents the location of one quasar, with spectroscopically measured redshift, from the SDSS Early Data Release. All of the objects are near the celestial equator (declination = 0). The position around the circle is determined by the object's right ascension, and the distance from the center increases with the object's redshift. The quasar population extends to a redshift of 5.
Image credit: Chris Stoughton, SDSS Collaboration

This image is also available as a PostScript file (122 KB).

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