Spectroscopy of Quasar Candidates from SDSS Commissioning Data

Details Spectroscopy of Quasar Candidates from SDSS Commissioning Data Spectroscopy of Quasar Candidates from SDSS Commissioning Data

1998-12-15

arxiv.org/abs/astro-ph/9812280v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in the proceedings of "After the Dark Ages: When Galaxies were Young (the Universe at 2<z<5)", 9

Scientific paper

10.1063/1.58612

The Sloan Digital Sky Survey has obtained images in five broad-band colors for several hundred square degrees. We present color-color diagrams for stellar objects, and demonstrate that quasars are easily distinguished from stars by their distinctive colors. Follow-up spectroscopy in less than ten nights of telescope time has yielded 22 new quasars, 9 of them at $z> 3.65$, and one with $z = 4.75$, the second highest-redshift quasar yet known. Roughly 80% of the high-redshift quasar candidates selected by color indeed turn out to be high-redshift quasars.

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