OSG Document 260-v1

Sloan Digital Sky Survey - Quasar Spectra

Document #:
OSG-doc-260-v1
Document type:
Presentations
Submitted by:
Mari Herrera
Updated by:
Selitha Raja
Document Created:
16 Aug 2005, 09:46
Contents Revised:
16 Aug 2005, 09:46
Metadata Revised:
08 Feb 2007, 15:34
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Abstract:
Sloan Digital Sky Survey - Quasar Spectra
When the radio source 3C29 was found to be at a remarkably large redshift, the term ``quasi-stellar object'' (QSO) described what we knew about that kind of object -- it looked like a star (unresolved point source), but clearly was not a star due its enormous intrinsic brightness. To understand the physical processes powering these objects, surveys to locate and characterize them initially searched radio sources for star-like images inoptical wavelengths.

The Sloan Digital Sky Survey has measured spectra of over 50,000 QSOs. Quasar spectra are a composite of broad and narrow emission lines, power law continuum, balmer continuum, Ly-a forest, and absorption lines. Standard fitting algorithms are overwhelmed by the number of free parameters Genetic algorithms offer an efficienct way to search parameter space for good solutions. These solutions are accurate enough to enable science on a largesample of quasars.

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Consortium Mtg: Milwaukee held from 20 Jul 2005 to 22 Jul 2005
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