Scientists from Johns Hopkins
are responsible for construction of two spectrographs and for the
science data archive for all data. Two large, dual-channel spectrographs
cover the wide wavelength range from the ultraviolet to the
infrared. Each is fed with 320 fibers aligned with astronomical objects
in the telescope's focal plane. The entire spectroscopic system allows
the measuring of 640 spectra per hour of observation time. Red shifts
determined from the data provide distances to quasars and galaxies, the
third dimension of the Sky Survey.
Making the enormous volume of data from the Sky Survey available for
study is an important challenge of the collaboration. Scientists from
Johns Hopkins have responsibility for the design of the science database
and of the user interfaces for accessing it. The terabyte database
consists of an electronic archive of information from the operations
database created from the data pipelines, in a format readily accessible
to Survey scientists and others.
Participants from Johns Hopkins:
John Doug Reynolds
* denotes a Builder of the SDSS.