Other
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19411603r&link_type=abstract
American Astronomical Society Meeting 194, #116.03
Other
1
Scientific paper
The imaging data from the Sloan Digital Sky Survey (SDSS) provides the basis for a powerful gravitational lens survey as it allows the photometric selection of a large number of quasars. It is expected that the photometric sample will contain of order 1000 gravitationally lensed QSOs. On the order of 100 of these will be brighter than the SDSS spectroscopic limit. Thus the SDSS will discover substantially more lenses than are currently known. The majority of the lens candidates will not meet the SDSS spectroscopic criteria and will have to be observed with other telescopes. We describe the preliminary selection algorithms for spectroscopic followup along with the results of the first followup spectroscopy using the ARC 3.5m telescope at Apache Point Observatory. In the commissioning phase imaging data from 1998 we recovered both known binary/lensed quasars in the area scanned. Additionally we discovered a binary compact emission line galaxy at a redshift of 0.259 with 6.07arcsec separation. Further spectroscopic and imaging observations over the next few years offers the possibility of determining H_o and of constraining Lambda .
Annis J. A.
Cooray Asantha R.
Dodelson Scott
Frieman Joshua A.
Jo Newberg Heidi
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