The Status of DPOSS, and Some Initial Scientific APplications

Details The Status of DPOSS, and Some Initial Scientific APplications The Status of DPOSS, and Some Initial Scientific APplications

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.0414d&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #04.14; Bulletin of the American Astronomical Society, Vol. 31, p.828

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The Digital POSS-II (DPOSS) and the resulting Palomar-Norris Sky Catalog (PNSC) are now nearing completion, with the first anticipated data releases within a few months. The survey covers the entire sky north of delta = -3(deg) in 3 bands, photographic JFN calibrated to the Gunn gri system, reaching to equivalent limiting magnitude of Blim ~ 22(m) . As a result of optimal digitisation of the plates, detailed processing of the scans, and a very extensive CCD calibration program, the data quality exceedes that of the previous photographically-based efforts. Object classification is performed using Artificial Neural Nets, Decision Trees, and other techniques. The end product (PNSC) is expected to contain > 50 million galaxies and > 2 billion stars. Numerous scientific projects utilising these data have been started. DPOSS galaxy counts in 3 bands are described elsewhere at this meeting by Odewahn et al. They serve as a low-z baseline for deeper galaxy counts and studies of galaxy evolution. We are also using our galaxy catalogs to obtain new measurements of galaxy clustering and large-scale structure. A new catalog of ~ 20,000 galaxy clusters selected in an objective and statistically well understood manner, is being produced. Using the catalogs of stellar objects, we search for quasars at z > 4 using gri color selection; to date, over 60 have been found. They are used for a variety of follow-up studies. We also look for stellar objects with extreme or peculiar colors or variability, including optical transients. There is even an exciting possibility of discovering some previously unknown, rare type of objects, and at least one such source has been found. DPOSS catalogs are already used for optical IDs of sources found at other wavelengths, e.g., radio surveys, and especially the 2MASS. Finally, our galaxy catalogs are used by a number of other groups for their redshift surveys, e.g., the Palomar-Norris survey, and perhaps including also the Sloan DSS early observations. We will present a new photometric catalog of the Coma cluster region, created for this purpose.

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