Skip to main content Accessibility help
×
Home

Cataloging the Northern Sky Using a New Generation of Software Technology

  • N. Weir (a1), S. Djorgovski (a1), U. Fayyad (a2), J.D. Smith (a1) and J. Roden (a2)...

Abstract

We have developed a system, called SKICAT, for producing, managing and analyzing catalogs from the digitized POSS-II survey. The system classifies and matches catalogs from multiple, overlapping plate scans as well as CCD calibration sequences; and it can be used for the scientific analysis of the resulting catalogs. It incorporates a number of novel machine-learning and AI tools, including the star/galaxy classification using decision tree algorithms. This results in star/galaxy separation accurate to 90% or better down to B J ∼ 21 m , i.e. ∼ 1 m above the plate limit The final catalog is expected to contain at least 5 × 107 galaxies and > 2 × 109 stars. We present preliminary results on galaxy counts from a test region near the NGP. We find a mild excess over the no-evolution models, smaller than previously found by the APM group. A search for z > 4 quasars and the two-point correlation analysis of this data set are in progress.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Cataloging the Northern Sky Using a New Generation of Software Technology
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Cataloging the Northern Sky Using a New Generation of Software Technology
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Cataloging the Northern Sky Using a New Generation of Software Technology
      Available formats
      ×

Copyright

References

Hide All
Cheeseman, P., et al., 1988. In ‘Proc. Fifth Machine Learning Workshop’, San Mateo, CA, Morgan Kauffmann Publ., p. 54.
Djorgovski, S., Lasker, B., Weir, N., Postman, M., Reid, I.N. and Laidler, V., 1992. B.A.A.S., 24, 750.
Ellis, R., 1987. In ‘Observational Cosmology’, IAU Symp. 124, eds. Hewitt, A. et al, Reidel, Dordrecht, p. 367.
Fayyad, U., Doyle, R., Weir, N. and Djorgovski, S., 1992. In ‘Proceedings of the ML-92 Workshop on Machine Discovery (MD-92)’, San Mateo, CA, ed. Zytkow, J., Morgan Kaufmann Publ., p. 117.
Fayyad, U., Weir, N., Roden, J., Djorgovski, S. and Doyle, R., 1993a. In ‘Sixth Annual Workshop on Space Operations, Applications and Research (SOAR-92)’, NASA CP-3187, ed. Krishen, K., p. 340.
Fayyad, U.M., Weir, N. and Djorgovski, S., 1993b. In ‘Proc. Tenth International Conference on Machine Learning’, San Mateo, CA, Morgan Kaufmann Publ., p. 112.
Fayyad, U., Weir, N. and Djorgovski, S., 1993c. In ‘Proc. Second International Conference on Information and Knowledge Management (CIKM-93)’, Washington: ISCA/ACM, in press.
Irwin, M., McMahon, R. and Hazard, C., 1991. In ‘The Space Distribution of Quasars’, ed. Crampton, D., ASPCS, 21, 117.
Jarvis, J. and Tyson, J.A., 1979. Proc. SPIE, 172, 422.
Koo, D. and Kron, R., 1992. ARAA, 30, 613.
Lasker, B., Djorgovski, S., Postman, M., Laidler, V., Weir, N., Reid, I.N. and Sturch, C., 1992. B.A.A.S., 24, 741.
Maddox, S., Sutherland, W., Efstathiou, G., Loveday, J. and Peterson, B., 1990. Mon. Not. R. astron. Soc., 247, 1P.
Reid, I.N. and Djorgovski, S., 1993. In ‘Sky Surveys: Protostars to Protogalaxies’, ed. Soifer, B.T., ASPCS, 43, 125.
Valdes, F., 1982. Proc. SPIE, 331, 465.
Weir, N., Djorgovski, S. and Fayyad, U., 1992. B.A.A.S., 24, 1139.
Weir, N., Djorgovski, S., Fayyad, U., Roden, J. and Rouquette, N., 1993a. In ‘Astronomy from Large Data Bases II’, eds. Heck, A. and Murtagh, F., ESO CWP-43, 513.
Weir, N., Fayyad, U., Djorgovski, S., Roden, J. and Rouquette, N., 1993b. In ‘Astronomical Data Analysis Software and Systems II’, eds. Hanisch, R., Brissenden, R. and Barnes, J., ASPCS, 52, 39.

Cataloging the Northern Sky Using a New Generation of Software Technology

  • N. Weir (a1), S. Djorgovski (a1), U. Fayyad (a2), J.D. Smith (a1) and J. Roden (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed