[ { "id": "authors:0cbxq-s8r44", "collection": "authors", "collection_id": "0cbxq-s8r44", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190723-160758075", "type": "book_section", "title": "Exploration of Large Digital Sky Surveys", "book_title": "Mining the Sky", "author": [ { "family_name": "Djorgovski", "given_name": "S. G.", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "Brunner", "given_name": "R. J.", "clpid": "Brunner-R-J" }, { "family_name": "Mahabal", "given_name": "A. A.", "orcid": "0000-0003-2242-0244", "clpid": "Mahabal-A-A" }, { "family_name": "Odewahn", "given_name": "S. C.", "clpid": "Odewahn-S-C" }, { "family_name": "de Carvalho", "given_name": "R. R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" }, { "family_name": "Gal", "given_name": "R. R.", "clpid": "Gal-R-R" }, { "family_name": "Stolorz", "given_name": "P.", "clpid": "Stolorz-P" }, { "family_name": "Granat", "given_name": "R.", "clpid": "Granat-R" }, { "family_name": "Curkendall", "given_name": "D.", "clpid": "Curkendall-D-W" }, { "family_name": "Jacob", "given_name": "J.", "clpid": "Jacob-J" }, { "family_name": "Castro", "given_name": "S.", "clpid": "Castro-S" } ], "contributor": [ { "family_name": "Banday", "given_name": "Anthony J.", "clpid": "Banday-A-J" }, { "family_name": "Zaroubi", "given_name": "Saleem", "clpid": "Zaroubi-S" }, { "family_name": "Bartelmann", "given_name": "Matthias", "clpid": "Bartelmann-M" } ], "abstract": "We review some of the scientific opportunities and technical challenges posed by the exploration of the large digital sky surveys, in the context of a Virtual Observatory (VO). The VO paradigm will profoundly change the way observational astronomy is done. Clustering analysis techniques can be used to discover samples of rare, unusual, or even previously unknown types of astronomical objects and phenomena. Exploration of the previously poorly probed portions of the observable parameter space are especially promising. We illustrate some of the possible types of studies with examples drawn from DPOSS; much more complex and interesting applications are forthcoming. Development of the new tools needed for an efficient exploration of these vast data sets requires a synergy between astronomy and information sciences, with great potential returns for both fields.", "doi": "10.1007/10849171_37", "isbn": "978-3-540-42468-0", "publisher": "Springer", "place_of_publication": "Berlin", "publication_date": "2001", "pages": "305-322" }, { "id": "authors:7yn86-6h687", "collection": "authors", "collection_id": "7yn86-6h687", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190723-160211878", "type": "book_section", "title": "The Northern Sky Optical Cluster Survey", "book_title": "Mining the Sky", "author": [ { "family_name": "Gal", "given_name": "Roy R.", "clpid": "Gal-R-R" }, { "family_name": "de Carvalho", "given_name": "Reinaldo R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" }, { "family_name": "Odewahn", "given_name": "Stephen C.", "clpid": "Odewahn-S-C" }, { "family_name": "Djorgovski", "given_name": "S. George", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "Brunner", "given_name": "Robert J.", "clpid": "Brunner-R-J" }, { "family_name": "Margoniner", "given_name": "Vera E.", "clpid": "Margoniner-V-E" } ], "contributor": [ { "family_name": "Banday", "given_name": "Anthony J.", "clpid": "Banday-A-J" }, { "family_name": "Zaroubi", "given_name": "Saleem", "clpid": "Zaroubi-S" }, { "family_name": "Bartelmann", "given_name": "Matthias", "clpid": "Bartelmann-M" } ], "abstract": "The Northern Sky Optical Cluster Survey aims to create an objective catalog of galaxy clusters over the entire high-galactic-latitude Northern sky. We use the catalogs generated from the Digitized Second Palomar Sky Survey (DPOSS, Djorgovski et al. 1999) as the basis for this survey. We apply a color criterion to select against field galaxies, and use a simple adaptive kernel technique to create galaxy density maps, combined with the bootstrap technique to make significance maps, from which density peaks are selected. We find a mean surface density of \u223c1.5 clusters per square degree, consistent with the detection of richness class 0 and higher clusters to z\u223c0.3. In addition, we demonstrate an effective photometric redshift estimator for our clusters.", "doi": "10.1007/10849171_12", "isbn": "978-3-540-42468-0", "publisher": "Springer", "place_of_publication": "Berlin", "publication_date": "2001", "pages": "160-167" }, { "id": "authors:qvtgm-1yn04", "collection": "authors", "collection_id": "qvtgm-1yn04", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190723-155408196", "type": "book_section", "title": "Automated Search of LSB Galaxies in DPOSS (CRoNaRio Project): Method and First Results from Follow-Ups", "book_title": "Mining the Sky", "author": [ { "family_name": "Testa", "given_name": "Vincenzo", "clpid": "Testa-V" }, { "family_name": "Sabatini", "given_name": "Sabina", "clpid": "Sabatini-S" }, { "family_name": "Scaramella", "given_name": "Roberto", "clpid": "Scaramella-R" }, { "family_name": "Longo", "given_name": "Giuseppe", "orcid": "0000-0002-9182-8414", "clpid": "Longo-G" }, { "family_name": "Djorgovski", "given_name": "S. George", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "Gal", "given_name": "Roy R.", "clpid": "Gal-R-R" }, { "family_name": "Brunner", "given_name": "Robert J.", "clpid": "Brunner-R-J" }, { "family_name": "de Carvalho", "given_name": "Reinaldo R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" } ], "contributor": [ { "family_name": "Banday", "given_name": "Anthony J.", "clpid": "Banday-A-J" }, { "family_name": "Zaroubi", "given_name": "Saleem", "clpid": "Zaroubi-S" }, { "family_name": "Bartelmann", "given_name": "Matthias", "clpid": "Bartelmann-M" } ], "abstract": "We developed an algorithm to search automatically for LSB galaxies in the DPOSS plate scans. The algorithm consists of three different steps in which: i) the original image is processed with a standard image analysis package (e.g. SExtractor) and normal high surface brightness objects are removed; ii) a series of filters with an exponential compensated profile are applied at different scales; iii) significance maps are pruned by selecting, for each detection, the characteristic scale and significance; iv) candidates are then trimmed by measuring them on the original image with a fit with an exponential profile. Multicolor optical follow-up with CCD has begun on some of the best candidates.", "doi": "10.1007/10849171_72", "isbn": "978-3-540-42468-0", "publisher": "Springer", "place_of_publication": "Berlin", "publication_date": "2001", "pages": "557-563" }, { "id": "authors:a8mr1-26v46", "collection": "authors", "collection_id": "a8mr1-26v46", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190723-161537020", "type": "book_section", "title": "Cataloging of the Digitized Poss-II: Initial Scientific Results", "book_title": "New Horizons from Multi-Wavelength Sky Surveys", "author": [ { "family_name": "Djorgovski", "given_name": "S. G.", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "de Carvalho", "given_name": "R. R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" }, { "family_name": "Gal", "given_name": "R. R.", "clpid": "Gal-R-R" }, { "family_name": "Pahre", "given_name": "M. A.", "clpid": "Pahre-M-A" }, { "family_name": "Scaramella", "given_name": "R.", "clpid": "Scaramella-R" }, { "family_name": "Longo", "given_name": "G.", "orcid": "0000-0002-9182-8414", "clpid": "Longo-G" } ], "contributor": [ { "family_name": "McLean", "given_name": "Brian J.", "clpid": "McLean-B-J" } ], "abstract": "The Second Palomar Sky Survey (POSS-II) is now nearing completion. It will cover the entire northern sky with 894 fields (6.5\u00b0 square) at 5\u00b0 spacings, with no gaps in the coverage. Plates are taken in three bands: IIIa-J + GG395, \u03bb_(eff) \u223c 480 nm; IIIa-F + RG610, \u03bb_(eff) \u223c 650 nm; and IV-N + RG9, \u03bb_(eff) \u223c 850 nm. Typical limiting magnitudes reached are B_J \u223c 22.5, R_F \u223c 20.8, and I_N \u223c 19.5, i.e., \u223c 1m \u22121.5m deeper than the POSS-I. The image quality is improved relative to the POSS-I, and is comparable to the southern photographic sky surveys. For more details, see Reid et al. (1987), and Reid & Djorgovski (1993).", "doi": "10.48550/arXiv.9612108", "isbn": "9780792348023", "publisher": "Kluwer", "place_of_publication": "Dordrecht", "publication_date": "1998", "pages": "424-430" }, { "id": "authors:wsbxg-smv82", "collection": "authors", "collection_id": "wsbxg-smv82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180711-101525969", "type": "book_section", "title": "Data mining a large digital sky survey: from the challenges to the scientific results", "book_title": "Applications of Digital Image Processing XX", "author": [ { "family_name": "Djorgovski", "given_name": "S. G.", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "de Carvalho", "given_name": "R. R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" }, { "family_name": "Odewahn", "given_name": "S. C.", "clpid": "Odewahn-S-C" }, { "family_name": "Gal", "given_name": "R. R.", "clpid": "Gal-R-R" }, { "family_name": "Roden", "given_name": "J.", "clpid": "Roden-J-C" }, { "family_name": "Stolorz", "given_name": "P.", "clpid": "Stolorz-P" }, { "family_name": "Gray", "given_name": "A.", "clpid": "Gray-A" } ], "contributor": [ { "family_name": "Tescher", "given_name": "Andrew G.", "clpid": "Tescher-A-G" } ], "abstract": "The analysis and an efficient scientific exploration of the digital Palomar observatory sky survey represents a major technical challenge. The input data set consists of 3 Terabytes of pixel information, and contains a few billion sources. We describe some of the specific scientific problems posed by the data, including searches for distant quasars and clusters of galaxies, and the data-mining techniques we are exploring in addressing them Machine- assisted discovery methods may become essential for the analysis of such multi-Terabyte data sets. New and future approaches involve unsupervised classification and clustering analysis in the Giga-object data space, including various Bayesian techniques. In addition to the searches for known types of objects in this database, these techniques may also offer the possibility of discovering previously unknown, rare types of astronomical objects.", "doi": "10.1117/12.292750", "isbn": "9780819425867", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "1997-10-30", "pages": "98-109" }, { "id": "authors:mar67-trq96", "collection": "authors", "collection_id": "mar67-trq96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190724-073811293", "type": "book_section", "title": "Towards an Objectively Defined Catalog of Galaxy Clusters from the Digitized POSS-II", "book_title": "Wide-Field Spectroscopy", "author": [ { "family_name": "de Carvalho", "given_name": "R. R.", "orcid": "0000-0002-1283-3363", "clpid": "de-Carvalho-R-R" }, { "family_name": "Djorgovski", "given_name": "S. G.", "orcid": "0000-0002-0603-3087", "clpid": "Djorgovski-S-G" }, { "family_name": "Pahre", "given_name": "M.", "clpid": "Pahre-M-A" }, { "family_name": "Gal", "given_name": "R. R.", "clpid": "Gal-R-R" }, { "family_name": "Gray", "given_name": "A.", "clpid": "Gray-A" }, { "family_name": "Roden", "given_name": "J.", "clpid": "Roden-J" } ], "contributor": [ { "family_name": "Kontizas", "given_name": "E.", "clpid": "Kontizas-E" }, { "family_name": "Kontizas", "given_name": "M.", "clpid": "Kontizas-M" }, { "family_name": "Morgan", "given_name": "D. H.", "clpid": "Morgan-D-H" }, { "family_name": "Vettolani", "given_name": "G. P.", "clpid": "Vettolani-G-P" } ], "abstract": "The subjective nature of the Abell catalog has been widely recognized as its major limitation. We report on the preliminary results of an effort to create an unbiased catalog of clusters of galaxies from the galaxy catalogs derived from the digitized POSS-II (DPOSS).", "doi": "10.1007/978-94-011-5722-3_51", "isbn": "978-94-010-6413-2", "publisher": "Springer", "place_of_publication": "Dordrecht", "publication_date": "1997", "pages": "285-286" } ]