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"creators": { "items": [ { "id": "Abell-George-Ogden", "name": { "family": "Abell", "given": "George Ogden" }, "show_email": "NO" } ] }, "title": "The Distribution of Rich Clusters of Galaxies", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Astronomy and Physics)", "abstract": "
A catalogue is prepared of 2712 rich clusters of galaxies found on the National Geographic Society--Palomar Observatory Sky Survey. From the catalogue, 1682 clusters are selected which meet specific criteria for inclusion in a homogeneous statistical sample.
\r\n\r\nAn investigation of the sample leads to the following conclusions: (i) The distribution function of clusters according to richness, N(n) increases rapidly as n decreases. (ii) The data allow no significant decision that the spatial density of cluster centers varies with distance. (iii) Galactic obscuration of the order of a few tenths of a magnitude (photored) exists at high northern galactic latitudes around galactic longitude 300\u00b0. (iv) There is a highly significant nonrandom distribution of clusters in direction, both when clusters at all distances and when clusters at various distances are considered. An analysis of the distribution yields strong evidence for the existence of second-order clusters, that is clusters of clusters of galaxies. A statistical test shows the observed distribution to be compatible with the assumption of complete second-order clustering of galaxies.
", "date": "1957", "date_type": "degree", "id_number": "CaltechETD:etd-05022007-092134", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-05022007-092134", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Melissa Ray", "local_group": { "items": [ "Astronomy Department" ] }, "deposited_by": "Imported from ETD-db", "deposited_on": "2007-05-03", "doi": "10.7907/99X5-ZM38", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Osterbrock-D-E", "name": { "family": "Osterbrock", "given": "Donald E." }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2007-05-02", "thesis_defense_date": "1957-01-01", "thesis_approved_date": "2007-05-03", "review_status": "approved", "option_major": { "items": [ "astronomy" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1957", "author_list": "Abell, George Ogden", "advisor_list": "Osterbrock, Donald E.", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/2493", "eprint_id": 2493, "rev_number": 10, "documents": [ { "id": "/id/document/4748", "doc_id": 4748, "rev_number": 2, "files": [ { "id": "/id/file/27368", "fileid": 27368, "datasetid": "document", "objectid": 4748, "filename": "Mathis_js_1956.pdf", "mime_type": "application/pdf", "filesize": 6165164, "mtime": "2012-12-26 02:52:07", "url": "/2493/1/Mathis_js_1956.pdf" } ], "eprint_id": 2493, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Mathis_js_1956.pdf", "language": "en", "security": "public", "license": "other", "main": "Mathis_js_1956.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/21303" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/21303" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/21303" } ] } }, { "id": "/id/document/21303", "doc_id": 21303, "rev_number": 2, "files": [ { "id": "/id/file/27366", "fileid": 27366, "datasetid": "document", "objectid": 21303, "filename": "preview.png", "mime_type": "image/png", "hash": "acb71e677f0f80e146d8e10b0ff45195", "hash_type": "MD5", "filesize": 8478, "mtime": "2012-12-26 02:52:07", "url": "/2493/2/preview.png" } ], "eprint_id": 2493, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/4748" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/4748" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/4748" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/24/93", "datestamp": "2004-06-08", "lastmod": "2023-07-13 22:47:59", "status_changed": "2009-09-25 02:39:10", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mathis-John-Samuel", "name": { "family": "Mathis", "given": "John Samuel" }, "show_email": "NO" } ] }, "title": "The Abundance of Helium Relative to Hydrogen in the Orion Nebula", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Astronomy and Physics)", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nSpectrograms were taken at two slit positions in the brighest portion of the Orion Nebula near the exciting star [...] Ori C. Four independent measurements were made in each slit position of the ratios of the He I lines [...], and [...] to the hydrogen lines H , H , and H , respectively. The ratios of the [OIII] lines [...] and [...] and of the [OII] lines [...] and [...] were also determined. Reddening by interstellar absorption was taken into account.\r\n\r\nThe electron density was found from the [OII] lines to be 3,800 [...]. The electron temperature was found from the [OIII] lines to be 10,000[degrees]K. The theory of statistical equilibrium was developed for neutral helium, and from the three helium lines the ratio of abundances of helium and hydrogen was found to be 0.128 by number. All three lines gave results within nineteen per cent of the average in both slit positions.\r\n\r\nIt was found that the absorption of the line of He I at [...] in the spectrum of [...] Ori, C could take place in only .025 parsec under the most favorable conditions.\r\n\r\nIn order to estimate the lifetime of the [...] level in helium the probability of two-photon emission was estimated. The estimate was [...].", "date": "1956", "date_type": "degree", "id_number": "CaltechETD:etd-06072004-163340", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-06072004-163340", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "local_group": { "items": [ "Astronomy Department" ] }, "deposited_by": "Imported from ETD-db", "deposited_on": "2004-06-08", "doi": "10.7907/CB4D-4026", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Osterbrock-D-E", "name": { "family": "Osterbrock", "given": "Donald E." }, "role": "advisor" }, { "id": "M\u00fcnch-G", "name": { "family": "M\u00fcnch", "given": "Guido" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2004-06-07", "thesis_defense_date": "1956-01-01", "thesis_approved_date": "2004-06-08", "review_status": "approved", "option_major": { "items": [ "astronomy" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1956", "author_list": "Mathis, John Samuel", "advisor_list": "Osterbrock, Donald E. and M\u00fcnch, Guido", "comittee_list": "Unknown, Unknown" } ]