{"created":"2023-06-20T14:38:40.406437+00:00","id":5261,"links":{},"metadata":{"_buckets":{"deposit":"6e9f2674-c19c-414c-b0f6-d4dd5a2d3627"},"_deposit":{"created_by":1,"id":"5261","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"5261"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00005261","sets":["1887:1891","9:789:956:959"]},"author_link":["25391","25392"],"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2009-02-27","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"107","bibliographicPageStart":"102","bibliographicVolumeNumber":"JAXA-SP-08-014E","bibliographic_titles":[{"bibliographic_title":"宇宙航空研究開発機構特別資料"},{"bibliographic_title":"JAXA Special Publication: Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop","bibliographic_titleLang":"en"}]}]},"item_5_description_15":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）（英）","attribute_value_mlt":[{"subitem_description":"Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop (RIKEN, 10-12 June 2008)","subitem_description_type":"Other"}]},"item_5_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"We have carried out detailed investigations of the long term X-ray flux variations of the high mass X-ray binary pulsar Cen X-3 using archival X-ray data from the Rossi X-ray timing Explorer (RXTE). In the lightcurves of several observations made with the Proportional Counter Array (PCA) and covering a wide range of X-ray intensity, we have detected Quasi Periodic Oscillation (QPO). We have observed a clustering of the QPO peak frequency at 40 and 90 mHz with no dependence of the QPO frequency and occurrence of QPOs on the X-ray intensity. If the observed X-ray intensity of Cen X-3 and its long term variations are related to the mass accretion rate, the lack of QPO frequency variation of Cen X-3 is in contrast with an inner disk origin of the QPOs. Using the same RXTE-PCA observations, we have also measured the pulsed flux of Cen X-3 in different flux states. We found that below a certain flux level, the X-ray lightcurve does not have any pulsations while above this level, the pulsed flux increases linearly with the peak flux. This is consistent with the X-ray emission of Cen X-3 having one unpulsed component and one varying component with a constant pulsed fraction. In the low state, the unpulsed component becomes dominant. The detected X-ray emission in the low state can be due to scattering of X-rays from the stellar wind of the companion star. We have also studied the orbital modulation of the Cen X-3 X-ray lightcurve using the long term X-ray lightcurve made with the All Sky Monitor on board the RXTE. We found an evolution of the orbital modulation of the X-ray lightcurve as a function of the flux state. In high state, the transitions are sharp indicating that most of the observed X-rays are produced in a small region. In the low state, the orbital modulation is smooth, indicating that most of the observed X-rays are produced in an extended region, probably by scattering of X-rays from a hidden central source. The QPO measurements, the pulsed flux measurements and the orbital modulation measurements indicate that the different flux states of Cen X-3 are produced by different degree of absorption. We propose that the absorption is caused by a periodically precessing accretion disk.","subitem_description_type":"Other"}]},"item_5_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0064306022","subitem_description_type":"Other"}]},"item_5_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: JAXA-SP-08-014E","subitem_description_type":"Other"}]},"item_5_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構"}]},"item_5_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Japan Aerospace Exploration Agency (JAXA)"}]},"item_5_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1349-113X","subitem_source_identifier_type":"ISSN"}]},"item_5_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA11984031","subitem_source_identifier_type":"NCID"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Raman Research Institute"},{"subitem_text_language":"en","subitem_text_value":"Raman Research Institute"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Paul, Biswajit","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Raichur, H.","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-01-16"}],"displaytype":"detail","filename":"64306022.pdf","filesize":[{"value":"613.1 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"64306022.pdf","url":"https://jaxa.repo.nii.ac.jp/record/5261/files/64306022.pdf"},"version_id":"cae10790-e689-40b7-9e7a-59be80dd7d6c"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Stars : neutron - (Stars :) pulsars : individual : Cen X-3 - X-rays : stars - (Stars :) Binaries : general - X-rays : individual : Cen X-3 - X-rays : binaries","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"Long term X-ray intensity variations of Cen X-3","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Long term X-ray intensity variations of Cen X-3","subitem_title_language":"en"}]},"item_type_id":"5","owner":"1","path":["959","1891"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"5261","relation_version_is_last":true,"title":["Long term X-ray intensity variations of Cen X-3"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T08:19:32.013071+00:00"}