{"_buckets": {"deposit": "049c102f-98cb-4628-8149-97eb8cb09875"}, "_deposit": {"created_by": 1, "id": "550", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "550"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00000550", "sets": ["13"]}, "author_link": ["0", "0", "0"], "item_1_biblio_info_21": {"attribute_name": "書誌情報（ソート用）", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2006-09-29", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_1_creator_2": {"attribute_name": "著者名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "今井, 弘二"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_creator_3": {"attribute_name": "フリガナ", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "イマイ, コウジ"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_date_granted_11": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "2006-09-29"}]}, "item_1_degree_grantor_5": {"attribute_name": "学位授与機関", "attribute_value_mlt": [{"subitem_degreegrantor": [{"subitem_degreegrantor_name": "総合研究大学院大学"}]}]}, "item_1_degree_name_6": {"attribute_name": "学位名", "attribute_value_mlt": [{"subitem_degreename": "博士（理学）"}]}, "item_1_description_1": {"attribute_name": "ID", "attribute_value_mlt": [{"subitem_description": "2006506", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "I present J- and Ks-band galaxy counts and galaxy colors covering 750\u003cbr /\u003earcminutes\u003csup\u003e2\u003c/sup\u003e in the deep AKARI North Ecliptic Pole (NEP) field, using the\u003cbr /\u003eFLeridA Multi-object lmaglng Near-ir Grism Observational Spectrometer\u003cbr /\u003e(FLAMINGOS) on the Kitt Peak National Observatory (KPNO) 2.1 m\u003cbr /\u003etelescope. The limiting magnitudes with a slgnal-to-noise ratio of three in\u003cbr /\u003ethe deepest regions are 21.85 and 20.15 in the J- and Ks-bands respectively\u003cbr /\u003ein the Vega magnitude system.\u003cbr /\u003e\u003cbr /\u003e     The J-and Ks-band galaxy counts in the AKARINEP field are broadly in\u003cbr /\u003egood agreement with those of other results in the literature, however the\u003cbr /\u003ecounts show a characteristic change in the galaxy count slope in both the J-and\u003cbr /\u003eKs-bands. The slope of the J-band galaxy counts per square degree per\u003cbr /\u003emagnitude clearly changes at J ～ 19.5 from d(logN)/dm = 0.39 ± 0.02 to\u003cbr /\u003e0.30 ± 0.03, while　the ks-band galaxy counts shows a clear \u0027bump\u0027 in\u003cbr /\u003ethe magnitude range 18.0 \u003c Ks \u003c 19.5. The B -Ks color distribution of the\u003cbr /\u003egalaxy samples also shows an obvious change around the `bump\u0027\u003cbr /\u003emagnitude of the ks-band counts. The number of faint blue samples in the\u003cbr /\u003emagnitude range 18.5 \u003cKs \u003c 19.5 is signincantly larger than that of ks\u003c\u003cbr /\u003e17.5 samples.\u003cbr /\u003e\u003cbr /\u003e     In order to find a clue tounderstandthe ongln of the change in J- and\u003cbr /\u003eks-band count slopes and the bluer trend at fainter magnitudes below the\u003cbr /\u003ebump of Ks-band counts, I also investigated the number counts of Ks-band\u003cbr /\u003eselected high redshift galaxy populations:the extremely red objects (EROs),\u003cbr /\u003ethe B,z and K-band selected galaxies (BzKs) and the distant red galaxies\u003cbr /\u003e(DRGs). I foundthat the number counts of both the passive EROs and the\u003cbr /\u003epassive BzKs have shallower slopes at fainter magnitudes and turnovers at\u003cbr /\u003eKs ～ 18.5 and Ks ～ 19.0, respectively, while the number count of the\u003cbr /\u003estar-fomlng BzKs is a single power-law with a steeper slope. The observed\u003cbr /\u003enumber counts of these passive populations are compared with a backward\u003cbr /\u003eevolution model allowing the number density evolution. The pure\u003cbr /\u003eluminosity evolution model without density evolution fails to explain the\u003cbr /\u003eobserved counts at faint magnitudes (Ks \u003e 17.0), while the model with a\u003cbr /\u003enegative density evolution is consistent with the observed counts of the\u003cbr /\u003epassive populations.\u003cbr /\u003e\u003cbr /\u003e     Based on these results, I also investigated an evolutional scenario of\u003cbr /\u003egalaxy populations which can explainthe observed K-band count by using\u003cbr /\u003ethree components (early-type, late-type and star-forming populations),\u003cbr /\u003ebackward evolution model with type-dependent luminosity functions. I\u003cbr /\u003efound that not onlythe ellipticals but also the spiral galaxy population has\u003cbr /\u003eto follow the negative density evolution whilethe starburst population\u003cbr /\u003eshows the strong positive density evolution.\u003cbr /\u003e\u003cbr /\u003e     Finally,the on-going NEP deep surveys at 2-26 pm with AKARI will\u003cbr /\u003eprovide us with new and critical pieces of information to verify and improve\u003cbr /\u003ethe galaxy evolution scenario discussed in this thesis.", "subitem_description_type": "Other"}]}, "item_1_description_7": {"attribute_name": "学位記番号", "attribute_value_mlt": [{"subitem_description": "総研大甲第986号", "subitem_description_type": "Other"}]}, "item_1_select_14": {"attribute_name": "所蔵", "attribute_value_mlt": [{"subitem_select_item": "有"}]}, "item_1_select_8": {"attribute_name": "研究科", "attribute_value_mlt": [{"subitem_select_item": "物理科学研究科"}]}, "item_1_select_9": {"attribute_name": "専攻", "attribute_value_mlt": [{"subitem_select_item": "11 宇宙科学専攻"}]}, "item_1_text_10": {"attribute_name": "学位授与年度", "attribute_value_mlt": [{"subitem_text_value": "2006"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "IMAI, Koji", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2016-02-17"}], "displaytype": "simple", "download_preview_message": "", "file_order": 0, "filename": "甲986_要旨.pdf", "filesize": [{"value": "361.4 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_11", "mimetype": "application/pdf", "size": 361400.0, "url": {"label": "要旨・審査要旨", "url": "https://ir.soken.ac.jp/record/550/files/甲986_要旨.pdf"}, "version_id": "892b91e7-74a8-410f-82ec-2ea81a568e4e"}]}, "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": "thesis", "resourceuri": "http://purl.org/coar/resource_type/c_46ec"}]}, "item_title": "A NEAR INFRARED SURVEY IN THE AKARI NORTH ECLIPTIC POLE FIELD", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "A NEAR INFRARED SURVEY IN THE AKARI NORTH ECLIPTIC POLE FIELD"}, {"subitem_title": "A NEAR INFRARED SURVEY IN THE AKARI NORTH ECLIPTIC POLE FIELD", "subitem_title_language": "en"}]}, "item_type_id": "1", "owner": "1", "path": ["13"], "permalink_uri": "https://ir.soken.ac.jp/records/550", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-02-22"}, "publish_date": "2010-02-22", "publish_status": "0", "recid": "550", "relation": {}, "relation_version_is_last": true, "title": ["A NEAR INFRARED SURVEY IN THE AKARI NORTH ECLIPTIC POLE FIELD"], "weko_shared_id": -1}