\u3010\u65e5\u6642\u30115\u670814\u65e5(\u6c34)\u300010:30-12:00
\n\u3010\u30bf\u30a4\u30c8\u30eb\u3011Variability of Blazar \u201dNRAO512\u201d
\n\u3010\u767a\u8868\u8005(\u656c\u79f0\u7565)\u3011\u8cb4\u5cf6\u653f\u89aa\uff08\u7dcf\u7814\u5927 D3\u30fb\u6c34\u6ca2\u3001\u6307\u5c0e\u6559\u54e1 \u5ddd\u53e3\u5247\u5e78)
\nBlazars are very compact and highly variable sources.
\nAccording to unification scheme, they have a relativistic jet that is pointing in the general direction of the Earth.
\nThey were divided into two sub-classes \u201dBL Lacetae Objects (hereafter\u201dBLO\u201d)\u201d
\nand \u201dFlat-Spectrum Radio Quasar (hereafter \u201dFSRQ\u201d)\u201d.
\nThe primary difference is that BLO has no(or weak) emission line, FSRQ has strong emission line. Many authors have attempted
\nto explain their differences in terms of evolution(FSRQ into BLO) or beaming effect or others. Discussion have been continued over 15-20yr, and haven\u2019t completed yet.
\nAuthors have reported many studies on flux variability of AGN , however their periodicities have been still unclear. Only OJ287 shows
\nthe clear evidence of 12 yr periodicity. The origin of variability have been investigated using VLBI. According to recent publications,
\nthere are two kinds of flare which has freq-lag \u201dcore-flare\u201d and no freq-lag \u201djet-flare\u201d.
\nPyatunina et al.(2000,2007) defined the activity cycle as the time interval between two successive \u201dcore (optically thick) flare\u201d. Between 2000 and 2007, they found periodicities of flux variations for 6 sources, and investigated the origin of variation using VLBI mapping technique.
\nI found that the Blazar \u201dNRAO512\u201d flared in 2007\/06 using Japanese eVLBI-array \u201dOCTAVE\u201d. Above-menthioned, periodicity of flare
\nis important. I analyzed over 100 epoch archives of VLBI. I found the periodicity of flux variation for Blazar \u201dNRAO512\u201d. The periodicity is 9-10 yr.
\nThis result is important to support existence of periodicity.
\nBecause \u201dNRAO512\u201d is very compact source, many authors could not determine the orientation of jet and their structure
\nusing VLBI with 2 milli-arcsecond resolution. I analyzed more higher resolution (less than 1 mas) datum, and first determined the orientation and proper motion of jet knot.
\nFinally, I introduce a new hypothesis that the period of variability may be a good tool to investigate difference between BLO and FSRQ.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3010\u65e5\u6642\u30115\u670814\u65e5(\u6c34)\u300010:30-12:00 \u3010\u30bf\u30a4\u30c8\u30eb\u3011Variability of Blazar \u201dNRAO512\u201d \u3010\u767a\u8868\u8005(\u656c\u79f0\u7565)\u3011\u8cb4\u5cf6\u653f\u89aa\uff08\u7dcf\u7814\u5927 D3\u30fb\u6c34\u6ca2\u3001\u6307\u5c0e\u6559\u54e1 \u5ddd\u53e3\u5247\u5e78) Blazars are […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,5],"tags":[],"class_list":["post-13","post","type-post","status-publish","format-standard","hentry","category-6","category-5"],"_links":{"self":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13"}],"version-history":[{"count":0,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/13\/revisions"}],"wp:attachment":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}