{"id":27756,"date":"2018-07-19T06:00:09","date_gmt":"2018-07-19T03:00:09","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=27756"},"modified":"2018-07-18T19:51:12","modified_gmt":"2018-07-18T16:51:12","slug":"karadul-adli-milisaniye-pulsarinda-mod-degisiklikleri-ve-devasa-atimlar-saptandi","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/07\/19\/karadul-adli-milisaniye-pulsarinda-mod-degisiklikleri-ve-devasa-atimlar-saptandi","title":{"rendered":"&#8216;Karadul&#8217; adl\u0131 milisaniye pulsar\u0131nda mod de\u011fi\u015fiklikleri ve devasa at\u0131mlar saptand\u0131"},"content":{"rendered":"<p>Kanadal\u0131 astronomlar, PSR B1957+20, di\u011fer bir ad\u0131yla \u201cKaradul Pulsar\u0131\u201d olarak bilinen milisaniye pulsar\u0131nda (milisaniye pulsarlar\u0131, \u00e7ok h\u0131zl\u0131 d\u00f6nen n\u00f6tron y\u0131ld\u0131zlar\u0131d\u0131r) devasa at\u0131mlar ve mod de\u011fi\u015fimleri tespit etti. Ayr\u0131ca, bir milisaniye pulsar\u0131nda ilk kez bir mod (sal\u0131n\u0131m) de\u011fi\u015fim mekanizmas\u0131 g\u00f6zlemlenmi\u015f oldu.<\/p>\n<figure id=\"attachment_27758\" aria-describedby=\"caption-attachment-27758\" style=\"width: 200px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-27758\" src=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notron.gif\" alt=\"\" width=\"200\" height=\"200\" \/><figcaption id=\"caption-attachment-27758\" class=\"wp-caption-text\">D\u00f6nmenin olmad\u0131\u011f\u0131 yerdeki bir g\u00f6zlemci a\u00e7\u0131s\u0131ndan d\u00f6nen bir n\u00f6tron y\u0131ld\u0131z\u0131ndaki r-modu. \u00a9 B. J. Owen<\/figcaption><\/figure>\n<p>Radyo pulsarlar\u0131, dev at\u0131mlar gibi olan \u00e7ok k\u0131sa s\u00fcreli patlamalardan, emisyon profillerindeki uzun d\u00f6nemli de\u011fi\u015fimlerine kadar, de\u011fi\u015fen emisyon aral\u0131klar\u0131n\u0131 anlamam\u0131z i\u00e7in e\u015fsiz cisimlerdir. Baz\u0131lar\u0131 emisyon profillerinin iki ya da daha fazla emisyonun yar\u0131 kararl\u0131 modlar\u0131 ile de\u011fi\u015fti\u011fi noktada bile mod de\u011fi\u015fimi g\u00f6sterebilmekte. Bug\u00fcne dek bu tarz mod de\u011fi\u015fimlerini yaln\u0131zca normal pulsarlarda g\u00f6rebilmekteydik.<\/p>\n<p>Ancak, Kanada\u2019daki Toronto \u00dcniversitesi\u2019nden Nikhil Mahajan\u2019\u0131n liderli\u011findeki astronomlardan olu\u015fan ekibin y\u00fcr\u00fctt\u00fc\u011f\u00fc \u00e7al\u0131\u015fma, t\u0131pk\u0131 PSR B1957+20 pulsar\u0131n\u0131n at\u0131m periyodunda g\u00f6zlemledikleri iki mod aras\u0131ndaki de\u011fi\u015fim gibi, mod de\u011fi\u015fim s\u00fcre\u00e7lerinin milisaniye pulsarlar\u0131 taraf\u0131ndan da sergilenebilece\u011fini g\u00f6sterdi.<\/p>\n<p>1988 y\u0131l\u0131nda ke\u015ffedilen \u201cKaradul Pulsar\u0131\u201d, Sagitta (Ok\u00e7uk)<\/p>\n<figure id=\"attachment_27759\" aria-describedby=\"caption-attachment-27759\" style=\"width: 300px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-27759\" src=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb.jpg 300w, https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb-80x60.jpg 80w, https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb-100x75.jpg 100w, https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb-180x135.jpg 180w, https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notronb-238x178.jpg 238w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-27759\" class=\"wp-caption-text\">D\u00fcnya&#8217;n\u0131n manyetik alan\u0131 ve G\u00fcne\u015f r\u00fczgarlar\u0131 ile gelen manyetize olmu\u015f plazman\u0131n etkile\u015fimi sonucu olu\u015fmu\u015f bir yay \u015foku tasviri. Ortadaki soluk, mavi nokta D\u00fcnya&#8217;y\u0131 temsil etmektedir. \u00a9 ESA.<\/figcaption><\/figure>\n<p>tak\u0131my\u0131ld\u0131z\u0131nda yer alan, 1,6 milisaniyelik periyoda sahip, \u00f6rten (tutulan) \u00e7ift y\u0131ld\u0131z sisteminde bulunan bir milisaniye pulsar\u0131d\u0131r. Yolda\u015f y\u0131ld\u0131z\u0131, 9,2 saatlik periyodu olan bir kahverengi c\u00fccedir ve tutulma sistemde yakla\u015f\u0131k olarak yirmi dakika s\u00fcrer. Mahajan\u2019\u0131n ekibi bu pulsar\u0131 13-16 Haziran 2014 y\u0131l\u0131nda, g\u00fcnde dokuz saatin \u00fcst\u00fcnde d\u00f6rt oturumda Porto Riko\u2019da bulunan Arecibo G\u00f6zlemevi\u2019nde g\u00f6zlemledi. Bu g\u00f6zlemler, pulsar\u0131n davran\u0131\u015f\u0131 ile ilgili yeni bilgileri ortaya \u00e7\u0131karm\u0131\u015f oldu.<\/p>\n<p>Ekip yay\u0131nlad\u0131klar\u0131 makalede: &#8220;\u00c7al\u0131\u015fmada, milisaniye pulsar\u0131 PSR B1957+20&#8217;nin modunun de\u011fi\u015fti\u011fini ve daha \u00f6nceki \u00e7al\u0131\u015fmalar\u0131m\u0131zda belirtti\u011fimiz dev at\u0131mlar\u0131n \u00f6zelliklerinin modlar ile bir uyum i\u00e7inde oldu\u011funu g\u00f6steriyoruz&#8221; diyor.<\/p>\n<p>\u00c7al\u0131\u015fmaya g\u00f6re, PSR B1957+20 iki farkl\u0131 mod aras\u0131nda 1,7 saniyelik mod de\u011fi\u015fimleri veya yakla\u015f\u0131k olarak 1,000 at\u0131m periyodu ile de\u011fi\u015fim g\u00f6steriyor. Bu, astronomlar taraf\u0131ndan bug\u00fcne kadar g\u00f6zlemlenen mod de\u011fi\u015fimi en k\u0131sa olan puslar. S\u0131radan pulsarlarda bu zaman aral\u0131\u011f\u0131 dakikalardan haftalara kadar de\u011fi\u015fmektedir.<\/p>\n<p>PSR B1957+20&#8217;de g\u00f6zlemlenen iki mod, hem \u015fiddet hem de dairesel polarizasyonda de\u011fi\u015fiklik g\u00f6stermekte. Bu y\u00fczden bu de\u011fi\u015fimler, &#8220;y\u00fcksek&#8221; (daha enerjik) ve &#8220;d\u00fc\u015f\u00fck&#8221; (daha az enerjik) olarak iki grupta incelendi. Ara\u015ft\u0131rmac\u0131lar, pulsar\u0131n zaman\u0131n\u0131n yakla\u015f\u0131k y\u00fczde altm\u0131\u015f\u0131n\u0131n y\u00fcksek, y\u00fczde otuz be\u015finin ise d\u00fc\u015f\u00fck modda oldu\u011funu fark etti. Zaman\u0131n\u0131n kalan y\u00fczde be\u015fini ise iki mod aras\u0131nda ge\u00e7i\u015fe ay\u0131rmaktayd\u0131.<\/p>\n<p>Ayr\u0131ca, Arecibo G\u00f6zlemevi&#8217;nde yap\u0131lan g\u00f6zlemler, astronomlar\u0131n PSR B1957+20&#8217;de 1715 tane dev at\u0131m tespit etmesini sa\u011flad\u0131. B\u00f6ylece, at\u0131m evresi ile dev at\u0131mlar\u0131n da\u011f\u0131l\u0131m\u0131n\u0131n, mod de\u011fi\u015ftirme ile bir ili\u015fkisi oldu\u011funu g\u00f6sterdiler.<\/p>\n<p>Bununla birlikte, \u00e7al\u0131\u015fman\u0131n yazarlar\u0131, PSR B1957+20&#8217;nin bu mod de\u011fi\u015fimlerine ve dev at\u0131mlara neyin sebep oldu\u011funu tam olarak anlayabilmek i\u00e7in farkl\u0131 frekanslarda ek g\u00f6zlemler yap\u0131lmas\u0131n\u0131n gerekli oldu\u011funu belirtiyorlar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kanadal\u0131 astronomlar, PSR B1957+20, di\u011fer bir ad\u0131yla \u201cKaradul Pulsar\u0131\u201d olarak bilinen milisaniye pulsar\u0131nda (milisaniye pulsarlar\u0131, \u00e7ok h\u0131zl\u0131 d\u00f6nen n\u00f6tron y\u0131ld\u0131zlar\u0131d\u0131r) devasa at\u0131mlar ve mod de\u011fi\u015fimleri tespit etti. Ayr\u0131ca, bir milisaniye pulsar\u0131nda ilk kez bir mod (sal\u0131n\u0131m) de\u011fi\u015fim mekanizmas\u0131 g\u00f6zlemlenmi\u015f oldu. Radyo pulsarlar\u0131, dev at\u0131mlar gibi olan \u00e7ok k\u0131sa s\u00fcreli patlamalardan, emisyon profillerindeki uzun d\u00f6nemli de\u011fi\u015fimlerine [&hellip;]<\/p>\n","protected":false},"author":812,"featured_media":27757,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19,26,3256],"tags":[3710,3315,3312,3709,2238,3711,3712,3714,1883,3713],"class_list":["post-27756","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","category-fizik","category-uzay-ve-havacilik","tag-cift-yildiz-sistemleri","tag-cift-yildizlar","tag-kahverengi-cuce","tag-milisaniye-pulsari","tag-notron-yildizi","tag-notron-yildizi-modu","tag-orten-cift-sistemler","tag-orten-cift-yildizlar","tag-pulsar","tag-tutulmali-cift-yildizlar"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Ece G\u00fclfem Da\u011fdeviren\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/07\/19\/karadul-adli-milisaniye-pulsarinda-mod-degisiklikleri-ve-devasa-atimlar-saptandi\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.8\" \/>\n\t\t<meta property=\"og:locale\" content=\"tr_TR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Bilim ve Gelecek\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\u2018Karadul\u2019 adl\u0131 milisaniye pulsar\u0131nda mod de\u011fi\u015fiklikleri ve devasa at\u0131mlar saptand\u0131 | Bilim ve Gelecek\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/07\/19\/karadul-adli-milisaniye-pulsarinda-mod-degisiklikleri-ve-devasa-atimlar-saptandi\" \/>\n\t\t<meta property=\"fb:app_id\" content=\"2104805563100892\" \/>\n\t\t<meta property=\"fb:admins\" content=\"1250955469\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notron4.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notron4.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2018-07-19T03:00:09+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2018-07-18T16:51:12+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bilimvegelecekdergisi\/\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:site\" content=\"@bilimvegelecek\" \/>\n\t\t<meta name=\"twitter:title\" content=\"\u2018Karadul\u2019 adl\u0131 milisaniye pulsar\u0131nda mod de\u011fi\u015fiklikleri ve devasa at\u0131mlar saptand\u0131 | Bilim ve Gelecek\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/07\/notron4.jpg\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/2018\\\/07\\\/19\\\/karadul-adli-milisaniye-pulsarinda-mod-degisiklikleri-ve-devasa-atimlar-saptandi#article\",\"name\":\"\\u2018Karadul\\u2019 adl\\u0131 milisaniye pulsar\\u0131nda mod de\\u011fi\\u015fiklikleri ve devasa at\\u0131mlar saptand\\u0131 | Bilim ve Gelecek\",\"headline\":\"&#8216;Karadul&#8217; adl\\u0131 milisaniye pulsar\\u0131nda mod de\\u011fi\\u015fiklikleri ve devasa at\\u0131mlar saptand\\u0131\",\"author\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/author\\\/egdagdeviren#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/#organization\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/wp-content\\\/uploads\\\/2018\\\/07\\\/notron4.jpg\",\"width\":800,\"height\":450,\"caption\":\"PSR B1957+20\\u2019\\u0131n Chandra uydusu ile elde edilmi\\u015f g\\u00f6r\\u00fcnt\\u00fcs\\u00fc. 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