{"id":132261,"date":"2020-06-21T12:27:00","date_gmt":"2020-06-21T10:27:00","guid":{"rendered":"https:\/\/osr.org\/?p=132261"},"modified":"2024-05-24T19:23:01","modified_gmt":"2024-05-24T17:23:01","slug":"bilinen-en-genc-atarca-yildiz-kesfedildi","status":"publish","type":"post","link":"https:\/\/osr.org\/tr\/blog\/astronomi\/bilinen-en-genc-atarca-yildiz-kesfedildi\/","title":{"rendered":"Bilinen en gen\u00e7 ‘atarca’ y\u0131ld\u0131z ke\u015ffedildi"},"content":{"rendered":"

“Swift J1818.0\u22121607” ismi verilen atarca y\u0131ld\u0131z\u0131n, 240 ya\u015f\u0131nda hesap edildi\u011fi ve kozmik standartlarda “ger\u00e7ek bir yenido\u011fan” oldu\u011fu belirtildi.<\/p>\n

N\u00f6tron y\u0131ld\u0131z s\u0131n\u0131f\u0131na giren atarca y\u0131ld\u0131z\u0131n, ilk kez muazzam X \u0131\u015f\u0131\u011f\u0131 patlamas\u0131n\u0131n meydana geldi\u011fi 12 Mart’ta NASA’n\u0131n Neil Gehrels Swift G\u00f6zlemevince fark edildi\u011fi kaydedildi.<\/p>\n

Bunun sonras\u0131nda ESA’n\u0131n XMM-Newton G\u00f6zlemevi ve NASA’n\u0131n NuSTAR teleskobuyla takibe al\u0131nan “kozmik bebe\u011fin” fiziksel \u00f6zellikleri saptand\u0131.<\/p>\n

N\u00f6tron y\u0131ld\u0131z\u0131n, dev bir y\u0131ld\u0131z\u0131n t\u00fckenerek patlamas\u0131ndan sonra arta kalan son derece yo\u011fun k\u00fctleli madde oldu\u011fu ifade ediliyor.<\/p>\n

Evrende kara delikten sonra en yo\u011fun nesneler aras\u0131nda g\u00f6sterilen n\u00f6tron y\u0131ld\u0131z\u0131n\u0131n bir \u00e7ay ka\u015f\u0131\u011f\u0131na e\u015fde\u011fer par\u00e7as\u0131n\u0131n, D\u00fcnya’da 4 milyar ton a\u011f\u0131rl\u0131\u011f\u0131nda gelece\u011fi belirtiliyor.<\/p>\n

“Kalp gibi atan” anlam\u0131na gelen “pulsar” ya da atarca y\u0131ld\u0131zlar, kalp at\u0131\u015flar\u0131 gibi muntazam aral\u0131klarla uzaya radyo dalgalar\u0131 g\u00f6nderen n\u00f6tron y\u0131ld\u0131zlar\u0131 olarak biliniyor.<\/p>\n

Pulsar ya da atarca y\u0131ld\u0131z ne demek?<\/span><\/h2>\n

Pulsar ya da atarca, “kalp gibi atan” anlam\u0131na gelmektedir. \u0130ngilizcede “kalbin atmas\u0131” anlam\u0131na gelen “pulsate” kelimesinden t\u00fcretilmi\u015ftir. Pulsarlar, i\u00e7inde bulunduklar\u0131 nebulalar\u0131n \u00e7ekirde\u011fi ve kalbi h\u00fckm\u00fcnde olduklar\u0131 kadar, kalp at\u0131\u015flar\u0131 gibi muntazam fas\u0131llarla (ritimlerle) uzaya radyo dalgalar\u0131 g\u00f6nderen n\u00f6tron y\u0131ld\u0131zlar\u0131d\u0131r.<\/p>\n

Yenge\u00e7 Bulutsususunun optik ve X-\u0131\u015f\u0131n\u0131 g\u00f6r\u00fcnt\u00fclerinin birle\u015ftirilmesiyle olu\u015fturulmu\u015f foto\u011fraf. Nebula merkezindeki atarcan\u0131n olu\u015fturdu\u011fu manyetik alan \u00e7izgileri g\u00f6zlemlenebilir.
\nBir n\u00f6tron y\u0131ld\u0131z\u0131, s\u00fcpernova patlamas\u0131 sonucu par\u00e7alanan bir y\u0131ld\u0131z\u0131n merkezinin kendi \u00fczerine \u00e7\u00f6kmesiyle olu\u015fur. N\u00f6tron y\u0131ld\u0131zlar\u0131 \u00e7ok yo\u011fun k\u00fctleli, \u00e7ok k\u00fc\u00e7\u00fck \u00e7apl\u0131, y\u00fcksek manyetik alana sahip ve kendi \u00e7evresinde muazzam h\u0131zlarda d\u00f6nen g\u00f6k cisimleridir. G\u00fcne\u015fimiz gibi y\u0131ld\u0131zlar hi\u00e7bir zaman bir n\u00f6tron y\u0131ld\u0131z\u0131 olu\u015fturamaz. Bu tip y\u0131ld\u0131zlar yak\u0131tlar\u0131 t\u00fckendikten sonra beyaz c\u00fccelere d\u00f6n\u00fc\u015fmektedirler. Sadece b\u00fcy\u00fck k\u00fctleli y\u0131ld\u0131zlar (G\u00fcne\u015fimizden en az 8 kat daha fazla k\u00fctleye sahip y\u0131ld\u0131zlar) supernova patlamas\u0131 sonucu kendi \u00fcst\u00fcne \u00e7\u00f6kerek n\u00f6tron y\u0131ld\u0131z\u0131 olu\u015fturabilir. G\u00fcne\u015fimizden en az 25 kat daha b\u00fcy\u00fck k\u00fctleli y\u0131ld\u0131zlarsa ayn\u0131 zincirleme olaylar\u0131 ya\u015fad\u0131ktan sonra kara delik olu\u015fturabilirler.<\/p>\n

N\u00f6tron y\u0131ld\u0131z\u0131 teorisinin ortaya at\u0131ld\u0131\u011f\u0131 1934 y\u0131l\u0131ndan atarcalar\u0131n ke\u015ffedildi\u011fi 1967 y\u0131l\u0131na kadar bu g\u00f6k cisimlerinin optik olarak d\u00fcnyadan g\u00f6zlemlenebilece\u011fi d\u00fc\u015f\u00fcn\u00fclm\u00fcyordu. Kendi etraf\u0131nda y\u00fcksek h\u0131zlarla d\u00f6nen n\u00f6tron y\u0131ld\u0131z\u0131 kutuplar\u0131ndan uzaya do\u011fru \u00e7ok y\u00fcksek h\u0131zlarda par\u00e7ac\u0131k sa\u00e7ar. Bu \u015fekilde belli aral\u0131klarla elektromanyetik \u0131\u015f\u0131ma yapan n\u00f6tron y\u0131ld\u0131zlar\u0131na pulsar ad\u0131 verilir. Manyetik kutuplardan \u00e7\u0131kan bu \u0131\u015f\u0131n\u0131m (darbe) g\u00f6r\u00fc\u015f \u00e7izgimizi kesti\u011fi s\u00fcrece pulsar d\u00fcnyadan g\u00f6zlemlenebilir. Yani \u0131\u015f\u0131n\u0131m s\u00fcreklidir ancak bu \u0131\u015f\u0131n\u0131m d\u00fcnyadan kesik kesik izlenebildi\u011fi i\u00e7in cisim bize periyodik elektromanyateik \u0131\u015f\u0131n\u0131mlar yapan bir kaynak gibi g\u00f6z\u00fck\u00fcr.Buna deniz feneri etkisi denmektedir. Ne var ki her n\u00f6tron y\u0131ld\u0131z\u0131 pulsar olamayabilece\u011fi gibi her pulsarda d\u00fcnyadan g\u00f6zlemlenemez.<\/p>\n

\u0130lk g\u00f6zlemlenen pulsar, Tilkicik tak\u0131my\u0131ld\u0131z\u0131n\u0131n ortas\u0131nda bulunmakta ve her 1,3 saniyede nab\u0131z at\u0131\u015flar\u0131 gibi radyo dalgalar\u0131 yaymaktayd\u0131.<\/p>\n

Baz\u0131 pulsarlar, radyo dalgalar\u0131ndan ba\u015fka \u0131\u015f\u0131k, k\u0131z\u0131l\u00f6tesi ve mor\u00f6tesi \u0131\u015f\u0131nlar da yaymaktad\u0131rlar. Pulsar\u0131n kendi etraf\u0131ndaki d\u00f6n\u00fc\u015f h\u0131z\u0131 olduk\u00e7a y\u00fcksektir. Baz\u0131lar\u0131 kendi etraf\u0131nda saniyede 1000 (bin) devir yapar. 20 km \u00e7ap\u0131ndaki bir pulsar\u0131n ekvator y\u00fczeyinde bu d\u00f6n\u00fc\u015f h\u0131z\u0131 saniyede 62.800, dakikada 3.768.00, saatte ise 226.000.000 kilometreyi bulmaktad\u0131r.<\/p>\n

Pulsarlar o kadar yo\u011fundurlar ki bir \u00e7ay ka\u015f\u0131\u011f\u0131 kadar atarca maddesinin d\u00fcnyadaki a\u011f\u0131rl\u0131\u011f\u0131 100 milyon tonu ge\u00e7mektedir.<\/p>\n","protected":false},"excerpt":{"rendered":"

“Swift J1818.0\u22121607” ismi verilen atarca y\u0131ld\u0131z\u0131n, 240 ya\u015f\u0131nda hesap edildi\u011fi ve kozmik standartlarda “ger\u00e7ek bir yenido\u011fan” oldu\u011fu belirtildi. N\u00f6tron y\u0131ld\u0131z s\u0131n\u0131f\u0131na giren atarca y\u0131ld\u0131z\u0131n, ilk kez muazzam X \u0131\u015f\u0131\u011f\u0131 patlamas\u0131n\u0131n meydana geldi\u011fi 12 Mart’ta NASA’n\u0131n Neil Gehrels Swift G\u00f6zlemevince fark edildi\u011fi kaydedildi. Bunun sonras\u0131nda ESA’n\u0131n XMM-Newton G\u00f6zlemevi ve NASA’n\u0131n NuSTAR teleskobuyla takibe al\u0131nan “kozmik bebe\u011fin” […]<\/p>\n","protected":false},"author":23,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[506],"tags":[],"class_list":["post-132261","post","type-post","status-publish","format-standard","hentry","category-astronomi"],"acf":[],"yoast_head":"\nBilinen en gen\u00e7 'atarca' y\u0131ld\u0131z ke\u015ffedildi - Online Star Register<\/title>\n<meta name=\"description\" content=\"En gen\u00e7 pulsar ke\u015ffedildi... Y\u0131ld\u0131zlar d\u00fcnyas\u0131 parl\u0131yor\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/osr.org\/tr\/blog\/astronomi\/bilinen-en-genc-atarca-yildiz-kesfedildi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bilinen en gen\u00e7 'atarca' y\u0131ld\u0131z ke\u015ffedildi - Online Star Register\" \/>\n<meta property=\"og:description\" content=\"En gen\u00e7 pulsar ke\u015ffedildi... 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