Samanyolu\u2019nun yakla\u015f\u0131k 13,6 milyar y\u0131ll\u0131k tarihi boyunca muhte\u015fem s\u00fcpernova patlamalar\u0131nda milyarlarca y\u0131ld\u0131z meydana geldi, b\u00fcy\u00fcd\u00fc ve en sonunda \u00f6ld\u00fc. Peki b\u00fct\u00fcn bu y\u0131ld\u0131zlar\u0131n cesetleri nerede gizleniyor?<\/p>\n
G\u00f6kbilimciler, 25 A\u011fustos\u2019ta \u0130ngiliz Kraliyet Astronomi Derne\u011fi\u2019nin ayl\u0131k b\u00fclteninde yay\u0131nlad\u0131klar\u0131 yeni bir ara\u015ft\u0131rmada, uzun zamand\u0131r kay\u0131p olan bu y\u0131ld\u0131z kal\u0131nt\u0131lar\u0131n\u0131 ortaya \u00e7\u0131karmak amac\u0131yla yola \u00e7\u0131kt\u0131lar. Ekip, bir bilgisayar sim\u00fclasyonu kullanarak olu\u015fum a\u015famas\u0131ndaki Samanyolu\u2019nda do\u011fan milyonlarca y\u0131ld\u0131z\u0131n ilk konumlar\u0131n\u0131 modelledi; ard\u0131ndan, bu y\u0131ld\u0131zlar\u0131n s\u00fcpernovaya d\u00f6n\u00fc\u015ft\u00fckten sonra etrafa da\u011f\u0131lan kal\u0131nt\u0131lar\u0131n\u0131n nerede olabilece\u011fini a\u00e7\u0131\u011fa \u00e7\u0131karmak amac\u0131yla kozmik bir ileri sarma d\u00fc\u011fmesine bast\u0131.<\/p>\n
Olu\u015fan harita, Samanyolu\u2019nun her bir k\u00f6\u015fesinde ve \u00e7ok daha \u00f6telerde saklanan (a\u015f\u0131r\u0131 derece yo\u011fun y\u0131ld\u0131z kal\u0131nt\u0131lar\u0131n\u0131n iki bi\u00e7imi olan) kara deliklerin ve n\u00f6tron y\u0131ld\u0131zlar\u0131n\u0131n \u201cgalaktik yeralt\u0131 d\u00fcnyas\u0131n\u0131\u201d g\u00f6zler \u00f6n\u00fcne serdi. Ara\u015ft\u0131rmac\u0131lar\u0131n aktard\u0131\u011f\u0131 kadar\u0131yla, galaktik yeralt\u0131 d\u00fcnyas\u0131, Samanyolu\u2019nun b\u00fcy\u00fckl\u00fc\u011f\u00fcn\u00fcn \u00fc\u00e7 kat\u0131ndan daha geni\u015f bir alana yay\u0131l\u0131rken, galaksinin \u00f6l\u00fc y\u0131ld\u0131zlar\u0131n\u0131n \u00fc\u00e7te biri, kendi ya\u015famlar\u0131n\u0131 sona erdiren patlamalar\u0131n g\u00fcc\u00fcyle asla geri d\u00f6nmemek \u00fczere uzay\u0131n derinliklerine sa\u00e7\u0131ld\u0131.<\/p>\n
Y\u0131ld\u0131zlar da yeniden do\u011far\u00a0\u00a0<\/span><\/p>\n Sydney \u00dcniversitesi\u2019nde doktora aday\u0131 ve makalenin ba\u015fyazar\u0131 olan David Sweeney yapt\u0131\u011f\u0131 a\u00e7\u0131klamada, \u201cS\u00fcpernova patlamalar\u0131 asimetriktir ve kal\u0131nt\u0131lar saatte milyonlarca kilometreye varan y\u00fcksek h\u0131zlarda etrafa sa\u00e7\u0131l\u0131r\u201d diyor: \u201c\u0130nan\u0131lmaz bi\u00e7imde, g\u00f6k cisimlerinin y\u00fczde 30\u2019u galaksiden tamamen d\u0131\u015far\u0131 at\u0131ld\u0131.\u201d<\/p>\n Ekip, ara\u015ft\u0131rmalar\u0131nda iki \u00e7e\u015fit y\u0131ld\u0131z kal\u0131nt\u0131s\u0131na odakland\u0131: G\u00fcne\u015f\u2019in k\u00fctlesini bir kentten daha geni\u015f olmayan bir k\u00fcreye s\u0131\u011fd\u0131ran a\u015f\u0131r\u0131 yo\u011fun y\u0131ld\u0131z \u00e7ekirdekleri olan n\u00f6tron y\u0131ld\u0131zlar\u0131 ve \u0131\u015f\u0131\u011f\u0131n dahi k\u00fctle\u00e7ekimsel etkilerinden ka\u00e7amad\u0131\u011f\u0131 a\u015f\u0131r\u0131 derecede yo\u011fun nesneler olan kara delikler.<\/p>\n Her iki nesne t\u00fcr\u00fc de b\u00fcy\u00fck k\u00fctleye sahip y\u0131ld\u0131zlar\u0131n yak\u0131t\u0131n\u0131n bitti\u011fi ve \u00e7ekirdekleri i\u00e7e do\u011fru \u00e7\u00f6kerken devasa s\u00fcpernova patlamalar\u0131nda d\u0131\u015f gaz katmanlar\u0131n\u0131 uzaya sa\u00e7t\u0131\u011f\u0131 s\u0131rada olu\u015fur. \u00d6l\u00fcm a\u015famas\u0131ndaki y\u0131ld\u0131z, G\u00fcne\u015f\u2019in en az sekiz kat\u0131 kadar k\u00fctleye sahip oldu\u011funda bir n\u00f6tron y\u0131ld\u0131z\u0131na d\u00f6n\u00fc\u015f\u00fcr; y\u0131ld\u0131z e\u011fer G\u00fcne\u015f\u2019in 25 kat\u0131ndan fazla bir k\u00fctleye sahipse ortaya bir kara delik \u00e7\u0131kar.<\/p>\n G\u00f6kbilimciler, galaksimizde her iki y\u0131ld\u0131z kal\u0131nt\u0131s\u0131 s\u0131n\u0131f\u0131n\u0131 da tespit ettiler; ne var ki bu, Samanyolu\u2019nun ge\u00e7mi\u015finde olu\u015fan milyarlarca \u00f6l\u00fc y\u0131ld\u0131z\u0131 denkleme eklemek s\u00f6z konusu oldu\u011funda neredeyse yetersiz g\u00f6r\u00fcn\u00fcyordu. Bu eski kal\u0131nt\u0131lar\u0131 bulmak iki temel sebepten \u00f6t\u00fcr\u00fc \u00e7ok g\u00fc\u00e7: \u0130lk olarak, Samanyolu son 13 milyar y\u0131l zarf\u0131nda b\u00fcy\u00fck oranda \u015fekilsel de\u011fi\u015fikli\u011fe u\u011fram\u0131\u015ft\u0131r, yani galaktik yeralt\u0131 d\u00fcnyas\u0131 galaksimizdeki mevcut y\u0131ld\u0131z da\u011f\u0131l\u0131m\u0131yla do\u011fru bi\u00e7imde \u00f6rt\u00fc\u015fmemektedir. \u0130kinci olaraksa, s\u00fcpernova s\u00fcrecinde \u00f6len y\u0131ld\u0131zlar, patlaman\u0131n kuvvetiyle rastgele y\u00f6nlerde b\u00fcy\u00fck mesafelere da\u011f\u0131larak galaksinin sa\u00e7aklar\u0131nda yok olmu\u015f ya da galaksiler aras\u0131 uzayda kaybolmu\u015ftur.<\/p>\n Ara\u015ft\u0131rman\u0131n yazarlar\u0131, bu rastlant\u0131sall\u0131kla birlikte Samanyolu\u2019nun de\u011fi\u015fime u\u011frayan \u015feklini ve ba\u015fka pek \u00e7ok etkeni denkleme eklemek amac\u0131yla bir bilgisayar sim\u00fclasyonu olu\u015fturdular. Ula\u015ft\u0131klar\u0131 sonu\u00e7lar, en yo\u011fun y\u0131ld\u0131z kal\u0131nt\u0131s\u0131 birikimlerinin, s\u00fcper k\u00fctleli kara deli\u011fin a\u015f\u0131r\u0131 d\u00fczeyde g\u00fc\u00e7l\u00fc \u00e7ekim uygulad\u0131\u011f\u0131 bir b\u00f6lge olan galaksinin merkezine yak\u0131n bir yerde bulunabilece\u011fini ortaya koyuyor. \u00d6l\u00fc y\u0131ld\u0131zlar\u0131n kalan k\u0131sm\u0131, g\u00fcn\u00fcm\u00fczde g\u00f6r\u00fclebilen y\u0131ld\u0131zlar\u0131n sarmal \u015feklindeki da\u011f\u0131l\u0131m\u0131na bariz bi\u00e7imde meydan okuyarak galaksinin d\u00f6rt bir k\u00f6\u015fesine \u00e7\u0131lg\u0131nca da\u011f\u0131lm\u0131\u015f halde.<\/p>\n Sweeney, \u201cBu yo\u011fun \u00f6l\u00fc y\u0131ld\u0131z kal\u0131nt\u0131lar\u0131, temelde g\u00f6r\u00fcn\u00fcr galaksiden farkl\u0131 bir da\u011f\u0131l\u0131m ve yap\u0131 ortaya koyuyor\u201d diye ekliyor.<\/p>\n Ekip bunun yan\u0131 s\u0131ra, \u2018galaktik yeralt\u0131 d\u00fcnyas\u0131n\u0131n\u2019, galaksinin toplam k\u00fctlesinin tahminen sadece y\u00fczde 1\u2019ini kapsamas\u0131na kar\u015f\u0131n, eski y\u0131ld\u0131z kal\u0131nt\u0131lar\u0131n\u0131n hi\u00e7 de uzakta olmad\u0131\u011f\u0131n\u0131 ke\u015ffetti. En yak\u0131n\u0131m\u0131zdaki y\u0131ld\u0131z kal\u0131nt\u0131s\u0131, G\u00fcne\u015f\u2019ten sadece yakla\u015f\u0131k 65 \u0131\u015f\u0131k y\u0131l\u0131 uzakl\u0131kta, yani B\u00fcy\u00fck Ay\u0131 tak\u0131my\u0131ld\u0131z\u0131n\u0131n y\u0131ld\u0131zlar\u0131ndan daha yak\u0131n olmal\u0131. Umut ederiz ki, onlar\u0131 nerede arayaca\u011f\u0131n\u0131za ili\u015fkin daha isabetli bir fikirle, Avrupa Uzay Ajans\u0131\u2019n\u0131n s\u00fcrmekte olan Gaia misyonu gibi uzay ara\u015ft\u0131rmalar\u0131, galaksinin eski \u00f6l\u00fclerini her zamankinden daha fazla say\u0131da ortaya \u00e7\u0131karmaya yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":" Samanyolu\u2019nun yakla\u015f\u0131k 13,6 milyar y\u0131ll\u0131k tarihi boyunca muhte\u015fem s\u00fcpernova patlamalar\u0131nda milyarlarca y\u0131ld\u0131z meydana geldi, b\u00fcy\u00fcd\u00fc ve en sonunda \u00f6ld\u00fc. Peki b\u00fct\u00fcn bu y\u0131ld\u0131zlar\u0131n cesetleri nerede gizleniyor? G\u00f6kbilimciler, 25 A\u011fustos\u2019ta \u0130ngiliz Kraliyet Astronomi Derne\u011fi\u2019nin ayl\u0131k b\u00fclteninde yay\u0131nlad\u0131klar\u0131 yeni bir ara\u015ft\u0131rmada, uzun zamand\u0131r kay\u0131p olan bu y\u0131ld\u0131z kal\u0131nt\u0131lar\u0131n\u0131 ortaya \u00e7\u0131karmak amac\u0131yla yola \u00e7\u0131kt\u0131lar. Ekip, bir bilgisayar sim\u00fclasyonu […]<\/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-222135","post","type-post","status-publish","format-standard","hentry","category-astronomi"],"acf":[],"yoast_head":"\n