![\"\u015eekil](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/04\/\u015fekil-1-001-300x226.jpg\")
ALMA, Samanyolu G\u00f6kadas\u0131\u2019n\u0131n merkezinde Sagittarius A (Sgr A) olarak bilinen b\u00f6lgedeki s\u00fcper k\u00fctleli karadelikten \u00fc\u00e7 \u0131\u015f\u0131k y\u0131l\u0131 uzakl\u0131kta, 11 tane d\u00fc\u015f\u00fck k\u00fctleli y\u0131ld\u0131z\u0131n olu\u015ftu\u011funu a\u00e7\u0131k bir bi\u00e7imde sergiledi. Oysa s\u00fcper k\u00fctleli karadeli\u011fin \u00e7ekim kuvvetinin bu uzakl\u0131ktaki gaz ve tozu y\u0131ld\u0131zlar olu\u015fmadan da\u011f\u0131tma g\u00fcc\u00fcne sahip olmas\u0131 beklenir.<\/p>\n
Bu yeni ke\u015ffedilmi\u015f olan \u00f6n y\u0131ld\u0131zlar<\/strong> (protostars – yo\u011fun gaz bulutu a\u015famas\u0131yla gen\u00e7 parlayan y\u0131ld\u0131z a\u015famas\u0131 aras\u0131ndaki d\u00f6nem) d\u00fc\u015f\u00fck k\u00fctleli y\u0131ld\u0131zlar\u0131n do\u011fumu i\u00e7in gerekli olan ko\u015fullar\u0131n, g\u00f6kadam\u0131zdaki ve evrenin herhangi bir k\u00f6\u015fesindeki en tedirgin b\u00f6lgelerde de olu\u015fabilece\u011fini g\u00f6steriyor. Bulgu Astrophysical Journal Letters<\/em> dergisinde yay\u0131mlanm\u0131\u015ft\u0131r.<\/p>\n Makalenin ilk yazar\u0131 ve ABD Illinois eyaleti Evanston\u2019daki Northwestern \u00dcniversitesi g\u00f6kbilimcisi Farhad Yusef-Zadeh \u015funlar\u0131 s\u00f6yledi: \u201cT\u00fcm tuhafl\u0131klara kar\u015f\u0131n, Samanyolu G\u00f6kadas\u0131 merkezindeki s\u00fcper k\u00fctleli karadeli\u011fin yak\u0131nlar\u0131nda y\u0131ld\u0131z olu\u015fumlar\u0131na ili\u015fkin kan\u0131tlar\u0131 \u015fa\u015f\u0131rt\u0131c\u0131 bir bi\u00e7imde g\u00f6zledik. Bu ger\u00e7ekten s\u00fcrpriz bir sonu\u00e7 ve y\u0131ld\u0131z olu\u015fumlar\u0131n\u0131n en d\u00fc\u015f\u00fck olas\u0131l\u0131kl\u0131 y\u00f6relerde de olu\u015fabilece\u011fini g\u00f6steriyor.\u201d<\/p>\n ALMA verileri \u00f6n y\u0131ld\u0131zlar\u0131n ya\u015flar\u0131n\u0131n yakla\u015f\u0131k 6000 y\u0131l oldu\u011funa i\u015faret ediyor. Yusef-Zadeh bu ba\u011flamda \u015funlar\u0131 s\u00f6yledi: \u201cBu \u00e7ok \u00f6nemli bir veri \u00e7\u00fcnk\u00fc olduk\u00e7a y\u0131k\u0131c\u0131 ortamdaki y\u0131ld\u0131z olu\u015fumlar\u0131n\u0131n en erken evresine tan\u0131k oluyoruz.\u201d<\/p>\n Ara\u015ft\u0131rma grubu \u00f6n y\u0131ld\u0131zlara klasik \u201c\u00e7ift \u015fi\u015fim<\/strong>\u201di (double lobes) g\u00f6zleyerek tan\u0131 koydular (\u015eekil 3). \u00c7ift \u015fi\u015fim her iki y\u0131ld\u0131z\u0131 da kucaklayan g\u00f6r\u00fcn\u00fcm sergiler. Bu kozmik kum saati benzeri \u015fekil, y\u0131ld\u0131z olu\u015fumunun erken evrelerinde g\u00f6zlenir. \u015ei\u015fimlerdeki karbon monoksit (CO) gibi molek\u00fcller varl\u0131klar\u0131n\u0131 milimetre dalgaboylar\u0131nda parlak bir bi\u00e7imde sergiler. ALMA teleskoplar a\u011f\u0131 bu dalgaboylar\u0131n\u0131 do\u011frulukla ve duyarl\u0131l\u0131kla alg\u0131lar.<\/p>\n 4 milyon G\u00fcne\u015f k\u00fctlesine sahip karadelik i\u00e7eren Samanyolu g\u00f6kadas\u0131n\u0131n merkezi Yer\u2019den yakla\u015f\u0131k 26.000 \u0131\u015f\u0131k y\u0131l\u0131 uzakl\u0131kta ve Sagittarius tak\u0131my\u0131ld\u0131z\u0131 y\u00f6n\u00fcndedir. Y\u0131ld\u0131zlararas\u0131 ortamdaki devasa toz k\u00fctlesi bu b\u00f6lgenin g\u00f6rsel (optik) b\u00f6lge teleskoplar\u0131 taraf\u0131ndan incelenmesini engeller. Radyo dalgalar\u0131, milimetre ve alt milimetre dalgaboylar\u0131nda g\u00f6nderilen \u0131\u015f\u0131n\u0131m ALMA teleskoplar a\u011f\u0131 taraf\u0131ndan alg\u0131lan\u0131r. ALMA toz bulutu i\u00e7inden gelen radyo ve k\u0131z\u0131l\u00f6te dalgaboylar\u0131ndaki \u0131\u015f\u0131n\u0131m\u0131 alg\u0131lad\u0131\u011f\u0131 i\u00e7in y\u0131ld\u0131z olu\u015fumlar\u0131 i\u00e7in y\u0131k\u0131c\u0131 olan bu b\u00f6lgenin dinami\u011fi ve i\u00e7eri\u011fine ili\u015fkin a\u00e7\u0131k ve net g\u00f6r\u00fcnt\u00fc sunar.<\/p>\n ALMA g\u00f6zlemlerinden \u00f6nce Yusef-Zadeh ve ara\u015ft\u0131rma ekibi Sgr A yak\u0131n kom\u015fulu\u011fundaki b\u00f6lgeye ili\u015fkin g\u00f6zlemlerden \u00e7ok say\u0131da ve 6 milyon y\u0131l ya\u015f\u0131nda k\u00fctleli ve yeni olu\u015fmakta olan y\u0131ld\u0131zlar\u0131n varl\u0131\u011f\u0131n\u0131n tan\u0131s\u0131n\u0131 yapm\u0131\u015flard\u0131. Bu t\u00fcr g\u00f6kcisimleri proplyds<\/strong> olarak betimlenir ve Orion bulutsusu gibi daha uygun ortamlardaki y\u0131ld\u0131z olu\u015fum b\u00f6lgelerinde olduk\u00e7a yayg\u0131nd\u0131r. Samanyolu G\u00f6kadas\u0131 merkez b\u00f6lgesi y\u0131ld\u0131z olu\u015fumlar\u0131n\u0131 engelleyici olmas\u0131na kar\u015f\u0131n yo\u011fun hidrojen b\u00f6lgeleri y\u0131ld\u0131z olu\u015fum e\u015fik d\u00fczeyini a\u015f\u0131p yeni y\u0131ld\u0131zlar\u0131n olu\u015fmas\u0131n\u0131 sa\u011flayabilir.<\/p>\n ALMA g\u00f6zlemleri \u00e7ok ilgin\u00e7 ve s\u00fcrprize neden olan veriler sunmu\u015f, 11 tane d\u00fc\u015f\u00fck k\u00fctleli y\u0131ld\u0131z\u0131n g\u00f6kadam\u0131z\u0131n merkezindeki s\u00fcper k\u00fctleli karadelikten 1 parsek -3 \u0131\u015f\u0131k y\u0131l\u0131- uzakl\u0131kta olu\u015ftuklar\u0131n\u0131 g\u00f6stermi\u015ftir. ALMA teleskoplar a\u011f\u0131n\u0131 kullanan Yusef-Zadeh ve ara\u015ft\u0131rma ekibi \u00f6n y\u0131ld\u0131zlar\u0131n k\u00fctleleri ve disklerindeki momentum aktar\u0131m oranlar\u0131n\u0131n g\u00f6kadam\u0131z\u0131n di\u011fer b\u00f6lgelerindeki \u00f6n y\u0131ld\u0131zlar\u0131nkiyle tutarl\u0131 oldu\u011funu g\u00f6stermi\u015flerdir.<\/p>\n Yukar\u0131da s\u00f6z\u00fc edilen Astrophysical Journal Letter<\/em> makalesindeki yazarlardan birisi, Virginia eyaleti Charlottesville\u2019deki National Radio Astronomy Observatory\u2019de g\u00f6revli Al Wootten, \u201cBu bulgu, Sagittarius A y\u0131ld\u0131z\u0131na \u00e7ok yak\u0131n olan y\u0131ld\u0131zlararas\u0131 bulutta y\u0131ld\u0131z olu\u015fumlar\u0131n\u0131n ger\u00e7ekle\u015fti\u011fine ili\u015fkin bir kan\u0131t olu\u015fturuyor. Bu ko\u015fullar ideal y\u0131ld\u0131z olu\u015fum ko\u015fullar\u0131ndan \u00e7ok farkl\u0131 da olsa, y\u0131ld\u0131zlar\u0131n olu\u015fumlar\u0131 i\u00e7in de\u011fi\u015fik yollar\u0131n varl\u0131\u011f\u0131n\u0131 g\u00f6rmemizi sa\u011flar\u201d a\u00e7\u0131klamas\u0131nda bulunmu\u015ftur.<\/p>\n Y\u0131ld\u0131z olu\u015fum ko\u015fulunun ger\u00e7ekle\u015febilmesi i\u00e7in g\u00f6kadam\u0131z\u0131n merkezinin yak\u0131nlar\u0131nda bulunan gaz bulutu d\u0131\u015f\u0131ndaki kuvvetler ortam\u0131n y\u0131k\u0131c\u0131 do\u011fas\u0131n\u0131 yenmeli, gaz\u0131 s\u0131k\u0131\u015ft\u0131rmal\u0131 ve bulutun kendine \u00f6zg\u00fc \u00e7ekim kuvvetiyle y\u0131ld\u0131zlar\u0131n olu\u015fumu sa\u011flanmal\u0131d\u0131r. G\u00f6kbilimciler y\u00fcksek h\u0131za sahip gaz bulutlar\u0131n\u0131n y\u0131ld\u0131zlararas\u0131 ortama do\u011fru devinirken y\u0131ld\u0131z olu\u015fumlar\u0131na yard\u0131mc\u0131 olabilece\u011fi y\u00f6n\u00fcnde g\u00f6r\u00fc\u015f belirtiyorlar. Karadelik \u00e7evresindeki toplanma disklerinden<\/strong> (accretion disc) d\u0131\u015far\u0131 do\u011fru f\u0131rlat\u0131lan jetler de gaz bulutlar\u0131nda s\u0131k\u0131\u015fmaya ve y\u0131ld\u0131z olu\u015fumlar\u0131n\u0131 tetiklemeye uygundur. Avustralya, Sidney\u2019deki Macquarie \u00dcniversitesi g\u00f6kbilimcisi Mark Wardle, \u201cBundan sonraki a\u015famada yeni olu\u015fan y\u0131ld\u0131zlar\u0131n \u00e7evresinde tozlu gazdan olu\u015fan toplanma disklerinin varl\u0131\u011f\u0131n\u0131 do\u011frulamal\u0131y\u0131z. E\u011fer do\u011frulayabilirsek, g\u00f6kada diskindeki gen\u00e7 y\u0131ld\u0131zlar\u0131n \u00e7evresinde oldu\u011fu gibi, diskteki merkezden gezegenlerin de olu\u015fma olas\u0131l\u0131\u011f\u0131 vard\u0131r.\u201d<\/p>\n Bu ara\u015ft\u0131rma, Yusef-Zadeh ve arkada\u015flar\u0131n\u0131n Astrophysical Journal Letters<\/em> adl\u0131 bilimsel dergide \u201cALMA Detection of Bipolar Outflows: Evidence for Low Mass Star Formation within 1 pc of Sgr A\u201d ba\u015fl\u0131\u011f\u0131yla yay\u0131mlanm\u0131\u015f olan makalelerinde sunulmu\u015ftur.<\/p>\n","protected":false},"excerpt":{"rendered":" ALMA, Samanyolu G\u00f6kadas\u0131\u2019n\u0131n merkezindeki s\u00fcper k\u00fctleli karadelik yak\u0131nlar\u0131nda yeni olu\u015fmakta olan y\u0131ld\u0131zlar alg\u0131lad\u0131. Oysa karadelik yak\u0131n kom\u015fulu\u011fu, yeni olu\u015fmakta olan y\u0131ld\u0131zlar i\u00e7in olduk\u00e7a \u201cy\u0131k\u0131c\u0131\u201d bir ortamd\u0131r. Samanyolu g\u00f6kadas\u0131n\u0131n merkezinde, s\u00fcper k\u00fctleli karadeli\u011fin hemen yan\u0131ndaki b\u00f6lge, \u00e7ekim kuvvetinin y\u0131k\u0131c\u0131 etkisi nedeniyle yeni olu\u015fmakta olan y\u0131ld\u0131zlar i\u00e7in y\u0131k\u0131m b\u00f6lgesidir. Bu b\u00f6lge ayn\u0131 zamanda ye\u011fin mor\u00f6te \u0131\u015f\u0131n\u0131m\u0131yla bombalanmaktad\u0131r. […]<\/p>\n","protected":false},"author":475,"featured_media":22839,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19],"tags":[2794,2239,2795,2780],"class_list":["post-22838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","tag-alma-teleskop-agi","tag-karadelik","tag-onyildiz","tag-samanyolu-galaksisi"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/22838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/users\/475"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=22838"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/22838\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/22839"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=22838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=22838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=22838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/04\/\u015eekil-2-001-300x226.jpg\")
![\"\"](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/04\/\u015eekil-2nin-yan\u0131na-001-163x300.jpg\")
\u00d6n y\u0131ld\u0131zlar y\u0131ld\u0131zlararas\u0131 gaz ve tozdan olu\u015fur. Bu bulutlardaki yo\u011fun merkez b\u00f6lgeleri kendi \u00e7ekimsel kuvvetlerinin etkisi alt\u0131nda \u00e7\u00f6ker ve yak\u0131n kom\u015fulu\u011fundaki bulutlardan y\u0131ld\u0131z olu\u015fturan gaz\u0131 giderek artan oranlarda biriktirir. \u00c7ekim merkezi olu\u015fturan b\u00f6lgelerin \u00fczerine akan madde her zaman merkez b\u00f6lgesi \u00fczerine d\u00fc\u015fmez, \u00f6n y\u0131ld\u0131z\u0131n kuzey ve g\u00fcney kutuplar\u0131ndan bir \u00e7ift y\u00fcksek h\u0131z jetleri olarak ortama sa\u00e7\u0131l\u0131r. Son derece tedirgin ve \u00e7alkant\u0131l\u0131 ortamlar maddenin \u00f6n y\u0131ld\u0131z\u0131n \u00fczerine d\u00fc\u015fmesini engellerken ye\u011fin \u0131\u015f\u0131n\u0131m -yak\u0131n kom\u015fuluktaki k\u00fctleli y\u0131ld\u0131zlardan ve s\u00fcperk\u00fctleli karadeliklerden- gaz ve tozdan olu\u015fan y\u0131ld\u0131z do\u011fum b\u00f6lgelerini da\u011f\u0131t\u0131r, \u00e7ok k\u00fctleli y\u0131ld\u0131zlar d\u0131\u015f\u0131nda di\u011fer y\u0131ld\u0131zlar\u0131n olu\u015fumunu engeller.<\/p>\n![\"\"](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2018\/04\/\u015fekil-3-001-300x144.jpg\")