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Konstantinos, \u201cBonn ve Harvard \u00dcniversitelerindeki \u00e7al\u0131\u015fma arkada\u015flar\u0131m\u0131zla yapt\u0131\u011f\u0131m\u0131z \u00e7al\u0131\u015fmada, g\u00fcn\u00fcm\u00fcz evrenindeki 800 g\u00f6kada k\u00fcmesinin davran\u0131\u015f\u0131n\u0131 inceledik. E\u011fer
\ny\u00f6nba\u011f\u0131ms\u0131zl\u0131k hipotezi do\u011fu olsayd\u0131, uzay\u0131n t\u00fcm y\u00f6nlerindeki g\u00f6kada k\u00fcmelerinin \u00f6zellikleri ayn\u0131 olacakt\u0131. Ancak biz \u00e7ok \u00f6nemli farkl\u0131l\u0131klar g\u00f6zledik\u201d de\u011ferlendirmesini yapt\u0131.<\/p>\n
G\u00f6kbilimciler, g\u00f6kada k\u00fcmelerini kaplayan s\u0131cak gaz\u0131n X-\u0131\u015f\u0131n s\u0131cakl\u0131k \u00f6l\u00e7\u00fcmlerini kullanarak, elde ettikleri verileri g\u00f6kada k\u00fcmelerinin g\u00f6r\u00fcn\u00fcrdeki parlakl\u0131klar\u0131yla kar\u015f\u0131la\u015ft\u0131rd\u0131lar. Ayn\u0131 s\u0131cakl\u0131kta ve ayn\u0131 uzakl\u0131kta bulunan g\u00f6kada k\u00fcmelerinin ayn\u0131 g\u00f6r\u00fcn\u00fcrdeki parlakl\u0131\u011fa sahip olmalar\u0131 gerekirdi. Ancak g\u00f6kbilimcilerin g\u00f6zlem verileri buna i\u015faret etmiyor.<\/p>\n
Thomas, \u201cAyn\u0131 \u00f6zelliklere ve benzer s\u0131cakl\u0131klara sahip g\u00f6kada k\u00fcmelerinin uzay\u0131n bir y\u00f6n\u00fcnde daha s\u00f6n\u00fck di\u011fer y\u00f6n\u00fcnde daha parlak oldu\u011funu g\u00f6rd\u00fck. Aradaki fark y\u00fczde 30 denli b\u00fcy\u00fckt\u00fc. Bu farklar geli\u015fig\u00fczel de\u011fil, uzay\u0131n g\u00f6zledi\u011fimiz b\u00f6lgelerine ba\u011fl\u0131 olarak belli bir desen g\u00f6steriyor\u201d saptamas\u0131nda bulundu.<\/p>\n
Konstantinos ve \u00e7al\u0131\u015fma arkada\u015flar\u0131, g\u00f6kada k\u00fcmelerinin uzakl\u0131klar\u0131n\u0131 de\u011ferlendirme \u00f6l\u00e7\u00fct\u00fc sunan ve yayg\u0131n olarak onanan kozmolojik modele meydan okumadan \u00f6nce di\u011fer olas\u0131 a\u00e7\u0131klamalar\u0131 da dikkate ald\u0131lar. Teleskoplar\u0131n g\u00f6r\u00fc\u015f\u00fcn\u00fc etkileyebilecek alg\u0131lanamam\u0131\u015f gaz ve toz bulutlar\u0131 belli b\u00f6lgelerdeki g\u00f6kada k\u00fcmelerinin g\u00f6r\u00fcn\u00fcrdeki parlakl\u0131klar\u0131n\u0131 azaltm\u0131\u015f olabilir. Ancak veriler bu senaryoyu desteklemiyor.<\/p>\n
Uzay\u0131n baz\u0131 b\u00f6lgelerindeki g\u00f6kada k\u00fcmelerinin da\u011f\u0131l\u0131m\u0131 s\u00fcper g\u00f6kada k\u00fcmelerinin devasa k\u00fctlelerinin neden oldu\u011fu gravitasyonel \u00e7ekimden etkilenmi\u015f olabilir. Bu hipotez de ge\u00e7erli g\u00f6r\u00fcnm\u00fcyor. Konstantinos, \u00e7al\u0131\u015fma ekibinin elde ettikleri bulgunun beklenmedik, s\u00fcrpriz bir bulgu oldu\u011funu da dile getiriyor.<\/p>\n Konstantinos, \u201cE\u011fer uzay\u0131n son birka\u00e7 milyar y\u0131ldaki geni\u015flemesi, verilerimizin i\u015faret etti\u011fi gibi y\u00f6nba\u011f\u0131ml\u0131ysa (anisotropic), b\u00fcy\u00fck bir paradigma de\u011fi\u015fikli\u011fine neden olacakt\u0131r, \u00e7\u00fcnk\u00fc \u00f6zelliklerini \u00e7\u00f6z\u00fcmlemeye \u00e7al\u0131\u015ft\u0131\u011f\u0131m\u0131z her bir g\u00f6kcisminin uzaydaki y\u00f6n\u00fc dikkate al\u0131nmal\u0131d\u0131r. \u00d6rne\u011fin, g\u00fcn\u00fcm\u00fczde, \u00e7ok uzaklardaki cisimlerin uzakl\u0131\u011f\u0131n\u0131 de\u011ferlendirirken bir dizi kozmolojik parametreler ve e\u015fitlikler kullan\u0131yoruz. Bu parametrelerin her y\u00f6nde e\u015fit oldu\u011funa inan\u0131yoruz. E\u011fer g\u00f6zlem verilerinden ula\u015ft\u0131\u011f\u0131m\u0131z sonu\u00e7 do\u011fruysa, bu varsay\u0131m ge\u00e7ersizdir ve \u00f6nceki d\u00f6nemlerde sundu\u011fumuz sonu\u00e7lar\u0131 yeniden g\u00f6zden ge\u00e7irmeliyiz\u201d saptamas\u0131nda bulunuyor.<\/p>\n ESA\u2019daki XMM-Newton projesinden biliminsan\u0131 Norbert Schartel, \u201cBu devasa b\u00fcy\u00fcleyici bir sonu\u00e7. \u00d6nceki \u00e7al\u0131\u015fmalar g\u00fcn\u00fcm\u00fcz evreninin t\u00fcm y\u00f6nlerde ayn\u0131 oranda, y\u00f6nba\u011f\u0131ms\u0131z geni\u015fledi\u011fine i\u015faret ediyordu, ancak yapt\u0131\u011f\u0131m\u0131z \u00e7al\u0131\u015fma -g\u00f6kada k\u00fcmelerinin X-\u0131\u015f\u0131n penceresinden yap\u0131lan s\u0131nama- \u00e7ok b\u00fcy\u00fck \u00f6neme ve gelecek ara\u015ft\u0131rmalar i\u00e7in b\u00fcy\u00fck gizilg\u00fcce (potansiyele) sahip oldu\u011funa i\u015faret ediyor\u201d dedi.<\/p>\n Biliminsanlar\u0131, evrenin geni\u015flemesinde y\u00f6nba\u011f\u0131ml\u0131l\u0131\u011fa i\u015faret eden bu etkiye, evrenin gizemli bile\u015feni olan ve evrenin t\u00fcm erkesinin yakla\u015f\u0131k olarak y\u00fczde 69 denlisini olu\u015fturdu\u011fu ileri s\u00fcr\u00fclen karanl\u0131k enerjinin neden olabilece\u011fi spek\u00fclasyonunda bulunuyorlar. G\u00fcn\u00fcm\u00fczde, evrenin son birka\u00e7 milyar y\u0131ldaki ivmelenmi\u015f geni\u015flemesinden sorumlu tutulan karanl\u0131k enerji hakk\u0131nda \u00e7ok az \u015fey biliniyor.<\/p>\n ESA\u2019n\u0131n yak\u0131n gelecekte yap\u0131lacak olan Euclid adl\u0131 teleskobu, milyarlarca g\u00f6kadan\u0131n g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc elde etme, evrenin geni\u015flemesini, karanl\u0131k erkenin do\u011fas\u0131n\u0131 ve geni\u015flemenin ivmesini do\u011fru bir bi\u00e7imde saptamak \u00fczere tasarland\u0131. Bu teleskop, gelecekte evrenbilimdeki gizemleri \u00e7\u00f6zmede yard\u0131mc\u0131 olabilir. Euclid ger\u00e7ekten tam da bu gereksinimi kar\u015f\u0131layabilir. 2022 y\u0131l\u0131nda uzaya g\u00f6nderilecek olan uydu, evreni de\u011fi\u015fik y\u00f6nlerde farkl\u0131 geni\u015fleten karanl\u0131k enerjiye ili\u015fkin kan\u0131t bulman\u0131n yan\u0131 s\u0131ra, biliminsanlar\u0131n\u0131n \u00e7ok say\u0131da g\u00f6kada k\u00fcmelerinin \u00f6zelliklerine ili\u015fkin daha fazla veri elde etmelerini de sa\u011flay\u0131p, g\u00fcn\u00fcm\u00fcz bulgular\u0131n\u0131 ya destekler ya da yanl\u0131\u015flar.<\/p>\n Bu ba\u011flamda ek veriler, Yer-\u00f6tesi fizik ara\u015ft\u0131rmalar\u0131 i\u00e7in Max Planck Enstit\u00fcs\u00fc taraf\u0131ndan yap\u0131lan X-\u0131\u015f\u0131n eROSITA ayg\u0131t\u0131ndan gelecektir. Son zamanlarda uzaya f\u0131rlat\u0131lan Alman-Rus yap\u0131m\u0131 Spektr-RG uydusundaki X-\u0131\u015f\u0131n eROSITA ayg\u0131t\u0131, orta enerjili X-\u0131\u015f\u0131nlar\u0131nda uzay\u0131n ilk kez taramas\u0131n\u0131 yapacak, bug\u00fcne dek g\u00f6zlenemeyen binlerce g\u00f6kada k\u00fcmelerini ve etkin g\u00f6kada \u00f6zeklerini ke\u015ffetme amac\u0131na odaklanacakt\u0131r.<\/p>\n Bu ba\u011flamda ek bilgi a\u015fa\u011f\u0131daki kaynaktan ve ara\u015ft\u0131rmac\u0131lardan elde edilebilir:<\/p>\n – Probing cosmic isotropy with a new X-ray galaxy cluster sample through the LX\u2212Tscaling relation, by K. Migkas et al. (2020) is published in Astronomy & Astrophysics (DOI: 10.1051\/0004-6361\/201936602).<\/p>\n – Konstantinos Migkas, Argelander Institute for Astronomy, University of Bonn, Germany Email: kmigkas@astro.uni-bonn.de<\/p>\n – Thomas Reiprich, Argelander Institute for Astronomy, University of Bonn, Germany Email: reiprich@astro.uni-bonn.de<\/p>\n – Norbert Schartel, XMM-Newton project scientist, European Space Agency Email: Norbert.Schartel@esa.int<\/p>\n – ESA Media Relations Email: media@esa.int<\/p>\n Kaynak:<\/strong> http:\/\/www.esa.int\/Science_Exploration\/Space_Science\/Rethinking_cosmology_Univ erse_expansion_may_not_be_uniform<\/p>\n","protected":false},"excerpt":{"rendered":" G\u00f6kbilimciler, on y\u0131llard\u0131r uzay\u0131n her y\u00f6ne ayn\u0131 h\u0131zla, di\u011fer deyi\u015fle y\u00f6nba\u011f\u0131ms\u0131z (isotropic) olarak geni\u015fledi\u011fini varsayd\u0131lar. ESA\u2019n\u0131n XMM-Newton, NASA\u2019n\u0131n Chandra ve Alman-led ROSAT X-\u0131\u015f\u0131n uydular\u0131yla elde edilen veriler, evrenbilimin bu \u00f6nemli varsay\u0131m\u0131n\u0131n yanl\u0131\u015f olabilece\u011fine i\u015faret ediyor. Almanya\u2019n\u0131n Bonn \u00dcniversitesi\u2019nde doktora \u00f6\u011frencisi Konstantinos Migkas ve dan\u0131\u015fman\u0131 Thomas Reiprich, uzay\u0131n geni\u015flemesiyle ilgili y\u00f6nba\u011f\u0131ms\u0131zl\u0131k hipotezinin s\u0131nanmas\u0131 i\u00e7in g\u00f6kbilimcilerin kullanabilece\u011fi […]<\/p>\n","protected":false},"author":475,"featured_media":42017,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19],"tags":[6136,1652,2085,324,391,392],"class_list":["post-42016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","tag-genisleme","tag-gokada","tag-karanlik-enerji","tag-kozmoloji","tag-uydu","tag-uzay"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t![\"\"](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2020\/04\/2-12-300x300.jpg\")
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\nESA\u2019daki Euclid projesinde \u00e7al\u0131\u015fan biliminsan\u0131 Ren\u00e9 Laureijs, \u015fu saptamada bulundu: \u201cBulgular ger\u00e7ekten \u00e7ok ilgin\u00e7, ancak \u00e7al\u0131\u015fmadaki \u00f6rnekler geni\u015f kapsaml\u0131 sonu\u00e7lar \u00e7\u0131karmak i\u00e7in gerekli olan say\u0131dan g\u00f6reli olarak az. Eldeki verilerle yap\u0131labilecek en iyi \u00e7\u0131karsama bu, ancak geni\u015f olarak onanm\u0131\u015f olan evrenbilim modelini ger\u00e7ekten g\u00f6zden ge\u00e7irmemiz i\u00e7in daha fazla veriye gereksinim var.\u201d<\/p>\n![\"\"](\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2020\/04\/3-300x172.png\")