{"id":90069,"date":"2024-03-31T14:10:46","date_gmt":"2024-03-31T12:10:46","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=90069"},"modified":"2024-03-31T14:10:46","modified_gmt":"2024-03-31T12:10:46","slug":"va-va-uimi-o-noua-imagine-a-gaurii-negre-din-centrul-galaxiei-noastre-reala-sau-modelata-pe-calculator","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/va-va-uimi-o-noua-imagine-a-gaurii-negre-din-centrul-galaxiei-noastre-reala-sau-modelata-pe-calculator\/","title":{"rendered":"V\u0103 va uimi: o nou\u0103 imagine a g\u0103urii negre din centrul galaxiei noastre! Real\u0103 sau modelat\u0103 pe calculator?"},"content":{"rendered":"

\"\"<\/a>\u00cen inima galaxiei noastre Calea Lactee se afl\u0103 un gigant. Este o gaur\u0103 neagr\u0103 masiv\u0103, numit\u0103 S\u0103get\u0103tor A* (pronun\u021bat „S\u0103get\u0103tor o stea”), c\u00e2nt\u0103rind p\u00e2n\u0103 la 4,3 milioane de sori. Dup\u0103 ce au f\u0103cut o imagine f\u0103r\u0103 precedent a obiectului \u00een 2022, astronomii au surprins acum o nou\u0103 vedere remarcabil\u0103 a g\u0103urii negre, dezv\u0103luind c\u00e2mpurile sale magnetice puternice. Oamenii de \u0219tiin\u021b\u0103 au capturat gaura neagr\u0103 \u00een lumin\u0103 polarizat\u0103, ceea ce implic\u0103 utilizarea unui filtru pentru a vizualiza diferite caracteristici ale obiectului \u00eendep\u0103rtat (c\u00e2mpurile magnetice sunt create de particulele \u00eenc\u0103rcate \u00een mi\u0219care.)<\/p>\n

„Ceea ce vedem acum este c\u0103 exist\u0103 c\u00e2mpuri magnetice puternice, r\u0103sucite \u0219i organizate \u00een apropierea g\u0103urii negre din centrul galaxiei Calea Lactee”<\/em>, a spus Sara Issaoun, bursant\u0103 la Centrul de Astrofizic\u0103 NASA Harvard Smithsonian, care a fost una din coordonatorii activit\u0103\u0163ii de cercetare.<\/p>\n

G\u0103urile negre ad\u0103postesc at\u00e2t de mult\u0103 gravita\u021bie \u00eenc\u00e2t nici m\u0103car lumina nu poate sc\u0103pa – pentru c\u0103 sunt obiecte aproape inimaginabil de dense \u0219i masive. Cu c\u00e2t un obiect are mai mult\u0103 mas\u0103, cu at\u00e2t atrac\u021bia gravita\u021bional\u0103 este mai puternic\u0103. Dac\u0103 P\u0103m\u00e2ntul ar fi (ipotetic) zdrobit \u00eentr-o gaur\u0103 neagr\u0103, ar avea o lungime de mai pu\u021bin de un centimetru.<\/p>\n

A\u015fadar, s-ar putea s\u0103 v\u0103 \u00eentreba\u021bi: cum putem vedea o gaur\u0103 neagr\u0103 dac\u0103 nu emite nicio lumin\u0103? De\u0219i nu putem vedea obiectul real, putem vedea materia – gaz intens fierbinte – \u00eenv\u00e2rtindu-se \u00een jurul unei g\u0103uri negre. O parte din acest material cade inevitabil \u00een gaura neagr\u0103, pentru a nu se mai \u00eentoarce niciodat\u0103; mare parte din ea este aruncat\u0103 \u00eenapoi \u00een Cosmos, deoarece g\u0103urile negre nu sunt consumatori eficien\u021bi de material galactic. Acolo unde lumina se termin\u0103 \u00een centrul imaginii este punctul f\u0103r\u0103 \u00eentoarcere, numit „orizontul evenimentului”. Aceasta este grani\u021ba final\u0103 dintre spa\u021biu \u0219i gaura neagr\u0103.<\/p>\n

\u00cen discul de culoare portocalie al g\u0103urii negre, acele linii vii arat\u0103 structura de r\u0103sucire a c\u00e2mpurilor magnetice din disc ca ni\u015fte gogo\u0219i. \u00cen cele din urm\u0103, aceste c\u00e2mpuri magnetice pot propulsa jeturi de materie din discul de gaz \u00eenvolburat al g\u0103urii negre. Prin imaginea luminii polarizate din gazul fierbinte str\u0103lucitor din apropierea g\u0103urilor negre, deducem direct structura \u0219i puterea c\u00e2mpurilor magnetice care conduc fluxul de gaz \u0219i materie pe care gaura neagr\u0103 se hr\u0103ne\u0219te \u0219i o ejecteaz\u0103.<\/p>\n

Noua cercetare a g\u0103urii negre a fost publicat\u0103 pe 27 martie \u00een jurnalul de \u0219tiin\u021b\u0103 „The Astrophysical Journal Letters”<\/strong><\/em>.<\/p>\n

\"\"<\/a><\/p>\n

Foarte important, astronomii au descoperit c\u0103 at\u00e2t S\u0103get\u0103torul A*, c\u00e2t \u0219i gaura neagr\u0103 din centrul galaxiei M87 \u2013 un obiect de 1.000 de ori mai masiv dec\u00e2t S\u0103get\u0103torul A* – sunt construite \u00een mod similar: ambele con\u021bin acela\u0219i tip de structuri magnetice \u00een discurile lor, chiar dac\u0103 exist\u0103 o diferen\u021b\u0103 uria\u0219\u0103 de dimensiune. Aceasta ar putea fi o caracteristic\u0103 comun\u0103 a majorit\u0103\u021bii g\u0103urilor negre – locuri \u00eenc\u0103 misterioase pentru noi, dar care treptat devin mai pu\u021bin opace.<\/p>\n

Pentru a captura imagini rare ale g\u0103urilor negre (au fost fotografiate doar aceste dou\u0103 g\u0103uri negre), oamenii de \u0219tiin\u021b\u0103 folosesc Telescopul Event Horizon (EHT), care este compus din telescoapele de pe tot P\u0103m\u00e2ntul. Lucr\u00e2nd \u00eempreun\u0103, ele creeaz\u0103 o matrice de dimensiunea unei planete. A\u0219tepta\u021bi-v\u0103 ca aceste imagini cu g\u0103uri negre s\u0103 devin\u0103 mai detaliate \u0219i mai impresionante \u00een urm\u0103torii ani, \u015fi asta pentru c\u0103 oamenii de \u0219tiin\u021b\u0103 adaug\u0103 mai multe telescoape la EHT.<\/p>\n

Sursa:<\/strong> articolul \u015ftiin\u0163ific „First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring” \/ iopscience.iop.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u00cen inima galaxiei noastre Calea Lactee se afl\u0103 un gigant. Este o gaur\u0103 neagr\u0103 masiv\u0103, numit\u0103 S\u0103get\u0103tor A* (pronun\u021bat „S\u0103get\u0103tor o stea”), c\u00e2nt\u0103rind p\u00e2n\u0103 la 4,3 milioane de sori. Dup\u0103 ce au f\u0103cut o imagine f\u0103r\u0103 precedent a obiectului \u00een … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":90072,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[102,1662,433,596,1367,952,345,150,18508,2364,18796,434],"class_list":["post-90069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astronomie","tag-camp-magnetic","tag-galaxie","tag-gaura-neagra","tag-gravitatie","tag-lumina","tag-materie","tag-nasa","tag-orizontul-evenimentelor","tag-revista","tag-sagetatorul-a","tag-telescop","resize-featured-image"],"yoast_head":"\nV\u0103 va uimi: o nou\u0103 imagine a g\u0103urii negre din centrul galaxiei noastre! 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