{"id":33882,"date":"2024-08-22T10:48:25","date_gmt":"2024-08-22T03:48:25","guid":{"rendered":"https:\/\/chanhkien.org\/?p=33882"},"modified":"2025-05-12T10:17:39","modified_gmt":"2025-05-12T03:17:39","slug":"xuat-hien-chom-sao-tre-xung-quanh-ho-den-o-trung-tam-dai-ngan-ha","status":"publish","type":"post","link":"https:\/\/chanhkien.org\/2024\/08\/xuat-hien-chom-sao-tre-xung-quanh-ho-den-o-trung-tam-dai-ngan-ha.html","title":{"rendered":"Xu\u1ea5t hi\u1ec7n ch\u00f2m sao tr\u1ebb xung quanh h\u1ed1 \u0111en \u1edf trung t\u00e2m D\u1ea3i Ng\u00e2n H\u00e0"},"content":{"rendered":"

[ChanhKien.org]<\/b><\/p>\n

G\u1ea7n \u0111\u00e2y, trang tin t\u1ee9c artstechnica.com \u0111\u01b0a tin, c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc \u0111\u00e3 ph\u00e1t hi\u1ec7n m\u1ed9t ch\u00f2m sao tr\u1ebb xung quanh h\u1ed1 \u0111en \u1edf trung t\u00e2m D\u1ea3i Ng\u00e2n H\u00e0, v\u00e0 ch\u00fang tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t chi\u1ebfc v\u00f2ng c\u1ed5 kim c\u01b0\u01a1ng bao l\u1ea5y si\u00eau h\u1ed1 \u0111en n\u00e0y.<\/p>\n

Th\u00f4ng th\u01b0\u1eddng, khi c\u00e1c \u0111\u00e1m kh\u00ed b\u1ee5i c\u00e1ch h\u1ed1 \u0111en m\u1ed9t c\u1ef1 ly g\u1ea7n, ch\u00fang d\u1ec5 b\u1ecb ph\u00e1 h\u1ee7y v\u00e0 b\u1ecb cu\u1ed1n v\u00e0o trong. Tuy nhi\u00ean, c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc l\u1ea1i ph\u00e1t hi\u1ec7n m\u1ed9t s\u1ed1 \u0111\u00e1m kh\u00ed b\u1ee5i k\u1ef3 l\u1ea1 c\u00f3 th\u1ec3 l\u01b0u chuy\u1ec3n \u1ed5n \u0111\u1ecbnh trong th\u1eddi gian d\u00e0i b\u00ean r\u00eca c\u1ee7a h\u1ed1 \u0111en kh\u1ed5ng l\u1ed3 Sagittarius A* (Nh\u00e2n M\u00e3 A*). M\u1ed9t nh\u00f3m nghi\u00ean c\u1ee9u qu\u1ed1c t\u1ebf do nh\u00e0 v\u1eadt l\u00fd thi\u00ean v\u0103n Florian Pei\u00dfker thu\u1ed9c \u0110\u1ea1i h\u1ecdc Cologne d\u1eabn \u0111\u1ea7u \u0111\u00e3 ph\u00e2n t\u00edch nh\u1eefng \u0111\u00e1m kh\u00ed b\u1ee5i n\u00e0y. K\u1ebft qu\u1ea3 cho th\u1ea5y, c\u00e1c ng\u00f4i sao tr\u1ebb (Young Stellar Object, YSO) c\u00f3 th\u1ec3 \u1ea9n n\u00e1u trong nh\u1eefng \u0111\u00e1m kh\u00ed b\u1ee5i n\u00e0y. \u0110i\u1ec1u k\u1ef3 l\u1ea1 h\u01a1n n\u1eefa l\u00e0 nh\u1eefng ng\u00f4i sao m\u1edbi xu\u1ea5t hi\u1ec7n n\u00e0y tr\u1ebb v\u00e0 s\u00e1ng h\u01a1n qu\u1ea7n th\u1ec3 ng\u00f4i sao tr\u1ebb quay quanh Sagittarius A*\uff08\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 sao S\uff09\u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n

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

Vi\u1ec7c t\u00ecm th\u1ea5y hai ch\u00f2m sao quay quanh g\u1ea7n nhau nh\u01b0 v\u1eady l\u00e0 \u0111i\u1ec1u r\u1ea5t k\u1ef3 l\u1ea1, b\u1edfi th\u00f4ng th\u01b0\u1eddng c\u00e1c ng\u00f4i sao quay quanh h\u1ed1 \u0111en si\u00eau l\u1edbn s\u1ebd t\u1ed1i v\u00e0 gi\u00e0 h\u01a1n. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 x\u00e1c \u0111\u1ecbnh t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a YSO d\u1ef1a tr\u00ean c\u00e1c photon b\u1ee9c x\u1ea1 m\u00e0 ch\u00fang ph\u00e1t ra, \u0111\u1ed3ng th\u1eddi cho th\u1ea5y b\u1ee9c x\u1ea1 trung v\u00e0 c\u1eadn h\u1ed3ng ngo\u1ea1i c\u1ee7a ch\u00fang ph\u00f9 h\u1ee3p v\u1edbi b\u1ee9c x\u1ea1 c\u1ee7a c\u00e1c ng\u00f4i sao. H\u1ecd l\u1ea5y G2\/DSO, m\u1ed9t trong nh\u1eefng v\u1eadt th\u1ec3, l\u00e0m v\u00ed d\u1ee5, v\u00ec v\u1eadt th\u1ec3 n\u00e0y c\u00f3 \u0111\u1ed9 s\u00e1ng cao v\u00e0 b\u1ee9c x\u1ea1 \u0111\u1eb7c bi\u1ec7t m\u1ea1nh v\u00e0 l\u00e0 v\u1eadt th\u1ec3 d\u1ec5 nghi\u00ean c\u1ee9u nh\u1ea5t. Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a n\u00f3 c\u0169ng t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a c\u00e1c ng\u00f4i sao c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng th\u1ea5p \u0111\u00e3 bi\u1ebft.<\/p>\n

YSO l\u00e0 ng\u00f4i sao c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng th\u1ea5p \u0111\u00e3 v\u01b0\u1ee3t kh\u1ecfi giai \u0111o\u1ea1n ti\u1ec1n sao (protostar), nh\u01b0ng ch\u01b0a ph\u00e1t tri\u1ec3n th\u00e0nh nh\u1eefng ng\u00f4i sao thu\u1ed9c d\u00e3y ch\u00ednh – nh\u1eefng ng\u00f4i sao m\u00e0 l\u00f5i c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 t\u1ed5ng h\u1ee3p hydro th\u00e0nh heli. L\u00fd do nh\u1eefng thi\u00ean th\u1ec3 m\u1edbi ph\u00e1t hi\u1ec7n n\u00e0y \u0111\u01b0\u1ee3c cho l\u00e0 YSO, l\u00e0 v\u00ec ch\u00fang kh\u00f3 c\u00f3 th\u1ec3 l\u00e0 nh\u1eefng kh\u1ed1i kh\u00ed v\u00e0 b\u1ee5i trong v\u0169 tr\u1ee5, \u0111\u1ed3ng th\u1eddi c\u00e1c \u0111\u00e1m m\u00e2y kh\u00ed kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i \u1edf g\u1ea7n m\u1ed9t si\u00eau h\u1ed1 \u0111en trong th\u1eddi gian d\u00e0i. S\u1ee9c n\u00f3ng cao \u0111\u1ed9 c\u1ee7a n\u00f3 khi\u1ebfn kh\u00ed v\u00e0 b\u1ee5i b\u1ed1c h\u01a1i nhanh ch\u00f3ng, khi\u1ebfn c\u00e1c h\u1ea1t l\u1ea1p t\u1eed b\u1ecb k\u00edch th\u00edch b\u1edfi nhi\u1ec7t s\u1ebd va ch\u1ea1m v\u1edbi nhau v\u00e0 bay v\u00e0o v\u0169 tr\u1ee5.<\/p>\n

Nh\u00f3m nghi\u00ean c\u1ee9u \u01b0\u1edbc t\u00ednh r\u1eb1ng m\u1ed9t \u0111\u00e1m m\u00e2y c\u00f3 k\u00edch th\u01b0\u1edbc t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi G2\/DSO s\u1ebd b\u1ed1c h\u01a1i trong v\u00f2ng b\u1ea3y n\u0103m. Tuy nhi\u00ean, m\u1ed9t ng\u00f4i sao quay quanh \u1edf c\u00f9ng kho\u1ea3ng c\u00e1ch v\u1edbi h\u1ed1 \u0111en si\u00eau l\u1edbn s\u1ebd kh\u00f4ng b\u1ecb ph\u00e1 h\u1ee7y nhanh nh\u01b0 v\u1eady v\u00ec m\u1eadt \u0111\u1ed9 v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a n\u00f3 cao h\u01a1n nhi\u1ec1u.<\/p>\n

M\u1eb7c d\u00f9 h\u1ea7u h\u1ebft c\u00e1c ng\u00f4i sao \u0111\u1ec1u \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh trong c\u00e1c h\u1ec7 sao \u0111\u00f4i, nh\u01b0ng YSO kh\u00f4ng th\u1ec3 l\u00e0 sao \u0111\u00f4i. Nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 s\u1ef1 nhi\u1ec5u lo\u1ea1n c\u1ee7a Sagittarius A*c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1c ng\u00f4i sao t\u1eebng l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 sao \u0111\u00f4i di chuy\u1ec3n t\u1edbi.<\/p>\n

Quan s\u00e1t s\u00e2u h\u01a1n cho th\u1ea5y m\u1ed9t s\u1ed1 v\u1eadt th\u1ec3 b\u1ecb b\u1ee5i b\u1eb7m che khu\u1ea5t l\u00e0 nh\u1eefng ng\u00f4i sao m\u1edbi sinh, nh\u01b0ng c\u0169ng c\u00f3 \u00fd ki\u1ebfn cho r\u1eb1ng \u0111\u00f3 l\u00e0 m\u1ed9t lo\u1ea1i sao n\u00e0o \u0111\u00f3 ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng.<\/p>\n

Hi\u1ec7n v\u1eabn ch\u01b0a r\u00f5 nh\u1eefng v\u1eadt th\u1ec3 b\u1ee5i b\u1eb7m n\u00e0y \u0111\u1ebfn t\u1eeb \u0111\u00e2u v\u00e0 h\u00ecnh th\u00e0nh nh\u01b0 th\u1ebf n\u00e0o. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u cho r\u1eb1ng nh\u1eefng v\u1eadt th\u1ec3 n\u00e0y \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh t\u1eeb ph\u00e2n t\u1eed trong m\u1ed9t \u0111\u00e1m m\u00e2y r\u01a1i v\u1ec1 ph\u00eda trung t\u00e2m D\u1ea3i Ng\u00e2n H\u00e0. H\u1ecd c\u0169ng cho r\u1eb1ng d\u00f9 n\u00f3 \u0111\u01b0\u1ee3c sinh ra \u1edf \u0111\u00e2u, n\u00f3 c\u0169ng s\u1ebd di chuy\u1ec3n v\u1ec1 ph\u00eda Sagittarius A*, v\u00e0 c\u00e1c v\u1eadt th\u1ec3 trong b\u1ea5t k\u1ef3 h\u1ec7 sao \u0111\u00f4i n\u00e0o c\u0169ng s\u1ebd b\u1ecb ng\u0103n c\u00e1ch b\u1edfi l\u1ef1c h\u1ea5p d\u1eabn c\u1ef1c l\u1edbn c\u1ee7a h\u1ed1 \u0111en.<\/p>\n

M\u1eb7c d\u00f9 YSO v\u00e0 YSO ti\u1ec1m n\u0103ng kh\u00f4ng c\u00f9ng ngu\u1ed3n g\u1ed1c t\u1eeb m\u1ed9t tinh \u0111o\u00e0n g\u1ed3m c\u00e1c sao lo\u1ea1i S gi\u00e0 h\u01a1n m\u1ed9t ch\u00fat, nh\u01b0ng ch\u00fang v\u1eabn li\u00ean quan v\u1edbi nhau theo m\u1ed9t c\u00e1ch n\u00e0o \u0111\u00f3. C\u00f3 th\u1ec3 ch\u00fang \u0111\u00e3 tr\u1ea3i qua nh\u1eefng h\u00e0nh tr\u00ecnh h\u00ecnh th\u00e0nh di chuy\u1ec3n t\u01b0\u01a1ng t\u1ef1 nhau, v\u00e0 nh\u1eefng ng\u00f4i sao tr\u1ebb h\u01a1n cu\u1ed1i c\u00f9ng c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn giai \u0111o\u1ea1n \u0111\u00f3.<\/p>\n

Trong c\u00f9ng m\u1ed9t nghi\u00ean c\u1ee9u, nh\u00f3m c\u1ee7a \u00f4ng Florian Pei\u00dfker cho bi\u1ebft: \u201cTheo suy \u0111o\u00e1n, c\u00f3 l\u1ebd nh\u1eefng ngu\u1ed3n b\u1ee5i b\u1eb7m n\u00e0y s\u1ebd ph\u00e1t tri\u1ec3n th\u00e0nh c\u00e1c sao lo\u1ea1i S c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng th\u1ea5p\u201d.<\/p>\n

D\u1ecbch t\u1eeb: https:\/\/www.zhengjian.org\/node\/291558<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

[ChanhKien.org] G\u1ea7n \u0111\u00e2y, trang tin t\u1ee9c artstechnica.com \u0111\u01b0a tin, c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc \u0111\u00e3 ph\u00e1t hi\u1ec7n m\u1ed9t ch\u00f2m sao tr\u1ebb xung quanh h\u1ed1 \u0111en \u1edf trung t\u00e2m D\u1ea3i Ng\u00e2n H\u00e0, v\u00e0 ch\u00fang tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t chi\u1ebfc v\u00f2ng c\u1ed5 kim c\u01b0\u01a1ng bao l\u1ea5y si\u00eau h\u1ed1 \u0111en n\u00e0y. 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