{"id":1450,"date":"2009-03-07T19:28:10","date_gmt":"2009-03-07T19:28:10","guid":{"rendered":"https:\/\/chanhkien.org\/?p=1450"},"modified":"2012-05-25T09:29:23","modified_gmt":"2012-05-25T09:29:23","slug":"phan-vat-chat-vu-tru-con-thieu-da-duoc-tim-ra-boi-dai-quan-sat-tia-x-xmm-newton","status":"publish","type":"post","link":"https:\/\/chanhkien.org\/2009\/03\/phan-vat-chat-vu-tru-con-thieu-da-duoc-tim-ra-boi-dai-quan-sat-tia-x-xmm-newton.html","title":{"rendered":"Ph\u1ea7n v\u1eadt ch\u1ea5t v\u0169 tr\u1ee5 c\u00f2n thi\u1ebfu \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm ra b\u1edfi \u0111\u00e0i quan s\u00e1t tia-X XMM-Newton"},"content":{"rendered":"

[Chanhkien.org]<\/strong> \u0110\u00e0i quan s\u00e1t tia-X XMM-Newton tr\u1ef1c thu\u1ed9c C\u01a1 quan H\u00e0ng kh\u00f4ng V\u0169 tr\u1ee5 Ch\u00e2u \u00c2u d\u01b0\u1edbi s\u1ef1 \u0111i\u1ec3u khi\u1ec3n c\u1ee7a m\u1ed9t nh\u00f3m c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc qu\u1ed1c t\u1ebf cu\u1ed1i c\u00f9ng \u0111\u00e3 kh\u00e1m ph\u00e1 ra ph\u1ea7n v\u1eadt ch\u1ea5t c\u00f2n thi\u1ebfu trong v\u0169 tr\u1ee5.<\/p>\n

M\u01b0\u1eddi n\u0103m tr\u01b0\u1edbc, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 d\u1ef1 \u0111o\u00e1n r\u1eb1ng kho\u1ea3ng m\u1ed9t n\u1eeda v\u1eadt ch\u1ea5t th\u00f4ng th\u01b0\u1eddng l\u00e0 \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o b\u1edfi nh\u1eefng nguy\u00ean t\u1eed t\u1ed3n t\u1ea1i d\u01b0\u1edbi h\u00ecnh th\u1ee9c c\u00e1c \u0111\u00e1m kh\u00ed b\u1ee5i c\u00f3 m\u1eadt \u0111\u1ed9 th\u1ea5p, tr\u00e0n \u0111\u1ea7y trong v\u0169 tr\u1ee5 r\u1ed9ng l\u1edbn v\u00e0 gi\u1eefa c\u00e1c thi\u00ean h\u00e0.<\/p>\n

T\u1ea5t c\u1ea3 v\u1eadt ch\u1ea5t trong v\u0169 tr\u1ee5 \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 gi\u1ed1ng nh\u01b0 m\u1ed9t c\u1ea5u tr\u00fac m\u1ea1ng nh\u1ec7n, g\u1ecdi l\u00e0 l\u01b0\u1edbi v\u0169 tr\u1ee5 (cosmic web). T\u1ea1i nh\u1eefng \u0111i\u1ec3m n\u00fat \u0111\u1eadm \u0111\u1eb7c nh\u1ea5t c\u1ee7a l\u01b0\u1edbi v\u0169 tr\u1ee5 l\u00e0 c\u00e1c d\u1ea3i thi\u00ean h\u00e0 – v\u1eadt th\u1ec3 l\u1edbn nh\u1ea5t trong v\u0169 tr\u1ee5. C\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc ho\u00e0i nghi r\u1eb1ng nh\u1eefng \u0111\u00e1m kh\u00ed b\u1ee5i m\u1eadt \u0111\u1ed9 th\u1ea5p lan tr\u00e0n kh\u1eafp trong nh\u1eefng \u201cs\u1ee3i d\u00e2y\u201d c\u1ee7a chi\u1ebfc l\u01b0\u1edbi v\u0169 tr\u1ee5 n\u00e0y.<\/p>\n

M\u1eadt \u0111\u1ed9 th\u1ea5p c\u1ee7a \u0111\u00e1m kh\u00ed b\u1ee5i \u0111\u00e3 ng\u0103n c\u1ea3n nhi\u1ec1u c\u1ed1 g\u1eafng nh\u1eb1m ph\u00e1t hi\u1ec7n ra n\u00f3 trong qu\u00e1 kh\u1ee9. V\u1edbi \u0111\u1ed9 nh\u1ea1y cao c\u1ee7a \u0111\u00e0i quan s\u00e1t XMM-Newton, c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc \u0111\u00e3 kh\u00e1m ph\u00e1 ra nh\u1eefng ph\u1ea7n \u0111\u1eadm \u0111\u1eb7c nh\u1ea5t c\u1ee7a n\u00f3. Kh\u00e1m ph\u00e1 n\u00e0y s\u1ebd gi\u00fap h\u1ecd hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 gi\u00e3n n\u1edf c\u1ee7a l\u01b0\u1edbi v\u0169 tr\u1ee5.<\/p>\n

\"\"<\/p>\n

Ph\u1ee9c h\u1ee3p quang h\u1ecdc v\u00e0 h\u00ecnh \u1ea3nh tia-X c\u1ee7a d\u1ea3i thi\u00ean h\u00e0 Abell 222 v\u00e0 Abell 223. D\u1ea3i thi\u00ean h\u00e0 \u0111\u00f4i n\u00e0y \u0111\u01b0\u1ee3c n\u1ed1i li\u1ec1n b\u1edfi m\u1ed9t s\u1ee3i nh\u1ecf th\u1ea5m \u0111\u1ea7y b\u1edfi \u0111\u00e1m kh\u00ed t\u1ecfa ra tia-X m\u1eadt \u0111\u1ed9 cao.
\n<\/em>H\u00ecnh \u1ea3nh quang h\u1ecdc \u0111\u01b0\u1ee3c ch\u1ee5p b\u1edfi SuprimeCam c\u1ee7a k\u00ednh vi\u1ec5n v\u1ecdng Subaru; h\u00ecnh \u1ea3nh tia-X cho th\u1ea5y s\u1ef1 ph\u00e2n b\u1ed5 c\u1ee7a nh\u1eefng \u0111\u00e1m kh\u00ed khu\u1ebfch t\u00e1n (t\u1eeb v\u00e0ng sang \u0111\u1ecf) \u0111\u01b0\u1ee3c quan s\u00e1t b\u1edfi XMM-Newton. Ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n: ESA\/ XMM-Newton\/ EPIC\/ ESO (J. Dietrich)\/ SRON (N. Werner)\/ MPE (A. Finoguenov).
\n<\/em><\/p>\n

Ch\u1ec9 kho\u1ea3ng 5% v\u0169 tr\u1ee5 c\u1ee7a ch\u00fang ta \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o b\u1edfi v\u1eadt ch\u1ea5t th\u00f4ng th\u01b0\u1eddng m\u00e0 ch\u00fang ta \u0111\u00e3 bi\u1ebft, bao g\u1ed3m proton, neutron ho\u1eb7c baryon, c\u00f9ng v\u1edbi electron, h\u00ecnh th\u00e0nh n\u00ean nh\u1eefng kh\u1ed1i v\u1eadt ch\u1ea5t th\u00f4ng th\u01b0\u1eddng. Ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a v\u0169 tr\u1ee5 \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o b\u1edfi v\u1eadt ch\u1ea5t t\u1ed1i (23%) v\u00e0 n\u0103ng l\u01b0\u1ee3ng t\u1ed1i (72%). M\u1ed9t n\u1eeda c\u1ee7a c\u00e1c v\u1eadt ch\u1ea5t baryon th\u00ec ch\u01b0a \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n. T\u1ea5t c\u1ea3 c\u00e1c ng\u00f4i sao, thi\u00ean h\u00e0 v\u00e0 c\u00e1c \u0111\u00e1m kh\u00ed b\u1ee5i quan s\u00e1t \u0111\u01b0\u1ee3c trong v\u0169 tr\u1ee5 ch\u1ec9 c\u00f3 \u00edt h\u01a1n 1 n\u1eeda v\u1eadt ch\u1ea5t \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o b\u1edfi baryon.<\/p>\n

C\u00e1c nh\u00e0 khoa h\u1ecdc d\u1ef1 \u0111o\u00e1n r\u1eb1ng nh\u1eefng \u0111\u00e1m kh\u00ed ph\u1ea3i c\u00f3 m\u1ed9t nhi\u1ec7t \u0111\u1ed9 r\u1ea5t cao v\u00e0 n\u00f3 c\u00f3 th\u1ec3 ph\u00f3ng x\u1ea1 tia-X n\u0103ng l\u01b0\u1ee3ng th\u1ea5p. Nh\u01b0ng m\u1eadt \u0111\u1ed9 th\u1ea5p c\u1ee7a ch\u00fang l\u00e0m cho vi\u1ec7c quan s\u00e1t tr\u1edf n\u00ean kh\u00f3 kh\u0103n.<\/p>\n

C\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc \u0111\u00e3 s\u1eed d\u1ee5ng XMM-Newton \u0111\u1ec3 quan s\u00e1t m\u1ed9t c\u1eb7p thi\u00ean h\u00e0, Abell 222 v\u00e0 Abell 223, c\u00e1ch tr\u00e1i \u0111\u1ea5t 2.300 tri\u1ec7u n\u0103m \u00e1nh s\u00e1ng. Khi \u1ea5y, nh\u1eefng h\u00ecnh \u1ea3nh v\u00e0 quang ph\u1ed5 c\u1ee7a h\u1ec7 th\u1ed1ng cho th\u1ea5y m\u1ed9t chi\u1ebfc \u201cc\u1ea7u n\u1ed1i\u201d b\u1eb1ng kh\u00ed n\u00f3ng li\u00ean k\u1ebft hai ch\u00f2m sao.<\/p>\n

\u201c\u0110\u00e1m kh\u00ed n\u00f3ng m\u00e0 ch\u00fang ta th\u1ea5y trong \u2018chi\u1ebfc c\u1ea7u\u2019 hay l\u00e0 nh\u1eefng \u2018s\u1ee3i d\u00e2y\u2019 c\u00f3 th\u1ec3 c\u1ef1c n\u00f3ng v\u00e0 c\u00f3 m\u1eadt \u0111\u1ed9 cao nh\u1ea5t c\u1ee7a \u0111\u00e1m kh\u00ed khu\u1ebfch t\u00e1n trong l\u01b0\u1edbi v\u0169 tr\u1ee5, \u0111\u01b0\u1ee3c tin l\u00e0 c\u1ea5u t\u1ea1o b\u1edfi m\u1ed9t n\u1eeda v\u1eadt ch\u1ea5t baryon trong v\u0169 tr\u1ee5,\u201d \u00f4ng Norbert Werner \u0111\u1ebfn t\u1eeb H\u1ecdc vi\u1ec7n nghi\u00ean c\u1ee9u v\u0169 tr\u1ee5 H\u00e0 Lan SRON, tr\u01b0\u1edfng nh\u00f3m nghi\u00ean c\u1ee9u cho bi\u1ebft.<\/p>\n

\"\"<\/p>\n

\u0110\u00e2y l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh c\u1ee7a l\u01b0\u1edbi v\u0169 tr\u1ee5. C\u00e1c ch\u00f2m sao \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n l\u00e0 s\u1ebd ph\u00e1t tri\u1ec3n \u1edf c\u00e1c v\u00f9ng n\u1ed1i c\u1ee7a t\u1ea5m l\u01b0\u1edbi. Ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n: Springel et al., Virgo Consortium
\n<\/em><\/p>\n

\u201cKh\u00e1m ph\u00e1 v\u1ec1 ph\u1ea7n n\u00f3ng nh\u1ea5t c\u1ee7a c\u00e1c baryon b\u1ecb thi\u1ebfu l\u00e0 r\u1ea5t quan tr\u1ecdng. \u0110\u00f3 l\u00e0 b\u1edfi v\u00ec c\u00f3 nhi\u1ec1u lo\u1ea1i [v\u1eadt ch\u1ea5t] kh\u00e1c nhau c\u00f9ng t\u1ed3n t\u1ea1i v\u00e0 ch\u00fang ta d\u1ef1 \u0111o\u00e1n l\u00e0 nh\u1eefng baryon b\u1ecb thi\u1ebfu l\u00e0 m\u1ed9t lo\u1ea1i kh\u00ed n\u00f3ng, nh\u01b0ng m\u1eabu n\u00e0y c\u00f3 xu h\u01b0\u1edbng kh\u00e1c bi\u1ec7t h\u1eb3n,\u201d \u00f4ng Alexis Finoguenov, m\u1ed9t th\u00e0nh vi\u00ean c\u1ee7a nh\u00f3m nghi\u00ean c\u1ee9u cho bi\u1ebft th\u00eam.<\/p>\n

Th\u1eadm ch\u00ed v\u1edbi \u0111\u1ed9 nh\u1ea1y c\u1ee7a XMM-Newton, kh\u00e1m ph\u00e1 n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 x\u1ea3y ra b\u1edfi v\u00ec ph\u1ea7n n\u1ed1i l\u00e0 d\u1ecdc theo \u0111\u01b0\u1eddng th\u1eb3ng c\u1ee7a t\u1ea7m nh\u00ecn, t\u1eadp trung s\u1ef1 b\u1ee9c x\u1ea1 t\u1eeb to\u00e0n \u0111i\u1ec3m n\u1ed1i ch\u1ec9 trong m\u1ed9t v\u00f9ng nh\u1ecf tr\u00ean b\u1ea7u tr\u1eddi. Kh\u00e1m ph\u00e1 v\u1ec1 kh\u00ed n\u00f3ng n\u00e0y s\u1ebd gi\u00fap ch\u00fang ta hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 s\u1ef1 gi\u00e3n n\u1edf c\u1ee7a l\u01b0\u1edbi v\u0169 tr\u1ee5.<\/p>\n

\u201c\u0110\u00e2y m\u1edbi ch\u1ec9 l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u. \u0110\u1ec3 hi\u1ec3u v\u1ec1 s\u1ef1 ph\u00e2n b\u1ed1 c\u1ee7a v\u1eadt ch\u1ea5t trong l\u01b0\u1edbi v\u0169 tr\u1ee5, ch\u00fang ta ph\u1ea3i nghi\u00ean c\u1ee9u th\u00eam nhi\u1ec1u h\u1ec7 th\u1ed1ng gi\u1ed1ng nh\u01b0 th\u1ebf n\u00e0y. V\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 khai tr\u01b0\u01a1ng m\u1ed9t \u0111\u00e0i quan s\u00e1t v\u0169 tr\u1ee5 m\u1edbi chuy\u00ean d\u1ee5ng \u0111\u1ec3 quan s\u00e1t l\u01b0\u1edbi v\u0169 tr\u1ee5 v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n hi\u1ec7n nay. K\u1ebft qu\u1ea3 s\u1ebd cho ph\u00e9p ch\u00fang ta thi\u1ebft l\u1eadp nh\u1eefng y\u00eau c\u1ea7u ch\u1eafc ch\u1eafn cho nhi\u1ec7m v\u1ee5 m\u1edbi n\u00e0y,\u201d \u00f4ng Norbert Werner k\u1ebft lu\u1eadn.<\/p>\n

Nh\u00e0 khoa h\u1ecdc ph\u1ee5 tr\u00e1ch d\u1ef1 \u00e1n ESA’s XMM-Newton, \u00f4ng Norbert Schartel, b\u00ecnh lu\u1eadn v\u1ec1 kh\u00e1m ph\u00e1 n\u00e0y: \u201c\u0110\u1ed9t ph\u00e1 quan tr\u1ecdng n\u00e0y l\u00e0 m\u1ed9t tin tuy\u1ec7t v\u1eddi cho s\u1ee9 m\u1ec7nh c\u1ee7a ch\u00fang ta. \u0110\u00e1m kh\u00ed \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n sau nh\u1eefng c\u1ed1 g\u1eafng l\u1edbn lao v\u00e0 quan tr\u1ecdng h\u01a1n, ch\u00fang ta \u0111\u00e3 bi\u1ebft ph\u1ea3i t\u00ecm ki\u1ebfm \u1edf n\u01a1i n\u00e0o. T\u00f4i hy v\u1ecdng nhi\u1ec1u nghi\u00ean c\u1ee9u theo sau XMM-Newton trong t\u01b0\u01a1ng lai s\u1ebd nh\u1eb1m \u0111\u00fang nh\u1eefng khu v\u1ef1c \u0111\u1ea7y h\u1ee9a h\u1eb9n tr\u00ean b\u1ea7u tr\u1eddi.\u201d<\/p>\n

D\u1ecbch t\u1eeb:<\/p>\n

http:\/\/www.esa.int\/esaCP\/SEMQLPZXUFF_index_0.html<\/a>
\nhttp:\/\/www.pureinsight.org\/node\/5353<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u0110\u00e0i quan s\u00e1t tia-X XMM-Newton tr\u1ef1c thu\u1ed9c C\u01a1 quan H\u00e0ng kh\u00f4ng V\u0169 tr\u1ee5 Ch\u00e2u \u00c2u d\u01b0\u1edbi s\u1ef1 \u0111i\u1ec3u khi\u1ec3n c\u1ee7a m\u1ed9t nh\u00f3m c\u00e1c nh\u00e0 thi\u00ean v\u0103n h\u1ecdc qu\u1ed1c t\u1ebf cu\u1ed1i c\u00f9ng \u0111\u00e3 kh\u00e1m ph\u00e1 ra ph\u1ea7n v\u1eadt ch\u1ea5t c\u00f2n thi\u1ebfu trong v\u0169 tr\u1ee5.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[84],"tags":[48],"class_list":["post-1450","post","type-post","status-publish","format-standard","hentry","category-vu-tru-hoc","tag-khoa-hoc-vu-tru"],"acf":[],"yoast_head":"\nPh\u1ea7n v\u1eadt ch\u1ea5t v\u0169 tr\u1ee5 c\u00f2n thi\u1ebfu \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm ra b\u1edfi \u0111\u00e0i quan s\u00e1t tia-X XMM-Newton - 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