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Temna snov: raziskave nevidnega v dveh kozmoloških superpospeševalnikih, "Izstrelek" lE0657- 56 in MCSJ0025.4-1222Bradač, MarušaJata galaksij lE0657-56 je ena izmed najbolj raziskanih jat galaksij. Na prvi pogled je bila to čisto navadna jata galaksij, sestavljena iz galaksij, vročega plina in, kot so astronomi ugotovili za ... jato Coma že leta 1933, tudi iz temne snovi. Nova opazovanja z vesoljskima teleskopoma Chandra in Hubble pa so odkrila, da vidimo dve ogromni jati galaksij, ki sta trčili pred približno ▫$10^8$▫ leti. Gost oblak plina ima po trku obliko naboja, po kateri je jata dobila ime Izstrelek (v angleščini "Bullet Cluster"). Prav s to jato smo lahko astronomi prvič tudi izmerili lastnosti temne snovi. Trk jat je povzročil, da se je plin, ki ima velik sipalni presek (se obnaša kot plazma) upočasnil. Galaksije, ki zavzemajo majhen volumen, pa med sabo ne interagirajo, zato skoraj nemoteno preživijo takšen trk. Temna snov se prav tako ni upočasnila. Ker je difuzno porazdeljena, smo ugotovili, da reagira drugače kot navadna snov in ima majhen ali ničelni sipalni presek za sipanje na temni snovi in tudi na navadni snovi. To pa ni edina jata galaksij, s katero raziskujemo lastnosti temne snovi. Jata MACS J0025.4-1222 je prav tako posledica trka dveh jat galaksij, s katero smo potrdili rezultate o obstoju in majhnem sipalnem preseku temne snovi.Source: Obzornik za matematiko in fiziko. - ISSN 0473-7466 (Letn. 56, št. 6, 2009, str. 207-213)Type of material - article, component partPublish date - 2009Language - slovenianCOBISS.SI-ID - 15473241
Author
Bradač, Maruša
Topics
astronomija |
astrofizika |
jata galaksij |
temna snov |
astronomy |
astrophysics |
cluster of galaxies |
dark matter
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Bradač, Maruša | 55257 |
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