APEX’ iskolde ledsagere
Atacama Pathfinder Experiment (APAX) teleskopet – fanget på dette dramatiske billede taget af ESOs fotoambassadørerBabak Tafreshi – er et af de redskaber, der bruges af ESO til at studere universet i andet end synligt lys. Det er placeret på Chajnantor-højsletten i en højde af 5000 meter.
Klynger af hvide isspidser kan ses i forgrunden af billedet. Isspidserne (”penitentes” på spansk) er et forunderligt naturfænomen, der findes i højtliggende områder, typisk mere end 4000 meter over havets overflade. De er tynde pigge af hærdet sne eller is med deres spidser pegende mod Solen, kan være alt fra et par centimeter i højden og op til flere meter.
APEX er et 12 meter teleskop, der observerer lys ved millimeter og submillimeter bølgelængder. Astronomer, der observerer med APEX, kan se fænomener, der er usynlige ved kortere bølgelængder. Teleskopet giver dem bl.a. mulighed for at studere molekyleskyer, der er tætte områder af gas og kosmisk støv, hvor nye stjerner bliver født. Disse skyer er mørke og skjult af støv i synligt og infrarødt lys, men gløder klart ved disse forholdsvis lange bølgelængder. Astronomer bruger denne glød til at studere de kemiske og fysiske forhold i skyerne. Dette bølgelængdeområde er også ideelt til at studere nogle af de tidligste og fjerneste galakser i universet.
På nattehimlen over og til venstre for APEX ses henholdsvis den Lille og Store Magellanske Sky som svage lyspletter. De er nabogalakser til vores egen galakse, Mælkevejen. Selve Mælkevejen ses som et diset bånd tværs over himlen, mest tydeligt over APEX’ kontrolbygning til højre. Mørke pletter i båndet er områder, hvor lyset fra fjerne stjerner er blokeret af interstellart støv. Skjult bag disse mørke støvbånd er Mælkevejens centrum i en afstand på ca. 27.000 lysår. Teleskoper som APEX er afgørende redskaber for astronomerne for at kunne se gennem støvet og studere vores galakses centrum i detaljer.
APEX er et samarbejde mellem Max-Planck-Institut für Radioastronomie (MPIfR), Onsala Space Observatory (OSO) og ESO. Driften af APEX på Chajnantor varetages af ESO.
Links
Kilde:ESO/B. Tafreshi (twanight.org)
Om billedet
| Id: | potw1247a |
| Sprog: | da |
| Type: | Foto |
| Udgivelsesdato: | 19. november 2012 10:00 |
| Størrelse: | 6124 x 4096 px |
Om objektet
| Navn: | Atacama Pathfinder Experiment |
| Type: | Unspecified : Technology : Observatory |
Billedformater
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