VLT observerer antennegalaksen
Et nyt Very Large Telescope (VLT) billede af Antennegalaksen giver os hvad, der kan være det næstbedste billede i synligt lys der endnu er taget, af dette slående par kolliderende galakser med dramatisk forvrængede former.
Dette fantastiske objekt har sit navn fra de lange antennelignende "arme", der strækker sig langt ud fra kernerne i de to galakser, bedst set i vidvinkelbilleder fra jordbaserede teleskoper som på dette link.
Dette VLT-billede fokuserer i stedet på galaksernes kerner, hvor tingene virkelig foregår. De to galakser fusionerer ind til en enkelt gigantisk galakse.
Drevet af chokbølger forårsaget af deres kamp mod hinandens tyngdekraft, er de to galakser blevet fyldt af strålende blå, varme, unge stjerner i stjernedannende regioner omgivet af glødende hydrogengas, vist her i lyserødt.
De to lyse gule klumper er kernerne i de oprindelige galakser, som skinner ved lyset af gamle stjerner, hvor enkelte ses gennem tynde skyer af støv.
Antennegalaksen blev udødeliggjort i 2006 af et af NASA/ESA Rumteleskopets mest kendte billeder (sammensat af ESAs Hubble gruppe under ESO).
Hvis du er sulten efter mere information om dette fantastiske objekt, skal du læse ESO-pressemeddelelsen om det første billede fra ALMA, Atacama Large Millimeter / submillimeter Array, som lige har startet sine tidlige videnskabelige observationer.
ALMA, konstrueret af ESO og dets internationale partnere, observerer universet i lys med millimeter og submillimetre bølgelængder - radikalt forskellig fra synlige lys og infrarøde teleskoper.
ALMA-billedet er det bedste submillimeter-bølgelængdebillede, der nogensinde er taget af Antennegalaksen, på trods af at det bare er en forsmag på, hvad ALMA vil levere i fremtiden.
ALMA-billedet blev lavet ved hjælp af testdata fra kun tolv antenner, og efterhånden som observatoriet vokser, vil skarpheden, effektiviteten og kvaliteten af dets observationer stige dramatisk.
Dette billede blev behandlet af ESO ved hjælp af observationsdataene fundet af Alberto Milani (Italien), som sendte det til ESOs "Your ESO Pictures" Flickr-gruppen.
ESO/A. Milani
Om billedet
| Id: | potw1140a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 3. oktober 2011 11:30 |
| Størrelse: | 1923 x 1923 px |
Om objektet
| Navn: | Antennae Galaxies |
| Type: | Local Universe : Galaxy : Type : Interacting |
| Afstand: | 75 million lysår |
| Constellation: | Corvus |
Baggrundsbilleder
Koordinater
| Position (RA): | 12 1 53.66 |
| Position (Dec): | -18° 52' 28.18" |
| Field of view: | 3.20 x 3.20 arcminutes |
| Orientering: | Nord er 0.2° venstre fra lodret |
Farver & filtre
| Bånd | Bølgelængde | Teleskop |
|---|---|---|
| Optisk B | 435 nm | Very Large Telescope FORS1 |
| Optisk V | 550 nm | Very Large Telescope FORS1 |
| Infrarød I | 814 nm | Very Large Telescope FORS1 |
| Optisk H-alpha + Nii | 658 nm | Very Large Telescope FORS1 |
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