Meta & Fysikken: Afsnit 67: James Webb Space Telescope Special
Vi taler om James Webb Space Telescope, de første billeder derfra, og alt det som vi kan forvente os i de kommende år, af det temmeligt dyre isenkram vi har sendt ud i det ydre rum!
Karina’s noter til dagens afsnit:
https://www.nasa.gov/webbfirstimages
1) Galakse Hoben SMACS 0723: Afstand: 4.6 billion/milliard lysaar
Hubble og JWST sammenlignings billede:
-Webb’s image is approximately the size of a grain of sand held at arm’s length
Gravitationel lense:
-The combined mass of this galaxy cluster acts as a gravitational lens, magnifying more distant galaxies, including some seen when the universe was less than a billion years old.
The powerful gravitational field of a galaxy cluster can bend the light rays from more distant galaxies behind it, just as a magnifying glass bends and warps images.Other features include the prominent arcs in this field.
https://webbtelescope.org/contents/media/images/2022/035/01G7HRMY93K0BCCBKCABAQH0V7
Farverne i billede betyder:
-This deep field, taken by Webb’s Near-Infrared Camera (NIRCam), is a composite made from images at different wavelengths, totaling 12.5 hours (Hubble Deep field var 14 dage observationstid)
Blue galaxies contain stars, but very little dust. The red objects in this field are enshrouded in thick layers of dust. Green galaxies are populated with hydrocarbons and other chemical compounds.
Meget fjerne Galakser:
-Det mest spaendende er de svage roede gnidrede pletter. Det er galakser der er saa fjerne at Hubble ikke kunne se dem.Webb’s MIRI image offers a kaleidoscope of colors and highlights where the dust is – a major ingredient for star formation, and ultimately life itself.
Her er et link til et spectrum af en af disse röde pletter:
https://webbtelescope.org/contents/media/images/2022/035/01G7F33FYJY94B9H7FW1APV030
og her er der endnu flere spectra af andre meget fjerne galakser:
https://webbtelescope.org/contents/media/images/2022/035/01G7HRYVGM1TKW556NVJ1BHPDZ
ESA's side har det hele samlet og godt forklaret:
JWST Southern Ring Nebula:
En planetarisk tåge har intet med planeter at gøre.
Gas og støv bliver slynget ud fra en stjerne sidst i dets liv.
I midten er der 2 stjerner. Den ene er dækket af støv og kun synlig i det ene billede.
På billede ser man en masse farvede prikker. Det er galakser der photo-bomber!
JWST WASP - 96
Her er et billede af lyskurven, hvor planeten blev opdaget:
sammenlignet med:
Det er procent lys på y-aksen.
Der er et dyp på 1%, og det kan ses så tydeligt.
Med Webb kan man se variationer på 0.02%
JWST Stephan’s Quintet:
Billedet er sammensat af 1000 billeder og fylder ca. 1/5 af månens diameter
Together, the five galaxies of Stephan’s Quintet are also known as the Hickson Compact Group 92 (HCG 92). Although called a “quintet,” only four of the galaxies are truly close together and caught up in a cosmic dance. The fifth and leftmost galaxy, called NGC 7320, is well in the foreground compared with the other four. NGC 7320 resides 40 million light-years from Earth, while the other four galaxies (NGC 7317, NGC 7318A, NGC 7318B, and NGC 7319) are about 290 million light-years away.
Billedet her er også godt, der er farve beskrivelser:
https://www.esa.int/ESA_Multimedia/Sets/Webb_First_Images/(result_type)/images