Astronomi iFokus

Astronomi

Etiketter: rymdenuniversum
Läst 56 ggr
Magi-cat
1

Earendel, den avlägsnaste av stjärnor

Avstånden i tid och rum är hisnande. 😎🌞🌟

Hubble-teleskopet har funnit ljus från en 🌟, från de första miljarderna av år efter big bang, vilket utgör ett rekord.

"The newly detected star is so far away that its light has taken 12.9 billion years to reach Earth, appearing to us as it did when the universe was only 7 percent of its current age, at redshift 6.2."

Nu ska Webb-teleskopet få fortsätta att undersöka den.

"Astronomers expect that Earendel will remain highly magnified for years to come. It will be observed by NASA's James Webb Space Telescope. Webb's high sensitivity to infrared light is needed to learn more about Earendel, because its light is stretched (redshifted) to longer infrared wavelengths due to the universe's expansion."

"With Webb, we may see stars even farther than Earendel, which would be incredibly exciting," Welch said. "We'll go as far back as we can. I would love to see Webb break Earendel's distance record."

https://hubblesite.org/contents/news-releases/2022/news-2022-003?fbclid=IwAR2SWTP9vzdzyDfUbMXN9RDpPViebcu-KX7P3nCPlV20YdLbpuJcEjdDdfU

"Freden måste komma först. Gör den inte det, min vän, kommer inget efter den."
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Record Broken: Hubble Spots Farthest Star Ever Seen
  • Redigerat 2022-03-31 12:59 av Magi-cat
Sindri
1
#1

Det är ofattbart……🤔🤔🤔

Earendel - låter som ett land skapat av Tolkien.

Magi-cat
1
#2

#1 Jag associerade också genast till Tolkien. 🙂🌟

"Freden måste komma först. Gör den inte det, min vän, kommer inget efter den."
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Tarotstollan
1
#3

Visste inte ens att Hubble fortfarande fungerade, hur länge har de beräknat att den skall "leva"?
Fantastiskt! Det finns mycket där ute vi aldrig kommer att få veta i detta livet!

Igår gjorde jag ingenting och blev inte klar, så jag fortsätter idag!

Magi-cat
1
#4

Här är abstract till artikeln i Nature de refererar till.

https://www.nature.com/articles/s41586-022-04449-y

"Freden måste komma först. Gör den inte det, min vän, kommer inget efter den."
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A highly magnified star at redshift 6.2 - Nature
Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or hundreds, stretching galaxies into giant arcs1,2. Individual stars can attain even higher magnifications given fortuitous alignment with the lensing cluster. Recently, several individual stars at redshifts between approximately 1 and 1.5 have been discovered, magnified by factors of thousands, temporarily boosted by microlensing3–6. Here we report observations of a more distant and persistent magnified star at a redshift of 6.2 ± 0.1, 900 million years after the Big Bang. This star is magnified by a factor of thousands by the foreground galaxy cluster lens WHL0137–08 (redshift 0.566), as estimated by four independent lens models. Unlike previous lensed stars, the magnification and observed brightness (AB magnitude, 27.2) have remained roughly constant over 3.5 years of imaging and follow-up. The delensed absolute UV magnitude, −10 ± 2, is consistent with a star of mass greater than 50 times the mass of the Sun. Confirmation and spectral classification are forthcoming from approved observations with the James Webb Space Telescope. A massive star at a redshift of 6.2, corresponding to 900 million years after the Big Bang, is magnified greatly by lensing of the foreground galaxy cluster WH0137–08.
Magi-cat
1
#5

Angående namnet Earendel: 🙂

The name Earendel comes from an Old English word meaning "morning star" or "rising light". It's not much to look at in the Hubble photo - just a faint blob on a long crescent of light created by the lens that's been dubbed the "Sunrise Arc".

https://www.bbc.com/news/science-environment-60931100

"Freden måste komma först. Gör den inte det, min vän, kommer inget efter den."
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Hubble: 'Single star' detected at record-breaking distance
The Hubble telescope sees an individual star whose light has taken 12.9 billion years to reach us.
Magi-cat
1
#6

Om Hubble, still going strong. Och snart kommer Webb.

"Webb is due to start full science operations in two or three months' time. Mr Welch and colleagues have already been granted time on the new observatory to go and look at Earendel.

But it's worth celebrating for a moment the continued brilliance of Hubble. It was launched in 1990 and even as a new wonder observatory prepares to take up the reins, Hubble keeps turning out ground-breaking studies.

"The Hubble Space Telescope is doing very well," said Nasa project scientist Dr Jennifer Wiseman.

"It's powerful. It's as scientifically productive as ever, and we're looking forward to the kinds of science that Hubble will be doing in the coming years. We're particularly excited about the James Webb Space Telescope also operating in space along with the Hubble Space Telescope. By having both of these amazing facilities, we're going to learn more about the Universe than we've ever been able to before.""

https://www.bbc.com/news/science-environment-60931100

"Freden måste komma först. Gör den inte det, min vän, kommer inget efter den."
💓 Sajtvärd på Fenomen, Hjärnan, Kulturtant, Oförklarade fenomen

Hubble: 'Single star' detected at record-breaking distance
The Hubble telescope sees an individual star whose light has taken 12.9 billion years to reach us.