Joris Witstok
@JorisWitstok
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https://t.co/ccri9af8cG
BlueSky
Joined July 2011
Unexpected, bright hydrogen emission caught astronomers by surprise 🔭😳 I'm proud to have led a study reporting this surprising result, which is now published in @nature. Read more in this Behind the paper post and on @bluesky! https://t.co/2hb2mIoiF6
https://t.co/cJEKDpA6n0
communities.springernature.com
While the Universe right after the Big Bang was blisteringly hot, a rapid expansion and cooldown subsequently rendered it opaque to energetic ultraviolet light. This ‘fogginess’ was gradually cleared...
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Come to our conference in April next year! 🧭🌌🏰 👉 Submit your abstract here:
docs.google.com
We invite abstract submissions for contributed talks at our conference Charting Cosmic Dawn In Copenhagen 2026, taking place 12-17 April 2026. We especially encourage applications by junior scienti...
We are excited to make the first official announcement for the 𝗖𝗵𝗮𝗿𝘁𝗶𝗻𝗴 𝗖𝗼𝘀𝗺𝗶𝗰 𝗗𝗮𝘄𝗻 conference in Copenhagen in 12–17 April next year 🤩 https://t.co/OkJM6zYrb7
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A wonderful summary of our results on the enigmatic galaxy GS-z13-1 came out in Physics Today a few days ago! https://t.co/mDCNT35UiC
physicstoday.aip.org
As the James Webb Space Telescope looks back at the universe’s first billion years, surprises continue to turn up.
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The universe also has eras! Webb spotted a surprising galaxy from just 330 million years after the big bang, during the universe’s “era of reionization.” It shouldn’t have been detectable because of the composition of the early universe, but it was! How? https://t.co/131EArruHF
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🆕 Webb has seen an unexpected ‘first light’ 🌟 in one of the most distant galaxies yet discovered: JADES-GS-z13-1 Read more: https://t.co/RkVbV6uNYR or 🧵👇
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It was a pleasure to come onto The @NakedScientists podcast to chat about the earliest galaxies!
News podcast: @KSaebParsy @Cambridge_Uni on transplants; @JorisWitstok @DAWNCopenhagen on galaxies; Nick Turk-Browne @YalePsychology on early memory; and Andy Pickford and Brooke Wain @portsmouthuni on tackling plastic, supported by @UKRI_News. https://t.co/KJgdenMLA7
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Nature research paper: Witnessing the onset of reionization through Lyman-α emission at redshift 13 https://t.co/JW0HnD9R56
nature.com
Nature - Spectroscopy from the JWST Advanced Deep Extragalactic Survey of a galaxy at redshift 13 shows a singular, bright emission line identified as Lyman-α, suggesting the onset of...
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Earliest sign of the Universe becoming transparent discovered with @ESA_Webb. @JorisWitstok et al. detect the escape of your favorite UV light, Lyman α, the signature of an ionized bubble, only 330M years after the Big Bang. 🇬🇧 https://t.co/RzHqPb4X9h 🇩🇰
cosmicdawn.dk
Universets første galakser blev født indhyllet i en “tåget” gas, og kunne ikke ses tydeligt før denne tåge var lettet. Ved hjælp af rumteleskopet James Webb har et internationalt hold af forskere,...
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It's paper day! Very excited to share that my latest paper, and the first to come from my PhD, is on @arxiv today:
arxiv.org
Dust is a fundamental component of the interstellar medium within galaxies, as dust grains are highly efficient absorbers of ultraviolet (UV) and optical photons. Accurately quantifying this...
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Proud supervisor day! New to the arXiv https://t.co/nSYslxTi0J - remember those cool galaxies in the first JWST data releases that showed us [OIII]4363?! - One of them revealed a high ionisation potential line (work by @JarleBrinchmann) an early indication of all the BHs! (1/n)
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Happy birthday to Niels Bohr! 🥳 As per tradition, today was the institute's annual picture day. A tour of his office served as a reminder how much of (astro)physics derives from quantum theory he pioneered – together with many seeking refuge from authoritarians in Denmark...
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So, JADES-GS-z14-0, has been shown (by two independent teams looking at the same data from ALMA) to be at z = 14.18! The galaxy has been confirmed to have both carbon AND oxygen emission, only 294 million years after the Big Bang.
We detected oxygen in a galaxy at z=14.18ish, refining the redshift. @stefanocarniani led the paper and we also confirmed the detection of carbon from JWST. https://t.co/pjBN1JQcO2
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🧑💻 Hopefully more to follow as we continue to explore the distant cosmos!
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🌌 Building on previous work, I will be studying how early galaxies were affected by their stars synthesising elements heavier than helium for the first time, at a time when the reionisation of the Universe was taking place.
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🔭 Excited to have started a new position this week as @DAWNCopenhagen Fellow at the Niels Bohr Institute, @Uni_Copenhagen!
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JWST finds distant galaxy with “impossible” light signature JWST didn't "break" the Universe. But one early galaxy, JADES-GS-z13-1-LA, has a Lyman-α emission line more than 200 million years earlier than anything else. https://t.co/G9hq6cPrcB cc:@Kevin_Hainline @JorisWitstok
bigthink.com
The Lyman-α emission line has never been seen earlier than 550 million years after the Big Bang. So why does JADES-GS-z13-1-LA have one?
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We confirmed the tiny green blob below to be a galaxy so distant it is seen when the Universe was only 2% of its current age, and… its spectrum came out as a huge surprise! 📈🔭 Read more in the excellent summary by @Kevin_Hainline who first discovered this galaxy 👇
Let's chat. This is a spectrum of a galaxy, JADES-GS-z13-1-LA, a source I discovered last year as part of my big high-redshift catalog. This is the spectroscopic confirmation of it being at z = 13 from @JorisWitstok's recent paper ( https://t.co/SJ9BSGsGXp). Wait, what's that?
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Incredible series of opening ceremonies to welcome participants to a historical #IAUGA2024, held on the African continent for the first time 🤩🇿🇦
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Read the latest from @LuizPauloSouza_, celebrating the first two years of @ESA_Webb that has brought us 'a nova revolução': https://t.co/wbkOOPxp8E
veja.abril.com.br
Dois anos após enviar suas primeiras imagens do universo, o telescópio supera as expectativas e começa a impactar o campo da astrofísica
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