Callum Witten (@callumwitten) header
Callum Witten (@callumwitten) profile picture

Callum Witten

@callumwitten

Postdoctoral researcher at @obsge studying galaxies in the very early Universe; the interplay between galaxy properties and their environments. (he\him)

callumwitten.com
Joined November 2023
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Wolfson college PhD student has helped solve an early Universe mystery shar.es/aggq5Q @Cambridge_Uni @cambridge_astro
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A combo of JWST/NIRCam observations & magnetohydrodynamic simulations suggests that frequent mergers with close companions give rise to bursty star formation and hence the unexpectedly high Ly-α emission detected from early galaxies. @callumwitten et al.: nature.com/articles/s41550-0…
Image from Nature Astronomy (@NatureAstronomy)
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The unmatched resolution and sensitivity of James Webb has revealed, for the first time, what lies in the local environment of galaxies in the very early Universe. New research by IoA PhD student Callum Witten, published today in Nature Astronomy. ast.cam.ac.uk/content/webb.r…
Image from Institute of Astronomy, Cambridge (@cambridge_astro)
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The unmatched resolution and sensitivity of James Webb has revealed, for the first time, what lies in the local environment of galaxies in the very early Universe. New research by KICC PhD student Callum Witten, published today in Nature Astronomy. ast.cam.ac.uk/content/webb.r…
Image from Kavli Institute for Cosmology, Cambridge, UK (@KICC_official)
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Callum Witten retweeted
European Space Agency (@esa) profile picture
European Space Agency
@esa18 Jan 2024
The NASA/ESA/CSA James #Webb Space Telescope has solved one of the most puzzling mysteries in astronomy using galaxy mergers! Previously, astronomers didn't know why we detect light from hydrogen atoms which should have been entirely blocked by the pristine gas that formed after the Big-Bang, until now. Find out how they did it 👉 esawebb.org/images/weic2402a…
A graphic with three images. The top image, labelled “CEERS survey”, shows many square images of stars and galaxies, stitched together according to their locations in the sky. One square is highlighted, and a cutout on the bottom left shows it enlarged, labelled “Webb/ NIRCam”. A tiny spot is shown zoomed-in to the right, labelled “EGSY8p7” with a scale marker of “0.5 arcsec”. Here it can be seen that the spot is three neighbouring galaxies, appearing as coloured blobs with bright, distinct cores.

ALT A graphic with three images. The top image, labelled “CEERS survey”, shows many square images of stars and galaxies, stitched together according to their locations in the sky. One square is highlighted, and a cutout on the bottom left shows it enlarged, labelled “Webb/ NIRCam”. A tiny spot is shown zoomed-in to the right, labelled “EGSY8p7” with a scale marker of “0.5 arcsec”. Here it can be seen that the spot is three neighbouring galaxies, appearing as coloured blobs with bright, distinct cores.

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🆕 Webb has found the origin of a mysterious light from some of the earliest galaxies 🕯️🌌. Read more: esawebb.org/news/weic2402/ or 🧵👇
A graphic with three images. The top image, labelled “CEERS survey”, shows many square images of stars and galaxies, stitched together according to their locations in the sky. One square is highlighted, and a cutout on the bottom left shows it enlarged, labelled “Webb/ NIRCam”. A tiny spot is shown zoomed-in to the right, labelled “EGSY8p7” with a scale marker of “0.5 arcsec”. Here it can be seen that the spot is three neighbouring galaxies, appearing as coloured blobs with bright, distinct cores.

ALT A graphic with three images. The top image, labelled “CEERS survey”, shows many square images of stars and galaxies, stitched together according to their locations in the sky. One square is highlighted, and a cutout on the bottom left shows it enlarged, labelled “Webb/ NIRCam”. A tiny spot is shown zoomed-in to the right, labelled “EGSY8p7” with a scale marker of “0.5 arcsec”. Here it can be seen that the spot is three neighbouring galaxies, appearing as coloured blobs with bright, distinct cores.

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GN-z11 paper day 🧵: With Callum Witten, @nicolastro63 and the JADES collaboration we analysed the latest @NASAWebb @ESA_Webb DDT data from the NIRSpec IFU. And we found a Lyman-alpha halo around z=10.603 galaxy! How cool is that! arxiv.org/abs/2306.09142
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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