Jan Scholtz, Logic Wizard (@astrojansen) header
Jan Scholtz, Logic Wizard (@astrojansen) profile picture

Jan Scholtz, Logic Wizard

@astrojansen

Astronomer @KICC_official, studying galaxies and supermassive black holes. I sometimes cycle. Cynical optimist. He/him

 Cambridge, United Kingdom
janscholtz.co.uk
Joined November 2012
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Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)Photo by Jan Scholtz, Logic Wizard (@astrojansen)
Jan Scholtz, Logic Wizard retweeted
Pablo Pérez González (@PGPerezGonzalez) profile picture
Pablo Pérez González@PGPerezGonzalez21 Jul 2025
Our paper on the Jekyll massive quiescent galaxy and its surroundings is finally published in @NatureAstronomy today! nature.com/articles/s41550-0…
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The annual Kavli JWST panic pizza happened again last night. Making sure we feed people submitting last-minute proposals that they started the day before. Because the best ideas come <24 hours before the deadline.
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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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. arxiv.org/abs/2409.20533
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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There is so much cool stuff to go over. The fact that we were able to constrain the density and metallicity of the gas. Or the fact that looking at the dynamical mass, we found a very low gas fraction. This galaxy is probably very gas-poor! Outflows in the past?
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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Jan Scholtz, Logic Wizard retweeted
Joris Witstok (@JorisWitstok) profile picture
Joris Witstok@JorisWitstok7 Sep 2024
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 👇
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New student paper day! With Giovanni Mazzolari with looked into the identification of type-2 AGN in the CEERS data. Based on different emission line diagnostics we found that about 20% of CEERS galaxies are AGN candidates - and not X-rays arxiv.org/abs/2408.15615#
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Jan Scholtz, Logic Wizard retweeted
Jaythechou (@jaythechou) profile picture
Jaythechou
@jaythechou2 Aug 2024
I Photoshop Paddington into a movie, TV show, or pop culture until I forget: Day 1241
Image from Jaythechou (@jaythechou)
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One thing I took from today's ALMA reviewer is that uncharted territory is not the right place to do science. Let's stick to only the known parts...
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Last week we did a short interview in Czech TV about the most distant galaxy and black hole. It was nerve-wracking and exciting at the same time ;)
Martin Lulak (@polar_andy_cz) profile pictureMartin Lulak@polar_andy_cz2 Jul 2024
Pozoruje ty nejvzdálenější kouty známého vesmíru. Objevil nejstarší galaxii i nejstarší supermasivní černou díru, kterou kdy lidstvo zatím pozorovalo. Řeč je samozřejmě o @NASAWebb. A na obou objevech, s jeho využitím, se podílel český astrofyzik @astrojansen! 🙂
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We went to a gin making class today. I just had to name my gin after gnz11. Hostile, unforgiving and utterly crazy.
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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We added some more NIRSpec/MSA data and more importantly, incredibly deep ALMA data targeting molecular gas. 7 hours on source data with absolutely no detection - The gas fraction in this galaxy is <1%!!! We were absolutely stunned by this!
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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So we started playing some games with the NIRSpec and ALMA data. If you use the star formation histories to reconstruct the gas fraction histories of this galaxy, you find that you don't need any massive outflows to get rid of the gas. It will just appear on the Main sequence!
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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We don't need massive ejective feedback, the AGN "just" has to stop the accretion from the IGM, or the outflows == inflows. It is one more piece of evidence about cumulative AGN feedback.
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Friday was a paper day!!! arxiv.org/abs/2405.19401 We used ALMA + JWST/NIRSpec (both MSA and IFS) to investigate the evolution of a massive quiescent/PSB galaxy at z~3.
Net-zero gas inflow: Measurement of the gas consumption history of...

Net-zero gas inflow: Measurement of the gas consumption history of...

JWST is discovering increasing numbers of quiescent galaxies 1--2 billion years after the Big Bang, whose redshift, high mass, and old stellar ages indicate that their formation and quenching were...

arxiv.org
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The galaxy was properly studied by Francesco D'Eugenio and @PGPerezGonzalez last year, they found a compact stellar disc in it and a massive neutral gas outflow!
Image from Jan Scholtz, Logic Wizard (@astrojansen)
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Full summary by Kevin!
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And of course, Francesco D'Eugenio was one of the main authors of the z~14.2. cam.ac.uk/research/news/earl…

Earliest, most distant galaxy discovered with James Webb Space Telescope

Found in a region near the Hubble Ultra Deep Field by the JWST Advanced Deep Extragalactic Survey (JADES) team, these galaxies mark a major milestone in the study of the early Universe. “These...

cam.ac.uk
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Jan Scholtz, Logic Wizard retweeted
NASA Webb Telescope (@NASAWebb) profile picture
NASA Webb Telescope
@NASAWebb30 May 2024
The world’s most powerful space telescope has done it again. Webb has discovered what appears to be a new record-holder for the most distant known galaxy — shattering its own previous record. This galaxy existed only 290 million years after the big bang: blogs.nasa.gov/webb/2024/05/…
A field of thousands of small galaxies of various shapes and colors on the black background of space. A bright foreground star with diffraction spikes is at lower left. Near the center, a tiny white box outlines a region and two diagonal lines lead to a larger box at the upper right, enlarging the view of this area. Within the box is a banana-shaped blob that is blueish-red in one half and distinctly red in the other half. An arrow points to the redder portion and is labeled “JADES GS z 14 0.”

ALT A field of thousands of small galaxies of various shapes and colors on the black background of space. A bright foreground star with diffraction spikes is at lower left. Near the center, a tiny white box outlines a region and two diagonal lines lead to a larger box at the upper right, enlarging the view of this area. Within the box is a banana-shaped blob that is blueish-red in one half and distinctly red in the other half. An arrow points to the redder portion and is labeled “JADES GS z 14 0.”

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It is out, we can talk about this! JADES discovered the two most distant galaxies at redshift 14, less than 300 million years after the Big Bang. webbtelescope.org/contents/e…
NASA’s James Webb Space Telescope Finds Most Distant Known Galaxy - NASA Science

NASA’s James Webb Space Telescope Finds Most Distant Known Galaxy - NASA Science

Editor’s Note: This post highlights data from Webb science in progress, which has not yet been through the peer-review process. Over the last two years, scientists have used NASA’s James Webb Space...

science.nasa.gov
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This was spectacular to work on! If you have any questions about the R1000 fluxes or data release in general let me know !
MAST (@MAST_News) profile pictureMAST@MAST_News8 May 2024
HLSP Update: The JADES Collaboration releases a third set of mosaics, spectra, and catalogs. The new mosaics cover 56 sq arc minutes of the GOODS-N field while over 4000 spectra with 2375 sources with measured redshifts comprise the spectroscopic release. archive.stsci.edu/hlsp/jades
The figure shows a cutout from the full GOODS-N image covering the original HDF. It is a mosaic of JADES JWST/NIRCam data covering the original Hubble Deep Field region. Shown are the F444W, F200W, and F090W mosaics as the red-green-blue channels of this multicolor image. Hundreds of galaxies, some resolved enough to see their shape, others unresolved and left as dots of light, are seen in a variety of colors ranging from blues to yellows and reds. The iconic Hubble Deep Field (Williams et al. 1996) footprint is shown as a silver line.

ALT The figure shows a cutout from the full GOODS-N image covering the original HDF. It is a mosaic of JADES JWST/NIRCam data covering the original Hubble Deep Field region. Shown are the F444W, F200W, and F090W mosaics as the red-green-blue channels of this multicolor image. Hundreds of galaxies, some resolved enough to see their shape, others unresolved and left as dots of light, are seen in a variety of colors ranging from blues to yellows and reds. The iconic Hubble Deep Field (Williams et al. 1996) footprint is shown as a silver line.

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