Andrey Kravtsov
@grumpy1.bsky.social
Food for thought/discussion.
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November 13, 2025 at 7:41 PM
Food for thought/discussion.
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Aurora over lake Michigan tonight. In the background are Castor, Pollux, Jupiter, and Procyon.
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November 12, 2025 at 4:34 AM
Aurora over lake Michigan tonight. In the background are Castor, Pollux, Jupiter, and Procyon.
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(Adler) Planetarium eclipse...
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November 7, 2025 at 6:24 PM
(Adler) Planetarium eclipse...
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"Beyond Hubble": a workshop aimed to trigger cross discussions between observers and theorists on our current understanding on galaxy morphology and kinematics, with an emphasis on revisiting the Hubble Sequence in the modern-day galaxy formation framework.
sites.google.com/cam.ac.uk/be...
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sites.google.com/cam.ac.uk/be...
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October 24, 2025 at 3:40 PM
"Beyond Hubble": a workshop aimed to trigger cross discussions between observers and theorists on our current understanding on galaxy morphology and kinematics, with an emphasis on revisiting the Hubble Sequence in the modern-day galaxy formation framework.
sites.google.com/cam.ac.uk/be...
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sites.google.com/cam.ac.uk/be...
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Here is a mid-infrared image of the same galaxy. The emission in this image is produced by the warm dust and polycyclic aromatic hydrocarbons (PAHs).
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June 30, 2025 at 9:37 PM
Here is a mid-infrared image of the same galaxy. The emission in this image is produced by the warm dust and polycyclic aromatic hydrocarbons (PAHs).
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A new fantastic image of M82 by JWST NIRCam, showing a biconical outflow of gas and dust from this starbursting galaxy.
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esawebb.org/images/potm2...
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esawebb.org/images/potm2...
June 30, 2025 at 9:20 PM
A new fantastic image of M82 by JWST NIRCam, showing a biconical outflow of gas and dust from this starbursting galaxy.
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esawebb.org/images/potm2...
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esawebb.org/images/potm2...
If your next European adventure does not pan out, Illinois has alternatives to offer...
March 2, 2025 at 12:26 AM
If your next European adventure does not pan out, Illinois has alternatives to offer...
A reminder from @astrokatie.com at the end of her "Picture an Astronomer" talk at UChicago tonight that no matter what you see in the news, things can get MUCH worse if the Higgs field tunnels to its true vacuum state... 🧪🔭
February 8, 2025 at 5:30 AM
A reminder from @astrokatie.com at the end of her "Picture an Astronomer" talk at UChicago tonight that no matter what you see in the news, things can get MUCH worse if the Higgs field tunnels to its true vacuum state... 🧪🔭
Best wishes for 2025 everyone! 🧪
December 31, 2024 at 6:59 PM
Best wishes for 2025 everyone! 🧪
From Yuan-Sen Ting on X. Evolution of the programming languages use in astronomy research.
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December 19, 2024 at 3:01 PM
From Yuan-Sen Ting on X. Evolution of the programming languages use in astronomy research.
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Intergalactic salsa dance anyone?
This is an infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope. If you wonder why it looks different than typical images of galaxies, this is because this image shows dust particles and dense gas.
This is an infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope. If you wonder why it looks different than typical images of galaxies, this is because this image shows dust particles and dense gas.
December 14, 2024 at 1:39 AM
Intergalactic salsa dance anyone?
This is an infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope. If you wonder why it looks different than typical images of galaxies, this is because this image shows dust particles and dense gas.
This is an infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope. If you wonder why it looks different than typical images of galaxies, this is because this image shows dust particles and dense gas.
Not a particularly impressive image taken with my phone (but what do you expect from a theorist?..) on a flight last week. This view of the Moon and Venus over Mississippi at sunset was pretty mesmerizing though.
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December 14, 2024 at 1:30 AM
Not a particularly impressive image taken with my phone (but what do you expect from a theorist?..) on a flight last week. This view of the Moon and Venus over Mississippi at sunset was pretty mesmerizing though.
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The source plane reconstruction of light in this galaxy looks like this. There is evidence that Milky Way went through a similar stage early on when most stars formed in massive clusters.
science.nasa.gov/missions/web...
science.nasa.gov/missions/web...
December 11, 2024 at 5:41 PM
The source plane reconstruction of light in this galaxy looks like this. There is evidence that Milky Way went through a similar stage early on when most stars formed in massive clusters.
science.nasa.gov/missions/web...
science.nasa.gov/missions/web...
Firefly Sparkle is a galaxy with mass was discovered in JWST observations of a galaxy cluster as a highly lensed and magnified source. Remarkably, about half of stars in this galaxy are in 10 massive star clusters. This galaxy provides a unique view into the youth of our own Milky Way galaxy. 🔭
December 11, 2024 at 5:39 PM
Firefly Sparkle is a galaxy with mass was discovered in JWST observations of a galaxy cluster as a highly lensed and magnified source. Remarkably, about half of stars in this galaxy are in 10 massive star clusters. This galaxy provides a unique view into the youth of our own Milky Way galaxy. 🔭
@jwstfeed.bsky.social
Amazing new field imaged by JWST with a nascent cluster of galaxies.
esawebb.org/news/weic2428/
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Amazing new field imaged by JWST with a nascent cluster of galaxies.
esawebb.org/news/weic2428/
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December 10, 2024 at 10:36 PM
@jwstfeed.bsky.social
Amazing new field imaged by JWST with a nascent cluster of galaxies.
esawebb.org/news/weic2428/
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Amazing new field imaged by JWST with a nascent cluster of galaxies.
esawebb.org/news/weic2428/
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Derek Lindstrom, who received a heart transplant a year ago, completed his 115th marathon last Saturday (Nov 9) in Indianapolis setting the world record among runners with transplants. First 10k he averaged under 12 min/mi. 🧪
His story is recounted here:
www.jsonline.com/story/sports...
His story is recounted here:
www.jsonline.com/story/sports...
November 11, 2024 at 3:41 PM
Derek Lindstrom, who received a heart transplant a year ago, completed his 115th marathon last Saturday (Nov 9) in Indianapolis setting the world record among runners with transplants. First 10k he averaged under 12 min/mi. 🧪
His story is recounted here:
www.jsonline.com/story/sports...
His story is recounted here:
www.jsonline.com/story/sports...
David had a big impact on my scientific career and careers of many of his PhD students
July 17, 2024 at 7:06 PM
David had a big impact on my scientific career and careers of many of his PhD students
Great three days of science and meeting old friends at David Weinberg's 60th fest at the University of Utah.
July 17, 2024 at 7:04 PM
Great three days of science and meeting old friends at David Weinberg's 60th fest at the University of Utah.
The plot below shows the said mass Mdm(<r_1/2) as a function of stellar mass with the model shown by lines and shaded bands (+individual galaxies outside the 2 sigma band), while observed Milky Way dwarf satellites and ultra-diffuse galaxies are shown by red stars and magenta symbols.
June 21, 2024 at 5:03 AM
The plot below shows the said mass Mdm(<r_1/2) as a function of stellar mass with the model shown by lines and shaded bands (+individual galaxies outside the 2 sigma band), while observed Milky Way dwarf satellites and ultra-diffuse galaxies are shown by red stars and magenta symbols.
Sun's crescent on the way to totality today via a pasta strainer... 🔭🧪😎
April 9, 2024 at 1:35 AM
Sun's crescent on the way to totality today via a pasta strainer... 🔭🧪😎
JWST composite image of NGC 628. I think observations did not just catch up with simulations but overtook them by a lot...
Still seems to be qualitatively consistent with the star formation - feedback cycle that is reflected in the long depletion time...
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Still seems to be qualitatively consistent with the star formation - feedback cycle that is reflected in the long depletion time...
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January 13, 2024 at 5:06 AM
JWST composite image of NGC 628. I think observations did not just catch up with simulations but overtook them by a lot...
Still seems to be qualitatively consistent with the star formation - feedback cycle that is reflected in the long depletion time...
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Still seems to be qualitatively consistent with the star formation - feedback cycle that is reflected in the long depletion time...
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