Ji Hoon Kim
@jhkim.bsky.social
Astronomer@Seoul National University; Project Manager of 7DT/7DS; LSBGs, Star-forming ISM, Late-type galaxy dynamics; He/him/views are own
It's paper day! 🧪🔭
Our latest paper investigates galaxy merger rates and their environmental dependence at z<0.2 using high-resolution Hyper Suprime-Cam (HSC) data.
ui.adsabs.harvard.edu/abs/2025arXi...
Our latest paper investigates galaxy merger rates and their environmental dependence at z<0.2 using high-resolution Hyper Suprime-Cam (HSC) data.
ui.adsabs.harvard.edu/abs/2025arXi...
Merger fraction in galaxy groups and clusters at z < 0.2: A non-parametric morphological study with Subaru Hyper Suprime-Cam
We investigate the environmental dependence of galaxy mergers using high-resolution imaging data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program. We focus on galaxy groups and clusters at $z...
ui.adsabs.harvard.edu
September 2, 2025 at 2:13 AM
It's paper day! 🧪🔭
Our latest paper investigates galaxy merger rates and their environmental dependence at z<0.2 using high-resolution Hyper Suprime-Cam (HSC) data.
ui.adsabs.harvard.edu/abs/2025arXi...
Our latest paper investigates galaxy merger rates and their environmental dependence at z<0.2 using high-resolution Hyper Suprime-Cam (HSC) data.
ui.adsabs.harvard.edu/abs/2025arXi...
Reposted by Ji Hoon Kim
Tidal dwarfs & non-equilibrium dynamics 🔭🧪
tritonstation.com/2025/08/20/n...
tritonstation.com/2025/08/20/n...
Non-equilibrium dynamics in galaxies that appear to lack dark matter: tidal dwarf galaxies
There are a number of galaxies that have been reported to lack dark matter. This is weird in a universe made of dark matter. It is also weird in MOND, which (if true) is what causes the inference o…
tritonstation.com
August 27, 2025 at 2:30 AM
Tidal dwarfs & non-equilibrium dynamics 🔭🧪
tritonstation.com/2025/08/20/n...
tritonstation.com/2025/08/20/n...
It's paper day! 🧪🔭
Our latest ApJS paper presents the second AllBRICQS catalog — 62 newly confirmed luminous quasars in the Northern Hemisphere (0.09 < z < 2.48), selected via WISE + Gaia DR3. Highlights include the most luminous FeLoBAL quasar ever found.
arxiv.org/pdf/2508.06028
Our latest ApJS paper presents the second AllBRICQS catalog — 62 newly confirmed luminous quasars in the Northern Hemisphere (0.09 < z < 2.48), selected via WISE + Gaia DR3. Highlights include the most luminous FeLoBAL quasar ever found.
arxiv.org/pdf/2508.06028
August 11, 2025 at 9:12 AM
It's paper day! 🧪🔭
Our latest ApJS paper presents the second AllBRICQS catalog — 62 newly confirmed luminous quasars in the Northern Hemisphere (0.09 < z < 2.48), selected via WISE + Gaia DR3. Highlights include the most luminous FeLoBAL quasar ever found.
arxiv.org/pdf/2508.06028
Our latest ApJS paper presents the second AllBRICQS catalog — 62 newly confirmed luminous quasars in the Northern Hemisphere (0.09 < z < 2.48), selected via WISE + Gaia DR3. Highlights include the most luminous FeLoBAL quasar ever found.
arxiv.org/pdf/2508.06028
Reposted by Ji Hoon Kim
July 14, 2025 at 2:20 PM
Reposted by Ji Hoon Kim
I often disagree with him, but Stacy’s physics posts are always thoughtful and informative, and the observational truth of Milgrom’s law — which Stacy has been trying to get people to take seriously for decades — really does seem to say something fundamental about the Universe. 🧪
The minimum acceleration in intergalactic space.
tritonstation.com/2025/07/13/t...
tritonstation.com/2025/07/13/t...
tritonstation.com
July 13, 2025 at 12:58 PM
I often disagree with him, but Stacy’s physics posts are always thoughtful and informative, and the observational truth of Milgrom’s law — which Stacy has been trying to get people to take seriously for decades — really does seem to say something fundamental about the Universe. 🧪
Reposted by Ji Hoon Kim
Here's a little side-by-side of a patch of our Virgo imaging (from Mihos+17) compared to today's Rubin release. I knew that Rubin field looked familiar! Nice to see they recover a lot of that low surface brightness structure. 🔭
June 23, 2025 at 4:22 PM
Here's a little side-by-side of a patch of our Virgo imaging (from Mihos+17) compared to today's Rubin release. I knew that Rubin field looked familiar! Nice to see they recover a lot of that low surface brightness structure. 🔭
Reposted by Ji Hoon Kim
All this time & Mike Turner still making promises he can’t keep. A quarter century ago it was “we will detect dark matter in five years.”
June 23, 2025 at 9:36 PM
All this time & Mike Turner still making promises he can’t keep. A quarter century ago it was “we will detect dark matter in five years.”
Reposted by Ji Hoon Kim
Another day testing the limits of resilience.
The Alexandria NSF building was designed for the NSF merit review process (gold standard), complete with a floor devoted to panels.
Now we aren’t allowed to have in person panels.
The loss of US science leadership will haunt this country for decades.
The Alexandria NSF building was designed for the NSF merit review process (gold standard), complete with a floor devoted to panels.
Now we aren’t allowed to have in person panels.
The loss of US science leadership will haunt this country for decades.
‘This is bull——”: National Science Foundation employees protest HUD's takeover
Dozens of National Science Foundation employees crowded the agency’s headquarters in Alexandria, Virginia, Wednesday to protest the news that the Department of Housing and Urban Development, or HUD, w...
www.nbcwashington.com
June 25, 2025 at 11:13 PM
Another day testing the limits of resilience.
The Alexandria NSF building was designed for the NSF merit review process (gold standard), complete with a floor devoted to panels.
Now we aren’t allowed to have in person panels.
The loss of US science leadership will haunt this country for decades.
The Alexandria NSF building was designed for the NSF merit review process (gold standard), complete with a floor devoted to panels.
Now we aren’t allowed to have in person panels.
The loss of US science leadership will haunt this country for decades.
Holy smokes.🔭🧪
noirlab.edu/public/news/...
noirlab.edu/public/news/...
Ever-changing Universe Revealed in First Imagery From NSF–DOE Vera C. Rubin Observatory
From distant stars and galaxies to asteroids whizzing through the Solar System, this next-generation facility unveils its first imagery and brings the night sky to life like never before.
noirlab.edu
June 24, 2025 at 5:31 AM
Holy smokes.🔭🧪
noirlab.edu/public/news/...
noirlab.edu/public/news/...
Taeho Ryu is providing a clue on the formation of blue straggler stars via magnetic field amplification. 🔭🧪
June 19, 2025 at 5:18 AM
Taeho Ryu is providing a clue on the formation of blue straggler stars via magnetic field amplification. 🔭🧪
Eun-jin Shin is giving a talk on IMBH formation in dwarf galaxies during IAUS398/MODEST-25. 🔭🧪
June 18, 2025 at 2:45 AM
Eun-jin Shin is giving a talk on IMBH formation in dwarf galaxies during IAUS398/MODEST-25. 🔭🧪
Michela Mapelli is starting the very first scientific talk for IAU Symposium 398/MODEST-25 “Compact Stars and Binaries in Dense Stellar Systems”. 🔭🧪
June 16, 2025 at 2:03 AM
Michela Mapelli is starting the very first scientific talk for IAU Symposium 398/MODEST-25 “Compact Stars and Binaries in Dense Stellar Systems”. 🔭🧪
After we impeached the president second time in 9 years, we are voting for the 21st president. While the entire globe is slowly turning conservative, we may have someone central. I mean not far right.
June 3, 2025 at 9:54 AM
After we impeached the president second time in 9 years, we are voting for the 21st president. While the entire globe is slowly turning conservative, we may have someone central. I mean not far right.
Based on my previous skeet five months ago, pot?
Booze or pot?
Led Zeppelin IV or The Dark Side of the Moon?
Which one of these two legendary albums from the early seventies are you more in tune with?
Which one of these two legendary albums from the early seventies are you more in tune with?
April 25, 2025 at 2:13 AM
Based on my previous skeet five months ago, pot?
Reposted by Ji Hoon Kim
Crisis at NASA
It's very bad news all round for NASA science, but the worst hit is Astrophysics (which includes cosmology) where the proposed cut is about two-thirds, which would be devastating.
It's very bad news all round for NASA science, but the worst hit is Astrophysics (which includes cosmology) where the proposed cut is about two-thirds, which would be devastating.
Crisis at NASA
It's very bad news all round for NASA science, but the worst hit is Astrophysics (which includes cosmology) where the proposed cut is about two-thirds, which would be devastating.
telescoper.blog
April 23, 2025 at 6:31 PM
Crisis at NASA
It's very bad news all round for NASA science, but the worst hit is Astrophysics (which includes cosmology) where the proposed cut is about two-thirds, which would be devastating.
It's very bad news all round for NASA science, but the worst hit is Astrophysics (which includes cosmology) where the proposed cut is about two-thirds, which would be devastating.
Woong-seop Jeong is giving a talk on SPHEREx at Seoul National University. 🔭🧪
April 24, 2025 at 7:37 AM
Woong-seop Jeong is giving a talk on SPHEREx at Seoul National University. 🔭🧪
Advertise your sky account in 3 words:
So it goes
So it goes
Advertise your sky account in 3 words:
Go fuck yourself
Go fuck yourself
Advertise your bsky account in 3 words:
This is fine.
This is fine.
January 19, 2025 at 8:58 AM
Advertise your sky account in 3 words:
So it goes
So it goes
Reposted by Ji Hoon Kim
New blog post - Old galaxies in the early universe
tritonstation.com/2025/01/14/o...
tritonstation.com/2025/01/14/o...
Old galaxies in the early universe
Continuing our discussion of galaxy formation and evolution in the age of JWST, we saw previously that there appears to be a population of galaxies that grew rapidly in the early universe, attainin…
tritonstation.com
January 14, 2025 at 5:57 PM
New blog post - Old galaxies in the early universe
tritonstation.com/2025/01/14/o...
tritonstation.com/2025/01/14/o...
Reposted by Ji Hoon Kim
Sort of an audiobook for a journal article. 🔭🧪
Stacy McGaugh (Case Western Reserve University) chats with Frank Timmes about his article on massive galaxies: youtu.be/48G1sqZuQTA
The AAS Journal Author Series connects authors with their article, their human story & the larger #astronomy community. 🔭
cc: @dudedarkmatter.bsky.social
The AAS Journal Author Series connects authors with their article, their human story & the larger #astronomy community. 🔭
cc: @dudedarkmatter.bsky.social
January 8, 2025 at 10:35 PM
Sort of an audiobook for a journal article. 🔭🧪
🔭🧪
Measuring the growth of the stellar mass of galaxies over cosmic time
tritonstation.com/2025/01/04/m...
tritonstation.com/2025/01/04/m...
Measuring the growth of the stellar mass of galaxies over cosmic time
This post continues the series summarizing our ApJ paper on high redshift galaxies. To keep it finite, I will focus here on the growth of stellar mass. The earlier post discussed what we expect in …
tritonstation.com
January 5, 2025 at 1:35 PM
🔭🧪
Reposted by Ji Hoon Kim
Videos for the new year for those who prefer their science in audiovisual form 🔭 🧪 tritonstation.com/2025/01/01/a...
A few videos for the new year
Happy new year to those who observe the Gregorian calendar. I will write a post on the observations that test the predictions discussed last time. It has been over a quarter century since Bob Sande…
tritonstation.com
January 2, 2025 at 6:22 PM
Videos for the new year for those who prefer their science in audiovisual form 🔭 🧪 tritonstation.com/2025/01/01/a...
Reposted by Ji Hoon Kim
In 1980, Jimmy Carter's administration backed Chun Doo-hwan's military regime, giving tacit approval to the brutal Gwangjy crackdown that resulted in the murder of thousands of civilians.
1980년 지미 카터 행정부는 전두환 군사 정권을 지원하여 수천 명의 민간인을 살해한 잔인한 광주의 진압을 암묵적으로 승인했습니다.
1980년 지미 카터 행정부는 전두환 군사 정권을 지원하여 수천 명의 민간인을 살해한 잔인한 광주의 진압을 암묵적으로 승인했습니다.
Records show how America stood back and watched as Gwangju was martyred for Korean democracy
US intelligence records obtained by an American journalist — and now out in Korean translation — show how meticulously the US watched as a junta massacred those protesting for democracy
english.hani.co.kr
December 30, 2024 at 2:26 PM
In 1980, Jimmy Carter's administration backed Chun Doo-hwan's military regime, giving tacit approval to the brutal Gwangjy crackdown that resulted in the murder of thousands of civilians.
1980년 지미 카터 행정부는 전두환 군사 정권을 지원하여 수천 명의 민간인을 살해한 잔인한 광주의 진압을 암묵적으로 승인했습니다.
1980년 지미 카터 행정부는 전두환 군사 정권을 지원하여 수천 명의 민간인을 살해한 잔인한 광주의 진압을 암묵적으로 승인했습니다.
Reposted by Ji Hoon Kim
I called it a “beautiful mess” - it ain’t confusing, it was predicted. tritonstation.com/2022/01/03/w...
December 27, 2024 at 11:54 AM
I called it a “beautiful mess” - it ain’t confusing, it was predicted. tritonstation.com/2022/01/03/w...
🔭🧪
A ray of science on this darkest day on the eve of dark days for rationalism
tritonstation.com/2024/12/20/o...
tritonstation.com/2024/12/20/o...
On the timescale for galaxy formation
I’ve been wanting to expand on the previous post ever since I wrote it, which is over a month ago now. It has been a busy end to the semester. Plus, there’s a lot to say – nothing…
tritonstation.com
December 21, 2024 at 1:36 PM
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