Ji Hoon Kim
@jhkim.bsky.social
Astronomer@Seoul National University; Project Manager/Scientist of 7DT/7DS; LSBGs, Star-forming ISM, Late-type galaxy dynamics; He/him/views are own
A mosaiced image of Fornax Cluster based on multi-band images from 7DT. Inspired by a recent paper on NGC 1427A using VLT/MUSE. 🧪🔭
I just realized I’ve been way too lazy. Not only have I been putting off promoting our work, but I didn't even notice they are already up here. 🧪🔭
AstroArxiv@astroarxiv.bsky.social · 5mo agoA Hybrid Framework for Kilonova Anomaly Detection using Single-Epoch SEDs from the 7-Dimensional Telescope. Gregory S. H. Paek et. al. https://arxiv.org/abs/2603.13814
I just found it. This is one of the first scientific results utilizing commissioning data from the 7-Dimensional Telescope. 🧪🔭
AstroArxiv@astroarxiv.bsky.social · 3mo ago7DT Insight: Variability in Young Stellar Objects. Mi-Ryang Kim et. al. https://arxiv.org/abs/2605.18366
Mansi Kasliwal is giving the first plenary talk on RAPID in this SPIE ATI conference. 🔭🧪
I am heading to Copenhagen to attend SPIE ATI. A long flight waiting ahead.
(1/n) 🧵 Now published in Part 1 of the HWO25 conference proceedings, this collection of 60 science cases illustrates the extraordinary scientific reach of the #HabitableWorldsObservatory from... 🧪🔭☄️ #extragalactic #exoplanets #galactic
I'm going to expand this statement to say that astronomers should actually look at their data whatever the format. Yes pipelines and high level science products are great, but you learn a lot from just spending some time exploring the counts-on-pixels images, even for spectroscopy. 🔭
Stacy McGaugh@dudedarkmatter.bsky.social · 5mo agoEnjoying looking through the HST images of ARP galaxies just published by @dalcantonjd.bsky.social et al. It is good for astronomers to actually *look* at galaxies, as the authors specifically note. If only we also read the text… iopscience.iop.org/article/10.3...
Isn't it really close to what is depicted in Plot against America?
Bill Madden@maddenifico.bsky.social · 7mo agoSomething horrifying is happening in America: Because he was filming ICE Nazis, whuch is protected under the constitution, an American citizen in St. Paul, Minnesota was brutalized to the point of becoming unresponsive. What happened in Nazi Germany is happening in America. 😳👇
A (dark matter) Space Oddity: We have an exciting new paper led by @pengfeili.bsky.social: arxiv.org/abs/2511.17705 He used the best data on the Milky Way rotation curve from Gaia to infer not the current, but the *primordial* dark-matter halo of the Galaxy. And it is quite odd. 🧪🔭☄️ 1/6
The odd primordial halo of the Milky Way implied by Gaia. A shallow core, but a steep decline
Primordial dark matter halos are well understood from cold dark matter-only simulations. Since they can contract significantly as baryons settle into their centers, direct comparisons with observed ga...
arxiv.org
The galaxy size - mass relation including gas. It’s not just about the stars! tritonstation.com/2025/11/19/t...
The baryonic sizes and masses of late type galaxies, and a bit about their angular momentum
I have always been interested in the extremes of galaxy properties, especially to low surface brightness (LSB). LSB galaxies are hard to find and observe, so they present an evergreen opportunity f…
tritonstation.com
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...
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
Tidal dwarfs & non-equilibrium dynamics 🔭🧪 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
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
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. 🧪
Stacy McGaugh@dudedarkmatter.bsky.social · last yr.The minimum acceleration in intergalactic space. tritonstation.com/2025/07/13/t...
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. 🔭
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.”
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.
‘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...
nbcwashington.com
Holy smokes.🔭🧪 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
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. 🔭🧪
