William (Will) Cerny

Interacting galaxies from the Arp-Madore catalog, viewed with the Hubble Space Telescope.

ARP! ARP! ARP! ☄️🔭 arxiv.org/abs/2509.09011

12.09.2025 02:55 — 👍 133    🔁 22    💬 7    📌 2

"[Vera] Rubin addressed the [1996] graduating class at the University of California, Berkeley, saying: 'I hope that you will fight injustice and discrimination in all its guises'" 🔭

11.02.2025 17:41 — 👍 110    🔁 47    💬 2    📌 0

Mia and the Martians (Mia Explores) Mia and the Martians (Mia Explores) [Louden, Emma, Harrison, Dr. Tanya, Pasman, Wouter] on Amazon.com. *FREE* shipping on qualifying offers. Mia and the Martians (Mia Explores)

Looking for a last minute holiday gift?

Mia and the Martians is a new children’s book by myself and @tanyaofmars.bsky.social all about a little girl and her cat, Nebula, who go to Mars for her science fair. They meet the rovers and learn science and emotional lessons from each one

amzn.to/4fvtBuQ

20.12.2024 18:49 — 👍 22    🔁 8    💬 0    📌 0

Aaand our next Aeos paper is out as well!!

Jennifer Mead leads the paper, finding feedback blows out all metals from early halos until they reach a mass of about 10^7 Msun. Read it here: arxiv.org/abs/2411.14209

22.11.2024 16:13 — 👍 7    🔁 4    💬 0    📌 0

A plot of the brightness (absolute magnitude) of the Milky Way's population of star clusters and dwarf galaxies, as a function of their size (half-light radius). Bright galaxies and clusters occupy distinct regions of this parameter space, but for the faintest objects the two classes overlap so that it is no longer possible to classify a system just from its size and luminosity. Two satellites, Eridanus III and DELVE 1, which have absolute magnitudes of -2 and 0 and sizes of about 7 pc, respectively, are plotted as red diamonds.

🔭 Paper announcement! With @alexji.bsky.social, @wcerny.bsky.social, and a host of others, we analyze some of the first spectroscopy of stars in compact (r < 10 pc), ultra-faint Milky Way satellites in arxiv.org/abs/2410.08276. Our two target systems are highlighted here:

14.10.2024 20:14 — 👍 7    🔁 5    💬 1    📌 0

Two-panel image. Left panel: supernova explosion with elements from the periodic table flying out. Right panel: red giant star with pullout showing its atmosphere contains those same elements.

Our paper on the Barbenheimer Star is now published in ApJL! iopscience.iop.org/article/10.3... We at @sdssurveys.bsky.social find evidence for an ancient explosion of an unusually massive star that should have collapsed to a black hole. Thread and 🔭
Image: UChicago/SDSS-V/Melissa Weiss

31.01.2024 16:41 — 👍 25    🔁 8    💬 1    📌 0

Okay, this is pretty cool -- Vera Rubin will be on 2025 American quarters!! 🔭 www.usmint.gov/news/press-r...

19.10.2023 13:34 — 👍 15    🔁 3    💬 1    📌 0

Stellar density map centered on the new diffuse dwarf galaxy candidate, showing a clear concentration of black points indicative of the dwarf galaxy's presence. At the bottom of the image, an elliptical concentration of stars associated with its host, the LMC-mass galaxy NGC 55, are visible. The satellite appears to be about 1/3 the diameter of its host!

I'm a day late, but I wanted to advertise the latest paper from the DES and DELVE collaborations, led by Mitch McNanna! The paper's results include the discovery of a *very* diffuse (resolved) dwarf galaxy candidate near the LMC-mass host NGC 55 (D ~ 2 Mpc). Read it here:
arxiv.org/abs/2309.04467

13.09.2023 02:27 — 👍 15    🔁 2    💬 0    📌 1

It looks promising to me.. I have another one just like this, so maybe we should do go get follow-up data for them :)

23.08.2023 17:16 — 👍 1    🔁 0    💬 1    📌 0