Figured I would get in on this whole starter pack thing and list (in whatever order bsky chooses) scientists working on studying galaxies (broadly defined, including galaxy formation/evolution + near-field cosmology). If I missed you and you'd like to be added, let me know!

🧪🔭

go.bsky.app/5ZZtqDy

#dwarfgalaxies2024 serendipitously found the hedgehog galaxy. Named because it's cute and spiky. It's an isolated, quenched dwarf at 2.4Mpc.

Some key points from Draco: based on multiple epochs, binaries not having a significant impact. Seems like Draco is cusped, and the stars are mostly on tangential orbits. #dwarfgalaxies2024

#dwarfgalaxies2024 holy cow those are *proper motion dispersions* with the same error bars as the radial velocities. Can rule out a cored profile with 2 sigma confidence. Next is Scl, UMi, and JWST!

Next we have @evitral.bsky.social #dwarfgalaxies2024 on constraining dark matter profiles with 3d kinematics of dwarf profiles. He nicely lays out how we get these proper motions and how long it takes (including images of himself over the 18 year timespan of these observations)

We are back from lunch and John wise is reviewing the first stars, the first galaxies and reionisation #dwarfgalaxies2024. He showed us a video of his simulation narrated by BENEDICT CUMBERBATCH. As such, John has won the conference.

Always so happy when people explain stuff nicely right in the beginning 🤩

#dwarfgalaxies2024 Joaquin Sureda: halo shapes in LYRA change when stars form, turning more spherical as more stars form. Reionization relics should remain prolate. Some halos can cuspify through baryon collapse.

#dwarfgalaxies2024 Massive satellites cause multiple clumps in energy and angular momentum space over multiple orbits. Can also have different chemical signatures if progenitor has a metallicity gradient. This means we may be identifying the same merger events as different mergers.

Very relevant result!

#dwarfgalaxies2024 using FIRE Isabel Sands suggests HI rotation curves are not a good representation of DM halo profiles due to time dependence and extra pressure terms, resulting in artificially diverse RCs. arxiv.org/abs/2404.16247

📣 PAPER ALERT 📣
Check out our latest study of the Draco dwarf galaxy, and how we constructed a radially resolved 3D velocity dispersion profile for a dwarf galaxy! 😄✨💫⚫
Details here: iopscience.iop.org/article/10.3...

Check out Kevin's new paper on how to combine multi-epoch data from different telescopes, to construct robust proper motions! 💫🛰️

arxiv.org/abs/2310.20099

Lots of nice applications for this! 👀

Hello universe! 👋🤓