Vedant Chandra

Much more discussion and detail is in the paper itself, and we build upon the fantastic work done by several groups to piece together a plausible history of our Galaxy.

TNG50 #519311 Evolution

You can see a movie of this simulated galaxy's evolution here: youtube.com/watch?v=1q1T...

Making and staring at movies like these was by far one of the highlights of my job so far.

We interpret our findings using the IllustrisTNG50 cosmological simulation, finding one particularly similar analog that perhaps provides clues about our own Galaxy's formation story, chiefly a decisive major merger that thickens the old disk and seeds the young disk

Using Gaia-based alpha abundances from Jiadong Li, we can isolate high-alpha stars that obey a well-behaved age-metallicity relation. This panel therefore truly represents a time-ordered 'portrait' of the birth of the Milky Way disk across ~5 billion years

Illustrating the orbital 'circularity' distribution as a function of metallicity - a rough proxy for cosmic time - we find a distinct three-phase behavior roughly corresponding to the protogalaxy, 'spinup' to an early disk, and 'cooldown' to a young disk.

We assemble an all-sky sample of 10 million red giant stars with metallicities and 6D motions from Gaia to ask a simple question: how did the the orbital structure our galaxy evolve over time?

It's a pleasure to share our new paper using the wealth of data from Gaia DR3:

'The Three-Phase Evolution of the Milky Way' arxiv.org/abs/2310.13050

The cosmic web leaves a mark on visible matter through subtle correlations involving galaxy shapes. How do we quantify these "Intrinsic Alignments"?
For the long answer, see “The IA Guide”, now on arXiv! For the short answer, keep reading. arxiv.org/abs/2309.08605

The elusive stellar component of the Magellanic Stream, found at last by Chandra et al! That is my #arXivoftheweek (it's from June. I'm still working through a backlog) https://arxiv.org/abs/2306.15719 🔭