A pleasure to contribute to this nice piece on cloud-9, the underachieving halo, on NPR! www.npr.org/2026/01/21/n...

Congratulations to Alejandro Benítez-Llambay + student/team for this interesting discovery. Also happy to report that my most recent ApJ paper is the first to cite this work. hashtag#LatinAmericanExcellence lnkd.in/g-xJ7iYz

It’s paper day. We examine MW-scale satellite quenched fractions along simulations and observations (led by F. Mercado). Enjoy! 🌀 🛰️ arxiv.org/abs/2512.06071

Our paper on galaxy ignition in the post-reionization universe has now been accepted for publication (ApJ) ⚫️🧨🌀https://arxiv.org/abs/2511.03785

Igniting galaxy formation in the post-reionization universe It is widely believed that the ultraviolet background produced during the epoch of reionization conspires against the formation of low-mass galaxies. Indeed, this mechanism is often invoked as a solut...

I wrote a manuscript on galaxy ignition in the post-reionization universe. A bittersweet milestone. This is my 70th paper and I’ve reached 4000 citations. But it’s also four months without my beloved father, to whom I dedicate this work. arxiv.org/abs/2511.03785 ♥️

I wrote a manuscript on galaxy ignition in the post-reionization universe. A bittersweet milestone. This is my 70th paper and I’ve reached 4000 citations. But it’s also four months without my beloved father, to whom I dedicate this work. arxiv.org/abs/2511.03785 ♥️

Our paper on the emergence of galactic discs has now been accepted for publication (MNRAS). 🔥 📦 🍊 🌀 arxiv.org/abs/2508.00991

Congratulations to David Olloqui Cortés on his first conference talk! 🇲🇽🇲🇽🇲🇽

A pleasure to co-lead a discussion with Dušan Kereš on galaxy formation and cosmic rays at this year’s Galfresca conference! 🌌 🔥

Our paper on resolved scaling relations in IllustrisTNG has now been accepted for publication (ApJ). arxiv.org/abs/2501.18687

It’s paper day. We find that the emergence of disk galaxies is connected to the bursty-to-steady star formation transition and the deepening of the gravitational potential well. 🌌 🔥 📦 arxiv.org/abs/2508.00991

Note: if you’re looking for great colloquium speakers this autumn, be sure to invite Prof. Coral Wheeler (Cal Poly Pomona) 🐎 🍂

It’s LSST/Rubin-relevant paper day. We investigate how not being able to detect faint stellar halos biases our understanding of ultrafaint galaxies, thus limiting their applicability to constrain galaxy formation and dark matter physics. 🌌 🔥https://arxiv.org/abs/2506.15785

It’s paper day. We compare the kinematic-age structure of FIRE-2 galaxies to observations, agreeing with LG + PHANGs, but not the MW (a dynamically cold outlier). 🌀 🌌 🔥 arxiv.org/abs/2506.11840

It’s paper day. We use IllustrisTNG to investigate resolved scaling relationship. See also our awesome spaxel leaky box analytics model! 🌌 💜https://arxiv.org/abs/2501.18687

Congratulations to our beloved children, Camila and Mateo, for graduating from university and high school. And to my beloved Viri for raising such kind and amazing young adults. We are proud of you and we love you! 👏🏽🎓♥️

It’s paper day. We find that many Milky Way analogs experienced a pickle shaped transient period throughout their formation history! 🌀 🥒 🔥 arxiv.org/abs/2506.08508

NACA - Fighting for Economic Justice YouTube video by NACA Neighborhood Assistance Corp. of America

Here’s some history: youtu.be/uP4neOffo3g?...

NACA - Fighting for Economic Justice YouTube video by NACA Neighborhood Assistance Corp. of America

Here’s some history: youtu.be/uP4neOffo3g?...

Huge thanks to NACA, the Neighborhood Assistance Corporation of America, for helping us make homeownership possible, and for fighting against racial injustice and housing discrimination in America for decades. Thank you! ♥️🖤 www.naca.com

We bought a house! 🏡 This is for our family and our ancestors! After a long history of discrimination, redlining, segregation, mass deportations, mob violence and subprime shark practices against our people, we are here today! ¡Esta es para mi gente! Homeownership is economic justice! 🏡✊🏽♥️

It’s paper day! Check out our latest paper on galactic shapes in FIREbox. Tip of the hat to Courtney Klein for leading this effort! 🔥 📦 🌌 arxiv.org/abs/2503.05612

It’s paper day! Our paper on galactic sizes has now been accepted for publication (ApJ). Tip of the hat to Francisco Mercado for leading this effort! arxiv.org/abs/2501.04084 @astronomerc.bsky.social

where I will be a panelist along with artist Marcus Zúñiga and others, as part of his exhibition From the Ground Up: Nurturing Diversity in Hostile Environments. I hope many of you are able to attend! 🖼️ 🌌 www.armoryarts.org/schedule/202...

It’s paper day! We explore resolved scaling relations with IllustrisTNG. What a weird time to be an American scientist… arxiv.org/abs/2501.18687

Thank you all for your kind birthday wishes! The saga continues… ♥️🎂💪🏾🥂

It’s paper day. We find that galactic sizes are driven by a complex interplay between virial mass and environment. arxiv.org/abs/2501.04084

🥹🥹🥹

In the blink of an eye, Francisco more than doubled the size of our research group. As a postdoc, he has really exceeded all expectations! 🌌 🔥

A pleasure to speak at USC! 🔥🌃