Sam Ponnada
@samponnada.bsky.social
Astrophysicist @ Caltech by way of UIowa | they/he | Fan of galaxies (esp. B-fields and cosmic rays), tea, and the outdoors
It's paper day! Here, we argue using general analytic calculations & results from various galaxy formation simulations that recent X-ray and tSZ observations place strong joint constraints on the pressure budget of galactic halos which are hard to meet without a significant presence of cosmic rays.
Ponnada, Hopkins, Lu, Silich, Butsky, Keres: Strong Evidence for Cosmic Ray-Supported $\sim$L$^{\ast}$ Galaxy Halos via X-ray \& tSZ Constraints https://arxiv.org/abs/2510.13959 https://arxiv.org/pdf/2510.13959 https://arxiv.org/html/2510.13959
October 17, 2025 at 3:29 PM
It's paper day! Here, we argue using general analytic calculations & results from various galaxy formation simulations that recent X-ray and tSZ observations place strong joint constraints on the pressure budget of galactic halos which are hard to meet without a significant presence of cosmic rays.
It's paper day!
Sam B. Ponnada: Time-Dependent Cosmic Ray Halos from Bursty Star Formation and Active Galactic Nuclei: Semi-Analytic Formalism and Galaxy Formation Implications https://arxiv.org/abs/2509.02697 https://arxiv.org/pdf/2509.02697 https://arxiv.org/html/2509.02697
September 4, 2025 at 7:16 PM
It's paper day!
Reposted by Sam Ponnada
More urgent than ever, now is the time to call up your congresspeople (see e.g. AAS guide if you want):
aas.org/urge-nasa-su...
aas.org/urge-nasa-su...
May 2, 2025 at 5:05 PM
More urgent than ever, now is the time to call up your congresspeople (see e.g. AAS guide if you want):
aas.org/urge-nasa-su...
aas.org/urge-nasa-su...
Reposted by Sam Ponnada
Hey folks - like many people, our friends have lost their house and everything in it. If you are able to help support them through a long, slow recovery, please do. #LAFires
gofund.me/a24b7e39
gofund.me/a24b7e39
Donate to Supporting Jenn & Sam after the Eaton Fire, organized by Jenn Burt
Hi friends,
As many of you already know, the wildfires that tore through Alta… Jenn Burt needs your support for Supporting Jenn & Sam after the Eaton Fire
gofund.me
January 10, 2025 at 8:27 PM
Hey folks - like many people, our friends have lost their house and everything in it. If you are able to help support them through a long, slow recovery, please do. #LAFires
gofund.me/a24b7e39
gofund.me/a24b7e39
Reposted by Sam Ponnada
Hey bluesky! Do you want to develop your own open-source software in Python? Apply to attend Code/Astro!
Website: semaphorep.github.io/codeastro/
Scroll all the way down for the application link. :) Apps are due Feb 1! (1/2)
Website: semaphorep.github.io/codeastro/
Scroll all the way down for the application link. :) Apps are due Feb 1! (1/2)
Program Description
A Software Engineering Workshop for Astronomy
semaphorep.github.io
January 4, 2025 at 2:22 AM
Hey bluesky! Do you want to develop your own open-source software in Python? Apply to attend Code/Astro!
Website: semaphorep.github.io/codeastro/
Scroll all the way down for the application link. :) Apps are due Feb 1! (1/2)
Website: semaphorep.github.io/codeastro/
Scroll all the way down for the application link. :) Apps are due Feb 1! (1/2)
Reposted by Sam Ponnada
Well this is awesome: about.usps.com/newsroom/nat...
December 18, 2024 at 9:27 PM
Well this is awesome: about.usps.com/newsroom/nat...
Reposted by Sam Ponnada
I was inspired by Harvard PhD candidate Claire Lamman, who I was lucky enough to have as a TF during my undergrad to "doodle my paper" to make it a bit easier to digest!
Full version at: sydvach.github.io#research
Full version at: sydvach.github.io#research
March 7, 2024 at 5:42 AM
I was inspired by Harvard PhD candidate Claire Lamman, who I was lucky enough to have as a TF during my undergrad to "doodle my paper" to make it a bit easier to digest!
Full version at: sydvach.github.io#research
Full version at: sydvach.github.io#research
Reposted by Sam Ponnada
Functional threads on the skyline! 🧵
Yooooooooooo
Go into "settings," "thread preferences," and select "threaded mode". MUCH nicer
Go into "settings," "thread preferences," and select "threaded mode". MUCH nicer
September 27, 2023 at 4:56 AM
Functional threads on the skyline! 🧵
Reposted by Sam Ponnada
is the posting strike over yet
September 20, 2023 at 4:21 AM
is the posting strike over yet