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Imad Pasha @prappleizer.bsky.social · Feb 4

The paper is out in ApjL if you want to read it! iopscience.iop.org/article/10.3...

The Bullseye: HST, Keck/KCWI, and Dragonfly Characterization of a Giant Nine-ringed Galaxy - IOPscienceSearchopens in new tab

The Bullseye: HST, Keck/KCWI, and Dragonfly Characterization of a Giant Nine-ringed Galaxy, Pasha, Imad, van Dokkum, Pieter G., Liu, Qing, Bowman, William P., Janssens, Steven R., Keim, Michael A., Ne...

iopscience.iop.org

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Imad Pasha @prappleizer.bsky.social · Feb 4

Supporting that this evolutionary pathway is possible. For the dynamics-minded, this system will also allow for really strong constraints on the DM halo shape and DM distribution, as the rings are clean tracers of the potential out to large radii, something we’re following up with!

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Imad Pasha @prappleizer.bsky.social · Feb 4

Some simulations have suggested that these ring galaxies can evolve into giant low surface brightness galaxies, another enigmatic population. Here we find faded rings in the distant outskirts of the system that rival the size of such galaxies, making this the first observational evidence…

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Imad Pasha @prappleizer.bsky.social · Feb 4

These rings formed in the aftermath of the smaller blue galaxy flying through the center of a massive spiral. We were able to measure the ring positions and spacing, and it turns out to match predictions from analytic theory extremely well over a wide range. But there’s more…

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Imad Pasha @prappleizer.bsky.social · Feb 4

Happy to share my latest paper, characterizing a rare-to-catch post collision galaxy with nine rings! Nice write up from stsci hubblesite.org/contents/new...

Straight Shot: Hubble Investigates Galaxy with Nine Rings

hubblesite.org

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Reposted by Imad Pasha

Space Telescope Science Institute @stsci.edu · Feb 4

Bullseye! Researchers using Hubble found a massive galaxy rippling with nine star-filled rings after an “arrow,” the blue dwarf galaxy to its center-left, plunged through its core 50 million years ago. A thin trail of gas still links the pair: bit.ly/4hcX52n 🔭 🧪

A large galaxy is at center, and a significantly smaller galaxy is to its left. The large galaxy, nicknamed the Bullseye, is mostly face-on, but the top appears slightly tilted away. It has several rings. Its circular core is bright white at the very center, but light yellow overall. Going outward, there are gaps between the rings. The core is surrounded by two slightly lighter yellow rings, which also appear to be overlapping. The next ring is slightly more transparent and yellow. The two or three rings that are farther out are bluer, sometimes with blue clumps. The widest ring is also blue, but also the most transparent. At 9 o’clock is a small dwarf galaxy. It is about the same size as the yellow core of the Bullseye. The dwarf galaxy is blue, with many dots. It looks like the edge of the Bullseye might touch the dwarf galaxy. Both galaxies are set on the black background of space, which is dotted with a range of galaxies in different shapes, colors, and sizes.

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Reposted by Imad Pasha

Malena Rice @malenarice.bsky.social · Nov 23

Applications are open for the 2025 Dorrit Hoffleit Research Fellowship program for current undergraduate students to conduct summer research in the Yale Department of Astronomy!

Open to 2nd/3rd year undergrads of any nationality — due February 15th 🪐🧪🚀 astronomy.yale.edu/undergraduat...

Dorrit Hoffleit Undergraduate Research Scholarship | Department of Astronomy

astronomy.yale.edu

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Reposted by Imad Pasha

John F Wu @jwuphysics.bsky.social · Nov 17

Awesome job opportunity for PhDs with observational astronomy and software engineering skills!

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Pieter van Dokkum @dokkum.bsky.social · Nov 16

This little movie illustrates the "filter tilter" concept of the 1000-lens array we're building in Chile. This is a single telephoto lens, raw 5 minute exposures. We're looking for a new team member to help turn such data into 3D images of cosmic flows!
aas.org/jobregister/...

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Reposted by Imad Pasha

Chloe Neufeld @chloeneufeld.bsky.social · Nov 15

Looking for speakers for Yale's Galaxy Lunch! If you're a grad student or postdoc working on galaxy formation/evolution research, we'd love to have you present at our seminar. Reach out to me ([email protected]) or find more information about the seminar here:
yalegalaxylunch.github.io/about/

Seminar Overview · Yale Galaxy Lunch

yalegalaxylunch.github.io

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Imad Pasha @prappleizer.bsky.social · Nov 15

Can I be added if I defended this week? I’m clinging on to the grad status for at least a month…

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Imad Pasha @prappleizer.bsky.social · Nov 14

Feel free to reach out to me if you have questions or want to chat about the position!

Imad Pasha @prappleizer.bsky.social · Nov 14

Interested in working on the development of novel data analysis techniques? Our team at Dragonfly is hiring for a data algorithms position for a forthcoming 1000 lens array observatory in Chile! 5 year position w/great benefits and location flexibility: aas.org/jobregister/...

Software Developer for the Dragonfly FRO | American Astronomical Society

Dragonfly is a Convergent Research Focused Research Organization (FRO). Our mission is to capture the faint cosmic web of gas that connects galaxies across the universe, using a groundbreaking distrib...

aas.org

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