UA Science
Left: Dan Marrone, Professor, Astronomer, Steward Observatory Right: CK Chan, Associate Astronomer, Steward Observatory Center: The Event Horizon Telescope (EHT) collaboration, which in 2022 presented the first image of Sagittarius A*, the black hole at the center of our Milky Way, has captured a new view of the massive object, this time in polarized light. For the first time astronomers have been able to measure polarization, a signature of magnetic fields, this close to the edge of the black hole. The lines mark the orientation of polarization, which is related to the magnetic field around the black hole's shadow.

Astronomers capture magnetic fields twirling around black hole

A new image from the Event Horizon Telescope collaboration, which includes researchers and telescopes of the University of Arizona, has uncovered strong and organized magnetic fields spiraling from the edge of the supermassive black hole Sagittarius A*, or Sgr A*.

Seen in polarized light for the first time, this new view of the monster lurking at the center of our Milky Way galaxy has revealed a magnetic field structure strikingly similar to that of a much more massive black hole, known as M87*, at the center of the M87 galaxy, suggesting that strong magnetic fields may be common to all black holes. This similarity also hints toward a hidden jet in Sgr A*. The results were published on March 27 in the journal The Astrophysical Journal Letters.

Read more

Webb telescope takes its first images of forming planetary systems

A team led by Jarron Leisenring at the UArizona Steward Observatory has obtained the deepest look yet into planetary nurseries.

By taking advantage of the dust-penetrating capabilities of the James Webb Space Telescope's infrared instruments, designed and built in part by University of Arizona scientists, astronomers have obtained the first direct observations with the new space telescope of gas and dust feeding a nascent...

Logan Pearce: Astronomy PhD Candidate

As she prepares to graduate with her PhD, Logan Pearce reflects on her previous career in middle school education, and discusses her plans for her upcoming postdoc fellowship at the University of Michigan. Read more below!

What brought you to Steward Observatory?

I always wanted to pursue both astronomy and a career in the Navy. Following my Navy career, I taught middle school science for 6 years. In getting kids excited about space, it reminded me how excited I was about space, and that I had the opportunity to make a career out of it. I returned for a second undergrad at the University of...

Welcome! Dr. Antranik Sefilian our 2024 51 Pegasi b Fellow

Congratulations to Dr. Antranik Sefilian, who will be joining Steward Observatory as a 2024 51 Pegasi b Fellow,...

For the public
For Public

Public events include our Monday Night Lecture Series, world-reknowned Astronomy Camp and Mt Lemmon Sky Center.

For Students

A good place to start if you want to become an undergrad major or grad student, or need to find our schedule of classes.


For Scientists
For Scientists

Find telescopes and instruments, telescope time applications, staff and mountain contacts, and faculty and staff scientific interests.