Fredagskollokvium: Astrophysics with the Sunyaev-Zeldovich Effect

Tony Mroczkowski, European Southern Observatory (ESO), München.

Photo of Tony standing in front at an abstract painting
Tony Mroczkowski at the Fundació Joan Miró in Barcelona. Tony is fairly certain Miró was depicting an astronomer looking at the SZ decrement from a galaxy cluster. Photo: private.

As the largest nearly virialized objects that will ever form in our dark-energy-dominated Universe, galaxy clusters are important cosmological probes and universally representative astrophysical labs. They also serve as hosts to roughly half the galaxies in the Universe located at z < 2. Yet, perhaps because cosmological dimming limits the utility of X-ray observations, studies at high-z have so far been limited, and the effects of environment on galaxy evolution at z > 1 are often downplayed or ignored. Meanwhile, low-resolution (1-10 arcminute) surveys exploiting the thermal Sunyaev-Zeldovich (SZ) effect -- a distortion of the CMB that probes the thermal energy of the warm/hot intra-cluster medium (ICM) -- have been detecting high-z clusters, and have been used to (partially) characterize them. A salient feature of the SZ effect is its redshift-independent surface brightness.

Through the development of higher resolution and higher sensitivity mm/submm telescopes, the past decade has brought fantastic advances in using the SZ effect as a tool for astrophysics. Here I will present a few of these advances and discuss possible new directions in the era of AtLAST, including extensions to higher redshifts and lower mass systems such as imaging the CGM of massive galaxies.

Bildet kan inneholde: atmosfære, verden, astronomisk objekt, linje, gjøre.
With the advent of the ALMA+ACA array, the thermal Sunyaev-Zeldovich (SZ) effect is becoming one of the most efficient tools for characterizing galaxy cluster merger shocks, in addition to the more traditionally used X-ray observations. The well-known Bullet Cluter, with its spectacular wester shock front, represents the ideal test case for such studies. Credits: Di Mascolo, Mroczkowski, et al., 2019, A&A, 628, A100.

Please join via Zoom at

Meeting ID: 208 198 9350
Passcode: mHxvgf45

Attendees will be muted during the colloquium, but will have the opportunity to ask questions at the end by clicking on the "raise hand” button (or send a request via chat).

Emneord: institute seminar, fredagskollokvium, Sunyaev-Zeldovich effect, observations, extragalactic astronomy
Publisert 4. jan. 2022 13:13 - Sist endret 7. feb. 2022 14:58