The impact of AGN on the build-up of galaxies
| Main Author: | Wylezalek Dominika |
|---|---|
| Format: | info Proceeding |
| Terbitan: |
, 2019
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| Online Access: |
https://zenodo.org/record/3517947 |
Daftar Isi:
- It is well established that AGN take an active part in shaping the way the Universe looks. In particular, AGN feedback is a key ingredient in galaxy formation models and is now widely considered to be one of the main drivers in regulating the growth and assembly of massive galaxies. In my talk I will describe several efforts in our group to understand the power, reach and impact of AGN feedback processes and how they impact the build-up of galaxies and structures across cosmic time. At z ~ 0.7, we have found one of the first observational evidence that AGN-driven outflows can indeed suppress star formation in their hosts, consistent with the AGN having a `negative’ impact on the galaxies' SFH. Feedback signatures seem to be best observable in gas-rich galaxies where the coupling of the AGN-driven wind to the gas is strongest, in agreement with recent simulations. However, both star formation and quasar activity peaks at z ~ 2-3 where AGN are expected to impact the build-up of stellar mass the most. Our team recently discovered a unique population of luminous high-redshift (2 < z < 4) ex- tremely red quasars (ERQs) in the SDSS-III/BOSS and WISE surveys with extreme outflow properties, including blueshifted [OIII] lines at speeds up to 6000 km/s and unusual Lya profiles. The nature of the Lya emission in ERQs is especially intriguing, as it might be tracing quiescent filaments on halo scales or dusty, very clumpy, highly accelerated gas filaments close to the nucleus. ERQs are therefore the ideal population to obtain a census of the overall mass and energy budget of both outflow and infall/feeding from the CGM, an essential requirement to probe the detailed and full feedback loop. Building on these results, I will also introduce the JWST ERS Program "Q3D" (PI: Wylezalek) which will make use of the IFU capabilities of NIRSpec and MIRI and through which we will study the impact of three carefully selected luminous quasars on their hosts. Our program will provide a scientific dataset of broad interest serving as a pathfinder for JWST science investigations in IFU mode. Finally, in the last part of my talk, I will focus on potential indirect signatures of AGN feedback on galaxy cluster scales. Our group has found that high-z radio-loud AGN trace denser environments than (radio-quiet) galaxies of the same stellar mass and potentially trace higher mass dark matter halos. Recent simulations suggest that this difference is an indirect signature of AGN feedback which impacted the build-up of the stellar component of radio galaxies which translates into different galaxies populating each environment. Testing this very interesting hypothesis is one of the next challenges.