Bologna&Friends

Contribution List

1. WELCOME

01/03/2023, 14:00

2. Elisabetta Liuzzo: Radio Galaxies with the Event Horizon Telescope

01/03/2023, 14:30

Event Horizon Telescope (EHT) represents an unique Earth-sized very long baseline interferometry (VLBI) array observing at 1.3 mm able to catch AGN black hole (BH) shadows. The angular resolution achieved by the EHT is unprecedented, being of the order of 25 microarcsec, and it allowed the first BH imaging at event horizon scales of the supermassive black hole M87 and Sgr A. Total intensity...

3. Paola Rossi: Simulations of jets: results and perspectives

01/03/2023, 14:50

Relativistic magnetohydrodynamical numerical simulations represent a fundamental tool for studying the dynamics of jets from their acceleration region, to the propagation and termination. We will discuss the main results for the different jet regions. We will illustrate the possible deceleration process from relativistic to subrelativistic velocities occurring in the inner region of low...

4. Loic Chantry: Two-component injection profile and FR0/FRI classification

01/03/2023, 15:10

The relationship between spine-jet and outer layer could play a role in the classification of
FR0/FR1 radio galaxies. Using the asymptotic part of meridional self-solutions in Kerr metric
models to describe the spine-jet, as well as an extension describing the outer layer, we are
able to compute two-component injection profiles. In this injection model, the velocity ratio
between the axial...

5. Mauro Dadina: Ultra-fast outflows in RQ and RL AGN

01/03/2023, 15:20

In the last twenty years, the study of ultra-fast outflows (UFOs) in AGNs has been recognized as a fundamental topic to be tackled in order to understand how the SMBH shaped the evolution of their host galaxies across cosmic times. Here I will focus on some basic aspects of our current knowledge of the astrophysics of the phenomenon with a comparison of what we learned from RQ and from RL...

6. Cosimo Marconcini: MOKA3D: innovative approach to 3D AGN outflow kinematic modelling: accurate determination of outflow physical properties

01/03/2023, 15:35

The determination of outflow physical properties is important to assess the possible effects of Active Galactic Nuclei feedback on host galaxies and to compare observed outflow properties with model predictions. However, current estimates are based on simplified assumptions and do not take into account many observational aspects like projection effects and spatial resolution. I present MOKA3D...

7. Marisa Brienza: New insights into the duty cycle of radio galaxies

01/03/2023, 16:30

Jets in active galactic nuclei are episodic in nature, cycling through periods of activity and quiescence. The study of this duty cycle is essential for quantifying their energetic feedback on the host galaxy and surrounding environment, which is a key parameter in galaxy evolution models. However, how this duty cycle varies as a function of e.g. source type, environment, host, is still a...

8. Samantha Casadei: Characterization of 3C radio galaxies environment

01/03/2023, 16:55

The question whether the different classes of radio galaxies is influenced or, in turn, it influences the nearby environment is still an open issue. Previous studies concluded that the radio galaxies classified as BLO and HEG are mostly isolated galaxies, or at most in small groups, while LEGs tend to lie in a richer environment (i.e., groups or clusters). In this work, we studied a sample of...

9. Ivan Delvecchio: How not to get lost in the jungle of radio AGN: clues from their hosts

01/03/2023, 17:05

Radio-selected AGN are undoubtedly a great class of objects for studying BH duty cycle, AGN feedback and their long-term impact on galaxy evolution. However, radio AGN samples are highly heterogeneous, spanning several orders of magnitudes in size, obscuration, kinetic power and eddington ratio. In the local Universe, spatially resolved imaging, optical spectroscopy and radio morphologies have...

10. Giovanni Cresci: Bubbles and outflows: the novel JWST/NIRSpec view of the z=1.59 quasar XID2028

02/03/2023, 09:15

Thanks to its existing extensive multi-wavelength coverage and to the massive and extended outflow detected both in the ionised and molecular components, XID2028 at z=1.6 represents a unique test case to study QSO feedback in action at the peak epoch of AGN-galaxy coevolution. This target was thus selected to be observed with the NIRSpec and MIRI IFU on board of JWST during the Cycle 0 Early...

11. Lorenzo Ulivi: Outflows and feedback in jetted AGN

02/03/2023, 09:35

Traditionally, AGN feedback is thought to operate through either kinetically powerful (>10^45 erg/s), extended (10s kpc) jets or massive gas outflows. Recent observational work and simulations suggest that also low-power (<10^45 erg/s) jets may play an important role, but little is known about their actual effect on their host galaxies.
We aim to investigate the relationship between radio...

12. Gianluca Castignani: AGN feedback in radio galaxies at mm wavelengths

02/03/2023, 09:45

I will review some of the most recent results on AGN feedback in radio galaxies based on millimeter studies which rely on single dish (e.g., APEX, IRAM-30m, LMT) and interferometric (e.g., ALMA, NOEMA) observations. I will describe in particular how recent observations of cold molecular gas, which is the fuel of star formation, can give insights on both positive and negative radio-mode AGN...

13. Francesco Ubertosi: AGN feedback from FR0, FRI, and FRII galaxy clusters

02/03/2023, 10:00

When radio-loud active galactic nuclei (AGN) live in dense environments, we can obtain insights on their properties and lifecycle from the imprints they leave on the surrounding environment. In this talk I will present our recent results on the effects that radio galaxies can have on the gaseous atmospheres of their host galaxy groups or clusters. In particular, I will show how using X-ray...

14. Barbara Balmaverde: MURALES

02/03/2023, 10:15

MURALES is a survey of tens of nearby radio galaxies up to z about 0.8 with the optical integral field spectrograph MUSE at VLT. The main aim is to explore the gas kinematics, its relationship with the relativistic outflows, and unveil jet-triggered star forming regions, enabling us to explore quantitatively the feedback process. In my review I will present the past and the state-of-art...

15. Laura Di Gesu: Blazars from the new observational window of X-ray polarimetry: the first year of IXPE observations of blazars

02/03/2023, 11:40

The NASA/ASI Imaging X-ray Polarimetry Explorer (IXPE) was launched on December 9, 2021 thereby opening the new observational window of X-ray polarimetry. Blazars, which are active galactic nuclei (AGN) where the jet is oriented towards the observer, are prime candidates for X-ray polarization observations. In particular, a high degree of X-ray polarization is expected from high energy peaked...

16. Fabrizio Tavecchio: High-energy emission and particle acceleration in local radio-loud AGNs

02/03/2023, 12:00

High-energy emission from local blazars and radio galaxies is usually explained in terms of particles accelerated at shocks in the relativistic jet. However, in recent years numerical simulations and theoretical studies enlarged the space of possible mechanisms at work. In particular, I will review recent developments on shear acceleration and jet recollimation processes and the potential...

17. A. Costa/A. Sciaccaluga: Simulations of unstable recollimation shocks and Fermi-like particle acceleration

02/03/2023, 12:20

Gli extreme TeV BL Lacs rappresentano una sifda ancora aperta per i modelli standard di emsissione. La Spectral Energy Distribution è caratterizzata da un secondo picco oltre 1 TeV, uno spettro sub-TeV molto ripido e una bassa variabilità temporale, proprietà difficilmente riproducibili utilizzando modelli basati su un singolo shock . Zech & Lemoine (2021) hanno proposto che una serie di shock...

18. Gabriele Bruni: Glowing in the dark: gamma-ray emission from radio lobes, and the emerging population of high-energy radio galaxies

02/03/2023, 12:35

The advent of new all-sky radio surveys such as VLASS, RACS, and LoTSS, performed with the latest generation radio telescopes, is opening new possibilities on the classification and study of extragalactic gamma-ray sources, specially the underrepresented ones like radio galaxies. I will discuss the recent discovery of new gamma-ray radio galaxies from the 4th Fermi/LAT catalogues, among which...

19. Ettore Bronzini: Investigating the high-energy emission in the gamma-ray emitting CSO TXS1146+596

02/03/2023, 12:45

Some of the most intriguing questions about the physics and the evolution of radio galaxies are related to the early stages of their life. The so-called Compacts Symmetric Objects (CSOs), defined to be those with radio lobe on both sides of an active nucleus and an overall size less than ~1 kpc, are thought to represent the first stage in the evolutionary path of radio galaxies. CSOs are...

20. Marco Bondi: High-redshift radio galaxies with the International LOFAR Telescope

02/03/2023, 14:30

During the past year the International LOFAR Telescope (ILT, aka LOFAR-VLBI) data analysis has been greatly improved and refined reaching sub-arcsec resolution imaging at 144 MHz with typical rms values of a few tens of microJy/beam (for an 8-hr observation). The improvement of about a factor of 20 in angular resolution (from 6" of LOFAR to 0".3 of ILT) is fundamental to study the bulk of...

21. Alessandro Capetti: The quest for high-z radio galaxies

02/03/2023, 14:50

High redshift radio galaxies (HzRGs) provide unique diagnostic tools about the conditions in the early Universe. While large samples of radio galaxies (RGs) at low redshift (z <1) are available and their properties have been studied in great detail, our knowledge of high redshift RGs is extremely limited: only a few tens of RGs are known. We recently started a project to select HzRGs ...

22. Tullia Sbarrato: Jets from (cosmic) dawn to noon: how to find the hidden young jets

02/03/2023, 15:00

Radio-loud Active Galactic Nuclei represent about one tenth of the known active supermassive black hole population. The most luminous among them are visible up to extremely high-redshift, thanks to their intrinsic bright and strongly beamed emission. They are generally considered 1:1 tracers of the jetted AGN population, but in the last years this identity revealed to be not always true. The...

23. Cristiana Spingola: The radio VLBI view of the outstanding gamma-ray flare of the lensed blazar PKS 1830-211

02/03/2023, 15:20

We present results from a dense VLBI monitoring of the brightest lensed blazar PKS 1830-211 (z=2.5). Time delays are a primary manifestation of gravitational lensing and they provide one of the most powerful methods to spatially locate the multi-band emitting regions in AGN at high redshift: a difference between the measured radio and the gamma-ray time delays directly implies that the two...

24. CONCLUDING REMARKS (Gabriele Giovannini)

02/03/2023, 16:05