Conveners
Parallel - Galaxy Evolution & AGN: High density environments
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Evolution & AGN: Galaxy dynamics, ISM, galaxy scaling relations
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Evolution & AGN: AGN physics and duty cycle
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Evolution & AGN: Radio surveys & Galaxy evolution
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Evolution & AGN: Discussion
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Evolution & AGN: Joint Discussion with Galaxy Clusters and Magnetism
- Rossella Cassano (Istituto Nazionale di Astrofisica (INAF))
- Valentina Vacca (Istituto Nazionale di Astrofisica (INAF))
- Isabella Prandoni (Istituto Nazionale di Astrofisica (INAF))
- Paolo Serra (Istituto Nazionale di Astrofisica (INAF))
Deep, wide-field radio continuum observations of galaxy clusters are revealing an increasing number of spiral galaxies hosting tens of kiloparsec-long radio tails produced by the displacement of the nonthermal interstellar medium (ISM) by ram pressure. In this context, I will present a semi-empirical model for the multifrequency radio continuum emission from ram-pressure-stripped tails based...
HI morphology continues to be a prime tracer of the interaction between galaxies and their environment. I will describe a number of recent and ongoing projects led by INAF researchers, where HI imaging is used to study galaxy quenching inside clusters. These projects include: a blind HI survey of the Coma cluster; HI imaging of jellyfish galaxies as part of GASP; blind HI observations of...
I will describe the ViCTORIA (Virgo Cluster multi Telescope Observations in Radio of Interacting galaxies and AGN) project, a blind survey of the Virgo cluster undertaken with MeerKAT at 21 cm. The survey covers the cluster up to ~ 1 R_200 (60 sq. deg.) and has a sensitivity of ~ 0.6 mJy/beam at 11 km/s and 12x27 arcsec angular resolution. This survey is providing us with a unique set of HI...
The MeerKAT Fornax Survey has successfully observed the central part of the Fornax cluster with an unprecedented sensitivity and resolution. Reaching a MHI sensitivity of ~10$^6$M$_☉$, these data allow us to investigate the low HI mass population of the Fornax cluster.
By analysing deep VST optical images from the Fornax Deep Survey, it is now clear that some of the low-mass HI detections do...
Radio observations of the HI emission line at 21 cm have been pivotal to establish the dark matter (DM) problem in galaxies, and remain a key tool to test LCDM models of galaxy formation as well as alternative gravitational theories. The HI disk of galaxies typically extends further out than the stellar component, so one can measure extended rotation curves out to large radii, where the DM...
Thanks to MeerKat and the SKA-MID generation, HI is getting accessible at higher z, making it possible to explore galaxy scaling relations involving gas mass at z > 0. Probing the evolutionary path of such relations would allow to understand how cold hydrogen reservoirs impact star formation and galaxy evolution. Recent works exploiting stacking of the 21 cm line with the MIGHTEE survey...
We present preliminary results from a HI stacking experiment at 0.2<z<0.5 from the MIGHTEE survey. To complement our studies on main-sequence star-forming galaxies,
we are now interested in statistically comparing the HI gas content in the passive population at similar cosmic epochs, in order to further constrain this un-explored phase of the baryon cycle.
We study in particular the ...
The accretion-ejection mechanism acting in Active Galactic Nuclei (AGN) is one of the main astrophysical open issues, being connected to the role of AGN feedback in galaxy formation evolution studies. Radio Quiet AGN constitute the large majority of radio sources in the sky. The absence of luminous jets allows us to investigate their radio emission originating from a wide range of possible...
The advent of new generation radio telescopes is opening new possibilities on the classification and study of extragalactic high-energy sources, specially the underrepresented ones like radio galaxies. Among these, Giant Radio Galaxies (GRG, larger than 0.7 Mpc) are among the most extreme manifestations of the accretion/ ejection processes on supermassive black holes. Our recent studies have...
Hotspots are bright and compact regions at the edge of powerful radio galaxies which represent the working surface of the supersonic jets produced by an AGN. Their radio to X-ray synchrotron emission proves that particle acceleration is highly efficient in shocks developing hundred-kpc away from the central engine, with particles accelerated to Lorentz factors >10^6-10^7. Moreover, the...
Theoretical models predict that the inner part of blazar jets is the site
in which particle acceleration takes place and high-energy neutrinos are produced. The high angular resolution observations with the very long baseline interferometer (VLBI) provide crucial tests for the association of neutrinos with blazars. The interest of the multi-messenger community in blazars as possible neutrino...
Active Galactic Nuclei (AGN) are one of the prime drivers of galaxy evolution. It is thought they are triggered by the accretion of cold gas from the interstellar medium (ISM) onto the SMBH. Yet, which processes regulate the gas accretion (feeding) onto the SMBH is unknown, as are the processes that alter the physical conditions of the ISM (feedback), and ultimately change the star formation...
LOFAR has proved to be one on the most successful SKA pathfinder in the
Northern emisphere opening up a poorly investigated radio window
providing observations with unprecedented sensitivity and resolution,
in particular with the addition of the International Stations.
During the past year the International LOFAR Telescope (ILT, aka
LOFAR-VLBI) data analysis has been greatly improved and...
The Serendipitous H-ATLAS fields Observations of Radio Extragalactic Sources (SHORES), led by Principal Investigator Marcella Massardi, is a 2.1 GHz radio survey conducted with the Australia Telescope Compact Array (ATCA). Spanning 30 fields, totalling 15 square degrees in the Herschel-ATLAS Southern Galactic Pole region, SHORES achieves a sensitivity of up to 50 μJy at 5 $\sigma$ in the...
Co-evolutionary models between supermassive black holes and their host galaxies predict that processes involved in the early stages of galaxy formation, such as nuclear activity and star formation, are closely related and coordinated in time. Dusty Star-Forming Galaxies (DSFGs) serve as ideal testing grounds for examining this scenario, as they constitute the bulk population at the peak of...
Obscured Active Galactic Nuclei (AGN) are the largest population of
accreting supermassive black holes. The demographics of the most
heavily obscured nuclei, however, is still largely uncertain,
especially at early cosmic times, where they may dominate the whole
AGN statistics.
A promising way to select heavily obscured AGN is through their radio
emission, which is largely unaffected...
Observations of the interstellar medium (ISM) are key to deciphering the physical processes regulating star formation in galaxies, one of the main drivers of galaxy evolution. The mechanisms that transform the overall galactic gas content into stars, such as gas accretion and outflows, control star formation in typical nearby galaxies.
Only a large and coherent dataset of all components of...
