Conveners
Stellar and Intermediate black holes
- Melissa Pesce-Rollins (Istituto Nazionale di Fisica Nucleare)
Stellar and Intermediate black holes
- Melissa Pesce-Rollins (Istituto Nazionale di Fisica Nucleare)
Stellar and Intermediate black holes
- Massimiliano Razzano (Università di Pisa)
Stellar and Intermediate black holes
- Stefano Germani (Istituto Nazionale di Fisica Nucleare)
Stellar and Intermediate black holes
- Stefano Germani (Istituto Nazionale di Fisica Nucleare)
Stellar and Intermediate black holes
- Giuseppe Greco (INFN)
Beginning with GW150914, the LIGO-Virgo-Kagra collaboration observed 90 compact binary coalescences, 11 during the first two observing runs (O1 and O2) and the remaining 79 during the third, O3.
The implications of these observations in physics and astronomy are countless: from tests of general relativity to insights into binary formation and evolution, from multimessenger observations to...
The standard cosmological model is one of the main predictions of General Relativity (GR). Although very successful, the standard cosmological model still suffers some theoretical and observational issues such as the nature of Dark Energy and the H0-tension. Modifications of GR at cosmological scales are a possible avenue to solve these problems. In this talk, I will discuss how...
Starting with the first detection of gravitational waves (GWs) in September 2015, a total of 90 compact binary coalescences (CBCs) have been detected so far by Advanced LIGO and Advanced Virgo, including mergers between BHs, NSs and mixed NS-BHs. These GW observations allowed us to infer some properties of the NS and BH populations, such as the mass and spin distributions and the merger...
The Einstein Telescope (ET) is an ambitious project for the future of multi-messenger astrophysics and the optimisation of the synergy with astronomical facilities is a cardinal point which needs to be addressed. In order to detect the counterparts of binary neutron star (BNS) mergers at high redshift, the observation of high-energy signals will play a crucial role. I will explore the...
Black hole-neutron star binaries are among the least understood population of compact binary coalescences. LIGO-Virgo O3 reported detection of a black hole-neutron star binary, GW200115, along with some candidates. Future observations will definitely deliver a lot of black hole-neutron star binaries, some of which might be accompanied by electromagnetic counterparts. In this talk, I will...
The binary inspirals are only a beginning of a list of potentially
detectable signals. Still undiscovered types of GW radiation include long-
lasting, almost-monochromatic continuous gravitational waves (CWs), whose amplitudes and frequencies evolve much slower, compared to those of transient GW sources. Promising sources of CW are rotating, non-axisymmetric NS, emitting GWs at a frequency...
Our understanding of the formation paths of stellar-mass and intermediate-mass black holes has drastically changed in recent years. In particular, the masses of black hole binaries observed in gravitational waves are challenging existing theories. In this talk I will discuss the main open questions and the prospects of answering them with multi-messenger observations.
The GW170817 event provided the first observation of gravitational waves from a neutron star merger with associated transient counterparts across the entire electromagnetic spectrum. This discovery demonstrated the long-hypothesized association between short gamma-ray bursts and neutron star mergers. More joint detections are needed to explore the relation between the parameters inferred from...
Fast radio bursts (FRBs) are one of the most exciting new mysteries of astrophysics. Their origin is still unknown, but recent observations seem to link them to soft gamma repeaters and, in particular, to magnetar giant flares (MGFs). The recent detection of a MGF at GeV energies by the Fermi Large Area Telescope (LAT) motivated the search for GeV counterparts to the >1000 currently known...
The discovery of a short Gamma-Ray Burst, GRB170817A, in association with a Gravitational
Wave and a bright kilonova started a new era in the high energy astrophysics. The observation
of GRB170817A and more recently, GRB200826A and GRB211211A, a short and a long burst re-
spectively with a possible kilonova, have reinforced the need for new ways of classification. For
this reason, a...
The recent discovery of gravitational waves and high-energy cosmic neutrinos, marked the beginning of a new era of the multimessenger astronomy. These new messengers, along with electromagnetic radiation and cosmic rays, give new insights into the most extreme energetic cosmic events. The detection of gravitational waves from core-collapse supernova explosions is a challenging task, yet to be...
After several decades from their conception kilometric volume neutrino telescopes put the basis for a very-high-energy neutrino astronomy. The samples of astrophysical events detected by the IceCube collaboration show spectral energy distributions compatible with a multicomponent astrophysical origin. While the low energy part of this measured flux can be accounted by the “reservoirs” emission...
We will show a new web tool dedicated to multi-messenger astrophysics both for archival research
and real-time analysis. The web tool is based on the Virtual Observatory (VO) standards permitting
to manage sky localizations in HEALPix (Hierarchical Equal Area isoLatitude Pixelation) format
from various missions.
The application has been developed in accordance with the FAIR (Findability,...
In this presentation I will analyse the coalescence events of compact binary objects, in particular
the mergers of the black hole-neutron star type, with multimessenger approach. Studying the
short Gamma-Ray Burst electromagnetic counterpart I used a recent model to make predictions
about both the synchrotron and synchrotron self-Compton afterglow emission and I will discuss
its possibile...
About one hundred years ago, Edwin Powell Hubble made the first measure of the rate of expansion
of the Universe but still today different techniques of investigation lead to different results. This
dilemma is called Hubble tension and gravitational waves play a key role in its resolution.
The talk focuses on BBH mergers, called dark standard sirens in cosmological applications, and on
the...
The standard gamma-ray burst (GRB) afterglow model is based on the deceleration of an ultra-relativistic jet in the circumburst medium. It predicts a simple power-law decline of multi-wavelength and long-lived emission following the prompt emission. The X-ray Telescope onboard the Neil Gehrels Swift Observatory has discovered several features in the afterglow light curves which deviate from...
Magnetars are neutron stars with the strongest magnetic fields known in the Universe, with an intensity up to a thousand times higher than typical neutron stars. Rarely, magnetars can produce enormous eruptions, called Magnetar Giant Flares (MGF), consisting of short-duration bursts of hard X-rays and soft gamma rays. On April 15, 2020, a short bright burst of MeV gamma rays triggered the...
The discovery of a short Gamma-Ray Burst, GRB170817A, in association with a Gravitational Wave and a bright kilonova started a new era in the high energy astrophysics. The observation of GRB170817A and more recently, GRB200826A and GRB211211A, a short and a long burst respectively with a possible kilonova, have reinforced the need for new ways of classification. For this reason, a procedure...
The standard gamma-ray burst (GRB) afterglow model is based on the deceleration of an ultra-relativistic jet in the circumburst medium. It predicts a simple power-law decline of multi-wavelength and long-lived emission following the prompt emission. The X-ray Telescope onboard the Neil Gehrels Swift Observatory has discovered several features in the afterglow light curves which deviate from...
