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PODCAST

Multi-messenger astrophysics

Discussions around tools and discoveries in the novel domain of multi-messenger and time domain astrophysics. We"ll highlight recent publications, discuss tools to faciliate observations and generally talk about the cool science behind the most violent explosions in the universe.

science astronomy

All Episodes

00:21:49

A Glimpse into the Early Universe with FRB 20240304B

Multi-messenger astrophysics ·

2025/08/07

Join us as we explore the groundbreaking discovery of FRB 20240304B, the most distant Fast Radio Burst (FRB) ever detected, offering unprecedented insights into the early universe.In this episode, we discuss:• What are Fast Radio Bursts (FRBs)? These enigmatic, millisecond-duration radio signals provide unique information about the plasma permeating our universe, revealing details about magnetic fields and gas distributions.• The Record-Breaking Discovery: FRB 20240304B was detected by the MeerKAT

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00:16:38

Einstein Telescope + WST: Spectroscopy's Role in the...

Multi-messenger astrophysics ·

2025/07/10

In this episode, we dive into the exciting future of **multi-messenger astronomy**, specifically focusing on the detection and characterization of binary neutron star (BNS) mergers.* **The Dawn of Multi-Messenger Astrophysics:** Our understanding of cosmic events was revolutionized by the extraordinary joint detection of gravitational waves (GWs) and light from a BNS merger on August 17, 2017 (GW170817). This single event confirmed theoretical hypotheses about short gamma-ray bursts (SGRBs)

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00:16:00

The Muon Puzzle: IceCube's Quest for Cosmic Ray Clues

Multi-messenger astrophysics ·

2025/07/01

Dive into the fascinating world of cosmic rays with the latest research from the IceCube Neutrino Observatory! This episode explores new measurements of high-energy muons in extensive air showers, shedding light on the mysterious mass composition of cosmic rays and the challenges of simulating their interactions in Earth's atmosphere.**What we discuss:*** **Measuring High-Energy Muons:** Learn about the first measurement of the **mean number of muons with energies above 500 GeV** in

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00:23:46

X-Ray Clues to Cosmic Rays: The Discovery of a...

Multi-messenger astrophysics ·

2025/06/24

Join us as we dive into the latest astronomical discovery! Scientists have identified a **new candidate pulsar wind nebula (PWN)**, named XMMU 034124.2+525720, which may be directly linked to **1LHAASO J0343+5254u**, a powerful "PeVatron" in our galaxy.**What are PeVatrons?** They are the most energetic astrophysical objects in our galaxy, producing cosmic rays (CRs) with energies exceeding 1 PeV (10^15 eV), far surpassing what terrestrial accelerators can achieve. Understanding them is

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00:15:46

Cosmic Clash: LHAASO's Proton-Gamma Ray Mystery

Multi-messenger astrophysics ·

2025/06/17

In this episode, we dive into a fascinating new study that performs the **first direct consistency check** between two crucial measurements from the Large High Altitude Air Shower Observatory (LHAASO): the **cosmic-ray (CR) proton spectrum at the "knee"** and the **Galactic diffuse gamma-ray emission**.The "knee" in the cosmic ray spectrum (around a few PeV) is thought to mark the maximum energy reached by Galactic CR accelerators. Diffuse gamma-ray emission, primarily from CR

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00:29:55

Magnetars, Supernovae, and FRBs: A Delayed Connection?

Multi-messenger astrophysics ·

2025/06/12

In this episode, we dive into the mysterious world of Fast Radio Bursts (FRBs) and the ongoing quest to understand their origins. We discuss a systematic search for **past supernovae (SNe) and other historical optical transients** at the positions of FRB sources, exploring a leading theory that links FRBs to **magnetars**.The study **found no statistically significant associations** within the 5σ FRB localization uncertainties between the observed CHIME-KKO or literature FRBs and optical transients,

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00:21:02

Beyond Fermi: LST-1 Detects Geminga Pulsar Down to 20...

Multi-messenger astrophysics ·

2025/06/03

In this episode, we discuss a significant new detection of the Geminga pulsar, a middle-aged, radio-quiet gamma-ray pulsar. The **Large-Sized Telescope (LST-1)**, the first of the Cherenkov Telescope Array Observatory (CTAO) Northern Array, has detected Geminga at energies down to 20 GeV.Key takeaways from the study:* The LST-1 detected the Geminga pulsar using 60 hours of data.* The **second emission peak (P2)** of Geminga was detected with a high significance of **12.2σ** in the energy range

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00:11:01

The 44-Minute Pulsar ASKAP J1832−0911 seen in radio...

Multi-messenger astrophysics ·

2025/05/29

Astronomers have made a significant discovery, detecting X-ray emission from a rare type of cosmic object known as a **Long-Period Radio Transient (LPT)** for the very first time.The object, designated **ASKAP J1832−0911**, is extraordinarily bright in radio, reaching flux densities of 10–20 Jy.Crucially, it exhibits **coincident radio and X-ray emission**, both pulsing with a regular period of **44.2 minutes** (2,656.2412 seconds in radio, 2,634 seconds in X-rays). This combination of properties –

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00:16:33

Challenging the Models: New Fermi-LAT Insights into...

Multi-messenger astrophysics ·

2025/05/14

A recent study utilized **15 years of observations** from the **Fermi Large Area Telescope (LAT)** to analyze the gamma-ray emission from the Sun in its quiet state, meaning when it's not flaring. This is the first study to separately analyze the flux variation of the two distinct components of this quiet-state gamma-ray emission over solar cycles.According to theoretical understanding, the Sun's steady-state gamma-ray emission arises from interactions with Galactic cosmic rays (CRs). There

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00:08:01

PeV Power from Stellar Explosions: The Role of Dense...

Multi-messenger astrophysics ·

2025/05/03

The research investigates **how supernovae exploding into dense circumstellar environments, specifically those with dense shells of material, can potentially accelerate particles to energies of a few PeV**, thus acting as "PeVatrons" and contributing to the "knee" feature in the cosmic ray spectrum.Supernova remnants (SNRs) have long been considered prime candidates for the sources of Galactic Cosmic Rays (CRs) up to energies of a few PeV. However, despite decades of gamma-ray

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00:22:32

The HAWC Observatory peering into the Extreme...

Multi-messenger astrophysics ·

2025/03/31

The research presents **new observations of the gamma-ray binary system LS 5039 using the High Altitude Water Cherenkov (HAWC) observatory**, revealing significant insights into the nature of this high-energy source.One of the most striking findings is that **HAWC detected gamma rays from LS 5039 extending up to 200 TeV with no apparent spectral cutoff**. This is a crucial extension of previous observations by the High Energy Stereoscopic System (H.E.S.S.), which had observed the system up to TeV

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00:27:35

Fast X-ray Bursts and Their Optical Surprises: The...

Multi-messenger astrophysics ·

2025/03/27

* EP241021a was discovered as a soft X-ray trigger but was not detected at gamma-ray frequencies.* The prompt soft X-ray emission spectrum is consistent with **non-thermal radiation**, suggesting a **mildly relativistic outflow with a bulk Lorentz factor Γ≳ 4**.* The optical and near-infrared light curve shows a **two-component behavior**: an initial fading component (∼ t⁻¹) followed by a **rapid rise (steeper than ∼ t⁴)**, peaking at an absolute magnitude of **Mr ≈−22 mag**, before quickly

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00:21:52

Hunting FRBs at high energy with AGILE

Multi-messenger astrophysics ·

2025/03/24

**Introduction:**What are Fast Radio Bursts (FRBs)? These millisecond bursts from distant galaxies have astrophysicists intrigued. We explore repeating FRBs (R-FRBs) and theories about their origins, including magnetars.**AGILE's High-Energy Hunt:**The Italian AGILE satellite, with its SuperAGILE (18-60 keV), MCAL (0.35-100 MeV), and GRID (0.03-50 GeV) detectors, searched for X- and gamma-ray counterparts to a sample of R-FRBs.**The Search and Non-Detection:**AGILE observed several bursts from

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00:31:43

Gravitational Waves 3.0: Science with the Einstein...

Multi-messenger astrophysics ·

2025/03/21

Welcome to this episode about the **Einstein Telescope (ET)**, a planned **third-generation gravitational-wave observatory** [see source].* **ET will revolutionize gravitational-wave astronomy** with **higher sensitivity** and a **broader frequency range** compared to current detectors [see source].* This allows deeper insights into **Fundamental Physics** (tests of General Relativity, search for dark matter), **Cosmology** (more precise Hubble constant measurement, early Universe studies), and

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00:13:23

Beyond Milliseconds and Minutes: ASKAP Unveiling...

Multi-messenger astrophysics ·

2025/03/17

* **Introduction:** Astronomers have discovered a new celestial object, PSR J0311+1402, a radio pulsar with an unusual spin period of **41 seconds**. This discovery bridges the gap between normal pulsars (millisecond to seconds) and long-period radio transients (LPTs) (minutes to hours).* **The Discovery:** PSR J0311+1402 was first detected by the **Australian Square Kilometre Array Pathfinder (ASKAP)** during commissioning tests of the CRACO system in January 2024. It exhibited pulses with a

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00:12:31

Cosmic Rays and the Hunt for Ultra-High-Energy...

Multi-messenger astrophysics ·

2025/02/27

**Introduction*** The podcast discusses the search for **diffuse photons** with energies above tens of PeV, using data from the **Pierre Auger Observatory**.* These photons are produced by interactions between cosmic rays and interstellar matter or background radiation.* The measurement of a diffuse photon flux can help us understand the distribution of cosmic rays in the Galaxy and probe models of super-heavy dark matter.**The Pierre Auger Observatory*** The observatory uses a surface detector

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00:16:28

When Neutrinos Don't Point the Way: A Blazar Mystery

Multi-messenger astrophysics ·

2025/02/24

**Introduction:*** This episode discusses the search for the sources of high-energy neutrinos using the example of the blazar B3 2247+381.* The IceCube Neutrino Observatory detects astrophysical neutrinos, and scientists are working to find their origins by looking for correlations between neutrino alerts and electromagnetic radiation from objects like blazars.**The IceCube Alert and B3 2247+381:*** IceCube detected a multiplet of muon neutrino events, which appeared to be coming from the

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00:18:23

Cosmic Messengers: Exploring the Origins of KM3-230213A

Multi-messenger astrophysics ·

2025/02/19

**Introduction:*** A recent ultra-high-energy neutrino event, named KM3-230213A, was detected by the KM3NeT/ARCA detector.* This event has sparked interest in the scientific community, as its origin is still unclear.* The neutrino's high energy suggests it may have come from a very powerful cosmic source.* The event was detected on February 13, 2023.* The podcast explores two potential origins for this neutrino event: galactic sources and cosmogenic neutrinos.**Galactic Origin:*** The

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00:12:54

Tension in the Neutrino Sky: The KM3NeT Event vs....

Multi-messenger astrophysics ·

2025/02/18

**Introduction*** A recent detection by the KM3NeT/ARCA telescope of an ultra-high-energy neutrino, named KM3-230213A, is discussed. This event has an estimated energy in the hundreds of PeV, surpassing previous observations by the IceCube Neutrino Observatory.* The observed neutrino's high energy suggests an astrophysical origin, as it's unlikely to be from atmospheric sources.**Key Concepts*** The study explores the compatibility of the KM3NeT event with previous data from IceCube and

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00:17:05

Deep Sea Discovery: KM3NeT Detects Record-Breaking...

Multi-messenger astrophysics ·

2025/02/17

* **Introduction**: A recent groundbreaking discovery by the KM3NeT Collaboration has detected an exceptionally high-energy cosmic neutrino. This event, named KM3-230213A, is significant because its energy far exceeds any neutrino previously observed.* **What are Cosmic Neutrinos?**: Cosmic neutrinos are electrically neutral particles that travel vast distances without being deflected by magnetic fields or significantly absorbed by matter. They are produced when cosmic rays interact with matter or

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74 results

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