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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

00:27:35

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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00:12:31

The Mystery of ANITA: Investigating Anomalous Radio...

Multi-messenger astrophysics ·

2025/02/14

The Mystery of ANITA: Investigating Anomalous Radio Pulses with the Pierre Auger Observatory* **Introduction**: The Antarctic Impulsive Transient Antenna (ANITA) has detected some unusual radio pulses that don't fit with the standard model of particle physics. These "anomalous" pulses, which appear to come from below the horizon, could potentially be caused by air showers developing in an upward direction. This podcast discusses a search using the Pierre Auger Observatory to either

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00:14:11

Cosmic Messengers: IceCube's Hunt for Extremely...

Multi-messenger astrophysics ·

2025/02/11

* **Introduction:** This episode discusses the search for extremely-high-energy neutrinos (EHEν) using 12.6 years of data from the IceCube Neutrino Observatory. EHEνs are unique messengers from the distant universe, traveling without being deflected by magnetic fields or attenuated by interactions with background photons.* **IceCube Detector:** The IceCube detector, located at the South Pole, consists of 5160 Digital Optical Modules (DOMs) distributed on 86 strings, instrumenting a cubic kilometer

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00:17:53

Mapping the Invisible Universe: New Connections...

Multi-messenger astrophysics ·

2025/01/31

**Article Reference:*** Thakore, B., et al. (2024). "High-Significance Detection of Correlation Between the Unresolved Gamma-Ray Background and the Large Scale Cosmic Structure." **Introduction:** * The universe is filled with a mysterious glow of gamma rays, known as the **unresolved gamma-ray background (UGRB)**. This background could contain clues about the faintest gamma-ray sources and the nature of dark matter. * This podcast episode explores a recent study that has found a significant

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00:12:50

Hunting for Orphan Afterglows: The Story of AT2019pim

Multi-messenger astrophysics ·

2025/01/29

Introduction: This episode discusses the groundbreaking discovery of AT2019pim, the first spectroscopically confirmed afterglow of a relativistic explosion with no observed high-energy gamma-ray emission. This event challenges our understanding of gamma-ray bursts (GRBs) and suggests the existence of "orphan afterglows," which are afterglows not associated with typical GRB prompt emission. The discovery was serendipitous, occurring during follow-up observations of a gravitational-wave

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00:16:32

Beyond Mergers: Exploring Magnetars as R-process...

Multi-messenger astrophysics ·

2025/01/27

**Reference:** Patel et al., "Direct evidence for r-process nucleosynthesis in delayed MeV emission from the SGR 1806-20 magnetar giant flare" (2025) * **Introduction:** * The origin of heavy elements, specifically those formed through the rapid neutron-capture process (**r-process**), has been a long-standing mystery in astrophysics. * While neutron star mergers have been considered a primary site, evidence suggests additional sources are needed to explain the observed

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00:15:59

AAS2RTO: Taming the Transient Data Deluge from LSST

Multi-messenger astrophysics ·

2025/01/24

* **Introduction:*** The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will soon produce an unprecedented amount of transient astronomical data, with around 10 million alerts every night. * This data deluge requires intelligent tools to prioritize the most scientifically valuable events for follow-up, especially spectroscopic observations. * This podcast discusses AAS2RTO, a new tool designed to address this challenge. * Reference: Sedgewick et al. (2025)

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00:10:01

The Quest for Continuous Gravitational Waves: What...

Multi-messenger astrophysics ·

2025/01/21

* **Introduction**:* This episode discusses the search for continuous gravitational waves (CWs) emitted by neutron stars, specifically known pulsars, using data from the LIGO-Virgo-KAGRA (LVK) collaboration's fourth observing run (O4a). * CWs are distinct from transient gravitational waves (GWs) like those from black hole mergers; they are nearly monochromatic signals with small variations over long periods. * **Detecting CWs can provide insights into the internal structure of

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00:21:51

Decoding Blazars: The Markarian Multiwavelength Data...

Multi-messenger astrophysics ·

2025/01/18

**Introduction:*** This episode discusses the **Markarian Multiwavelength Data Center (MMDC)**, a new web-based tool designed to access and model multiwavelength data from blazar observations. * MMDC is designed to enhance blazar research by providing a comprehensive framework for data accessibility, analysis, and theoretical interpretation. * The tool integrates archival data, optical data from all-sky surveys, and newly analyzed datasets in optical/UV, X-ray, and high-energy γ-ray bands. *

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00:18:35

Twelve Years of IceCube Data Unveil New Insights into...

Multi-messenger astrophysics ·

2024/12/20

* This study uses data from the IceCube Neutrino Observatory, a massive detector at the South Pole, to study cosmic rays.* The IceCube detector is primarily designed to detect high-energy neutrinos. However, it also collects a large amount of data on cosmic-ray muons. * Muons are created when cosmic rays collide with the Earth's atmosphere. * By studying the arrival directions of these muons, scientists can learn about the anisotropy of cosmic rays, meaning the variations in their arrival

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00:13:26

The Search for Orphan Gamma-Ray Bursts with...

Multi-messenger astrophysics ·

2024/12/17

* Orphan gamma-ray burst (GRB) afterglows occur when the gamma-ray emission from a GRB is not directed towards Earth, making the initial burst invisible. However, the afterglow, produced by the interaction of the GRB's blast wave with surrounding material, can be observed.* Studying orphan afterglows provides valuable insights into GRB physics and their progenitors, and can enhance multi-messenger analyses with gravitational waves. * The Vera C. Rubin Observatory, with its exceptional sensitivity

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00:13:08

A persistent radio source to FRB 20240114A: A Peek...

Multi-messenger astrophysics ·

2024/12/13

Fast Radio Bursts (FRBs) are brief, powerful pulses of radio waves originating from distant galaxies. Their origins are still a mystery, with one leading theory pointing to magnetars, highly magnetized neutron stars, as the source. Astronomers have identified a small number of FRBs that emit repeated bursts, termed repeating FRBs (rFRBs). A subset of rFRBs have a persistent radio source (PRS) associated with them. PRSs are continuous sources of radio waves, distinct from the burst emission. The

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63 results

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