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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

00:12:31

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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00:23:09

The Enigma of G35.6−0.5: Supernova, HII Region, or...

Multi-messenger astrophysics ·

2024/12/10

The discovery of a new ultra-high-energy gamma-ray source, 1LHAASO J1857+0203u, by the Large High Altitude Air Shower Observatory (LHAASO) suggests the presence of a PeVatron, a cosmic accelerator capable of boosting particles to peta-electron volt energies. This source is particularly interesting because it is located in a region with complex multi-wavelength features, including the supernova remnant (SNR) G35.6−0.4 and the HII region G35.6−0.5.The study, published in "An Enigmatic PeVatron in an

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00:12:43

Searching for Nanosecond Optical Transients with the...

Multi-messenger astrophysics ·

2024/12/08

The TAIGA-HiSCORE Cherenkov array, located in Siberia, is a unique instrument designed to study cosmic rays and gamma rays. However, scientists have realized that it can also be used to search for a variety of fascinating astronomical phenomena, including nanosecond optical transients.What are nanosecond optical transients? These are extremely short bursts of light that last for only a few nanoseconds. The source of these transients is unknown, but there are several intriguing possibilities:

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00:20:22

Beyond the GW Horizon: Hunting for Kilonovae with KNTraP

Multi-messenger astrophysics ·

2024/12/03

Kilonovae (KNe) are bright, rapidly fading astronomical events believed to be caused by the radioactive decay of heavy elements produced during the merger of neutron stars or a neutron star and a black hole.While there are several candidate KNe events observed in association with short gamma-ray bursts (GRBs), there is only one confirmed KN associated with a gravitational wave (GW) event, AT2017gfo, detected in 2017. The Kilonova and Transients Program (KNTraP) is a new survey project using the

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00:14:31

Unveiling the Milky Way's Hidden Glow: Diffuse Gamma...

Multi-messenger astrophysics ·

2024/11/28

In this episode, we explore the fascinating world of diffuse gamma rays emanating from the Galactic plane. A new study using the Large High Altitude Air Shower Observatory's Water Cherenkov Detector Array (LHAASO-WCDA) has provided unprecedented insights into these mysterious emissions.What are diffuse gamma rays? These high-energy photons are produced when cosmic rays, energetic particles that constantly bombard our galaxy, interact with interstellar gas and radiation. Studying these gamma rays

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00:10:54

Cosmic Coincidence? Exploring the Gamma-Ray Flare...

Multi-messenger astrophysics ·

2024/11/15

Publication: arXiv:2411.06996Acknowledements: Podcast prepared with Google/NotebookLM. Illustration credits: Y. Xing et al. (arXiv:2411.06996)

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00:09:07

Unlocking the Muon Puzzle with IACTs

Multi-messenger astrophysics ·

2024/11/12

IACTs (Imaging Atmospheric Cherenkov Telescopes) are typically used for gamma-ray astronomy. Muons are produced in hadronic showers and IACTs can detect these muons, which are normally considered background noise. The information from these muons can be used to study cosmic ray showers. One way to study cosmic rays is by observing the muon lateral distribution, which is the muon density as a function of the distance from the shower core. Another way is by determining the muon slant height, which is

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00:11:47

Cosmic Magnetism: How the Milky Way Bends the Path of...

Multi-messenger astrophysics ·

2024/11/07

Ultra-high-energy cosmic rays (UHECRs) are the most energetic particles ever detected, with energies exceeding 10^18 eV. Their origin remains a mystery, as their paths are deflected by magnetic fields in space, making it difficult to trace them back to their sources. Scientists use models of the Galactic magnetic field (GMF) to account for these deflections and try to pinpoint the sources of UHECRs. A recent study used a new suite of GMF models called UF23, which provides a more accurate

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00:10:45

Swift's Continuous Commanding: Enabling New...

Multi-messenger astrophysics ·

2024/11/04

Swift's New Capability: Continuous CommandingA new capability of the Neil Gehrels Swift Observatory, called "continuous commanding", allows Swift to respond to targets of opportunity within 10 seconds. This capability allows Swift to receive commands in real-time because the spacecraft is now constantly in contact with the ground. This capability was developed to allow Swift to respond to early warning gravitational wave detections. Specifically, it will allow Swift to point the Burst Alert

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00:09:16

Ultra-High-Energy Photons: Unlocking the Secrets of...

Multi-messenger astrophysics ·

2024/10/31

The Pierre Auger Observatory, situated in Argentina, is designed to detect UHE cosmic rays. The observatory is also sensitive to UHE photons and has been used to search for photons from various sources. This study looked for coincidences between UHE photon events and a selection of GW events detected by the LIGO/Virgo observatories. No UHE photon events were observed in coincidence with any of the selected GW events. This is the first study to place limits on UHE photon emission from GW

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74 results

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