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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

00:12:03

The Mystery of the 21-Minute Pulsar

Multi-messenger astrophysics ·

2024/10/28

Astronomers discovered a new long-period (21-minute) radio transient called GPM J1839–10, with the Murchison Widefield Array (MWA). Follow-up observations were done using other telescopes, including the Australia Telescope Compact Array (ATCA), Parkes/Murriyang radio telescope, the Australian Square Kilometre Array Pathfinder (ASKAP), and MeerKAT. The pulses from GPM J1839–10 vary in brightness, last between 30 and 300 seconds, and have quasiperiodic substructure. Archival data revealed that this

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00:11:53

Microquasar V4641 Sgr: A New Cosmic Ray Source?

Multi-messenger astrophysics ·

2024/10/24

Microquasars, like V4641 Sgr, are binary star systems with a black hole that pulls material from a companion star. They are fascinating objects for astronomers because they can produce jets of relativistic particles. The High-Altitude Water Cherenkov (HAWC) Observatory observed TeV gamma-ray emissions from V4641 Sgr. These observations suggest that the microquasar is accelerating particles far from the black hole, in a region much larger than the binary system itself. It supports the idea that

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00:08:09

LOFAR's Big Catch: A Radio Flash from a Neutron Star...

Multi-messenger astrophysics ·

2024/10/21

Astronomers using LOFAR detected a short, coherent radio flash at 144 MHz, 76.6 minutes after observing a short gamma-ray burst (GRB) called GRB 201006A. The probability of finding an unrelated transient is less than 1 in a million and it is thus likely the radio counterpart to GRB 201006A.The discovery of this radio flash suggests that searches for similar emissions could be helpful for multi-messenger campaigns following neutron star mergers and associated gravitational wave events. Identifying

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00:10:08

Correcting the Narrative: One Collaboration's Fight...

Multi-messenger astrophysics ·

2024/10/18

The paper examines the "Matthew Effect" in science, where more well-known scientists or institutions tend to receive a disproportionate amount of credit for discoveries, even in collaborative efforts. This effect extends to large research collaborations, as demonstrated by the case of the LIGO, Virgo, and KAGRA collaborations. While LIGO, Virgo, and KAGRA have been working together since 2007 and co-author all their gravitational-wave observation papers, the wider scientific community often

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00:10:07

The Pierre Auger Observatory: Unlocking the Secrets...

Multi-messenger astrophysics ·

2024/10/17

Ultra-high-energy cosmic rays (UHECRs) are a mystery. Scientists still don’t know where or how they are created. A new study combines three kinds of data measured at the Auger Observatory: the energy spectrum, shower maximum depth distributions, and arrival directions of UHECRs. Publication: A.A. Halim et al., "Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger

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00:11:48

GRB 201216C: MAGIC Detects Farthest GRB at VHE energies

Multi-messenger astrophysics ·

2024/10/16

GRB 201216C, a long GRB, was observed by numerous instruments, including Swift-BAT, Fermi-GBM, and the MAGIC telescopes. MAGIC detected GRB 201216C at a redshift of z = 1.1, making it the farthest known source detected at VHE gamma rays. Modeling of GRB 201216C's multiwavelength data, including the MAGIC observations, favors a scenario where the GRB jet is expanding into a wind-like medium shaped by the progenitor star. This is consistent with the observed light curves and SEDs. Publication: H

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00:07:59

Unveiling Galactic PeVatrons with Gamma Rays and...

Multi-messenger astrophysics ·

2024/10/15

This episode explores the search for Galactic PeVatrons, powerful cosmic accelerators that boost cosmic rays to PeV energies (1 PeV = 10^15 eV). The study, conducted by researchers using the HAWC gamma-ray observatory and the IceCube Neutrino Observatory, focuses on identifying neutrino emission from known gamma-ray sources. The study focused on 22 gamma-ray sources detected by HAWC. The researchers first used HAWC data to create a detailed spatial and spectral model for each gamma-ray source. They

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00:10:55

Pulsar Timing Arrays and Gravitational Waves

Multi-messenger astrophysics ·

2024/10/14

Millisecond pulsars (MSPs) are incredibly stable rotators and can be used as extremely precise clocks. Pulsar Timing Arrays (PTAs) monitor a collection of these pulsars to detect gravitational waves (GWs). GWs affect the arrival times of pulses from these pulsars, causing tiny, correlated fluctuations. There are four main PTAs: The European Pulsar Timing Array (EPTA) combines data from five major European radio telescopes and the synthesized Large European Array for Pulsars (LEAP). The Indian

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00:10:07

Binary Neutron Star Mergers: The Source of Ultra-High...

Multi-messenger astrophysics ·

2024/10/11

This paper proposes that binary neutron star mergers are the source of ultrahigh energy cosmic rays (UHECRs). The authors argue that these mergers produce jets with nearly universal maximum rigidities, explaining the observed narrow range of rigidities in UHECRs. The paper also explains how the rate of these mergers, the power of their jets, and the production of heavy nuclei like tellurium during the merger process all contribute to the observed properties of UHECRs. The authors also predict that

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00:09:15

Supernova 2023ixf

Multi-messenger astrophysics ·

2024/10/10

SN 2023ixf provided the earliest ever detection of shock breakout from a supernova. The red supergiant progenitor star had a radius of about 440 solar radii. Early observations revealed that the light curves evolved very rapidly (timescales of 1-2 hours), appearing fainter and redder than models predicted. The study authors attribute this to an optically thick dust shell surrounding the star that was destroyed as the shockwave passed through. Based on the best fit models, the study authors conclude

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00:10:05

Tiling the Sky for Multi-Messenger Astronomy

Multi-messenger astrophysics ·

2024/10/09

Description: Tilepy is an open-source platform revolutionizing multi-messenger astrophysics by optimizing the scheduling of follow-up observations for events with large sky localization uncertainties, such as gravitational waves, gamma-ray bursts, and high-energy neutrinos. Main Points ● What is Tilepy? Tilepy is a Python package designed to efficiently schedule observations by correlating galaxy distributions with 3D localization information and optimizing observation strategies across the

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00:09:28

Unveiling the Secrets of the BOAT (GRB 221009A)

Multi-messenger astrophysics ·

2024/10/08

Episode Title: Unveiling the Secrets of the BOAT (GRB 221009A) Description: Explore the awe-inspiring power and scientific significance of GRB 221009A, the brightest gamma-ray burst ever recorded. Join us as we unpack the observations from multiple telescopes, including Fermi-LAT, LHAASO, and H.E.S.S., to understand the mechanisms behind this extraordinary event. Key Talking Points: Unprecedented Brightness: We'll discuss how GRB 221009A's brightness caused a Bad Time Interval (BTI) for the

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00:13:06

A New Era of Gamma-Ray Burst Astronomy

Multi-messenger astrophysics ·

2024/10/07

Shownotes for a Podcast Episode: Unprecedented Energy in Gamma-Ray Bursts Topic: A New Era of Gamma-Ray Burst Astronomy Introduction: Gamma-ray bursts (GRBs) are brief, intense flashes of gamma-ray radiation originating from distant galaxies. They are the most powerful explosions known in the universe. These bursts occur in two distinct phases: the prompt emission, a short, bright burst of gamma rays, and the afterglow, a longer-lasting emission spanning various wavelengths. While GRB

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00:06:51

Introduction to Astro-COLIBRI

Multi-messenger astrophysics ·

2024/10/06

Astro-COLIBRI is a platform designed for real-time exploration of extreme astronomical events, facilitating multi-messenger astrophysics research. The platform offers a user-friendly interface and state-of-the-art architecture, enabling astronomers worldwide to identify and observe events across various timescales. Astro-COLIBRI has been used in several research projects and has been featured in various publications, including articles by the SETI Institute and CNET. The platform also hosts

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74 results

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