Multi-messenger astrophysics14 Loka 2024

Pulsar Timing Arrays and Gravitational Waves

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 Pulsar Timing Array (InPTA), focusing on low-frequency observations, uses data from the upgraded Giant Metrewave Radio Telescope (GMRT).
The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) utilizes data from the Arecibo Observatory, Green Bank Telescope, Very Large Array, and the Canadian Hydrogen Intensity Mapping Experiment (CHIME).
The Parkes Pulsar Timing Array (PPTA) in Australia employs the Parkes radio telescope

The most recent PTA data sets have yielded promising results. They have all detected CRN and the PPTA, NANOGrav, EPTA, and InPTA have found evidence of quadrupolar correlations in this noise, suggesting the presence of a GW background. This is a major step towards a definitive GW detection and opens up exciting possibilities for understanding the universe through GWs in the nanohertz frequency range.

Publication: J. Verbiest et al., "Status Report on Global Pulsar-Timing-Array Efforts to Detect Gravitational Waves", arXiv:2404.19529

Acknowledgements: Image credit: David J. Champion. Podcast created by Google/NotebookLM

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(101)

Record-Breaker: Catching Gamma Rays from the Distant Quasar OP 313

In this episode, we dive into a groundbreaking astronomical discovery: the detection of very-high-energy (VHE) gamma rays from the quasar OP 313. Located at a redshift of $z = 0.997$, OP 313 has shatt...

1 Kesä 20min

Ripples in Spacetime: Unpacking the GWTC-5.0 Catalog

In this episode, we dive into the monumental release of the Gravitational-Wave Transient Catalog version 5.0 (GWTC-5.0) and the open data from the second part of the fourth observing run (O4b) by the ...

29 Touko 21min

SN 2017egm : Fermi-LAT's Breakthrough Gamma-Ray Detection

In today’s episode, we dive into the mystery of superluminous supernovae (SLSNe)—rare, extreme astronomical events that shine 10 to 100 times brighter than standard core-collapse supernovae. For years...

22 Touko 23min

Supernovae on the RISE: Why Dead Stars Wake Up Decades Later

In this episode, we explore the fascinating phenomenon of core-collapse supernovae that refuse to fade away quietly. Years, or even decades, after their initial explosion, some of these stellar deaths...

20 Touko 17min

The SVOM Satellite: A New Era in Multi-Messenger Astronomy

In this episode, we dive into the fascinating world of gamma-ray bursts (GRBs) and high-energy transients through the lens of the SVOM (Space-based Multi-band Variable Object Monitor) mission. Launche...

29 Huhti 24min

Chasing the Flash: Hunting Neutron Star Mergers with CTAO

In this episode, we dive into the thrilling world of multi-messenger astronomy! Ever since the historic detection of GW170817, scientists have known that binary neutron star (BNS) mergers can produce ...

14 Huhti 19min

Tiling the Sky: A New Strategy for Finding Elusive GRBs

In this episode, we dive into the intense and fast-paced world of **Gamma-ray bursts (GRBs)—the most luminous and rapidly evolving transients in the Universe**. While space-based instruments like the ...

13 Huhti 19min

Fast Radio Bursts & Magnetar X-Rays: A Peculiar Discovery

In this episode, we dive into the deep cosmos to explore a recent astronomical breakthrough linking Fast Radio Bursts (FRBs)—enigmatic, millisecond-long cosmic transients—to extreme stellar objects kn...

7 Huhti 22min