Astro Seminar - "An ultra-long period magnetar with periodic radio emission"

Natasha Hurley-Walker (Curtin University)

Sep 14, 2021 3:30 PM
Location: Virtual Seminar
Astro Seminar

Title: An ultra-long period magnetar with periodic radio emission

Abstract:

Most known neutron stars have been detected via periodic radio or X-ray signals correlated with their rotational period, which are generated either by a conversion of a fraction of their spin-down dipole radiation (pulsars) or twisting and/or reorganisation of their intense magnetic fields (magnetars). The known population typically rotates with periods of milliseconds to tens of seconds, but it is postulated that there exists an older, much more slowly-rotating neutron star population, which are thought to no longer generate emission. These “ultra-long period” (ULP) magnetars are candidate progenitors for Fast Radio Bursts, which themselves are now being localised to positions incompatible with young magnetars (e.g. globular clusters). ULP magnetars would explain many of the emission characteristics of FRBs, such as the quasi-periodic windows of emission, but were thought to be impossible to observe directly.

We have made the first direct detection of a ULP magnetar, using a low-frequency radio sky survey performed by the Murchison Widefield Array. Its emission is highly polarised and periodic on a timescale of ~20 minutes. Its dynamic spectrum shows high-fluence narrow-timescale “spikes” which are unresolved by our data, with fluence on par with FRBs generated by the Galactic centre magnetar. I will highlight the object’s main observational features, including its window of appearance, dispersion measure, polarisation attributes, and changes in its pulse profile over time. Along with X-ray and optical observations, these features have allowed us to constrain its physical attributes such as location in the Galaxy, radio luminosity, and likely magnetic field strength. I will conclude with a population estimate and thoughts on how we might best detect further examples, and follow them up to determine if they generate FRBs.


More about Natasha Hurley-Walker ⇒


Choose an Academic Year:

Past Events

MSI Seminar - "Tracing the building blocks of planet formation through protoplanetary discs"

James Owen (Imperial College London)

Oct 26, 2021 2:30 PM
Location: Virtual Seminar
MSI Seminar
Read More ⇒

Planet Lunch

Oct 21, 2021 12:00 PM
Other, Weekly Event
Read More ⇒

EPOD Discussion

Oct 20, 2021 2:00 PM
Other Event
Read More ⇒

Astro Seminar - "Constraining the history of reionization with quasar absorption lines"

Laura Keating (Leibniz Institute for Astrophysics Potsdam)

Oct 19, 2021 1:00 PM
Location: Virtual Seminar - YouTube LIVE
Astro Seminar
Read More ⇒

Planet Lunch

Oct 14, 2021 12:00 PM
Other, Weekly Event
Read More ⇒

EPOD Discussion

Oct 13, 2021 2:00 PM
Other Event
Read More ⇒

Planet Lunch

Oct 7, 2021 12:00 PM
Other, Weekly Event
Read More ⇒

EPOD Discussion

Oct 6, 2021 2:00 PM
Other Event
Read More ⇒

An Evening with Webb: Canadian Astronomers Using the Next Great Space Telescope

Oct 5, 2021 7:30 PM
Location: YouTube Live
Virtual Panel
Read More ⇒

MSI Seminar - "Modelling stellar cluster populations alongside their host galaxies in a cosmic environment"

Marta Reina-Campos (McMaster University)

Oct 5, 2021 3:30 PM
Location: Virtual Seminar
MSI Seminar
Read More ⇒

Planet Lunch

Sep 30, 2021 12:00 PM
Other, Weekly Event
Read More ⇒

EPOD Discussion

Sep 29, 2021 2:00 PM
Other Event
Read More ⇒

Astro Seminar - "Planets are Places: Characterization of Other Worlds in the 2020s and Beyond"

Laura Kreidberg (MPIA)

Sep 28, 2021 3:30 PM
Location: Virtual Seminar
Astro Seminar
Read More ⇒

Planet Lunch

Sep 23, 2021 12:00 PM
Weekly, Other Event
Read More ⇒

Talking with Martians: A panel on red-planet research

Erin Gibbons, Debarati Das, Richard Léveillé (McGill University)

Sep 22, 2021 7:00 PM
Livestream
Read More ⇒

EPOD Discussion

Sep 22, 2021 2:00 PM
Other Event
Read More ⇒

MSI Seminar - "Small Circumbinary Planets: Do They Exist And How Do We Find Them?"

David Martin (Ohio State University)

Sep 21, 2021 3:30 PM
Location: Virtual Seminar
MSI Seminar
Read More ⇒

MSI Jamboree 2021

MSI Postodcs & Faculty (MSI)

Sep 20, 2021 3:00 PM to 5:00 PM
Location: Zoom
Other Event
Read More ⇒

EPOD Discussion

Sep 15, 2021 2:00 PM
Other Event
Read More ⇒

Astro Seminar - "An ultra-long period magnetar with periodic radio emission"

Natasha Hurley-Walker (Curtin University)

Sep 14, 2021 3:30 PM
Location: Virtual Seminar
Astro Seminar
Read More ⇒

EPOD Discussion

Sep 8, 2021 2:00 PM
Other Event
Read More ⇒

MSI Seminar - "Gravitational Wave Sources at the Hearts of Galaxies"

Smadar Naoz (UCLA)

Sep 7, 2021 3:30 PM
Location: YouTube Live
MSI Seminar
Read More ⇒

EPOD Discussion

Sep 1, 2021 2:00 PM
Other Event
Read More ⇒

MSI & Physics Summer Undergraduate Research Showcase

Aug 30, 2021 1:00 PM
Other Event
Read More ⇒