Fast Radio Bursts (facts and speculations) Duncan Lorimer Dept. of - - PowerPoint PPT Presentation

▶
fast radio bursts
SMART_READER_LITE
LIVE PREVIEW

Fast Radio Bursts (facts and speculations) Duncan Lorimer Dept. of - - PowerPoint PPT Presentation

May 09, 2023 311 likes •519 views

Fast Radio Bursts (facts and speculations) Duncan Lorimer Dept. of Physics and Astronomy C r e d West Virginia University i t : S w i n What do we observe? b u r n e How are they found? What could they be? Why are

slide-1
SLIDE 1

– What do we observe? – How are they found? – What could they be? – Why are they important? – What are we doing? – My bold predictions!

Fast Radio Bursts

(facts and speculations)

C r e d i t : S w i n b u r n e

Duncan Lorimer

  • Dept. of Physics and Astronomy

West Virginia University

slide-2
SLIDE 2
  • 1+1+4+1+1=8 published
  • Peak flux > 0.5 Jy
  • L-band (1.4 GHz)
  • Highly dispersed
  • Pulse widths > few ms
  • Evidence for scattering
  • Singular events?
  • Different sky locations
  • No counterparts so far

From Thornton et al. (2013)

What is

  • bserved?
slide-3
SLIDE 3

FRB l b DM Width Flux 010724 300

  • 42

375 4.6 30 010621 25

  • 4

746 8.3 0.4 110220 51

  • 55

944 5.6 1.3 110703 81

  • 59

1104 1.4 0.5 110627 356

  • 42

723 4.3 0.4 120127 49

  • 66

553 1.1 0.5 121002 308

  • 26

1628 2 / 4 0.4 121102 175

  • 0.2

557 3 0.4

Obligatory table of numbers

slide-4
SLIDE 4

Compared to pulsar DMs

LMC SMC 47Tuc ???

slide-5
SLIDE 5

Compared to pulsar DMs

C r e d i t : J i m C

  • r

d e s

slide-6
SLIDE 6

How are they found?

C r e d i t : m y w i f e

slide-7
SLIDE 7

Example search-code output

slide-8
SLIDE 8

Bright events are easily visualized

slide-9
SLIDE 9

Faint events are harder to see

C r e d i t : S c

  • t

t R a n s

  • m
slide-10
SLIDE 10

What could they be?

C r e d i t : J

  • P

M a c q u a r t Black: Parkes; Pink: SKA1-lo; Grey: SKA1-mid

slide-11
SLIDE 11

What could they be?

  • Local

– Atmospheric Peryton idea

(Kulkarni et al. 2014)

  • Extra-terrestrial

–Alien signals

(Luan & Goldreich 2014)

  • Galactic

–Flare stars

(Loeb et al. 2014)

  • Extragalactic

– Favored cosmic catastrophe

(Cobbly et al. 2014)

slide-12
SLIDE 12
  • Collapsing neutron stars
  • Evaporating black holes
  • Coalescing neutron stars
  • Coalescing white dwarfs
  • Magnetar flares
  • Supernovae
  • Giant pulses
  • Cosmic strings...

Desperately need counterparts

Extragalactic source possibilities

slide-13
SLIDE 13

(assuming that they are extragalactic)

  • Measure the distance → origins
  • Measure the intergalactic DM
  • Measure turbulence in IGM
  • Probe missing baryons and DE
  • Measure the intergalactic B-field
  • Probe population at different redshifts

What can we do with 'em?

slide-14
SLIDE 14

Probing the missing baryons

C r e d i t : M c Q u i n n ( 2 1 4 )

slide-15
SLIDE 15

FRBs as cosmic rulers

C r e d i t : Z h

  • u

e t a l ( 2 1 4 )

slide-16
SLIDE 16

What next?

C r e d i t : S p i t l e r e t a l . ( 2 1 4 , i n p r e s s )

  • Find bursts with other telescopes
slide-17
SLIDE 17
  • Find bursts with other telescopes
  • Find them at different frequencies

What next?

slide-18
SLIDE 18

Scattering in FRB 110220

C r e d i t : T h

  • r

n t

  • n

e t a l . 2 1 3

slide-19
SLIDE 19
  • Find bursts with other telescopes
  • Find them at different frequencies
  • Do as much as possible with existing ones

What next?

  • Find bursts with other telescopes

Bannister & Marsden (2014)

slide-20
SLIDE 20
  • Searching archival data
  • Follow-up on existing bursts
  • Realtime detectors on large/small dishes
  • Staring at the sky with interferometers

What are people doing Bold predictions

  • 2015: counterparts found
  • 2020: 100s FRBs found
  • 2025: 1000s of FRBs known
  • 2030: FRBs essential cosmological tools