Fast Radio Bursts. The chase is on. Sarah Burke Spolaor National Radio Astronomy Observatory
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1 Fast Radio Bursts The chase is on. Sarah Burke Spolaor National Radio Astronomy Observatory with C. Law, G. Bower, B. Butler, P. Demorest, J. Lazio, M. Rupen, many others
2 S P A C E
3 S P A C E f At source f At Earth t t
4 S P A C E f At source f At Earth t t
5 S P A C E f At source Dispersion measure f At Earth t t
6 S P A C E f At source Dispersion measure f At Earth t t
7 S P A C E Scattering and Scintillation Lorimer+Kramer05
8 S P A C E Scattering and Scintillation τ Lorimer+Kramer05 600MHz 400MHz 325MHz 240MHz Our galaxy: τ ~ f 3.8 to -4.4 Lorimer+Kramer05
9 Voilà (FRB) τ f 4.0 ± 0.4 DM = 944 pc/cc dt f ± Thornton+13
10
11 Voilà (FRB) Unknown dispersion contribution Known (Milky Way) dispersion contribution
12 NE2001 electron density model: Cordes & Lazio (2002) FRBs excess dispersion Dispersion excess Repeater (Spitler+16, Scholz+16) Keane+11 Pulsars FRBs
13 NE2001 electron density model: Cordes & Lazio (2002) FRBs excess dispersion Dispersion excess DANGER ZONE! Repeater (Spitler+16, Scholz+16) Keane+11 Pulsars FRBs
14 FRB Distances Intergalactic Medium (IGM) Dispersion Measure contribution (pc/cm 3 ) Inoue (2004) model IGM: 24% He, 76% H Ionization fraction 1.0 All excess attributed to IGM
15 FRB Distances Intergalactic Medium (IGM) Dispersion Measure contribution (pc/cm 3 ) Inoue (2004) model IGM: 24% He, 76% H Ionization fraction % excess attributed to IGM
16 Scattering, dispersing, absorbing, and polarizing media
17 What are they? What can we use them for?
18 Where What are they? What can we use them for?
19 Baryonic census/ Detecting a WHIM Photon mass constraints (Wu+16, Bonetti+16) Cosmic Magnetism (Gaensler+16) Shull+12, Keane+16
20 Baryonic census/ Photon mass constraints Detecting a WHIM Shull+12, Keane+16 (Wu+16, Bonetti+16) Coherent emission processes! Cosmic Magnetism (Gaensler+16) Extreme and rare events! IGM turbulence!
21 Online FRB Catalog: Molonglo: 2 GBT: 1 Arecibo: 1 Parkes: 19 Repeating FRB FRB emitter size limit Single FRBs Pulsars Detected at GHz. About 1 per 10 seconds. Half of them scattered.
22 FRB is somewhere in this region What s Missing? PARKES GBT Molonglo VLA best VLA worst Arecibo VLA
23 What we do know Sky image: Alix Mellinger
24 What we do know Galactic Plane ( b <15º) <800/sky/day High Latitudes ( b >15º) 5000/sky/day Sky image: Alix Mellinger
25 What we do know Dispersion Measure - ne, distance Rotation measure, RM ~ B ne(l)dl - ne, distance, B-field Scattering tail/timescale, τ Scintillation bandwidth, Δf ~ 1/(2 π τ) location and clumpiness of material Scattering index, µ; τ ~ f µ - intervening medium turbulence Polarization fraction (circular, linear) Polarization angle (vs. time) source magnetism Spectral index limits - source, and progenitor absorption/density
26 Masui et al. (2015)
27 Polarization
28
29 Local Environment Limits If too dense / high optical depth Free-free absorption (complete?) Deviation from dt ~ f -2 Drastically-rising spectrum (α > 5) Spectral index limits α(150 MHz) > 0.1 (Karastergiou+15) α(7.5 GHz) < 4.0 (Burke-Spolaor+15) Image credit: ESO Kulkarni et al 2015; Luan & Goldreich 2015; Katz 2015, and others
30 So... What are FRBs?
31 Ask Professor January 2015
32 Theories in the Literature Video: NRAO Two compact things smashing together (e.g. Kashiyama+13, Geng&Huang15, ) Magnetar flares/neutron star pulses (Lyubarsky 2014, Cordes+15, Pen&Connor15, Connor+15) Supernovae-induced NS flares (e.g. Egorov+Postnov 2014) BLITZAR! (Falcke+Rezzolla 2013) Kilonovae (Niino+14) Planet magnetosphere/neutron star interaction (Mottez+Zarka 2014) Quark Novae (Shand+15) Superconducting cosmic strings (Yu+14) Primordial BH evaporation (Keane+12, Rees 1977) Galactic flare stars (Loeb+13, Maoz+15)
33 Summary: Progenitor Constraints Avoid galactic plane z up to ~ a few Emission Region < 180 km TB > 1030 K (COHERENT, NON-THERMAL) Rates 4.4x103 / sky / day (Rane+15) > 103 / Gpc / year > 10-3 / galaxy / year IGM, host + progenitor contributions: must balance RM, DM, f-f absorption, scattering, emission measures of feasible objects 1+ progenitors?
34 The road ahead
35 Strongest paths forward Higher-energy counterparts Host (galaxy) identification Detailed radio properties and statistics
36 In practical terms Real-time detection Localization High detection rates
37 Parkes FRB DM distance: z ~ 0.44 Petroff+15
38 Science Parameter Space
39 at the Jansky VLA 5ms samples 3 x Parkes equivalent collecting area 1 Fast Radio Burst per h on-sky
40 at the VLA 5ms Very Large Array Image!
41 Present: It s only a matter of time! Fluence (Jy ms) Law et al. (2015)
42 What s next for? REAL-TIME PROCESSING (GPUs). Rapid follow-up of localized galaxy COMMENSAL OBSERVING bursts per year?
43 THE CHASE IS ON!
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