Fast Radio Bursts with HIRAX Jeff Peterson FRB 110523 McWilliams Center for Cosmology Carnegie Mellon University, PiDsburgh PA USA First HIRAX The Lorimer Burst, 2007 Six-Meter Dish Built at CMU, tested at Durban SA
The Lorimer Burst (2006) • Found in a pulsar search of archived data from Parkes
CharacterisWcs of Previous Bursts (11) -Peak Flux ~ 1 Jansky -Highly dispersed -Pulse width few ms -Three FRB have scaDering tail -LocaWon precision: 15 arcmin. -Not concentrated in GalacWc plane -Rate ~ 2500 sky^-1 day^-1 -All but one detected with Parkes -Two events found at same poinWng -These events have different dispersion -No counterparts idenWfied at other wavelengths Thornton etal 2013
Recent news: Five new bursts at Parkes, Arecibo burst repeats Double peak Coming soon: several Bursts found with MOST Champion etal
FRB sources are very likely outside of the Milky Way Blue: pulsar Green: FRB Red: FRB110523
If FRB are at z~1 they have excepWonal brightness temperature Credit: J-P Macquart Black: Parkes; Pink: SKA1-lo; Grey: SKA1-mid
FRB proposed models Merging Supernovae Magnetars Black Holes Super-giant Pulses Evaporating Black Holes extra-Galactic Gamma-ray Bursts Galactic Flare stars SETI Pernicious RFI Atmospheric effects A well-coordinated hoax “Blitzars” We are here Pulsars Slide by J Hessels
HIRAX: The Hydrogen Intensity and Real-Wme Analysis eXperiment • Primary Science Goal: Probe Dark Energy models using a 21-cm Intensity Mapping BAO test • Sec Goal: – Find and sharply localize – Hundreds of FRBs
Also a Thrash Metal Band
Collaborators UKZN: Sievers, Moodley, Chiang, Hilton, Poole • Stellenbosch: Brink • UCT: Woudt, Taylor • Rhodes: Smirnov • UWC: Santos, Maartens, Dave • AIMS: Basset • DUT: Van Vuuran, Macpherson • Carnegie-Mellon: Peterson, Lin, Kung • U Wisconsin: Timbie Gayley • ASIAA: Chang • IUCAA: Gupta, Srianand • APC Paris: Ganga, Bucher • NRAO: Ransom • Oxford: Karastergiou • HDU (China): Zhi-Ping Chen • Yale: Newburgh • Toronto: Lokhorst • Various CHIME Canadians •
Current HIRAX Plan • 1024 close-packed 6m dishes at Karoo site. • KIS--No tracking, no cryogenics, commodity dishes. • Dishes Wlt N/S by hand: when “deep enough” on a strip, Wlt over to increase f sky . • Operate between 400-800 MHz • Channelizing on FPGA ICE boards (MaD Dobbs) • CorrelaWon on GPUs. • Plan to do beamforming in correlator, distribute beams for FRB processing. • Outrigger arrays in Botswana and Namibia to localize FRBs
Status • Funded to build 128 element at Klerefontein • Proposal in SA under review to expand to 512 • Plan to submit NSF MRI proposal for the final 512 elements • 4 Element pathfinder in place at HartRAO • Ten dishes in transit • Use to verify performance of RF system, RFOF, Channelizer, beamformer, correlator, RealWme FRB search.
Tests at HartRAO PA102 PA102 PARF0input101 PARF0input201 PARF0input101 COC7 COR1 COC3 COC11 COC4 COR5 COC13 PAC402 PAC401 PAC702 PAC701 PAC301 PAC302 COR4 PAR502 PAC1301 PAC1101 PAC902 PAC2001 PAC2101 PAC2101 PAC2201 PAC1001 PAC1601 PAC1101 PAC1201 PAC2301 PAC701 PAC1301 PAC1401 PAC901 PAC2301 PAC1501 PAC301 PAC2201 PAC801 PAC2001 PAC601 COI1 PAC1102 COR7 PAC901 CORF0input1 PAR101 PAR102 PAR401 PAR402 PAR501 PAC1501 PAC1502 PAC1302 PAC2002 PAC2202 PAC1302 PAC1602 PAC1002 PAC1102 PAC1202 PAC802 PAC702 PAC1402 PAC1502 PAC602 PAC302 PAC2302 PAC2302 PAC2202 PAC2002 PAC902 PAI101 PAC101 PAI302 PAI502 PAR1102 PAR1202 PAR702 PAR902 PAR1202 PAR702 COC9 PAC2102 PAC2102 COC17 COR12 COR8 COC20 PAU1016 PAU1016 PAU1015 PAU1015 PAU1014 PAU1014 PAU1013 PAU1013 COU1 COC15 COC22 COC23 PAI102 PAC102 PAI301 PAI501 PAC1701 PAC1702 PAR1201 PAR1101 PAR1201 PAR901 PAR701 PAR801 PAR802 PAR701 PATR106 PATR106 PATR101 PATR101 PA100 PA101 COC21 Newer design: LNA at feed antenna terminals à PAU101 PAU101 PAU1017 PAU1017 PAU1012 PAU1012 COI5 PAU102 PAU102 PAU1011 PAU1011 PATR105 PATR105 PATR102 PATR102 PAC1901 PAC1902 PA101 COC2 COC1 COI3 COI4 COI6 CO1 PAU103 PAU103 PAU1010 PAU1010 PAC1801 PAC1802 PAR1001 PAR1002 PAI202 PAC1802 PAC502 PAC202 PAC102 PAC202 PAC1702 PAC1902 PAC402 PAI401 PAU104 PAU104 PAU109 PAU109 PAI601 PAI401 PAI601 PAI101 PAI301 PAI501 PAI201 PAR901 PAR1101 PATR104 PATR104 PATR103 PATR103 COC19 PAU105 PAU105 PAU106 PAU107PAU108 PAU106 PAU107 PAU108 COC16 COR9 PAI201 PAC401 PAC1801 PAC201 PAC1901 PAC501 PAC101 PAC201 PAC1701 PAI402 PAI602 PAI502 PAI202 PAI102 PAI602 PAI402 PAI302 COC18 PAR902 COR10 PAR1102 COC10 COTR1 PAR201 PAR202 PAR301 PAR302 PAR601 PAR101 PAR801 PAR201 PAR401 PAR1001 PAR601 PAR301 PAR501 PAC1601 PAC1602 PAC1402 PAC1202 COR11 PAC1001 CORF0input2 COI2 PAC502 PAC501 PARF0input201 PAC802 PAC801 PAC601 PAC602 PAR602 PAR802 PAR102 PAR402 PAR1002 PAR502 PAR202 PAR602 PAR302 PAC1401 PAC1201 PAC1002 COR3 COR6 COC14 COC5 COC8 COR2 COC6 COC12
10 six-meter dishes on the boat to Durban
Laser-cut dish ribs at Durban
Outriggers • Central array makes iniWal FRB detecWon • Central array and outriggers streaming amplitudes to disk… but deleWng aler few hours • On candidate alert: amplitudes files are saved for all arrays • Carry out aperture synthesis HIRAX Outrigger 25 dishes imaging using know DM, Wme and formed-beam 100 km • Provides a sub arc second error ellipse for most FRBs Small Outriggers allow arcsecond localizaWon Outrigger of each FRB 25 dishes
Science Possible with HIRAX-FRB • Fast Radio Bursts: 30,000 m^2 collecWng area w/ 1000 beams allows detecWon of >10 FRB/day. • Pulsar search: Pulsars spend 20 min in beam each day--12 µJy/scan • Site allows pulsar search in GalacWc Center. • Neutral hydrogen and OH absorbers: Req’s Higher frequency resoluWon in beam-formed data (with a few FFTs on GPUs). • Diffuse polarizaWon of galaxy. • Other ideas?
Thinking BIG: Specs and FRB event rate for a future array • 4028 elements, 10 m aperture on-axis close packed. Plus two outrigger arrays…$30M • 4028 instantaneous dual-pol beams • EffecWve area 150,000 m^2…40 x GBT, 62 x CHIME. 4 x FAST (but twice Tsys of GBT or FAST) • Gain 80 K/Jy • FRB rate: 19,000 /day -> one every 5 sec • MulW-octave feed? Wider correlator bandwidth? • What other science does this enable?
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