HIRAX: a probe of dark energy and radio transients

The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400{800MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on a compact grid and will map most of the southern sky over the course of four years. HIRAX has two primary science goals: to constrain Dark Energy and measure structure at high redshift, and to study radio transients and pulsars. HIRAX will observe unresolved sources of neutral hydrogen via their redshifted 21-cm emission line (`hydrogen intensity mapping'). The resulting maps of large-scale structure at redshifts 0.8{2.5 will be used to measure Baryon Acoustic Oscillations (BAO). BAO are a preferential length scale in the matter distribution that can be used to characterize the expansion history of the Universe and thus understand the properties of Dark Energy. HIRAX will improve upon current BAO measurements from galaxy surveys by observing a larger cosmological volume (larger in both survey area and redshift range) and by measuring BAO at higher redshift when the expansion of the universe transitioned to Dark Energy domination. HIRAX will complement CHIME, a hydrogen intensity mapping experiment in the Northern Hemisphere, by completing the sky coverage in the same redshift range. HIRAX's location in the Southern Hemisphere also allows a variety of cross-correlation measurements with large-scale structure surveys at many wavelengths. Daily maps of a few thousand square degrees of the Southern Hemisphere, encompassing much of the Milky Way galaxy, will also open new opportunities for discovering and monitoring radio transients. The HIRAX correlator will have the ability to rapidly and efficiently detect transient events. This new data will shed light on the poorly understood nature of fast radio bursts (FRBs), enable pulsar monitoring to enhance long-wavelength gravitational wave searches, and provide a rich data set for new radio transient phenomena searches. This paper discusses the HIRAX instrument, science goals, and current status.

[1]  Naoyuki Tamura,et al.  Prime focus instrument of prime focus spectrograph for Subaru telescope , 2014, Astronomical Telescopes and Instrumentation.

[2]  P. A. R. Ade,et al.  SPT-3G: a next-generation cosmic microwave background polarization experiment on the South Pole telescope , 2014, Astronomical Telescopes and Instrumentation.

[3]  Meiling Deng,et al.  The cloverleaf antenna: A compact wide-bandwidth dual-polarization feed for CHIME , 2014, 2014 16th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM).

[4]  Daniel Thomas,et al.  The clustering of galaxies in the sdss-iii baryon oscillation spectroscopic survey: Baryon acoustic oscillations in the data release 9 spectroscopic galaxy sample , 2012, 1312.4877.

[5]  Kevin Bandura,et al.  Hydrogen 21-cm Intensity Mapping at redshift 0.8 , 2010, 1007.3709.

[6]  Martin Leung.  A wideband feed for a cylindrical radio telescope , 2008 .

[7]  Matias Zaldarriaga,et al.  Precision calibration of radio interferometers using redundant baselines , 2010, 1001.5268.

[8]  D. Stinebring,et al.  The International Pulsar Timing Array project: using pulsars as a gravitational wave detector , 2009, 0911.5206.

[9]  David Alonso,et al.  Cosmology with a SKA HI intensity mapping survey , 2015, 1501.03989.

[10]  R. Nichol,et al.  The Dark Energy Survey: more than dark energy - an overview , 2016, 1601.00329.

[11]  Kevin Bandura,et al.  A Radio-Frequency-over-Fiber link for large-array radio astronomy applications , 2013, 1308.5481.

[12]  E. R. Switzer,et al.  MEASUREMENT OF 21 cm BRIGHTNESS FLUCTUATIONS AT z ∼ 0.8 IN CROSS-CORRELATION , 2012, 1208.0331.

[13]  Philip Bull,et al.  LATE-TIME COSMOLOGY WITH 21 cm INTENSITY MAPPING EXPERIMENTS , 2014, 1405.1452.

[14]  E. Nakar,et al.  The electromagnetic signals of compact binary mergers , 2012, 1204.6242.

[15]  Peter Klages,et al.  A GPU-based correlator X-engine implemented on the CHIME Pathfinder , 2015, 2015 IEEE 26th International Conference on Application-specific Systems, Architectures and Processors (ASAP).

[16]  Ashley J. Ross,et al.  The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the correlation function of LOWZ and CMASS galaxies in Data Release 12 , 2015, 1509.06371.

[17]  Brad E. Tucker,et al.  A 2.4% DETERMINATION OF THE LOCAL VALUE OF THE HUBBLE CONSTANT , 2016, 1604.01424.

[18]  Edward J. Wollack,et al.  Advanced ACTPol Cryogenic Detector Arrays and Readout , 2015, 1510.02809.

[19]  David Schlegel,et al.  The DESI Experiment, a whitepaper for Snowmass 2013 , 2013, 1308.0847.

[20]  E. R. Switzer,et al.  Determination of z ∼ 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation , 2013, 1304.3712.

[21]  L. Raul Abramo,et al.  Why multitracer surveys beat cosmic variance , 2013, 1302.5444.

[22]  P. Hopkins,et al.  MUFASA: Galaxy Formation Simulations With Meshless Hydrodynamics , 2016, 1604.01418.

[23]  Ue-Li Pen,et al.  Cosmic tidal reconstruction , 2015, 1511.04680.

[24]  John D. Bunton,et al.  The Australian SKA Pathfinder , 2012, Other Conferences.

[25]  A. Amara,et al.  Beam Calibration of Radio Telescopes with Drones , 2015, 1505.05885.

[26]  Adam D. Myers,et al.  Baryon acoustic oscillations in the Lyα forest of BOSS DR11 quasars , 2014, 1404.1801.

[27]  Liam Connor,et al.  Constraints on the FRB rate at 700-900 MHz , 2016, 1602.07292.

[28]  Peter Klages,et al.  GPU kernels for high-speed 4-bit astrophysical data processing , 2015, 2015 IEEE 26th International Conference on Application-specific Systems, Architectures and Processors (ASAP).

[29]  S. Siegel,et al.  ICE: a scalable, low-cost FPGA-based telescope signal processing and networking system , 2016, 1608.06262.

[30]  Scot S. Olivier,et al.  Large Synoptic Survey Telescope: Dark Energy Science Collaboration , 2012 .

[31]  Roberto Gilmozzi,et al.  Ground-based and Airborne Telescopes VII , 2008 .

[32]  A. Ganguly,et al.  Dense magnetized plasma associated with a fast radio burst , 2015, Nature.

[33]  Graeme Smecher,et al.  Canadian Hydrogen Intensity Mapping Experiment (CHIME) pathfinder , 2014, Astronomical Telescopes and Instrumentation.

[34]  Edward J. Wollack,et al.  THE ATACAMA COSMOLOGY TELESCOPE: THE POLARIZATION-SENSITIVE ACTPol INSTRUMENT , 2016, The Astrophysical Journal Supplement Series.

[35]  R. Laureijs,et al.  Euclid: ESA's mission to map the geometry of the dark universe , 2012, Other Conferences.

[36]  Peter Klages,et al.  An efficient real-time data pipeline for the CHIME Pathfinder radio telescope X-engine , 2015, 2015 IEEE 26th International Conference on Application-specific Systems, Architectures and Processors (ASAP).

[37]  Edward J. Wollack,et al.  Wide-Field InfraRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA Final Report , 2013, 1305.5422.

[38]  J. Ruze,et al.  The effect of aperture errors on the antenna radiation pattern , 1952 .

[39]  The Ligo Scientific Collaboration,et al.  GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence , 2016, 1606.04855.

[40]  David Alonso,et al.  Fast simulations for intensity mapping experiments , 2014, 1405.1751.

[41]  Patrick McDonald,et al.  How to evade the sample variance limit on measurements of redshift-space distortions , 2009 .

[42]  Ue-Li Pen,et al.  Coaxing cosmic 21 cm fluctuations from the polarized sky using m -mode analysis , 2014, 1401.2095.