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Canadian Hydrogen Intensity Mapping Experiment
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is an interferometric radio telescope at the Dominion Radio Astrophysical Observatory in British Columbia, Canada which consists of four antennas consisting of 100 x 20 metre cylindrical parabolic reflectors with 1024 dual-polarization radio receivers suspended on a support above them. The antenna receives radio waves from hydrogen in space at frequencies in the 400–800 MHz range. The telescope's low-noise amplifiers are built with components adapted from the cellphone industry and its data processed using a custom-built FPGA electronic system and 1000-processor high-performance GPGPU cluster. The telescope has no moving parts and observes half of the sky each day as the Earth turns.
It has also turned out to be a great instrument for observing fast radio bursts (FRBs).
CHIME is a partnership between the University of British Columbia, McGill University, the University of Toronto and the Canadian National Research Council's Dominion Radio Astrophysical Observatory. A first light ceremony was held on 7 September 2017 to inaugurate the commissioning phase.
One of the biggest puzzles in contemporary cosmology is why the expansion of the Universe is accelerating. About seventy percent of the Universe today consists of dark energy that counteracts gravity's attractive force and causes this acceleration. Very little is known about what dark energy is. CHIME is in the process of making precise measurements of the acceleration of the Universe to improve the knowledge of how dark energy behaves. The experiment is designed to observe the period in the Universe's history during which the standard ΛCDM model predicts that dark energy began to dominate the energy density of the Universe and when decelerated expansion transitioned to acceleration.
CHIME will make other observations in addition to its main, cosmological purpose. CHIME's daily survey of the sky will enable study of the Milky Way galaxy in radio frequencies, and is expected to improve the understanding of galactic magnetic fields.
CHIME will also help other experiments to calibrate measurements of radio waves from rapidly spinning neutron stars, which researchers hope to use to detect gravitational waves.
CHIME is being used for discovering and monitoring pulsars and other radio transients; a specialised instrument was developed for these science objectives. The telescope monitors 10 pulsars at a time around the clock to watch for variation in their time-keeping that might indicate a passing gravitational wave. CHIME is able to detect the mysterious extragalactic fast radio bursts (FRBs) that last just milliseconds and have no well established astrophysical explanation.
The instrument is a hybrid semi-cylindrical interferometer designed to measure the large scale neutral hydrogen power spectrum across the redshift range 0.8 to 2.5. The power spectrum will be used to measure the baryon acoustic oscillation (BAO) scale across this redshift range where dark energy becomes a significant contributor to the evolution of the Universe.
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Canadian Hydrogen Intensity Mapping Experiment
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is an interferometric radio telescope at the Dominion Radio Astrophysical Observatory in British Columbia, Canada which consists of four antennas consisting of 100 x 20 metre cylindrical parabolic reflectors with 1024 dual-polarization radio receivers suspended on a support above them. The antenna receives radio waves from hydrogen in space at frequencies in the 400–800 MHz range. The telescope's low-noise amplifiers are built with components adapted from the cellphone industry and its data processed using a custom-built FPGA electronic system and 1000-processor high-performance GPGPU cluster. The telescope has no moving parts and observes half of the sky each day as the Earth turns.
It has also turned out to be a great instrument for observing fast radio bursts (FRBs).
CHIME is a partnership between the University of British Columbia, McGill University, the University of Toronto and the Canadian National Research Council's Dominion Radio Astrophysical Observatory. A first light ceremony was held on 7 September 2017 to inaugurate the commissioning phase.
One of the biggest puzzles in contemporary cosmology is why the expansion of the Universe is accelerating. About seventy percent of the Universe today consists of dark energy that counteracts gravity's attractive force and causes this acceleration. Very little is known about what dark energy is. CHIME is in the process of making precise measurements of the acceleration of the Universe to improve the knowledge of how dark energy behaves. The experiment is designed to observe the period in the Universe's history during which the standard ΛCDM model predicts that dark energy began to dominate the energy density of the Universe and when decelerated expansion transitioned to acceleration.
CHIME will make other observations in addition to its main, cosmological purpose. CHIME's daily survey of the sky will enable study of the Milky Way galaxy in radio frequencies, and is expected to improve the understanding of galactic magnetic fields.
CHIME will also help other experiments to calibrate measurements of radio waves from rapidly spinning neutron stars, which researchers hope to use to detect gravitational waves.
CHIME is being used for discovering and monitoring pulsars and other radio transients; a specialised instrument was developed for these science objectives. The telescope monitors 10 pulsars at a time around the clock to watch for variation in their time-keeping that might indicate a passing gravitational wave. CHIME is able to detect the mysterious extragalactic fast radio bursts (FRBs) that last just milliseconds and have no well established astrophysical explanation.
The instrument is a hybrid semi-cylindrical interferometer designed to measure the large scale neutral hydrogen power spectrum across the redshift range 0.8 to 2.5. The power spectrum will be used to measure the baryon acoustic oscillation (BAO) scale across this redshift range where dark energy becomes a significant contributor to the evolution of the Universe.