Joseph Lazio

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EXECUTIVE SUMMARY Many exciting new astronomical facilities either are being planned or are under construction for operation in the period 2010–2030. Fundamental questions relating to the origin of life, the formation of galaxies, and the structure and evolution of the Universe recur across the science cases of many of these facilities. In this document ,(More)
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar with a rotational period of 2.15 milliseconds in a highly eccentric (e = 0.44) 95-day orbit around a solar mass (M(middle dot in circle)) companion. Infrared(More)
Transient astronomical sources are typically powered by compact objects and usually signify highly explosive or dynamic events. Although high-time-resolution observations are often possible in radio astronomy, they are usually limited to quite narrow fields of view. The dynamic radio sky is therefore poorly sampled, in contrast to the situation in the X-ray(More)
and on behalf of the LWA Consortium. ABSTRACT The Long Wavelength Array (LWA), currently under construction in New Mexico, will be an imaging HF/VHF interferometer providing a new approach for studying the Sun-Earth environment from the surface of the sun to the Earth's ionosphere. The LWA will be a powerful tool for solar physics and space weather(More)
—Future large radio astronomy arrays, particularly the Square Kilometre Array (SKA), will be able to generate data at rates far higher than can be analyzed or stored affordably with current practices. This is, by definition, a "big data" problem, and requires an end-to-end solution if future radio arrays are to reach their full scientific potential. Similar(More)
  • Joseph Lazio, J Burns, U Colorado, L L Demaio, J Jones, Harvard-Smithsonian Kasper +8 others
  • 2007
The Dark Ages Lunar Interferometer (DALI) is a Moon-based radio telescope concept aimed at imaging highly-redshifted neutral hydrogen signals from the first large scale structures forming during the Universe's " Dark Ages " and " Epoch of Reionization. " In the standard hot Big Bang cosmology, the Universe started in an initially dense ionized state. As it(More)
In this document, we revisit the scientific rationale behind the instrumental specifications for the Square Kilometer Array (SKA), and explain the loss of science that would result from various design decisions or cutbacks. A summary of our findings is as follows. • If a large number of pulsars need to be timed over long durations (e.g., years) to detect(More)
Gravitational forces are expected to excite spiral density waves in protoplanetary disks, disks of gas and dust orbiting young stars. However, previous observations that showed spiral structure were not able to probe disk midplanes, where most of the mass is concentrated and where planet formation takes place. Using the Atacama Large(More)