When Did the First Stars Form?
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cosmology↗
Engineering topics
Lazio, Joseph
Publications and source records attributed to Lazio, Joseph.
Lunar Science
Lunar Laser Ranging will provide critical data to determine the initial composition of the Moon and the Earth-Moon system. Specifically, LLR uniquely measures the properties of the lunar core via librations. LUNAR is advancing LLR: APOLLO recovery of Lunokhod 1, thus dramatically improving measurements of librations; Technology development of next generation retroreflectors; New drilling techniques. Dual-use Low Frequency Radio arrays will constrain: Lunar ionosphere density via riometry; Nano-size interplanetary dust particles responsible for surface weathering.
lunar laser ranging↗
Electromagnetic Counterparts to LIGO-VIRGO Events: Expanded Very Large Array Observations
No abstract available
gravitational wave astronomy↗
Search for Electromagnetic Counterparts to LIGO-Virgo Candidates: Expanded Very Large Array Observations
This paper summarizes a search for radio wavelength counterparts to candidate gravitational wave events. The identification of an electromagnetic counterpart could provide a more complete understanding of a gravitational wave event, including such characteristics as the location and the nature of the progenitor. We used the Expanded Very Large Array (EVLA) to search six galaxies which were identified as potential hosts for two candidate gravitational wave events. We summarize our procedures and discuss preliminary results.
methods↗
The Square Kilometer Array Massive Data Challenges at the Frontiers of Astronomy, Physics, & Astrobiology
No abstract available
global radio wavelength observaotry↗
The Square Kilometre Array
The Square Kilometre Array (SKA) will be the premier instrument to study radiation at centimetre and metre wavelengths from the cosmos, and in particular neutral hydrogen, the most abundant element in the universe. The SKA will probe the dawn of galaxy formation as well as allow advances in many other areas of astronomy, such as fundamental physics, astro-biology and cosmology. The SKA will have a collecting area of up to one million square metres spread over at least 3000 km, providing a collecting area more than twenty times greater than the current largest radio telescope. Its field of view on the sky will be several tens of square degrees with potentially several large (100 square degrees) independent beams at the lower frequencies, providing a survey speed many thousands of times greater than current facilities. This paper summarises the key science drivers of the SKA and provides an update on the international project.
interferometers↗
Science with the Square Kilometre Array
The Square Kilometre Array (SKA) is the centimeter- and meter-wavelength telescope for the 21st Century. Its Key Science Projects are (a) The end of the Dark Ages, involving searches for an H i signature and the first metalrich systems; (b) Testing theories of gravitation using an array of pulsars to search for gravitational waves and relativistic binaries to probe the strong-field regime; (c) Observations of H i to a redshift z ~ 2 from which to study the evolution of galaxies and dark energy. (d) Astrobiology including planetary formation within protoplanetary disks; and (c) The origin and evolution of cosmic magnetism, both within the Galaxy and in intergalactic space. The SKA will operate over the wavelength range of at least 1.2 cm to 4 m (70 MHz to 25 GHz), providing milliarcsecond resolution at the shortest wavelengths.
cosmic microwave↗