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New Study Shows That Binaries From Globular Clusters Can be Detected by LISA

The European Space Agency's next-generation Laser Interferometer Space Antenna (LISA) gravitational wave detector can potentially detect dozens of binary files in the globular clusters of the Milky Way, scientists say.

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In particular, these models suggest that the Kuiper Belt -- a cold region beyond the orbit of Neptune -- should contain a small fraction of rocky bodies from the inner solar system, such as carbon-rich asteroids, referred to as carbonaceous asteroids.
representational image, pixabay

The European Space Agency’s next-generation Laser Interferometer Space Antenna (LISA) gravitational wave detector can potentially detect dozens of binary files in the globular clusters of the Milky Way, scientists say.

Globular clusters are dense environments containing millions of tightly packed stars and are efficient factories for gravitational wave sources.

LISA, which is expected to be in space in 2034, will be able to detect binary sources — pairs of orbiting compact objects.

These binary sources will contain all combinations of black hole, neutron star and white dwarf components.

While 150 globular clusters have been observed so far in the Milky Way, one out of every three clusters will produce a LISA source.
Representational image. Pixabay

LISA will also be sensitive to gravitational waves of a lower frequency than those detected by the Earth-bound Laser Interferometer Gravitational-Wave Observatory (LIGO)

“LISA is sensitive to Milky Way systems and will expand the breadth of the gravitational wave spectrum, allowing us to explore different types of objects that aren’t observable with LIGO,” said lead author Kyle Kremer, a doctoral student at the Northwestern University in Illinois, US.

While 150 globular clusters have been observed so far in the Milky Way, one out of every three clusters will produce a LISA source.

Approximately eight black hole binaries will be detectable by LISA in our neighbouring galaxy of Andromeda and another 80 in nearby Virgo, the study showed.

The research, published by the journal Physical Review Letters, is the first to use realistic globular cluster models to make detailed predictions of LISA sources.

Also Read: NASA Is Sending a Helicopter to Mars in 2020 

The team used more than a hundred fully evolved globular cluster models with properties similar to those of the observed globular clusters in the Milky Way.

The models were run on Quest, Northwestern’s supercomputer cluster. This powerful resource can evolve the full 12 billion years of a globular cluster’s life in a matter of days. (IANS)

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China Successfully Broadcasts Photos From The Far Side Of The Moon

The far side has been observed many times from lunar orbits, but never explored on the surface.

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Moon, China
The far side of the moon, photographed by the Chang'e-4 lunar probe, is seen in this image provided by China National Space Administration, Jan. 3, 2019. VOA

China on Friday broadcast pictures taken by its rover and lander on the moon’s far side, in what its space program hailed as another triumph for the groundbreaking mission to the less-understood sector of the lunar surface.

The pictures on state broadcaster CCTV showed the Jade Rabbit 2 rover and the Chang’e 4 spacecraft that transported it on the first-ever soft landing on the far side of the moon, which always faces away from Earth.

The pictures were transmitted by a relay satellite to a control center in Beijing, although it wasn’t immediately clear when they were taken.

“The lander, its rover, and the relay satellite are all in a stable condition. They have reached the predetermined engineering goals, right now they are getting into the stage of scientific searches,” Zhang Kejian, director of the China National Space Administration, said before engineers at the Beijing center.

China, Moon
A worker inspects a scale model of the moon rover for China’s Chang’e 4 lunar probe, at a factory in Dongguan, Guangdong province, China. VOA

“Now I declare that the Chang’e 4 mission, as a part of the Chang’e Lunar Exploration Program, has been a success,” Zhang said.

Pictures transmitted back show a rocky surface with the jagged edge of craters in the background, posing a challenge for controllers in plotting the rover’s future travels, the official Xinhua News Agency said.

Among the images is a 360-degree panorama stitched together from 80 photos taken by a camera on the lander after it released the rover onto the lunar surface, Xinhua said, citing Li Chunlai, deputy director of the National Astronomical Observatories of China and commander-in-chief of the ground application system of Chang’e 4.

“From the panorama, we can see the probe is surrounded by lots of small craters, which was really thrilling,” Li was quoted as saying.

cHINA, MOON, shopify
A moon is seen behind the construction site of China Zun in Beijing’s central business area. VOA

The space administration also released a 12-minute video of Chang’e 4’s landing utilizing more than 4,700 images taken by an on-board camera. The probe is shown adjusting its altitude, speed and pitch as it seeks to avoid obstacles on the ground.

Researchers hope that low-frequency observations of the cosmos from the far side of the moon, where radio signals from Earth are blocked, will help scientists learn more about the early days of the solar system and birth of the universe’s first stars.

Also Read: NASA Seeks US Partners to Develop Reusable Systems For Moon Mission

The far side has been observed many times from lunar orbits, but never explored on the surface. It is popularly called the “dark side” because it can’t be seen from Earth and is relatively unknown, not because it lacks sunlight.

The pioneering landing highlights China’s ambitions to rival the U.S., Russia and Europe in space through manned flights and the planned construction of a permanent space station. (VOA)