The “Roman Space Telescope” may be the best for discovering Kilonova. What is the reason? | sorae portal site to the universe

[▲Darlun dychmygol o sêr niwtron yn uno i achosi ffenomen ffrwydrol o’r enw “Kironova” (Credyd: NASA, ESA, J. Olmsted (STScI))]

A research group led by Eve Chase from Los Alamos National Laboratory, USA,The space telescope “Nancy Grace Roman” (hereafter, “Roman Telescope”) under development is ideal for the discovery of “kilonova”publish a paper.The Roman Telescope was developed by the National Aeronautics and Space Administration (NASA).May 2027A space telescope about to be launched

Kilonova, which is difficult to detect with existing telescopes

A kilonova is an explosive phenomenon that occurs when neutron stars left behind by massive stars that have gone supernova collide with each other.That’s what I mean. Despite having a mass close to that of the Sun, the diameter is10kmWhen these high density neutron stars, said to be only about 6 miles apart, merge together, they form gold, platinum, and strontium.heavy elements are producedwill The heavy elements produced by Kilonova areFormation of the crust of rocky Earth-like planets in the futureIt is believed to be

Kilonova, a theoretical phenomenon, was first observed inAugust 17, 2017That’s what I was talking about. American gravitational wave telescopeLIGOand European gravitational wave telescopes“virgo”but,About 130 million light yearsDistant gravitational waves「GW170817After about 1.7 seconds after detection“Fermi” gamma-ray space telescopeis the phenomenon of high energy electromagnetic wave emission“gamma ray burst”detect Furthermore, as a result of subsequent observations with NASA’s “Hubble” Space Telescope, etc.Fading glow from scattered debris after an explosioncatch it

Related: Kilonova GW170817 detects lanthanum and cerium, the first lanthanides detected in a neutron star merger

However, more kilonova are believed to occur in more distant universes, and GW170817, which occurred 130 million light years away, which is astronomically close, is not necessarily a representative example of a kilonova, it may not be. Daniel Scolnic from Durham University, UK,“It remains unclear how often kilonova occur and in which galaxies, whether the kilonova we have detected is typical, and how bright the explosions are.”He said.

Chase’s research group includes not only existing telescopes but also telescopes to be built and launched in the future.A total of 13 wide field observation instrumentsWe examined whether kilonova can detect .

The research group hypothesizes a case where neutron stars, or neutron stars and black holes, which are candidates for kilonova, are first detected as gravitational waves by LIGO, Virgo, and the Japanese gravitational wave telescope “KAGRA”. that the tracking observation is performed with a wide field observation device after the detection of the wave. As a result, it was concluded that the Roman telescope would detect a kilonova with high probability.

[▲ Delwedd o ganfod cilonova gan y Telesgop Gofod Rhufeinig (Credyd: Sefydliad Gwyddoniaeth Telesgop Gofod)]

The expansion of the universe is said to be one of the reasons why the Roman Telescope is a powerful tool for kilonova discovery. Light (visible light) emitted from celestial bodies that existed billions of years ago gets longer in wavelength as it travels through the expanding universe, so it is observed as infrared rays on Earth (cosmological decline). The Roman Telescope is a telescope that specializes in near-infrared detection,about 7 billion light yearsIt will reportedly be able to detect kilonova emitted from a distance.

Related: New ‘three-dimensional space map’ reveals locations of 400,000 galaxies

Also, the Roman Telescope specializes in observationAnother advantage of near-infraredKilonova appears to emit electromagnetic waves of various wavelengths,gamma raysteeth‘Brief gamma rays’ lasting less than 2 secondsis dropped asUV and visible lightteeth1 to 2 daysIt will not be possible to detect it withnear infraredeven after neutron stars merge1 week or moreIt is said to be observable. According to the research group, the Roman telescope will be used after the merger of neutron stars.2 weeks or moreIt is expected to be visible for some time.

Once observations by the Roman Telescope begin, it is expected that we will be able to obtain a great deal of statistical information, such as where and how often cilonova events occur. Scolnic about the Roman Telescope“There will be explosion phenomena physics[fel kilonova]begins to develop statistical studies[fel amlder digwyddiadau cilonova]together with a great deal of new analysis.”I have high hopes.

Source

  • Image Credit: NASA, ESA, J. Olmsted (STScI)
  • NASA – How NASA’s Roman Telescope Will Scan for Explosion Prevention
  • LIGO – DESCRIPTIVE WAVES AND GAMMA RAYS FROM A BINARY NEUTRON STAR MERGER: GW170817 AND GRB 170817A
  • doi: 10.48550/arXiv.2105.12268 – Kilonova Detectable with Wide Field Instruments
  • doi: 10.48550/arXiv.1710.05845 – How Many Kilonovae Can Be Detected in Past, Present and Future Survey Datasets?
  • doi: 10.1038/nature12505 – ‘kilonova’ associated with short-lived γ-ray burst GRB 130603B

Text / Misato Kadono

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