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Saturday, August 1, 2020 | History

3 edition of Why "galactic" gamma-ray bursts might depend on environment found in the catalog.

Why "galactic" gamma-ray bursts might depend on environment

Why "galactic" gamma-ray bursts might depend on environment

blast waves around neutron stars

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Astronomical models,
  • Gamma ray bursts,
  • Gamma rays,
  • Interstellar matter,
  • Isotropy,
  • Magnetic flux,
  • Neutron stars

  • Edition Notes

    Other titlesWhy "galactic" gamma ray bursts might depend on environment.
    StatementMartin J. Rees, Peter Mészáros, Mitchell C. Begelman.
    SeriesNASA contractor report -- NASA CR-199556.
    ContributionsMészáros, Peter., Begelman, Mitchell C., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15419438M

      Use the URL: for 10% with a new website and support this channel. Also make your life easier. Thanks a lot to Squarespace. Start studying astronomy test 2: gamma ray bursts. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

    A history of the gamma-ray burst flux at the Earth from Galactic globular clusters 3 The probability distribution over globular cluster distances and the expected GRB flux at the Earth For a given globular cluster, c, we convert the set of (thousands of) relative orbits into a . Brief bursts of high-energy radiation may sterilize most planets across the universe, hampering the chances for widespread intelligent life.

    Much of the neutron star magnetic energy must be converted to burst energy in energetic particles and gamma-rays gamma ray energy can be more than 10^39 Joules Some bursts have been close enough to affect the ionization in the Earth's ionosphere; in one case, the ionization at night was comparable to that created by the Sun during the day.   A gamma-ray burst is a high-energy explosion that occurs in space. Commonly abbreviated as GRB, these are the most powerful blasts in the cosmos, and the dazzling flash of gamma rays fills up our sky at least once every day.


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Why "galactic" gamma-ray bursts might depend on environment Download PDF EPUB FB2

Galactic Gamma-Ray Bursts theoretical problems as cosmological models]. The bursts could then be due to violent disturbances in the magnetospheres of neutron stars.1'2 Any disturbance of the kind proposed is also likely to expel magnetic flux and plasma into the interstellar medium (ISM) surrounding the neutron star, possibly at relativistic speed.

Get this from a library. Why 'galactic' gamma-ray bursts might depend on environment: blast waves around neutron stars. [Martin J Rees; Peter Mészáros; Mitchell C Begelman; United States.

National Aeronautics and Space Administration.]. Why `Galactic' Gamma-Ray Bursts Might Depend on Environment: Blast Waves Around Neutron Stars. I.A. Smith: Galactic Arm and Disk Plus Halo Models of Gamma-Ray Burst Sources.

J.C.L. Wang and R.W. Nelson: A Possible Cyclotron Line Signature from Quiescent Gamma-Ray Burst Counterparts. R.S. White: BATSE Requirements for a Colliding Comet Source of Gamma-Ray Bursts. Soft Gamma. Although galactic models for gamma-ray bursts are hard to reconcile with the isotropy data, the issue is still sufficiently open that both options should be explored.

The most likely 'triggers' for bursts in our Galaxy would be violent disturbances in the magnetospheres of neutron stars. Any event of this kind is likely to expel magnetic flux and plasma at relativistic speed. WHY GALACTIC GAMMA-RAY BURSTS MIGHT DEPEND ON ENVIRONMENT - BLAST WAVES AROUND NEUTRON-STARS.

AIP Conference Proceedings. ; Thermal and nonthermal processes in active galactic nuclei. ; ANGULAR-MOMENTUM TRANSFER IN THE INNER PARSEC. (b) This map of gamma-ray burst positions measured by the Compton Gamma-Ray Observatory shows the isotropic (same in all directions), uniform distribution of bursts on the sky.

The map is oriented so that the disk of the Milky Way would stretch across the center line (or equator) of the oval.

Cosmic events like gamma ray bursts or nearby supernovae could reset the astrobiological clock to give a planet and star a second chance to sync up and try again to produce life.

Gamma ray bursts are mysterious explosions that release huge amounts of energy, occurring either as the dying explosions of super-massive stars (like Eta Carinae) or collisions of. Gamma-ray bursts produce photons with energies from about keV to 1 MeV over a relatively short time scale, 1– s.

Based on observations of the afterglows associated with long GRBs, one concludes that they have cosmological origin and the energy of each burst should be of order 10 52 – 10 53 ergs, assuming isotropy. If the gamma-ray burst happened at this distance, the radiation would have been absorbed by our atmosphere, only leaving a trace in the isotopes that eventually found.

Summary, most likely no effect. At most, could have an effect on our ozone layer. The danger is from UV light. Our atmosphere shields us from the ionizing radiation, same mass as ten meters thickness of water.

Even if the burst originates as close. Astronomers believe that gamma ray bursts might explain some of the mass extinctions that happened on Earth. The most devastating was probably one that occurred million years ago causing the. arXivv1 [] 10 Dec RH Dissertation for the degree of doctor of philosophy Exploring Gamma-Ray Bursts, Their Immediate Environment and Host.

A nearby gamma-ray burst, beamed directly at Earth, is pretty unlikely. However, if one did occur, the amount of damage would depend on how close the burst is. Assuming one occurs in the Milky Way galaxy, but very far away from our solar system, things might not be too bad.

If it happens relatively nearby, then it depends on how much of the. Gamma-ray bursts (GRBs) are the most extreme explosive events in the universe.

The initial (prompt) phase lasts typically less than s and has an energy content of ~10 51 ergs, giving a luminosity that is a million times larger than the peak electromagnetic luminosity of the bright emission from an exploding-star supernova.

The GRB name is a good one because their spectra peak in the gamma. On Aug. 17, the Gamma-ray Burst Monitor on NASA's Fermi Gamma-ray Space Telescope saw a short burst of gamma rays a smashup of neutron stars, marking the first-ever detection of light from a.

But most of all, gamma-ray bursts (GRBs) points to the enormous scale presence of antimatter in the universe. The GRBs are extremely energetic explosions that. Using Equations (11), (12) and (Several of us have studied the potential effects of a galactic gamma ray burst on planetary atmospheres and biospheres [9][10] [11] [12][13].

The main effects we. An anomalous gamma-ray excess emission has been found in the Fermi Large Area Telescope data1 covering the centre of the Galaxy2,3. Several theories have been proposed for this ‘Galactic centre.

Short gamma-ray bursts are a hot topic at today's sessions: agenda. "We have had good evidence since the s that the short bursts and long bursts were different classes," Gehrels explains.

"It had to do with their gamma ray properties." Not only do the short bursts last less than about 2 seconds, the spectrum of light they emit is distinct. A key moment in researching gamma-ray bursts occurred suddenly Mawhen a brilliant burst in the constellation Leo appeared in the data collectors of NASA’s High Energy and Transient.

Based on our understanding of what might be possible causes for GRB, there's nothing to suggest that this phenomena is isolated to other galaxies alone, but we have so far only detected GRB originating from outside of the Milky Way.What makes the December 27th gamma ray burst unique is that it is the first time that a burst this bright has been observed, one that also happens to originate from within our own Galaxy.

Astronomers have theorized that gamma ray bursts might travel in association with gravity wave bursts.Gamma-Ray Bursts Thought to be from Edge of Universe. Janu The latest measurement and analysis of the sky positions of over 1, gamma-ray bursts (sky map) provide strong indications that these bursts originate from the remotest parts of the .