Supernovae

Supernovae

  • Nicolas Chamel added an answer:
    Can any one send the pdf file for the relativistic equation of state for the Supernova and Neutron Star with the help of RMF theory.

    Based on Relativistic Mean Field theory.

    Nicolas Chamel · Université Libre de Bruxelles

    Regarding neutron stars, we have recently developed a series of unified equations of state. Tables can be downloaded at http://vizier.cfa.harvard.edu/viz-bin/VizieR?-source=J/A+A/559/A128

  • Jogy George added an answer:
    If an earthquake of Richter scale 7 is recorded due to supernova explosion in a distant galaxy, what is the corresponding h+ value?

    In gravitational wave detection, they tries to identify h+ ~ 10^-23. Gravitational waves due to Super Nova explosions reach the surface of the earth after traveling through the outer space for 1000s of years.  They can cause sudden expansion & contraction of Earth, leading to earthquake. How much would be the expected h+ value, ie dL/L where dL is the change in distance over a distance L;  for 7 magnitude Earth quake due to Super Nova explosion?

    For more info: http://viewzone2.com/gravitywavesx.html

    Jogy George · Raja Ramanna Centre for Advanced Technology

    Ans: h+ ~ 7.85x 10^-7

     In Richter scale (local magnitude version), a " 0" magnitude of earthquake corresponds to 1 um (micrometer) of Amplitude (A0) of vibration of the measuring instrument. This along with the radius of the Earth (R) of 6370 km translates to h+ value of  A0/2R ~7.85x 10^-14

      Also, in Richter scale, an Earth Quake of magnitude (R) is related to the amplitude of measured vibration (A0 as:  R = Log[A] -Log[A0].  Thus, when R=7.0, we have:

    A/A0 =10^7 or A = A0 x 10^7.  Thus the corresponding h+ value will be 10^7 times higher.  Thus for R=7.0, the h+ value is 7.85 x10^-7.

      In Gravitational Wave Detection, one typically uses a 4 km instrument to detect  h+ value of ~10^-23.  The Gigantic Earth with 6370 km radius transform itself into a 3100 times better sensitivity instrument, and converts the 7.0 magnitude Earth Quake  in to h+  of 7.85 x 10^-7

  • James Garry added an answer:
    Has the important astronomical event, supernova 1054 in constellation Taurus, played any role in the discovery of pulsars?
    I know that the development of radio astronomy was the most crucial step in the discovery, but still I am convinced that the supernova 1054 may have had some inspiring role in the discovery of pulsars.
    James Garry · Red Core Consulting ltd.
    Yacoub,

    The '68 discovery was the first observation of a periodically radiating stellar object. Neutron stars, or rather, supernovae remnants, had been known to be sources of radio emission for a little while before that, but the cognitive link hadn't been made (as far as I understand the chronology) to predict that such signals would be generated.

    The wikipedia page is quite forthcoming, and if you want to go to source, you could always ask Dr Bell-Burnell.
  • Yacoub Anini asked a question:
    How important was the famous astronomical event, the supernova 1054, in the discovery of pulsars?
    I know that many scientists believe that the discovery of pulsars was independent of the astronomical event supernova 1054 in constellation taurus. But subsequently Astronomers find the pulsar at the center of the crab nebula. The pulsar is a rotating neutron star having a strong magnetic field at its surface and emitting radio pulses.

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