Pulsars Presented by Rico Bürgler & Shuting Ling.

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Presentation transcript:

Pulsars Presented by Rico Bürgler & Shuting Ling

What is a pulsar? Stands for pulsating radio star Is a type of neutron star Heavily magnetized Very high rotation speed Continuous radiation, emits beams across the spectrum How presentation will benefit audience: Adult learners are more interested in a subject if they know how or why it is important to them. Presenter’s level of expertise in the subject: Briefly state your credentials in this area, or explain why participants should listen to you. 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Discovery First observation in 1967 by Jocelyn Bell Burnell and Anthony Hewish in the UK Pulses in 1.33s intervals LGM-1 à CP1919 à PSR B1919+21 Theories on how the radiation is emitted exist “We did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission. It is an interesting problem - if one thinks one may have detected life elsewhere in the universe how does one announce the results responsibly? Who does one tell first?” Lesson descriptions should be brief. 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Illustration Cones = beam, located on the magnetic axis Golden lines: magnetic field lines Purple line: rotational axis 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

The beam’s origin (rotation-powered pulsars) Electric field is created Accelerates protons and electrons on surface Intense electromagnetic beam results Loss of energy à slowing down «death-line» after ~10-100M yrs 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Other categories Accretion-powered pulsars Magnetars Millisecond pulsars 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Accretion-powered Binary star system Accounts for most X-ray pulsars Energy source: Gas/Matter from stellar companion. Stellar wind Gravitational pull due to distance Short visible pulsars 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Millisecond Pulsar Rotational period of 1-10ms How are they born? Recycled/Accretion powered with additional angular momentum Breaking the chandrasekhar limit Great clocks Great for observing nearby matter 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Magnetars Pulsar with high magnetic field Rotation period of 1-12s Non-periodic flares also generating weaker after flares Soft Gamma Repeater(SGR) SGR 1745-29, found close to Sagittarius A* in Mily Way B-Field 1'000x of neutron stars 10^8T Flares: Radiation of energy of about 10k years worth the suns 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Crab pulsar Relatively young neutron star Center of Crab nebula Pulses in 33ms intervals, roughly 30 times per second Remnant of SN 1054, observed in 1054 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

Applications Probes of the Interstellar Medium Gravitational Waves Detectors Clocks 29.04.16 Pulsars, Rico Bürgler & Shuting Ling

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