braking indexes of isolated pulsars n.
Download
Skip this Video
Download Presentation
Braking Indexes of isolated pulsars

Loading in 2 Seconds...

play fullscreen
1 / 34

Braking Indexes of isolated pulsars - PowerPoint PPT Presentation


  • 67 Views
  • Uploaded on

Braking Indexes of isolated pulsars. Arxiv: 1209.2478, 1209.2273, 1211.4689 reporter:Fu, Lei. O utline. 1. Background 2. Models 3. Recent works 4. Our work. Theories Background. Braking law. magnetic dipole model.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Braking Indexes of isolated pulsars' - yen


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
braking indexes of isolated pulsars
Braking Indexes of isolated pulsars

Arxiv: 1209.2478, 1209.2273, 1211.4689

reporter:Fu, Lei

o utline
Outline
  • 1.Background
  • 2.Models
  • 3.Recent works
  • 4.Our work
theories background
Theories Background

Braking law

  • magnetic dipole model

Assume:1.pure magnetic dipole model2.constant magnetic field

observations background
Observations Background
  • Lyne et al.(1993)
  • Crab B0531+21: n=2.51
  • Kaspi et al.(1994)
  • B1509-58 : n=2.91
  • Lyne et al.(1996)
  • Vela B0833-45 : n=1.4
models
models

Magnetic field evolution

magnetic diople radiation: B≠constant

Braking law

models1
models

Disk assisted spin down

  • oblique rotator, non-dipole field, pulsar wind, quadrapole gravitational radiation, varying of effective moment of inertia……
observations
Observations

recent works

arxiv 1209 2478
arxiv:1209.2478

recent works

  • S.-N. Zhang & Y. Xie 2012 ApJ, 757,153
  • magnetic evolution
slide9

arxiv:1209.2478

recent works

for young pulsars for old pulsars

observations1
Observations

recent works

baby pulsars

for baby pulsar younger than 2000 yr
for baby pulsar younger than 2000 yr

recent works

  • for Crab pulsar: age=957 yr(AD1054)
  • this model only applicable for young and old pulsars
observations2
Observations

recent works

arxiv 1209 2273
arxiv:1209.2273

recent works

  • J.A. Pons, D. Viganò & U. Geppert 2012 A&A 547,9
  • Magnetic field evolution senarios

fallback burying

reemergence

SN

thermoelectric field generation

Hall drift

Ohmic decay

slide16

recent works

  • Thermoelectric field generation
    • only efficient for
    • <1000 yr (in standard cooling senario)
  • Field reemergence
    • accreted mass
  • Ohmic decay
    • timescale
    • σ depends on
    • dominant in and lead n> 3
    • after neutrino->photon cooling(105 yr) is slow
slide17

recent works

  • Hall drift oscillatory modes
    • timescale
    • significant for large B field
    • dipole field->smaller scale
    • toroidal field->dipole field
arxiv 1211 4689 ali kan u ertan m a alpar et al 2012

recent works

arXiv:1211.4689Ş. Çalişkan, U. Ertan, M. A. Alpar et al.(2012)
  • PSR J1734-3333
    • only pulsation at radio band