Is pulsar b0628 28 really an exception
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IS PULSAR B0628-28 REALLY AN EXCEPTION?. Cuilan Qiao Mentor:Pro. Xiangdong Li Dec.7, 2005. OUTLINE. 1 Introduction 2 Data analysis for spin-powered pulsars 3 Theoretic discussion 4 Conclusion. 1 Introduction. Observation of pulsar B6028-28 Chandra:

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Is pulsar b0628 28 really an exception

IS PULSAR B0628-28 REALLY AN EXCEPTION?

Cuilan Qiao

Mentor:Pro. Xiangdong Li

Dec.7, 2005


Outline

OUTLINE

  • 1 Introduction

  • 2 Data analysis for spin-powered pulsars

  • 3 Theoretic discussion

  • 4 Conclusion


1 introduction

1 Introduction

  • Observation of pulsar B6028-28

    Chandra:

    ► Was observed twice:first on Nov.4,2001 and again on 2002 Mar.25 for 2000 and 17000s respectively;1.141s exposures.

    ► position is

    XMM-Newton:

    ► Was observed on 2004 Feb. 28 for a total on time of 48ks;47ks exposures.

    ► position is


Is pulsar b0628 28 really an exception

  • Properties of pulsar B6028-28

    ► The longest period radio pulsar detected in X-rays (P=1244ms).

    ► The Chandra data yielded a luminosity 2 orders of magnitude greater than what is expected for a spin-powered pulsar(logLx=30.34).

    From Tepedelenlioglu et. al ,APJ astro-ph/0505461


Is pulsar b0628 28 really an exception

Old pulsars

  • Other 41 spin-powered pulsars(Possentiet al.2002)

MSPs

Giminga-like


Is pulsar b0628 28 really an exception

Vela-like

Crab-like


2 data analysis for spin powered pulsars

2 Data analysis for spin-powered pulsars

  • Clustering analysis-with Nearest Neighbor method in matlab

    ► Zscore-----data standardization

    ► Pdist-----calculate space between two objects by Euclidean distance

    ► Squareform-----Euclidean distance matrix

    ► Linkage-----nearest neighbor method

    ► cluster-----cluster data

    ► find----- find elements of every group

    ► Dendrogram-----draw clustering graph


42 spin powered pulsars clustering diagrams

42 spin-powered pulsars clustering diagrams

  • clustering result with logτ and logLx


2 clustering result with logdp dt log and loglx

2 clustering result with logdP/dt、logτ and logLx


Clustering result with logp logdp dt log and loglx

clustering result with logP、logdP/dt、logτand logLx


Clustering result with logp logdp dt log loglsd and loglx

clustering result with logP、logdP/dt、logτ、logLsd and logLx


Clustering result with logp and loglx

clustering result with logP and logLx


Clustering result with loglsd and loglx

clustering result with logLsd and logLx


Fitting

Fitting

  • 42 spin-powered pulsars fitting graphes with errorbars

logLx~logτ

B0628-28


Is pulsar b0628 28 really an exception

B0628-28

logLx~logLsd


42 spin powered pulsars fitting parameter

42 spin-powered pulsars fitting parameter


3 theoretic discussion

3 Theoretic discussion

  • Model ---a one-zone shocked wind model (Chevalier,2000)

  • The central pulsar generates a highly relativistic,particle-dominated wind that passes through the medium in the supernova remant,forming a shock front. The electrons and positrons in the wind acruire a power-law energy spectrum in the shock front and radiate synchrotron emission in the sownstream region.

    The basic simplification is that the emitting region can he treated as one zone

    One-zone model that does not attemp to account for the spatial structrue of the nebulae.


3 theoretic discussion1

3 Theoretic discussion


4 conclusion

4 Conclusion

  • 42 spin-powered pulsars can be grouped into 2 groups;

  • Lx~τ-2,Lx~Lsd;

  • Pulsar B5028-28 is under the groups of spin-powered pulsars.


Is pulsar b0628 28 really an exception

Thanks!


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