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The Transient Universe: AY 250 Spring 2007 Neutron Stars II: Pulsar-Black Hole Binaries & Gamma-Ray Pulsars Geoff Bower.

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Presentation on theme: "The Transient Universe: AY 250 Spring 2007 Neutron Stars II: Pulsar-Black Hole Binaries & Gamma-Ray Pulsars Geoff Bower."— Presentation transcript:

1 The Transient Universe: AY 250 Spring 2007 Neutron Stars II: Pulsar-Black Hole Binaries & Gamma-Ray Pulsars Geoff Bower

2 The Transient Universe: AY 250 Spring 2007 Binary Parameter Space GM/R GM/a M

3 The Transient Universe: AY 250 Spring 2007 Pulsar Binaries Wex & Kopeikin 1997

4 The Transient Universe: AY 250 Spring 2007 Timing Results Mtot M_BHGW Frame-dragging BH Spin Wex & Kopeikin 1999

5 The Transient Universe: AY 250 Spring 2007 Determination of Masses Kramer et al 2005

6 The Transient Universe: AY 250 Spring 2007 Spin/Quadrupole Kerr BH NS: C ~ 2 - 12 Boson star

7 The Transient Universe: AY 250 Spring 2007 Detecting Quadrupole Moment 30 M_sun 10^4 M_sun Effect ~ M^3

8 The Transient Universe: AY 250 Spring 2007

9 Imaging the Galactic Center 7mm VLBA (Bower & Backer 1998) What We See What We Want to See

10 The Transient Universe: AY 250 Spring 2007 7 mm 700 x 400 micro arcsec

11 The Transient Universe: AY 250 Spring 2007 Scattering Inhibits Imaging Lo et al. 1998

12 The Transient Universe: AY 250 Spring 2007 Scattering Inhibits Imaging Electron Density Fluctuations 100 pc 8000 pc

13 The Transient Universe: AY 250 Spring 2007 Pulse Broadening Cordes & Lazio 1997

14 The Transient Universe: AY 250 Spring 2007 5 sec 5 msec

15 The Transient Universe: AY 250 Spring 2007 SKA is Necessary for GC Pulsars Cordes et al 2004

16 The Transient Universe: AY 250 Spring 2007 Gamma-ray Pulsars CrabGeminga Thompson et al 1977

17 The Transient Universe: AY 250 Spring 2007 Improved Geminga Period Chandler et al 2001

18 The Transient Universe: AY 250 Spring 2007 Hartman et al 1999 271 sources 66 blazars 5 pulsars 170 unidentified

19 The Transient Universe: AY 250 Spring 2007 Padovani 2007

20 The Transient Universe: AY 250 Spring 2007 EGRET Pulsar Population Chandler et al 2001 G-ray pulsars Geminga Crab

21 The Transient Universe: AY 250 Spring 2007 G-ray Pulsar Population 5 objects 4/5 are radio pulsars –Geminga is exception Many unidentified galactic plane sources that are likely to be pulsars but are not radio pulsars  Broader G-ray pulse?  Magnetar pulsars?

22 The Transient Universe: AY 250 Spring 2007 GLAST Pulsar Detection

23 The Transient Universe: AY 250 Spring 2007

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25 N_GLAST_pulsed ~ 140 N_GLAST_detected ~ 750 L ~ P^-1.8 * B^1.5 McLaughlin & Cordes 2000


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