Download presentation
Presentation is loading. Please wait.
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
25
N_GLAST_pulsed ~ 140 N_GLAST_detected ~ 750 L ~ P^-1.8 * B^1.5 McLaughlin & Cordes 2000
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.