Spin Measurements of Black Holes Thomas Dauser

Constraining the Spin from Observations
How good can we distinguish high spin from low spin?
extended Jet compact Jet
high Spin low Spin
2 4 6
2 4 6
Energy [keV] Energy [keV]
1
0.8
0.6
0.4
0.2
0
1
0.8
0.6
0.4
0.2
0
(a)
(b)
a = 0.99
a = 0
a = 0.99
a = 0
4
6
Energy [keV]
A detected broad line yields the spin and indicates a compact
emission region compact emission region. (Dauser et al., 2013)
Flux [a.u.]
Flux [a.u.]
1.15
1.1
1.05
1
0.95
1.15
1.1
1.05
1
0.95
Ratio
Ratio