Absorption features and magnetic fields:
Summary
ÿ RX J1605:
The cyclotron line
needs to be weaker at the pulse max to explain the observed
correlation between hardness ratio/pulse max
Vacuum polarization effects?
€ Eline »0.3 keV Þ B » 5(1+z) x 1013 G
€ hardness ratio shifted in phase wrt pulse max
ÿ RX J0720:
" no P, Eline »0.45 keV Þ B » 7(1+z) x 1013 G
ÿ RBS 1223:
" no line yet, dP/dt = 1.4± 0.6 x 10-13 s/s Þ B » (2.8-4.2)x1013 G
" hardness ratio shifted in phase wrt pulse max
ÿ RX J0420:
" no dP/dt, no line yet
" hardness ratio shifted in phase wrt pulse max