Gong Biping Urumqi Observatory The same physics underlying SGRs, AXPs, X-ray pulsars and radio pulsars Gong Biping Urumqi Observatory 2019/4/11

A possible model on timing noise 2019/4/11

Observational phenomena of isolated pulsars timing noise Braking index Ratios of pulse frequency derivatives 2019/4/11

braking index Timing noise 2019/4/11

ratios By magnetic dipole radiation ? No 2019/4/11

Are they induced by unknown companion? 2019/4/11

Effect of Orbital motion 2019/4/11

Observer’s time 2019/4/11

Averaging by observer’s time (1) 2019/4/11

Averaging by observer’s time (2) 2019/4/11

Effect on pulse frequency derivative(s) where 2019/4/11

Ratios can be interpreted 2019/4/11

Age 2019/4/11

Braking index and timing noise parameters on different pulsars can be interpreted by the same model x=(M2/M)a sin i/c 2019/4/11

2019/4/11

Summary For SGRs,AXPs, X-ray pulsars and radio pulars Timing noise Braking index ratios For the timing noise of G.Hobbs |n|>>3 46% of n are negative the curve of timing Res The value of timing noise parameter 2019/4/11

Thank you 2019/4/11

The masses and orbital period of 1E1207 are constrained in the area ABCD 2019/4/11

Interpretation of four puzzles of 1E1207 2019/4/11

2019/4/11

2019/4/11