射电脉冲星距离测量：1、Independentdistanceestimatesorconstraints1.1、Interferometric or timing parallaxes1.2、H1 absorption1.3、Associations withglobularclustersorsupernovaremnants(DM)2.PulsardistancefromdispersionmeasureDDM=n.dlJODMDMnL<n.>
1、Independent distance estimates or constraints 1.1、Interferometric or timing parallaxes 1.2、H I absorption 1.3、Associations with globular clusters or supernova remnants 射电脉冲星距离测量： 2. Pulsar distance from dispersion measure (DM) 0 D DM n dl e e DM L n = e DM n L =
1.1、脉冲星三角视差·涉仪成像～4·Timing视差 ～20
1.1、脉冲星三角视差 • 干涉仪成像 ～4 • Timing视差 ～20
三角视差法背景星场射电干涉仪成像测量距离<1kpc自行06 38 22:921 Apr 2000C12 Dec 1999视差Mar19mCCObsrrvation Date23 Sep 199522.5Parallax and proper motion of B0919+06using an in-bcam calibrator 12’ away.09 Nov 199422.4Parallax =0.83 (0.13) masProper motion = 88.48 (0.13) mas/yr(Chatterjee et al., ApJ in press, 2001)09 22 14.006.14.0041413.95RIOHTASCENSONJSOCO
背景星场 D α 三角视差法 测量距离<1kpc 射电干涉仪成像 自行 视差
三角视差法PSRB0950+08Motion of B0950+08μ=-2.09±0.08射电手段：Mg=29.46±0.072000.893元=3.82±0.07202000.395PSRB 1929+10MotionofB1929+102000.137HSTPixel01999.8582000.61g[spw]2000.367[sow]01999.373-2022000,1662000:8432000.9401998.874320-2-3-1-40Aa.[mos]1998.3311998.337-60200-20Aα [mas]
PSRB 1929+10 射电手段： 三角视差法 PSR B0950+08
Timing parallax(r.s)?-lr)of2cd2cddSSBs△t, = 12 cos βTiming精度要求高：2cd消色散技术毫秒脉冲星If d = 1kpcAt, ≤1.2us靠近黄道面距离要近
Timing parallax 1 1 2 2 2 ( ) (( ) | | ) 2 2 t r s r s r cd cd = − = • − 2 cos 2 t l cd = If d = 1kpc t s 1.2 Timing 精度要求高： 消色散技术 毫秒脉冲星 靠近黄道面 距离要近 d s r SSB β