Pulsars in globular clusters

The tables below list all globular clusters with known pulsars and all the pulsars in them (see ASCII version of the latter). We give relevant references on each pulsar whenever they are available, please cite these if possible. At the bottom, we also list the history of changes to this page. We hope you find these tables useful! If you do, please footnote the URL in your paper. Thanks!

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Globular cluster table

Total number of pulsars: 149, in 28 globular clusters, with two (M3C and NGC 6749B) likely real but needing confirmation.
Check Alessandro Ridolfi's plot of pulsars per globular cluster (pdf/png).
Cluster Name Core radius
(arcmin)
Half-light radius
(arcmin)
Tidal radius
(arcmin)
Galactic longitude, l
(deg)
Galactic latitude, b
(deg)
Distance
(kpc)
Number of pulsars Number of binary pulsars
47 Tuc (NGC 104) 0.44 2.79 47.25 305.90 −44.89 4.5 25 15

NGC 1851 0.06 0.52 11.70 244.51 −35.04 12.1 1 1

M53 (NGC 5024) 0.36 1.11 21.75 332.96 79.76 17.8 1 1

M3 (NGC 5272) 0.55 1.12 38.19 42.41 78.71 10.4 > 3 > 2

M5 (NGC 5904) 0.42 2.11 12.07 3.86 46.80 7.5 5 4

NGC 5986 0.63 1.05 10.52 337.02 13.27 10.4 1 1

M4 (NGC 6121) 0.83 3.65 32.49 350.97 15.97 2.2 1 1

M13 (NGC 6205) 0.78 1.49 25.19 59.01 40.91 7.7 5 3

M62 (NGC 6266) 0.18 1.23 8.97 353.57 7.32 6.9 6 6

NGC 6342 0.05 0.88 14.86 4.90 9.73 8.6 1 1

NGC 6397 0.05 2.33 15.81 338.17 −11.96 2.3 1 1

Terzan 5 0.18 0.83 9.84 3.84 1.69 10.3 37 18

NGC 6440 0.13 0.58 6.31 7.73 3.80 8.4 6 3

NGC 6441 0.11 0.64 8.00 353.53 −5.01 11.7 4 2

NGC 6517 0.06 0.62 4.10 19.23 6.76 10.8 4 1

NGC 6522 0.05 1.04 16.44 1.02 −3.93 7.8 3 0

NGC 6539 0.54 1.67 21.46 20.80 6.78 8.4 1 1

NGC 6544 0.05 1.77 2.05 5.84 −2.20 2.7 2 2

NGC 6624 0.06 0.82 20.55 2.79 −7.91 7.9 6 1

M28 (NGC 6626) 0.24 1.56 11.27 7.80 −5.58 5.6 12 8

NGC 6652 0.10 0.48 6.3 1.53 −11.38 10.0 1 1

M22 (NGC 6656) 0.77 1.10 5.21 9.89 −7.55 3.2 2 1

NGC 6749 0.77 1.10 5.21 36.20 −2.20 7.9 > 1 > 1

NGC 6752 0.17 2.34 55.34 336.49 −25.63 4.0 5 1

NGC 6760 0.33 2.18 12.96 36.11 −3.92 7.4 2 1

M71 (NGC 6838) 0.63 1.65 8.96 56.74 −4.56 4.0 1 1

M15 (NGC 7078) 0.07 1.06 21.50 65.01 −27.31 10.3 8 1

M30 (NGC 7099) 0.06 1.15 18.34 27.18 −46.83 8.0 2 2



Pulsar table
Pulsars in
NGC 104
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J0023−7204C 1.21 5.75678 −4.9850(6) 24.599(2) i i i i mlj+90,rlm+95,frk+17
J0024−7204D 0.68 5.35757 −0.3429(7) 24.729(2) i i i i mlr+91,rlm+95,frk+17
J0024−7205E 0.65 3.53633 +9.8510(6) 24.230(2) 2.25684 1.9818423(8) 0.0003152(9) 0.18 mlr+91,rlm+95,fcl+01,frk+17
J0024−7204F 0.19 2.62358 +6.4500(4) 24.379(5) i i i i mlr+91,fcl+01,frk+17,bhc+17
J0024−7204G 0.29 4.04038 −4.215(2) 24.441(5) i i i i mlr+91,fcl+01,frk+17
J0024−7204H 0.77 3.21034 −0.183(1) 24.36(3) 2.35770 2.152813(3) 0.070560(3) 0.19 (i) mildly eccentric mlr+91,fcl+01,fck+03,frk+17
J0024−7204I 0.29 3.48499 −4.587(2) 24.42(2) 0.22979 0.038447(2) < 0.0004 0.015 black widow mlr+91,rlm+95,fcl+01,frk+17
J0023−7203J 1.00 2.10063 −0.97922(9) 24.5848(9) 0.12066 0.0404022(2) < 0.00004 0.024 eclipsing black widow mlr+91,rlm+95,clf+00,fck+03,frk+17
J0024−7204L 0.14 4.34617 −12.206(4) 24.38(5) i i i i mlr+91,fcl+01,frk+17
J0023−7205M 1.05 3.67664 −3.844(3) 24.42(2) i i i i mlr+91,fcl+01,frk+17
J0024−7204N 0.49 3.05395 −2.1870(9) 24.57(2) i i i i rlm+95,fcl+01,frk+17
J0024−7204O 0.06 2.64334 +3.0354(9) 24.363(10) 0.13597 0.045151(2) < 0.00016 0.025 eclipsing black widow clf+00,fcl+01,fck+03,frk+17
J0024−7204P * 3.64302 * 24.3 0.14725 0.038008(4) 0.0 0.02 black widow clf+00,rft+16
J0024−7204Q 0.98 4.03318 +3.402(2) 24.29(2) 1.18908 1.462209(4) 0.000085(5) 0.21 clf+00,fcl+01,rbh+15,cpf+15,frk+17
J0024−7204R 0.15 3.48046 +14.8371(3) 24.4 0.06623 0.03363(1) 0.0 0.030 eclipsing black widow clf+00,frk+17
J0024−7204S 0.19 2.83041 −12.054(2) 24.353(9) 1.20172 0.766270(3) 0.000394(7) 0.10 clf+00,fkl01,fck+03,rbh+15,cpf+15,frk+17,bhc+17
J0024−7204T 0.34 7.58848 +29.37(1) 24.39(6) 1.12618 1.33850(2) 0.00040(2) 0.20 clf+00,fkl01,fcl+01,rbh+15,cpf+15,frk+17
J0024−7203U 0.94 4.34283 +9.523(1) 24.335(4) 0.42911 0.526950(1) 0.000149(4) 0.14 clf+00,fcl+01,egh+01,rbh+15,cpf+15,frk+17
J0024−7204V * 4.81017 * 24.105 0.21213 0.74191(20 0.0 0.35 eclipsing redback clf+00,rft+16
J0024−7204W 0.08 2.35234 −8.6553 24.3 0.1330 0.2435 0.0 0.14 eclipsing redback clf+00,egc+02,bgb05,rft+16
J0024−7201X 3.83 4.77152 +1.83609 24.539(5) 10.92118 11.91706 0.0000005(2) 0.42 distant from centre lcf+03,rft+16
J0024−7204Y 0.37 2.19666 −3.51720(8) 24.468(4) 0.52194 0.6685967(7) 0.000003(3) 0.16 lcf+03,rbh+15,cpf+15,frk+17
J0024−7204Z 0.15 4.55445 −0.456(1) 24.45(4) i i i i frk+17,bhc+17
J0024−7204aa 0.47 1.84538 −4.5890(15) 24.941(7) i i i i phl+16, fr18, bhc+17
J0024−7204ab 0.21 3.70464 0.9844(3) 24.37(2) i i i i phl+16,frk+17,bhc+17
Pulsars in
NGC 1851
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J0514−4002A 0.08 4.99058 +0.117(14) 52.1489(6) 18.78518 36.296588(9) 0.8879773(3) 1.1 (ii) eccentric, massive, exchange product fgri04, frg07
Pulsars in
M53 (NGC 5024)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1310+18 * 33.1632 * 24.0(1.5) 255.8(6) 84.2(7) 0.01 0.35 long orbit kapw91
Pulsars in
M3 (NGC 5272)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1342+2822A * 2.545 * 26.5 * * * * hrs+07
J1342+2822B 0.14 2.389 +1.858 26.148(2) 1.41735 1.875655(2) 0.0 0.21 hrs+07
J1342+2822C * 2.166 * 26.5 * * * * needs confirmation hrs+07
J1342+2822D 0.23(12) 5.443 * 26.34(2) 128.752(5) 38.524(4) 0.0753(5) 0.21 long orbit, mildly eccentric hrs+07
Pulsars in
M5 (NGC 5904)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1516+02A 0.50 5.55359 +4.122(6) 30.08(5) i i i i awkp97, fwbh08
B1516+02B 0.30 7.94694 −0.3306(12) 29.45(3) 6.85845 3.04856 0.137849(12) 0.13 (iii) mildly eccentric awkp97, fwbh08
J1518+0204C 0.125 2.48393 +2.6055(12) 29.3146 0.086829 0.057320 0.0 0.038 eclipsing black widow hrs+07, prf+14
J1518+0204D * 2.988 * 29.3 1.22 1.60 0.0 0.20 hrs+07
J1518+0204E * 3.182 * 29.3 1.10 1.15 0.0 0.15 hrs+07
Pulsars in
NGC 5986
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1546−3747A * 2.60567 * 92.17 1.34671 1.3833 0.0 0.18 lr11
Pulsars in
M4 (NGC 6121)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1620−26 0.767 11.0758 −5.4693(3) 62.8633(5) 191.44281 64.809460(4) 0.02531545(12) 0.33 long orbit, triple system with planet lbb+88,ml88,tat+93,tacl99,srh+03
Pulsars in
M13 (NGC 6205)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1639+36A * 10.3775 < 4.5 30.36(4) i i i i kapw91
B1639+36B * 3.52807 * 29.5(1.5) 1.25911 1.389(2) < 0.001 0.19 and92
J1641+3627C * 3.722 * 30.1 i i i i hrs+07
J1641+3627D * 3.118 * 30.6 0.591 0.924 0.0 0.18 hrs+07
J1641+3627E * 2.487 * 30.3 0.117(8) 0.037(4) 0.0 0.02 black widow, eclipsing? hrs+07
Pulsars in
M62 (NGC 6266)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1701−3006A 0.32 5.24157 −13.196(9) 115.03(4) 3.80595 3.483724(8) 0.000004 0.23 dlm+01,pdm+03, lfrj12
J1701−3006B 0.028 3.59385 −34.978(7) 113.44(4) 0.14455 0.252775(13) <0.00007 0.14 eclipsing redback pdm+03, lfrj12
J1701−3006C 0.175 7.61285 −6.378(22) 114.56(7) 0.21500 0.192880(12) < 0.00006 0.08 P, Pdot twice published pdm+03, lfrj12
J1701−3006D 0.200 3.41777 12.57(24) 114.224(11) 1.11790 0.9880 0.00045(2) 0.14 lfrj12
J1701−3006E 0.111 3.23374 31.03(27) 113.79(2) 0.15848 0.07016 0.0 0.035 eclipsing black widow lfrj12
J1701−3006F 0.041 2.294727 22.21(18) 113.29(3) 0.20549 0.0573 0.0 0.024 black widow lfrj12
Pulsars in
NGC 6342
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1718−19 2.3 1004.04 +1.59(2)*10−15 71.0(2) 0.25827 0.3526(8) < 0.005 0.13 eclipsing, slow, young, distant from centre lbhb93,kkk+00
Pulsars in
NGC 6397
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1740−5340 0.917 3.65033 +16.8(7) 71.8(2) 1.35406 1.65284(7) < 0.0001 0.22 (iv) eclipsing redback, distant from centre dlm+01,dpm+01,fpds01
Pulsars in
Terzan 5
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1748−2446A 0.50 11.5632 −3.40(4) 242.1(2) 0.075646 0.11971(3) 0.0 0.10 eclipsing redback ljm+90,lmbm00,nat00
J1748−2446C 0.17 8.43610 −60.6(4) 237(1) i i i i lmbm00
J1748−2446D * 4.71398 * 243.83 i i i i ran01,rhs+05
J1748−2446E * 2.19780 * 236.84 60.06 23.6 0.02 0.25 long orbit rhs+05
J1748−2446F * 5.54014 * 239.18 i i i i rhs+05
J1748−2446G * 21.6719 * 237.57 i i i i rhs+05
J1748−2446H * 4.92589 * 238.13 i i i i rhs+05
J1748−2446I * 9.57019 * 238.73 1.328 1.818 0.428 0.24 (v) eccentric rhs+05
J1748−2446J * 80.3379 * 234.35 1.102 2.454 0.350 0.39 (vi) eccentric rhs+05
J1748−2446K * 2.96965 * 234.81 i i i i rhs+05
J1748−2446L * 2.24470 * 237.74 i i i i rhs+05
J1748−2446M * 3.56957 * 238.65 0.4431 0.596 0 0.16 rhs+05
J1748−2446N * 8.66690 * 238.47 0.3855 1.619 0.000045 0.56 rhs+05
J1748−2446O * 1.67663 * 236.38 0.2595 0.112 0 0.04 eclipsing black widow rhs+05
J1748−2446P * 1.72862 * 238.79 0.3626 1.272 0 0.44 eclipsing redback rhs+05
J1748−2446Q * 2.812 * 234.50 30.295 28.602 0.722 0.53 eccentric, massive rhs+05
J1748−2446R * 5.02854 * 237.60 i i i i rhs+05
J1748−2446S * 6.11664 * 236.26 i i i i rhs+05
J1748−2446T * 7.08491 * 237.70 i i i i rhs+05
J1748−2446U * 3.28914 * 235.46 3.57026 5.97248 0.60498 0.45 eccentric rhs+05
J1748−2446V * 2.07251 * 239.11 0.5036 0.567 0 0.14 rhs+05
J1748−2446W * 4.20518 * 239.14 4.877 5.869 0.015 0.34 rhs+05
J1748−2446X * 2.99926 * 240.03 4.99850 5.1071 0.3024 0.29 eccentric rhs+05
J1748−2446Y * 2.04816 * 239.11 1.16443 1.1785 0.00002 0.16 rhs+05
J1748−2446Z * 2.46259 * 238.85 3.48807 3.5304 0.7608 0.25 eccentric (g)
J1748−2446aa * 5.78804 * 237.42 i i i i (g)
J1748−2446ab * 5.11971 * 238.34 i i i i (g)
J1748−2446ac * 5.08691 * 238.72 i i i i (g)
J1748−2446ad * 1.39595 * 235.6 1.09443 1.1028 0 0.16 eclipsing redback, fastest pulsar known hrs+06
J1748−2446ae * 3.65859 * 238.75 0.17073 0.0406 0 0.019 low−mass (g)
J1748−2446af * 3.30434 * 237.34 i i i i (g)
J1748−2446ag * 4.44803 * 237.75 i i i i (g)
J1748−2446ah * 4.96515 * 237.75 i i i i (g)
J1748−2446ai * 21.22838 * 233.9 0.85088 2.8088 0.4400 0.57 eccentric, massive (g)
J1748−2446aj 0.17 2.95891 14.1232(6) 238.633(6) i i i i crf+18
J1748−2446ak 0.29 1.89010 8.8495(6) 236.705(5) i i i i crf+18
J1748−2446al * 5.95 * 236.50 i i i i crf+18
Pulsars in
NGC 6440
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1745−20 0.04 288.603 +0.39933(10)*10−15 219.4(2) i i i i slow, young lmd96,frb+08
J1748−2021B 0.07 16.7601 −32.913(16) 220.922(11) 20.55001 4.46699 0.57016 0.090 (vii) eccentric frb+08
J1748−2021C 0.45 6.22693 −5.984(16) 226.95(6) i i i i frb+08
J1748−2021D 0.55 13.4958 +58.678(16) 224.98(3) 0.28607 0.3972 0.00 0.14 eclipsing redback frb+08
J1748−2021E 0.13 16.2640 +31.24(4) 224.10(4) i i i i frb+08
J1748−2021F 0.09 3.79363 −1.055(18) 220.43(8) 9.83397 9.49757 0.0531 0.35 mildly eccentric frb+08
Pulsars in
NGC 6441
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1750−37A 0.21 111.608 +566.1(8) 233.82(3) 17.3343 24.439 0.71243 0.7 (viii) eccentric, massive, slow pdc+05, frb+08
J1750−3703B 0.33 6.07454 +1.92(4) 234.391(9) 3.60511 2.8659 0.00404 0.19 frb+08
J1750−3703C 0.11 26.5687 −99.6(3) 230.67(2) i i i i frb+08
J1750−3703D 0.05 5.13994 +49.28(2) 230.09(17) i i i i frb+08
Pulsars in
NGC 6517
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1801−0857A 0.022 7.17561 −51.310(4) 182.56(1) i i i i lrfs11
J1801−0857B 0.022 28.96159 +219.10(5) 182.39(6) 59.83645 33.87545 0.038 0.38 long orbit lrfs11
J1801−0857C 0.057 3.73870 −6.5(2) 182.26(3) i i i i lrfs11
J1801−0857D 1.202 4.22653 +0.69(6) 174.71(9) i i i i distant from centre lrfs11
Pulsars in
NGC 6522
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1803−30A * 7.101 * 192 i i i i pdc+05
J1803−3002B * 4.397 * 192.6 i i i i (g)
J1803−3002C * 5.840 * 194.5 i i i i (g)
Pulsars in
NGC 6539
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1802−07 0.25 23.1009 +47.0(4) 186.38(1) 2.61676 3.92059(5) 0.21206(2) 0.35 (ix) mildly eccentric dbl+93,tamt93,tc99
Pulsars in
NGC 6544
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1807−2459A 0.07 3.05945 −0.4335(3) 134.0040(6) 0.071091 0.01222 0.0 0.010 black widow dlm+01,rgh+01, lfrj12
J1807−2500B 0.20 4.18618 8.23245(18) 137.1535(20) 9.95667 28.9204 0.74703 1.47 (x) eccentric, massive, exchange product, possible double neutron star lfrj12
Pulsars in
NGC 6624
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1820−30A 0.05 5.44000 +338.5(1) 86.880(6) i i i i young MSP, gamma-ray detection, best evidence for intermediate mass black hole in a globular cluster. bbl+94, kbmo05, kni07, faa+11, psl+17
B1820−30B 0.23 378.596 +0.0315(3)*10−15 87.0(1) i i i i slow, young bbl+94, lfrj12
J1823−3021C 0.134 405.934 +0.2240(25)*10−15 86.88(24) i i i i slow, young lfrj12
J1823−3021D 0.14 3.02006 * 86.8(1.1) i i i i lfrj12
J1823−3021E * 4.394 * 91.4 i i i i lfrj12
J1823−3021F * 4.850 * 86.7 * * * * eclipsing redback lfrj12
Pulsars in
M28 (NGC 6626)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B1821−24A 0.203 3.05431 +155(7) 120 i i i i young MSP, gamma-ray detection lbm+87, fbtg88, cb04, rfk+04, bbs+11, jgk+13
J1824−2452B * 6.547 * 119.5 i i i i (g), bbs+11
J1824−2452C * 4.159 * 120.7 8.078 7.356 0.847 0.30 eccentric (g), bbs+11
J1824−2452D * 79.832 * 119.5 30.404 24.877 0.776 0.45 young, eccentric (g), bbs+11
J1824−2452E * 5.420 * 119.8 i i i i (g), bbs+11
J1824−2452F * 2.451 * 123.8 i i i i (g), bbs+11
J1824−2452G * 5.909 * 119.4 0.1046 0.0165 0.0 0.011 black widow (g), bbs+11
J1824−2452H * 4.629 * 121.5 0.435 0.7195 0.0 0.20 eclipsing redback (g), bbs+11, pdf+10
J1824−2452I * 3.93185 * 119.0 0.45941 0.7658 0.0 0.20 eclipsing redback, switches occasionally to accreting X-ray MSP (g), bbs+11, pfb+13, pdf+13
J1824−2452J * 4.039 * 119.2 0.0974 0.0250 0.0 0.015 black widow (g), bbs+11
J1824−2452K * 4.46105 * 119.8 3.91034 2.6050 0.001524(4) 0.16 (g), bbs+11
J1824−2452L * 4.10011 * 119.0 0.22571 0.0570 0.0 0.022 black widow (g), bbs+11
Pulsars in
NGC 6652
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1835−3259A * 3.889 * 63.35 9.2460 19.6(3) 0.968(5) 0.90 eccentric, massive, echange product drk+15
Pulsars in
M22 (NGC 6656)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1836−2354A 0.68 3.35434 +0.2318(3) 89.107(2) 0.20283 0.0464 0.0 0.020 black widow lrfs11
J1836−2354B 0.21 3.23227 −0.048(6) 93.3(2) i i i i lrfs11
Pulsars in
NGC 6749
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1905+0154A 0.51(38) 3.193 * 193.692(8) 0.81255 0.58862(4) 0.0 0.090 hrs+07
J1905+0154B * 4.968 * 192 * * * * needs confirmation hrs+07
Pulsars in
NGC 6752
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1911−5958A 6.39 3.26619 +0.307(10) 33.68(1) 0.83711 1.206045(2) < 0.00001 0.22(xi) distant from centre dlm+01,dpf+02,bvkh03,fpsd03,bkkv06,cfpd06,cbp+12,fhc+14
J1910−5959B 0.10 8.35780 −79.9(5) 33.28(4) i i i i dpf+02,fhc+14
J1911−6000C 2.70 5.27733 +0.22(7) 33.21(4) i i i i distant from centre dpf+02,fhc+14
J1910−5959D 0.19 9.03529 +96.3(3) 33.32(5) i i i i dpf+02,fhc+14
J1910−5959E 0.13 4.57177 −43.7(1) 33.29(5) i i i i dpf+02,fhc+14
Pulsars in
NGC 6760
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1911+0102A 0.42 3.61852 −0.658 202.678(3) 0.140996 0.037658(2) <0.00013 0.020 black widow dma+93,fhn+05
J1911+0101B 0.12 5.38432 −0.2 196.69(2) i i i i fhn+05
Pulsars in
M71 (NGC 6838)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J1953+1846A 0.33 4.88830 +4.8506 117.3941(15) 0.176795 0.0782246(12) 0.0 0.032 eclipsing black widow hrs+07, cpf+15
Pulsars in
M15 (NGC 7078)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
B2127+11A 0.018 110.665 −2107(3) 67.31(5) i i i i slow wkm+89, and93,jcj+06
B2127+11B 0.079 56.1330 +956(6) 67.69(12) i i i i agk+90,and93,jcj+06
B2127+11C 0.944 30.5293 +499.1(2.5) 67.13(5) 0.33528 2.5183(12) 0.681386(16) 1.13(xii) double neutron star, eccentric, distant from centre, exchange product agk+90,pakw91,and93,jcj+06
B2127+11D 0.019 4.80280 −107.5(1.2) 67.28(21) i i i i and93
B2127+11E 0.135 4.65144 +17.8(7) 66.51(12) i i i i and93
B2127+11F 0.279 4.02704 +3.2(8) 65.52(15) i i i i and93
B2127+11G 0.106 37.6602 +195(45) 66.43(24) i i i i and93
B2127+11H 0.038 6.74339 +2.4(1.3) 67.15(12) i i i i and93
Pulsars in
M30 (NGC 7099)
Offset
(arcmin)
Period (a)
(ms)
dP/dt (a,b)
(10−20)
DM
(cm−3 pc)
Orbital Period
(days)
x
(s)
Eccentricity mc (c)
(M)
Notes References
J2140−2310A 0.067 11.0193 −5.181(20) 25.0640(41) 0.17399 0.2349416(48) < 0.00012 0.11 eclipsing redback rsb+04
J2140−2310B * 13.0 * 25.09(0.12) > 0.8 > 0.1 > 0.52 > 0.02 eccentric rsb+04
Notes in this table:
  • Pulsar names are as indicated in the latest literature. If there is no available position, the name will refer, by default, to the coordinates of the centre of the cluster. The new ATNF pulsar catalogue retains such names even if, after finding a timing solution, the pulsar's position is found to be different.
  • Pulsars 47 Tuc A and B (ajm+89) have never been confirmed. Pulsar 47 Tuc K (mlj+90), was later found to be the third harmonic of 47 Tuc D (rlm+95).
  • Pulsar Ter 5 B (ljm+90) was later renamed PSR J1744−2444 and suspected of not being associated with the cluster (lmbm00). This is confirmed by the DM distribution of the recent discoveries (rhs+05).
  • An asterisk indicates a parameter is still not well determined - this indicates that there is still no published timing/orbital solution.
  • i - Isolated pulsar.
  • (a) The period and period derivative refer to the epochs indicated in the references.
  • (b) Unit is 10−20, except where a power of 10 is indicated.
  • (c) Listed companion masses are calculated assuming a pulsar mass of 1.35 M and an inclination of 60°. For the cases listed below in red there is further information on the masses of the components, that overrules the values listed in the table.
  • (g) Not published elsewhere.
  1. The latest measurement of the rate of advance of periastron of 47 Tuc H (from frk+17) is 0.06725(19) °/year (1-σ). This implies a total system mass of 1.665(7) M. From this, we can derive mp < 1.51 and mc > 0.173 M respectively. The median of the probability for the mass of the pulsar, assuming a flat cos i distribution, is 1.46 M.
  2. The rate of advance of periastron of NGC 1851A has been measured (frg07), it is 0.01289(4) °/year (1-σ). This implies a total system mass of 2.453(14) M. From this, we can derive mp < 1.5 and mc > 0.96 M respectively. Furthermore, the median of the expected pulsar masses (assuming a flat cos i distribution) is 1.35 M.
  3. The rate of advance of periastron of M5B has been measured at 0.0142(7) °/year (one σ, see fwbh08). Assuming the periastron advance is fully relativistic, the total binary mass is 2.29 ± 0.17 M. The maximum pulsar mass is 2.52 M and mc > 0.13 M. mp is 2.08+0.18−0.19 M (median and 1-σ limits). The probability of having a pulsar mass between 1.2 and 1.44 M is 0.77%.
  4. The mass ratio for PSR J1740−5340 has been measured from spectroscopic measurements of the motion of the companion star (fsg+03) to be mp/mc = 5.85(13). Assuming mp between 1.4 and 1.9 M, this constrains the inclination to be between 47° and 56°.
  5. The rate of advance of periastron of Ter 5 I has been measured (rhs+05), it is 0.255(1) °/year (1-σ). This implies a total system mass of 2.17(2) M. From this, we can derive mp < 1.96 and mc > 0.24 M respectively. Furthermore, the median of the expected pulsar masses (assuming a flat cos i distribution) is 1.87 M.
  6. The rate of advance of periastron of Ter 5 J has been measured (rhs+05), it is 0.327(4) °/year (1-σ). This implies a total system mass of 2.20(4) M. From this, we can derive mp < 1.96 and mc < 0.38 M respectively. The median of the expected pulsar masses (assuming a flat cos i distribution) is 1.73 M.
  7. The rate of advance of periastron of NGC 6440B has been measured (frb+08), it is 0.00391(18) °/year (1-σ). This implies a total system mass of 2.92(20) M. From this, we can derive mp < 3.24 and mc > 0.11 M respectively. Furthermore, the median and 1-σ limits of the expected pulsar mass (assuming a flat cos i distribution) is 2.74 ± 0.20 M, there is a 1 % chance that the inclination is low enough to make the mass of the pulsar smaller than 2 M. This is by far the largest pulsar mass ever measured.
  8. The rate of advance of periastron of NGC 6441A has been measured (frb+08), it is 0.0055(3) °/year (1-σ). This implies a total system mass of 1.97(15) M. From this, we can derive mp < 1.65 and mc > 0.53 M respectively. The medians for the pulsar and companion masses are 1.26 and 0.67 M. Another measurement of the rate of periastron has been published by pcm+06; this yields a total system mass of 2.15 ± 0.06 M, consistent with the measurement above.
  9. The rate of advance of periastron of PSR B1802−07 has been measured (tc99), it is 0.0578(16) °/year (1-σ). This implies a total system mass of 1.62(7) M. From this, we can derive mp < 1.33 and mc > 0.29 M respectively.
  10. Further constraints on the masses of the components of this system have been obtained from a detection of the rate of advance of periastron, which implies (assuming it is fully caused by relativistic effects) a total mass of 2.57190(73) M. The Shapiro delay was also detected and allows an estimate of the masses of the individual components: mc = 1.2064(20) M (the largest mass ever detected around a fully recycled pulsar, it could be a heavy white dwarf or another neutron star) and mp = 1.3655(21) M. This is the most precise mass ever derived for a millisecond pulsar.
  11. Further constraints on the masses of the components of this system have been obtained by bkkv06. They obtained the mass ratio from the measured orbital velocity of the white dwarf, it is 7.36 ± 0.25. Using mass-radius relations appropriate for low-mass helium-core white dwarfs, they infer mc = 0.18 ± 0.02 M, and mp = 1.40+0.16−0.10 M. If the white-dwarf spectrum and the distance of NGC 6752 are used instead to determine the white-dwarf radius, they find rc = 0.058 ± 0.004 R. For the observed temperature, the mass-radius relations predict a white-dwarf mass of mc = 0.175 ± 0.010 M, constraining mp = 1.34 ± 0.08 M. These results are consistent with those of cfpd06.
    Independent mass constraints have been obtained for this system from measurement of the Shapiro delay (cbp+12): mc = 0.180 ± 0.019 M and mp = 1.3 ± 0.2 M; these are consistent with the optical results.
  12. For the M15 C double neutron star system, the rate of advance of periastron, the relativistic gamma parameter and the orbital decay due to emission of gravitational waves have been measured, this system is now over-determined and represents therefore the first test of GR for a binary system in a globular cluster (jcj+06). mp = 1.358 ± 0.010 M and mc = 1.354 ± 0.010 M.




Fig. 1: Mass function plotted against orbital period for all known binary pulsar systems (data from the ATNF pulsar catalogue). The systems in globular clusters are indicated by the red circles; we highlight those in 47 Tuc with a ``+'' and those in Terzan 5 with a "x". Double neutron star systems are highlighted in purple. The inclined gray lines indicate a constant projected semi-major axis x = a sin i, the smallest on the lower left corner represents x = 1 light millisecond, each successive line represents an increase of x by a factor of 10. The dashed orange lines indicate, for a pulsar mass of 1.4 M and i = 90 degrees, the mass functions for the following companion masses (from top to bottom): 15 M (typical of O/B star companions), 1.4 M (typical of neutron star or heavy ONeMg WD companions), 0.2 M (typical of He WD and ``redback'' companions to millisecond pulsars), 0.03 M (typical of companions to ``black widow'' pulsars) and 0.0015 M (similar to that of the ``diamond planet'' system).




This page was last updated: 2018 Feb. 21. Added reference on timing of 47 Tuc aa. Previous updates:


Paulo C. C. Freire