1999MNRAS.306L..50J

Query : 1999MNRAS.306L..50J

1999MNRAS.306L..50J - Mon. Not. R. Astron. Soc., 306, L50-L54 (1999/July-2)

Pulsar braking indices revisited.

JOHNSTON S. and GALLOWAY D.

Abstract (from CDS):

Using the standard equation for the slowdown of a neutron star, we derive a formula for the braking index via integration rather than the conventional differentiation. The new formula negates the need to measure the second time derivative of the rotation frequency, ν". We show that the method gives similar braking indices for PSR B1509-58 and the Crab pulsar to those already in the literature. We point out that our method is useful for obtaining the braking indices of moderate-aged pulsars without the need for long, phase-connected timing solutions. We applied the method to 20 pulsars and discuss the implications of the results. We find that virtually all the derived braking indices are dominated by the effects of (unseen) glitches, the recovery from which corrupts the value of ν{dot}. However, any real, large, positive braking index has implications for magnetic field decay and offers support to recent models of pulsar evolution.

Abstract Copyright: 1999 RAS

Journal keyword(s): pulsars: general

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR B0114+58 Psr 01 17 38.661 +59 14 38.39           ~ 96 0
2 PSR B0136+57 Psr 01 39 19.744 +58 14 31.73     13.41     ~ 163 0
3 PSR B0154+61 Psr 01 57 49.9434 +62 12 26.648           ~ 127 0
4 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
5 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
6 PSR B0540+23 Psr 05 43 09.65 +23 29 06.1     14.40     ~ 278 0
7 PSR B0611+22 Psr 06 14 17.0324288405 +22 29 57.017874999           ~ 285 0
8 PSR J0631+10 Psr 06 31 27.369 +10 37 05.63           ~ 152 0
9 PSR B0656+14 Psr 06 59 48.18800 +14 14 19.2000   24.85 24.90     ~ 943 1
10 PSR B0740-28 Psr 07 42 49.0730 -28 22 43.510           ~ 445 0
11 PSR B0906-49 Psr 09 08 35.46000 -49 13 05.0000           ~ 168 0
12 PSR B0919+06 Psr 09 22 13.85000 +06 38 19.0000           ~ 329 1
13 PSR B1221-63 Psr 12 24 22.2740 -64 07 53.834           ~ 122 0
14 PSR B1356-60 Psr 13 59 58.2480 -60 38 07.550           ~ 131 0
15 PSR B1509-58 Psr 15 13 47.6 -59 07 54     13.06     ~ 879 1
16 PSR B1643-43 Psr 16 46 50.86 -43 45 53.7           ~ 77 1
17 PSR B1719-37 Psr 17 22 59.17000 -37 12 03.0000           ~ 107 0
18 PSR B1742-30 Psr 17 45 56.30810 -30 40 23.3000           ~ 182 0
19 PSR B1829-08 Psr 18 32 37.01300 -08 27 03.1600           ~ 79 0
20 PSR B1853+01 Psr 18 56 10.65 +01 13 21.3           ~ 211 1
21 PSR B1907+10 Psr 19 09 48.6222922872 +11 02 02.884778124     13.61     ~ 155 0
22 PSR B1915+09 Psr 19 16 32.33300 +09 51 25.9700           ~ 100 0
23 PSR B1915+13 Psr 19 17 39.79400 +13 53 57.1600           ~ 190 0
24 PSR B1930+22 Psr 19 32 22.8565447656 +22 20 52.063074024     14.52     ~ 149 0
25 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 615 2
26 PSR B2000+32 Psr 20 02 04.424 +32 17 18.31           ~ 51 0
27 PSR B2002+31 Psr 20 04 52.286 +31 37 10.01           ~ 138 0
28 PSR B2148+52 Psr 21 50 37.7499 +52 47 49.556           ~ 46 0
29 PSR B2334+61 Psr 23 37 05.779 +61 51 01.69           ~ 206 1

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