2001AJ....122..908G

Query : 2001AJ....122..908G

2001AJ....122..908G - Astron. J., 122, 908-920 (2001/August-0)

A reexamination of the distribution of galactic free electrons.

GOMEZ G.C., BENJAMIN R.A. and COX D.P.

Abstract (from CDS):

We present a list of 109 pulsars with independent distance information compiled from the literature. Since the compilation of Frail & Weisberg, there are 35 pulsars with new distance estimates and 25 pulsars for which the distance or distance uncertainty have been revised. We used this data to fit a smooth, axisymmetric, two-disk model of the distribution of Galactic electrons. The two exponential model components have mean local midplane densities at the solar circle of 2.03x10–2 and 0.71x10–2 cm–3, and scale heights of 1.07 and 0.053 kpc. The thick component shows very little radial variation, while the second has a radial scale length of only a few kiloparsecs. We also examined a model that varies as sech2x, rather than exp(-x), in both the radial and vertical directions. We prefer this model with no midplane cusp but find that the fit parameters essentially describe the same electron distribution. The distances predicted by this distribution have a similar scatter to that produced by the more complex model of Taylor & Cordes. We examine the pulsars that deviate strongly from this model. There are two regions of enhanced dispersion measure, one of which correlates well with the Sagittarius-Carina spiral arm. We find that the scatter of the observed dispersion measure from the model is not fitted well by either a normal or a lognormal distribution of lump sizes but may be caused instead by the uncertainties in the distances.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: ISM - Galaxy: Structure - ISM: H II Regions - ISM: General - Stars: Pulsars: General

CDS comments: Notes: 1740-53 = PSR J1740-5340, 1807-24 = PSR J1807-2459, 1910-59 = PSR J1910-59, 1701-30 = PSR J1701-3006

Simbad objects: 139

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Number of rows : 139
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 J0024-7204C Psr 00 23 50.371 -72 04 31.44           ~ 65 1
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 PSR J0045-7319 HXB 00 45 35.2606875816 -73 19 03.269105220   15.97 16.18   16.30 B0.5-B2IV-V 193 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 PSR J0108-1431 Psr 01 08 08.29 -14 31 48.5           ~ 113 0
6 PSR B0138+59 Psr 01 41 39.938 +60 09 32.30     12.85     ~ 120 0
7 PSR B0329+54 Psr 03 32 59.3370698592 +54 34 45.028206408           ~ 690 1
8 PSR B0355+54 Psr 03 58 53.7165 +54 13 13.727           ~ 465 1
9 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 1032 0
10 PSR B0456-69.8 Psr 04 55 47.55 -69 51 34.3           ~ 21 0
11 PSR B0502-66.5 Psr 05 02 50.53 -66 17 58.8           ~ 16 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
13 PSR B0529-66.9 Psr 05 29 50.90000 -66 52 39.9000           ~ 42 0
14 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
15 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
16 PSR B0656+14 Psr 06 59 48.18800 +14 14 19.2000   24.85 24.90     ~ 943 1
17 PSR B0736-40 Psr 07 38 32.2620 -40 42 39.420           ~ 212 0
18 PSR B0740-28 Psr 07 42 49.0730 -28 22 43.510           ~ 445 0
19 PSR B0823+26 Psr 08 26 51.5068 +26 37 21.297           ~ 541 1
20 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
21 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
22 PSR B0835-41 Psr 08 37 21.1943 -41 35 14.563     12.69     ~ 149 0
23 PSR B0905-51 Psr 09 07 15.90100 -51 57 59.3600           ~ 82 0
24 PSR B0906-49 Psr 09 08 35.46000 -49 13 05.0000           ~ 168 0
25 PSR B0919+06 Psr 09 22 13.85000 +06 38 19.0000           ~ 329 1
26 PSR B0940-55 Psr 09 42 14.88000 -55 52 55.1000           ~ 101 0
27 PSR B0950+08 Psr 09 53 09.31210 +07 55 36.9000           ~ 806 2
28 PSR B0959-54 Psr 10 01 37.85000 -55 07 07.8000           ~ 113 0
29 PSR B1046-58 Psr 10 48 13.10000 -58 32 03.0000           ~ 293 0
30 PSR B1054-62 Psr 10 56 25.5840 -62 58 47.690           ~ 94 0
31 PSR B1154-62 Psr 11 57 15.2070 -62 24 50.930           ~ 118 0
32 PSR B1221-63 Psr 12 24 22.2740 -64 07 53.834           ~ 122 0
33 PSR B1240-64 Psr 12 43 17.2912183824 -64 23 23.082548820           ~ 119 0
34 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
35 PSR J1312+1810 Psr 13 12 55 +18 10.0           ~ 44 1
36 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
37 PSR B1323-58 Psr 13 26 58.2170 -58 59 29.290           ~ 82 0
38 PSR B1323-62 Psr 13 27 17.1760 -62 22 45.460           ~ 100 0
39 PSR B1338-62 Psr 13 41 42.63 -62 20 20.7           ~ 152 1
40 SNR G308.8-00.1 SNR 13 42 30 -62 23.0           ~ 51 1
41 PSR B1356-60 Psr 13 59 58.2480 -60 38 07.550           ~ 131 0
42 PSR B1358-63 Psr 14 01 52.45000 -63 57 42.0000           ~ 83 0
43 PSR B1449-64 Psr 14 53 32.6546 -64 13 16.047           ~ 158 0
44 PSR B1451-68 Psr 14 56 00.0175876848 -68 43 40.034742348           ~ 203 0
45 3A 1510-590 Psr 15 13 17.000 -59 04 54.00           ~ 434 3
46 PSR B1509-58 Psr 15 13 47.6 -59 07 54     13.06     ~ 879 1
47 PSR J1518+0204B Psr 15 18 31.458 +02 05 15.47           ~ 46 1
48 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
49 PSR B1534+11 Psr 15 37 09.9603 +11 55 55.554           ~ 453 1
50 PSR B1556-44 Psr 15 59 41.5290 -44 38 45.740           ~ 140 0
51 PSR B1557-50 Psr 16 00 53.0150 -50 44 21.300           ~ 119 0
52 PSR B1558-50 Psr 16 02 18.7300 -51 00 06.100           ~ 104 0
53 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
54 PSR B1620-26 Psr 16 23 38.2218 -26 31 53.769     21.30     ~ 318 2
55 PSR B1639+36A Psr 16 41 40.880 +36 27 15.44           ~ 49 1
56 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
57 PSR B1641-45 Psr 16 44 49.28482 -45 59 09.6360     12.60     ~ 217 0
58 PSR B1648-42 Psr 16 51 48.79700 -42 46 09.9700           ~ 72 0
59 PSR J1701-30 Psr 17 01 12.513 -30 06 30.13           ~ 19 2
60 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
61 PSR B1703-40 Psr 17 07 21.78000 -40 53 55.1000           ~ 55 0
62 PSR B1706-44 Psr 17 09 42.62000 -44 29 12.0000     13.30     ~ 670 1
63 PSR J1713+0747 Psr 17 13 49.5367813 +07 47 37.450240           ~ 530 1
64 PSR B1718-19 Psr 17 21 01.48 -19 36 51.0           ~ 97 1
65 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
66 PSR B1718-35 Psr 17 21 32.76 -35 32 48.3           ~ 86 0
67 PSR B1737-30.2 Psr 17 40 33.98000 -30 15 22.0000           ~ 236 0
68 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
69 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
70 PSR J1744-1134 Psr 17 44 29.4220844 -11 34 54.801320           ~ 323 1
71 PSR B1742-30 Psr 17 45 56.30810 -30 40 23.3000           ~ 182 0
72 PSR B1744-24A Psr 17 48 02.249 -24 46 37.65           ~ 235 0
73 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
74 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
75 PSR B1745-20A Psr 17 48 52.689 -20 21 39.70     10.55     ~ 47 1
76 PSR B1749-28 Psr 17 52 58.70700 -28 06 36.0000           ~ 277 1
77 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
78 PSR B1757-24 Psr 18 01 00.016 -24 51 27.50           ~ 258 1
79 PSR B1758-23 Psr 18 01 19.8149 -23 04 44.630           ~ 153 0
80 NAME Milne 56 SNR 18 02 10.000 -24 54 00.00           ~ 182 3
81 PSR B1800-21 Psr 18 03 51.40000 -21 37 07.0000           ~ 278 1
82 NGC 6539 GlC 18 04 49.74 -07 35 09.1           ~ 247 0
83 PSR J1802-07 Psr 18 04 49.8954 -07 35 24.690     12.33     ~ 101 2
84 W 30 SNR 18 05 31.2011719 -21 25 48.001099           ~ 188 1
85 PSR J1807-2459 Psr 18 07 20.36 -24 59 52.6           ~ 20 2
86 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 332 0
87 PSR B1804-08 Psr 18 07 38.02590 -08 47 43.2800           ~ 139 0
88 PSR B1818-04 Psr 18 20 52.5920 -04 27 37.120           ~ 230 0
89 PSR B1821+05 Psr 18 23 30.9731 +05 50 24.310           ~ 136 0
90 PSR J1820-30A Psr 18 23 40.4842 -30 21 39.920           ~ 168 1
91 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
92 PSR B1821-19 Psr 18 24 00.43600 -19 45 44.5000           ~ 101 0
93 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
94 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
95 PSR B1822-09 Psr 18 25 30.62000 -09 35 22.0000           ~ 382 0
96 PSR B1829-08 Psr 18 32 37.01300 -08 27 03.1600           ~ 79 0
97 PSR B1830-08 Psr 18 33 40.24500 -08 27 30.9000           ~ 155 1
98 PSR B1845-01 Psr 18 48 23.59600 -01 23 58.4800           ~ 154 0
99 PSR B1849+00 Psr 18 52 27.42 +00 32 02.0           ~ 76 0
100 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
101 PSR B1853+01 Psr 18 56 10.65 +01 13 21.3           ~ 211 1
102 PSR B1855+09 Psr 18 57 36.390620 +09 43 17.20712           DA 569 1
103 PSR B1855+02 Psr 18 57 43.65400 +02 12 41.0000           ~ 65 0
104 PSR B1857-26 Psr 19 00 47.54200 -26 00 44.8000           ~ 195 1
105 PSR B1859+03 Psr 19 01 31.7700 +03 31 04.960           ~ 156 0
106 PSR B1859+07 Psr 19 01 39.02000 +07 16 33.6000     14.03     ~ 88 0
107 PSR B1900+05 Psr 19 02 42.60000 +05 56 25.8000           ~ 86 0
108 PSR B1900+06 Psr 19 02 50.27700 +06 16 33.4100           ~ 66 0
109 PSR B1900+01 Psr 19 03 29.9860 +01 35 38.530           ~ 133 0
110 PSR B1904+06 Psr 19 06 35.244 +06 41 02.90           ~ 55 0
111 PSR B1907+10 Psr 19 09 48.6222922872 +11 02 02.884778124     13.61     ~ 155 0
112 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
113 PSR B1908+00A Psr 19 11 11.02 +01 02 10.9           ~ 51 0
114 NGC 6760 GlC 19 11 12.06 +01 01 49.7   11.37 9.78     ~ 264 0
115 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 99 1
116 PSR B1913+10 Psr 19 15 29.99300 +10 09 43.5800           ~ 102 0
117 PSR B1914+13 Psr 19 16 58.67000 +13 12 50.0000           ~ 99 0
118 PSR B1915+13 Psr 19 17 39.79400 +13 53 57.1600           ~ 190 0
119 PSR B1919+21 Psr 19 21 44.815 +21 53 02.25           ~ 411 0
120 PSR B1920+21 Psr 19 22 53.531 +21 10 41.97           ~ 98 0
121 PSR B1930+20 Psr 19 32 08.023 +20 20 46.41           ~ 87 0
122 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 801 0
123 PSR B1930+22 Psr 19 32 22.8565447656 +22 20 52.063074024     14.52     ~ 149 0
124 PSR B1933+16 Psr 19 35 47.7011639352 +16 16 40.034899524           ~ 328 1
125 PSR B1937+21.4 Psr 19 39 38.560096 +21 34 59.13552           ~ 1142 0
126 PSR B1944+17 Psr 19 46 53.044 +18 05 41.24           ~ 252 0
127 SNR G068.8+02.6 SNR 19 52 55 +32 54.2           ~ 361 1
128 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 615 2
129 PSR B2002+31 Psr 20 04 52.286 +31 37 10.01           ~ 138 0
130 PSR B2016+28 Psr 20 18 03.8999255016 +28 39 54.940329468           ~ 374 0
131 PSR B2020+28 Psr 20 22 37.0671 +28 54 23.104           ~ 330 1
132 PSR B2021+51 Psr 20 22 49.8730 +51 54 50.233           ~ 288 1
133 PSR B2111+46 Psr 21 13 24.3295 +46 44 08.844           ~ 226 1
134 PSR B2127+11 Psr 21 29 58.24650 +12 10 01.2339           ~ 102 2
135 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
136 PSR B2255+58 Psr 22 57 57.744 +59 09 14.83     12.59     ~ 96 0
137 PSR B2319+60 Psr 23 21 55.213 +60 24 30.71     13.80     ~ 200 0
138 PSR B2334+61 Psr 23 37 05.779 +61 51 01.69           ~ 206 1
139 SNR G114.3+00.3 SNR 23 37 05.780 +61 51 01.69           ~ 130 1

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