2024ApJ...974...10O

Query : 2024ApJ...974...10O

2024ApJ...974...10O - Astrophys. J., 974, 10 (2024/October-2)

Implications for Galactic Electron Density Structure from Pulsar Sightlines Intersecting H II Regions.

OCKER S.K., ANDERSON L.D., LAZIO T.J.W., CORDES J.M. and RAVI V.

Abstract (from CDS):

Recent radio surveys have revealed pulsars with dispersion and scattering delays induced by ionized gas that are larger than the rest of the observed pulsar population, in some cases with electron column densities (or dispersion measures, DMs) larger than the maximum predictions of Galactic electron density models. By cross-matching the observed pulsar population against H II region catalogs, we show that the majority of pulsars with DM > 600 pc cm–3 and scattering delays τ(1 GHz) > 10 ms lie behind H II regions, and that H II region intersections may be relevant to as much as a third of the observed pulsar population. The fraction of the full pulsar population with sightlines intersecting H II regions is likely larger. Accounting for H II regions resolves apparent discrepancies where Galactic electron density models place high-DM pulsars beyond the Galactic disk. By comparing emission measures inferred from recombination line observations to pulsar DMs, we show that H II regions can contribute tens to hundreds of parsecs per cubic centimeter in electron column density along a pulsar line of sight. We find that nearly all pulsars with significant excess (and deficit) scattering from the mean τ-DM relation are spatially coincident with known discrete ionized gas structures, including H II regions. Accounting for H II regions is critical to the interpretation of radio dispersion and scattering measurements as electron density tracers, both in the Milky Way and in other galaxies.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interstellar medium - Interstellar scintillation - H II regions - Pulsars - Radio transient sources - Interstellar plasma - Warm ionized medium - Neutron stars - Stellar-interstellar interactions - Recombination - Radio bursts

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 173

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Number of rows : 173
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 NAME Eri Bubble HI 03 52 -02.0           ~ 148 0
2 SH 2-205 HII 03 52 14 +53 25.0           ~ 40 0
3 PSR B0353+52 Psr 03 57 44.8403 +52 36 57.493           ~ 42 0
4 PSR B0355+54 Psr 03 58 53.7165 +54 13 13.727           ~ 465 1
5 PSR B0447-12 Psr 04 50 08.79030 -12 48 07.0880           ~ 68 0
6 SNR G160.8+02.6 SNR 05 01 00.000 +46 40 00.00           ~ 233 0
7 PSR B0458+46 Psr 05 02 04.561 +46 54 06.09           ~ 96 0
8 NAME Barnard's Loop HII 05 27.5 -03 58           ~ 131 1
9 NAME lam Ori Molecular Ring HII 05 35.3 +09 56           ~ 82 1
10 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 976 3
11 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
12 PSR B0559-05 Psr 06 01 58.97310 -05 27 50.9200           ~ 102 0
13 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
14 PSR J0646+0905 Psr 06 46 31.02500 +09 05 49.6000           ~ 16 0
15 NAME GUM Nebula ISM 07 43 -42.1           ~ 454 1
16 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
17 PSR B0835-41 Psr 08 37 21.1943 -41 35 14.563     12.69     ~ 149 0
18 PSR J0857-4424 Psr 08 57 55.8823806144 -44 24 10.616717376           ~ 39 0
19 PSR B0950+08 Psr 09 53 09.31210 +07 55 36.9000           ~ 806 2
20 PSR B1015-56 Psr 10 17 12.83100 -56 21 30.5170     14.40     ~ 52 0
21 GUM 32 HII 10 46 11.5 -58 39 12           ~ 16 1
22 PSR B1044-57 Psr 10 46 18.81500 -58 13 51.8900           ~ 43 0
23 PSR B1054-62 Psr 10 56 25.5840 -62 58 47.690           ~ 94 0
24 PSR B1112-60 Psr 11 14 22.69000 -61 00 32.1000           ~ 37 0
25 PSR B1131-62 Psr 11 33 51.30000 -62 50 51.0000           ~ 33 0
26 PSR J1138-6207 Psr 11 38 21.62 -62 07 59.3           ~ 26 0
27 PSR J1305-6203 Psr 13 05 20.90 -62 03 21.6           ~ 26 0
28 PSR J1316-6232 Psr 13 16 46.30 -62 32 12.2           ~ 10 0
29 PSR B1323-62 Psr 13 27 17.1760 -62 22 45.460           ~ 100 0
30 PSR B1334-61 Psr 13 38 09.24700 -62 04 18.7000           ~ 36 0
31 PSR B1338-62 Psr 13 41 42.63 -62 20 20.7           ~ 152 1
32 PSR J1349-6130 Psr 13 49 36.65 -61 30 17.1           ~ 33 0
33 PSR B1356-60 Psr 13 59 58.2480 -60 38 07.550           ~ 131 0
34 PSR J1406-6121 Psr 14 06 50.04 -61 21 27.9           ~ 29 0
35 RCW 83 HII 14 08.7 -62 04           ~ 7 0
36 PSR J1412-6145 Psr 14 12 07.69 -61 45 28.8           ~ 45 1
37 PSR J1413-6141 Psr 14 13 09.87 -61 41 13.0           ~ 44 1
38 PSR J1511-5835 Psr 15 11 07.0 -58 35 28           ~ 9 0
39 PSR B1508-57 Psr 15 12 43.13000 -58 00 00.4300           ~ 52 0
40 PSR J1514-5925 Psr 15 14 59.10 -59 25 43.3           ~ 26 0
41 PSR B1523-55 Psr 15 27 40.73400 -55 52 08.3520           ~ 36 0
42 PSR J1543-5459 Psr 15 43 56.25 -54 59 13.7           ~ 25 0
43 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 463 1
44 PSR J1551-5310 Psr 15 51 41.25 -53 10 59.6           ~ 24 0
45 LBN 1093 HII 15 58.8 -26 07           ~ 15 0
46 LBN 1099 HII 16 00.6 -22 56           ~ 22 0
47 PSR J1600-3053 Psr 16 00 51.902514 -30 53 49.45343           ~ 218 0
48 PSR J1614-5048 Psr 16 14 11.29 -50 48 03.5           ~ 128 0
49 PSR J1614-2230 Psr 16 14 36.50974 -22 30 31.5420           ~ 452 1
50 LBN 006.00+24.73 HII 16 35 56.8 -12 43 05           ~ 76 0
51 PSR B1636-47 Psr 16 40 13.19 -47 15 35.3           ~ 36 0
52 PSR J1643-1224 Psr 16 43 38.16612 -12 24 58.6334           ~ 260 2
53 PSR B1641-45 Psr 16 44 49.28482 -45 59 09.6360     12.60     ~ 217 0
54 AJG 54 HII 16 45 18.0 -46 09 11           ~ 32 1
55 PSR B1703-40 Psr 17 07 21.78000 -40 53 55.1000           ~ 55 0
56 SNR G343.1-02.3 SNR 17 08.0 -44 16           ~ 82 1
57 PSR B1706-44 Psr 17 09 42.62000 -44 29 12.0000     13.30     ~ 670 1
58 PSR J1715-3859 Psr 17 15 37.89 -38 59 25.1           ~ 9 0
59 PSR J1717-3737 Psr 17 17 15.96 -37 37 36.0           ~ 8 0
60 PSR B1714-34 Psr 17 17 20.30000 -34 25 00.3100           ~ 55 0
61 GRS G350.10 +00.10 HII 17 18.4 -37 12           ~ 4 0
62 SH 2-10 HII 17 19.0 -34 05           ~ 8 0
63 PSR J1720-3659 Psr 17 20 02.0050309104 -36 59 07.478417112           ~ 10 0
64 BFS 65 HII 17 20 06.91 -38 57 34.1           ~ 81 1
65 SH 2-8 HII 17 21.5 -36 02           ~ 16 0
66 PSR B1718-35 Psr 17 21 32.76 -35 32 48.3           ~ 86 0
67 PSR B1718-36 Psr 17 22 09.817 -36 32 53.30           ~ 35 0
68 PSR J1723-3659 Psr 17 23 07.580 -36 59 13.90           ~ 45 0
69 RCW 128 HII 17 23.8 -36 18           ~ 3 0
70 SH 2-13 HII 17 30.4 -31 33           ~ 7 0
71 PSR B1727-33 Psr 17 30 32.559 -33 50 39.40           ~ 130 1
72 PSR J1731-3123 Psr 17 31 00.5 -31 23 43           ~ 7 0
73 [ABB2014] WISE G354.175-00.062 bub 17 31 14.9 -33 52 55           ~ 10 0
74 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
75 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 358 0
76 PSR J1745-2912 Psr 17 45 50 -29 12.0           ~ 14 0
77 PSR J1746-2849 Psr 17 46 03.7 -28 49 19           ~ 22 0
78 PSR J1746-2856 Psr 17 46 49.50 -28 56 31.0           ~ 28 0
79 LBN 3 HII 17 47 08.0 -28 46 30           ~ 83 3
80 PSR J1753-2501 Psr 17 53 30.61 -25 00 25.0           ~ 29 0
81 LBN 004.60+00.29 HII 17 55.1 -25 01           ~ 11 0
82 PSR B1754-24 Psr 17 57 29.37000 -24 19 54.0000           ~ 102 0
83 PSR B1758-23 Psr 18 01 19.8149 -23 04 44.630           ~ 153 0
84 PSR B1809-17.6 Psr 18 11 55.034 -17 36 37.70           ~ 114 1
85 PSR B1809-17.3 Psr 18 12 07.208 -17 18 29.50           ~ 33 0
86 LBN 012.71+00.37 HII 18 12 10.7 -17 42 48           ~ 17 0
87 PSR B1809-17.5 Psr 18 12 15.89 -17 33 37.0           ~ 26 0
88 NAME AGPS 273.4-17.8 SNR 18 13 35.05 -17 49 58.1           ~ 145 2
89 W 33 SFR 18 14 14.0 -17 55 50           ~ 292 0
90 PSR J1816-1729 Psr 18 16 18.662 -17 29 02.70           ~ 33 0
91 SH 2-43 HII 18 16.4 -17 24           ~ 6 0
92 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 60 1
93 PSR B1815-14 Psr 18 18 23.77000 -14 22 39.0000           ~ 61 0
94 SH 2-49 HII 18 19.0 -13 52           ~ 33 1
95 PSR J1819-1114 Psr 18 19 28.78 -11 14 43.0           ~ 7 0
96 PSR B1817-13 Psr 18 20 19.759 -13 46 15.30           ~ 36 0
97 PSR B1819-14 Psr 18 22 54.042 -14 00 02.40           ~ 34 0
98 PSR B1820-11 Psr 18 23 40.30000 -11 15 11.0000           ~ 85 2
99 PSR J1824-1159 Psr 18 24 56.151 -11 59 53.40           ~ 8 0
100 PSR J1824-1423 Psr 18 24 57.4986292872 -14 23 04.733371824           ~ 11 0
101 PSR B1822-14 Psr 18 25 02.927 -14 46 52.60           ~ 92 0
102 LBN 016.31-00.12 HII 18 25.6 -14 42           ~ 13 0
103 PSR B1823-11 Psr 18 26 05.472 -11 31 43.60           ~ 31 0
104 PSR B1829-10 Psr 18 32 40.866 -10 21 32.78           ~ 73 0
105 PSR J1833-0559 Psr 18 33 07.60 -05 59 25.0           ~ 9 0
106 PSR B1830-08 Psr 18 33 40.24500 -08 27 30.9000           ~ 155 1
107 PSR J1834-0731 Psr 18 34 16.0 -07 31 07           ~ 29 0
108 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 231 0
109 PSR B1832-06 Psr 18 35 05.56 -06 43 06.9     13.18     ~ 63 0
110 PSR B1835-06.1 Psr 18 37 43.55 -06 04 49.0           ~ 77 0
111 PSR J1841-0500 Psr 18 41 18.14 -05 00 19.5           ~ 54 0
112 [ABB2014] WISE G027.281-00.132 HII 18 41 35 -05 05.3           ~ 2 0
113 PSR J1844-0030 Psr 18 44 41.10 -00 30 25.8           ~ 10 0
114 PSR J1849-0013 Psr 18 49 26.996 -00 13 46.80           ~ 3 0
115 PSR B1847+01.3 Psr 18 49 44.18 +01 27 23.0           ~ 13 0
116 PSR J1850-0026 Psr 18 50 14.714 -00 26 11.60           ~ 23 1
117 PSR J1850-0006 Psr 18 50 47.93 -00 06 26.1           ~ 14 0
118 PSR J1852-0127 Psr 18 52 03.60 -01 27 23.4           ~ 8 0
119 GPPS 14 Psr 18 52 14.0 +00 56 00           ~ 2 0
120 PSR B1849+00 Psr 18 52 27.42 +00 32 02.0           ~ 76 0
121 PSR J1853+0546 Psr 18 53 04.36 +05 05 26.1           ~ 21 0
122 PSR J1853+0545 Psr 18 53 58.418 +05 45 55.20           ~ 24 0
123 GPPS 117 Psr 18 54 34.0 +01 31 00           ~ 2 0
124 [ABB2014] WISE G038.123+01.660 HII 18 55 00 +05 22.7           ~ 2 0
125 [KB94] 24 HII 18 55 09.1 +01 46 18           ~ 5 0
126 PSR B1853+04.3 Psr 18 55 41.37 +04 22 47.0           ~ 7 0
127 PSR J1855+0205 Psr 18 55 42 +02 05.6           ~ 4 0
128 [ABB2014] WISE G037.642+01.192 HII 18 55 47 +04 44.2           ~ 2 0
129 PSR B1853+01 Psr 18 56 10.65 +01 13 21.3           ~ 211 1
130 PSR J1856+0404 Psr 18 56 26.6 +04 04 26           ~ 11 0
131 PSR J1856+0245 Psr 18 56 50.80 +02 45 50.2           ~ 51 0
132 PSR J1857+0526 Psr 18 57 15.8572328808 +05 26 31.118999388           ~ 19 0
133 PSR B1855+02.1 Psr 18 57 40.90 +02 10 58.0           ~ 16 0
134 PSR B1855+02 Psr 18 57 43.65400 +02 12 41.0000           ~ 65 0
135 PSR J1858+0215 Psr 18 58 17.43 +02 15 38.0           ~ 10 0
136 PSR J1858+0346 Psr 18 58 22 +03 46.7           ~ 7 0
137 PSR J1859+0601 Psr 18 59 45.76 +06 01 46.1           ~ 9 0
138 [ABB2014] WISE G039.283+00.865 HII 18 59 58 +06 02.8           ~ 1 0
139 PSR B1859+03 Psr 19 01 31.7700 +03 31 04.960           ~ 156 0
140 PSR B1859+01 Psr 19 01 34.288 +01 56 38.22           ~ 43 0
141 PSR B1859+07 Psr 19 01 39.02000 +07 16 33.6000     14.03     ~ 88 0
142 PSR B1900+01 Psr 19 03 29.9860 +01 35 38.530           ~ 133 0
143 [ABB2014] WISE G039.294-00.311 HII 19 04 12 +05 31.1           ~ 1 0
144 PSR B1902+06.1 Psr 19 05 06.849 +06 16 16.70           ~ 26 0
145 PSR B1905+07.5 Psr 19 07 44.118 +07 40 22.60           ~ 15 0
146 PSR B1907+05.4 Psr 19 10 26.51 +05 34 09.0           ~ 9 0
147 PSR J1913+1000 Psr 19 13 03.59 +10 00 02.4           ~ 18 0
148 PSR B1913+10.5 Psr 19 16 11.72 +10 30 53.4     13.84     ~ 12 0
149 PSR J1919+1745 Psr 19 19 43 +17 45.0           ~ 8 0
150 PSR J1920+1110 Psr 19 20 13.31 +11 10 59.0           ~ 12 0
151 PSR B1919+14 Psr 19 21 24.159 +14 19 17.10           ~ 78 0
152 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
153 PSR J1924+1631 Psr 19 24 55 +16 31.8           ~ 11 0
154 PSR B1930+22 Psr 19 32 22.8565447656 +22 20 52.063074024     14.52     ~ 149 0
155 LBN 059.38-00.15 HII 19 43 12 +23 15.0           ~ 25 1
156 PSR J1946+2535 Psr 19 46 49 +25 35.9           ~ 7 0
157 PSR J1949+2306 Psr 19 49 07 +23 06.9           ~ 8 0
158 PSR J1953+2732 Psr 19 53 08 +27 32.8           ~ 8 0
159 GPPS 77 Psr 20 05 45.0 +34 11 00           ~ 2 0
160 PSR B2011+38 Psr 20 13 10.367 +38 45 43.31           ~ 78 0
161 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 270 1
162 GPPS 87 Psr 20 21 12.9 +40 24 00           ~ 5 0
163 GPPS 76 Psr 20 22 11.4 +38 45 00           ~ 3 0
164 PSR J2022+3842 Psr 20 22 21.689 +38 42 14.82           ~ 66 0
165 PSR B2027+37 Psr 20 29 23.872 +37 44 08.17           ~ 46 0
166 GPPS 187 Psr 20 30 08.5 +38 18 00           ~ 4 0
167 GPPS 118 Psr 20 30 21.5 +39 44 00           ~ 4 0
168 GPPS 152 Psr 20 30 47.2 +39 29 00           ~ 3 0
169 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0
170 GPPS 19 Psr 20 52 53.2 +44 21 00           ~ 5 0
171 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 427 0
172 PSR B2106+44 Psr 21 08 20.57 +44 41 49.4           ~ 71 1
173 NAME Local Bubble ISM ~ ~           ~ 1059 0

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