2003ApJ...586.1067H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST07:53:58

2003ApJ...586.1067H - Astrophys. J., 586, 1067-1093 (2003/April-1)

The millennium Arecibo 21 centimeter absorption-line survey. II. Properties of the warm and cold neutral media.

HEILES C. and TROLAND T.H.

Abstract (from CDS):

We use the Gaussian fit results of Paper I to investigate the properties of interstellar H I in the solar neighborhood. The warm and cold neutral media (WNM and CNM) are physically distinct components. The CNM spin temperature histogram peaks at about 40 K; its median, weighted by column density, is 70 K. About 60% of all H I is WNM; there is no discernible change in this fraction at z=0. At z=0, we derive a volume filling fraction of about 0.50 for the WNM; this value is very rough. The upper limit WNM temperatures determined from line width range upward from ∼500 K; a minimum of about 48% of the WNM lies in the thermally unstable region 500-5000 K. The WNM is a prominent constituent of the interstellar medium, and its properties depend on many factors, requiring global models that include all relevant energy sources, of which there are many. We use principal components analysis, together with a form of least-squares fitting that accounts for errors in both the independent and dependent parameters, to discuss the relationships among the four CNM Gaussian parameters. The spin temperature Tsand column density N(H I) are, approximately, the two most important eigenvectors; as such, they are sufficient, convenient, and physically meaningful primary parameters for describing CNM clouds. The Mach number of internal macroscopic motions for CNM clouds is typically about 3 so that they are strongly supersonic, but there are wide variations. We discuss the historical τ0-T_s_relationship in some detail and show that it has little physical meaning. We discuss CNM morphology using the CNM pressure known from UV stellar absorption lines. Knowing the pressure allows us to show that CNM structures cannot be isotropic but instead are sheetlike, with length-to-thickness aspect ratios ranging up to about 280. We present large-scale maps of two regions where CNM lies in very large ``blobby sheets.'' We test the McKee/Ostriker model of the interstellar medium by explicitly modeling our data with CNM cores contained in WNM envelopes. This modeling scheme works quite well for many sources and also predicts the WNM filling factor reasonably well. However, it has several deficiencies.

Abstract Copyright:

Journal keyword(s): ISM: Atoms - ISM: Structure - Radio Lines: ISM

Simbad objects: 83

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Number of rows : 83

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 6.1 rG 00 16 31.60 +79 16 51.7   22       ~ 114 1
2 3C 18.0 Sy2 00 40 50.5 +10 03 27   18.5       ~ 142 2
3 2C 94 Sy2 01 08 52.8701245540 +13 20 14.257796477   15.19       ~ 440 2
4 3C 33.1 Sy1 01 09 44.3 +73 11 57   19.5       ~ 137 1
5 3C 64 rG 02 22 01.9 +08 26 49   19.5       ~ 43 1
6 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 284 1
7 NGC 1218 Sy1 03 08 26.2238190 +04 06 39.300921   12.84       ~ 342 1
8 3C 79.0 Sy2 03 10 00.0932580214 +17 05 58.593728115   19.54 18.75     ~ 242 3
9 ICRF J031857.8+162832 AGN 03 18 57.80262301 +16 28 32.6981890     22.0     ~ 187 1
10 4C 05.14 rG 03 23 20.2606504221 +05 34 11.893889982     19     ~ 73 1
11 4C 32.14 QSO 03 36 30.10760600 +32 18 29.3422210     17.50 16.6   ~ 580 1
12 3CR 93.1 Sy2 03 48 46.9076031514 +33 53 15.460411800   20.723   19.110   ~ 124 1
13 4C 05.16 Sy1 03 49 46.5 +05 51 42     20.9     ~ 67 1
14 2C 349 Sy2 03 58 54.4385123848 +10 26 02.820631972   16.68 15.41     ~ 320 2
15 2MASX J04071644+0342262 Sy2 04 07 16.440 +03 42 26.23   18.5       ~ 199 1
16 4C 74.08 G 04 13 18.00 +74 51 07.2     19.1     ~ 24 1
17 ICRF J041340.3+111214 Sy1 04 13 40.3430536536 +11 12 14.788657086   18.96 18.01     ~ 294 2
18 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 856 1
19 PKS 0428+205 rG 04 31 03.76136151 +20 37 34.2649550   22.174   19.085   ~ 166 1
20 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1840 2
21 NAME Per B AGN 04 37 04.37510272 +29 40 13.8184969   21.7       ~ 470 2
22 3C 131 Rad 04 53 23.3 +31 29 24           ~ 65 1
23 3C 132 rG 04 56 42.922 +22 49 23.06   18.5       ~ 143 1
24 ICRF J050258.4+251625 AGN 05 02 58.47478439 +25 16 25.2761557   20       ~ 157 1
25 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 745 1
26 4C 32.18 Rad 05 26 42.6 +32 49 58           ~ 56 1
27 UT 0526+249 Rad 05 29 10.04 +25 00 51.9           ~ 2 0
28 3C 142.1 rG 05 31 29.40 +06 30 25.0   21       ~ 81 1
29 PKS 0531+19 rG 05 34 44.5076 +19 27 21.530   17.7       ~ 48 1
30 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
31 4C 19.18 Rad 05 59 55.60 +19 08 52.0           ~ 7 1
32 4C 22.12 BLL 06 03 51.55701577 +21 59 37.6986666           ~ 32 1
33 3C 154.0 QSO 06 13 50.13917401 +26 04 36.7198424           ~ 147 0
34 2C 553 QSO 06 27 10.1 -05 53 06           ~ 148 1
35 [TR93] 062929.46+102416.5 Rad 06 32 15.33 +10 22 01.9           ~ 8 0
36 3C 167 Rad 06 45 16.8 +05 31 33           ~ 24 1
37 3C 172 rG 07 02 08.31 +25 13 53.5   20.5       ~ 114 0
38 NAME Vela Supershell sh 07 40 -22.           ~ 24 0
39 QSO B0742+103 QSO 07 45 33.05952141 +10 11 12.6923363       23.72   ~ 177 1
40 3C 190 QSO 08 01 33.5526629491 +14 14 42.815302770   21.07 20.26 18.972   ~ 220 2
41 2XMM J080535.0+240951 Sy2 08 05 35.0057673498 +24 09 50.334614040   15.46       ~ 312 1
42 4C 22.21 BLL 08 23 24.7596243194 +22 23 03.292745682   20.22 19.57 19.7   ~ 166 1
43 ICRF J084047.5+131223 Sy1 08 40 47.58841798 +13 12 23.5641152   18.58 18.15 17.622   ~ 385 1
44 3C 208 QSO 08 53 08.6094064845 +13 52 54.843245472   17.76 17.42     ~ 235 1
45 3C 208.1 QSO 08 54 39.3196153181 +14 05 51.837177793   19.95 19.47     ~ 82 2
46 7C 093653.10+360601.00 Sy2 09 39 52.7593482853 +35 53 58.921088539   19.51 18.60     ~ 255 1
47 [MMD97] 093925.20+140536.5 rG 09 42 08.47 +13 51 53.8   22       ~ 24 0
48 3C 225 rG 09 42 15.4 +13 45 51   19 20.0     ~ 116 2
49 3C 228 rG 09 50 10.7 +14 19 58   21       ~ 157 2
50 7C 095855.89+290131.00 Sy1 10 01 49.5226070599 +28 47 08.913353395   18.21 17.27     ~ 396 1
51 ICRF J100601.7+345410 Sy1 10 06 01.75030199 +34 54 10.4005583   15.97       ~ 407 2
52 3C 237.0 rG 10 08 00.0529 +07 30 16.830   21       ~ 172 0
53 4C 12.37 QSO 10 42 44.60522539 +12 03 31.2636114   18.03 17.77     ~ 406 2
54 4C 20.24 QSO 10 58 17.9001947270 +19 51 50.876963639   17.51 17.07 17.28   ~ 190 1
55 ICRF J112027.8+142054 G 11 20 27.80726 +14 20 54.9914   20 20.935 20.100   ~ 139 1
56 3C 263.1 QSO 11 43 25.083 +22 06 56.08   20       ~ 136 1
57 3C 264.0 QSO 11 45 05.0090520 +19 36 22.741257   14.98 13.97     ~ 532 2
58 3C 267 rG 11 49 56.5 +12 47 19   22.5       ~ 146 2
59 NAME North Polar Spur ISM 12 00 +00.0           ~ 301 1
60 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1634 2
61 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5316 1
62 3C 274.1 rG 12 35 31.00 +21 20 51.3   20       ~ 135 1
63 4C 07.32 rG 13 16 17.007 +07 02 46.51   15.5 15.5     ~ 51 0
64 4C 32.44 QSO 13 26 16.51232948 +31 54 09.5144454   21.367 19.822 18.882   ~ 152 1
65 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3715 1
66 UGC 8782 LIN 13 52 17.765 +31 26 46.10   16.10 15.10     ~ 419 3
67 ICRF J135704.4+191907 Sy1 13 57 04.43665381 +19 19 07.3724675   16.33 16.03 15.3   ~ 413 3
68 7C 1422+2013 QSO 14 24 56.9187781174 +20 00 26.358555839   18.09 17.65     ~ 120 1
69 VV 204 AGN 15 04 57.120 +26 00 58.46   15.24       ~ 274 0
70 4C 26.47 AGN 15 13 40.0227468596 +26 07 23.710955469   16.30       ~ 217 1
71 3C 318.0 QSO 15 20 05.4779632581 +20 16 05.487892990   21.93 20.9     ~ 175 1
72 3C 333 Rad 16 17 15.7 +21 07 29           ~ 28 1
73 NAME Hercules A BiC 16 51 08.024 +04 59 34.91     18.25     ~ 432 1
74 2C 1473 AGN 17 20 28.147 -00 58 47.12   15.36       ~ 298 1
75 4C 13.65 Rad 17 58 31.00 +13 28 34.0           ~ 23 1
76 4C 13.67 Rad 18 37 29.10 +13 30 14.0           ~ 16 1
77 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 779 0
78 3C 409 Rad 20 14 27.6 +23 34 53           ~ 81 1
79 3C 410 QSO 20 20 06.5624875736 +29 42 14.183853306   19.5       ~ 108 0
80 3C 427.1 rG 21 04 07.3 +76 33 08   23.3 21.1     ~ 145 1
81 2MASX J21234458+2504272 Sy2 21 23 44.582 +25 04 27.23   17.660 16.350     ~ 300 0
82 3C 454.0 QSO 22 51 34.7283285659 +18 48 40.085907101   18.52 18.4     ~ 209 2
83 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2505 2

    Equat.    Gal    SGal    Ecl

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2020.07.08-07:53:58

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