2006MNRAS.365L...1R

Query : 2006MNRAS.365L...1R

2006MNRAS.365L...1R - Mon. Not. R. Astron. Soc., 365, L1-L5 (2006/January-1)

A multiwavelength investigation of the temperature of the cold neutral medium.

ROY N., CHENGALUR J.N. and SRIANAND R.

Abstract (from CDS):

We present measurements of the HI spin temperatures (Ts) of the cold neutral medium (CNM) towards radio sources that are closely aligned with stars for which published H2ortho-para temperatures (T01) are available from ultraviolet (UV) observations. Our sample consists of 18 radio sources close to 16 nearby stars. The transverse separation of the lines of sight of the corresponding UV and radio observations varies from 0.1 to 12.0 pc at the distance of the star. The UV measurements do not have velocity information, so we use the velocities of low ionization species (e.g. Nai/Ki/Ci) observed towards these same stars to make a plausible identification of the CNM corresponding to the H2absorption. We then find that T01 and Tsmatch within observational uncertainties for lines of sight with H2column density above 1015.8/cm2, but deviate from each other below this threshold. This is consistent with the expectation that in the CNM Tstracks the kinetic temperature due to collisions and that T01is driven towards the kinetic temperature by proton exchange reactions.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): ISM: atoms - ISM: molecules - radio lines: ISM - ultraviolet: ISM

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 4C 55.42 Rad 00 00 20.4 +55 39 09           ~ 8 1
2 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 654 1
3 * o Per * 03 42 22.6459308614 +33 57 54.093701142 4.13 4.912 4.972     B0.5V 299 0
4 NVSS J034227+474944 Rad 03 42 27.4 +47 49 46           ~ 4 1
5 * del Per Be* 03 42 55.4928046977 +47 47 14.988257477 2.38 2.89 3.01 2.99 3.10 B5III 319 0
6 NVSS J034300+340634 Rad 03 43 00.9 +34 06 33           ~ 5 1
7 NVSS J034440+243622 Rad 03 44 40.4 +24 36 22           ~ 4 1
8 * 20 Tau PM* 03 45 49.6081548365 +24 22 03.877565838 3.40 3.80 3.87 3.85 3.90 B8III 434 1
9 * 23 Tau Be* 03 46 19.5858871361 +23 56 54.092177220 3.70 4.12 4.18   4.16 B6IV(e) 432 2
10 4C 47.10 Rad 03 46 29.6 +47 46 37           ~ 4 1
11 3C 93.1 BLL 03 48 46.9073426592 +33 53 15.461439576   20.723   19.110   ~ 131 1
12 * del Ori SB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 779 0
13 PMN J0534-0044 Rad 05 34 13.3457140680 -00 44 09.408860988           ~ 4 1
14 * phi01 Ori Y*O 05 34 49.2376273598 +09 29 22.510380606 3.29 4.26 4.41 4.42 4.59 B0III 258 0
15 4C 09.21 Rad 05 34 50.80 +10 04 30.0           ~ 11 0
16 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 509 0
17 PMN J0535-0124 Rad 05 35 50.6 -01 24 48           ~ 3 1
18 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 896 0
19 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 666 0
20 AT20G J054409-091740 AGN 05 44 09.2 -09 17 28           ~ 6 1
21 * kap Ori s*b 05 47 45.3888404 -09 40 10.577707 0.87 1.88 2.06 2.09 2.27 B0.5Ia 569 0
22 NVSS J055703+261119 Rad 05 57 03.1 +26 11 17           ~ 4 1
23 * 139 Tau s*b 05 57 59.6569390499 +25 57 14.083803544 3.82 4.76 4.82 4.76 4.87 B1Ia 281 0
24 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.45 4.68   4.88 O7V+B1.5/2V 803 0
25 4C 09.25 Rad 06 41 45.19783328 +09 47 04.3303315           ~ 19 1
26 PKS 0715-249 Rad 07 17 17.7 -25 04 56           ~ 18 1
27 NVSS J071741-241542 Rad 07 17 41.2 -24 15 42           ~ 2 0
28 * 29 CMa SB* 07 18 40.3789353696 -24 33 31.318248528 3.80 4.80 4.95 4.95 5.08 O7Iafpvar 417 0
29 * tau CMa SB* 07 18 42.4849951654 -24 57 15.700749738 3.26 4.25 4.40 4.44 4.62 O9II 422 0
30 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 740 0
31 NVSS J160052-221214 Rad 16 00 53.0 -22 12 13           ~ 3 1
32 ICRF J160401.4-222340 AGN 16 04 01.47174802 -22 23 40.9881985   21.0       ~ 39 1
33 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 870 0
34 NVSS J162400-261231 Rad 16 24 00.97 -26 12 31.8           ~ 2 0
35 PMN J1636-1058 Rad 16 36 31.7 -10 58 41           ~ 3 1
36 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1839 0
37 3C 440 Rad 22 03 20.9120226528 +62 40 35.077710828   19       ~ 32 1
38 * 19 Cep * 22 05 08.7897533088 +62 16 47.332569936 4.36 5.19 5.11 4.95 4.92 O9Ib 380 0
39 * sig Cas ** 23 59 00.53819 +55 45 17.7430           B1V 151 0

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