CDS

2010A&A...518A..45L

Query : 2010A&A...518A..45L

2010A&A...518A..45L - Astronomy and Astrophysics, volume 518, A45-45 (2010/7-2)

The CO luminosity and CO-H2 conversion factor of diffuse ISM: does CO emission trace dense molecular gas?

LISZT H.S., PETY J. and LUCAS R.

Abstract (from CDS):

We wish to separate and quantify the CO luminosity and CO-H2 conversion factor applicable to diffuse but partially-molecular ISM when H2 and CO are present but C+ is the dominant form of gas-phase carbon. We discuss galactic lines of sight observed in HI, HCO+ and CO where CO emission is present but the intervening clouds are diffuse (locally A_V≲1mag) with relatively small CO column densities NCO≲2x1016cm–2. We separate the atomic and molecular fractions statistically using EB–V as a gauge of the total gas column density and compare NH2 to the observed CO brightness. Although there are H2-bearing regions where CO emission is too faint to be detected, the mean ratio of integrated CO brightness to NH2 for diffuse ISM does not differ from the usual value of 1Kkm/s of integrated CO brightness per 2x1020 H2cm–2. Moreover, the luminosity of diffuse CO viewed perpendicular to the galactic plane is 2/3 that seen at the Solar galactic radius in surveys of CO emission near the galactic plane. Commonality of the CO-H2 conversion factors in diffuse and dark clouds can be understood from considerations of radiative transfer and CO chemistry. There is unavoidable confusion between CO emission from diffuse and dark gas and misattribution of CO emission from diffuse to dark or giant molecular clouds. The character of the ISM is different from what has been believed if CO and H2 that have been attributed to molecular clouds on the verge of star formation are actually in more tenuous, gravitationally-unbound diffuse gas.

Abstract Copyright: ∼

Journal keyword(s): ISM: molecules - ISM: clouds

Simbad objects: 103

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Number of rows : 103
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022 		#notes
1 4C 55.42 Rad 00 00 20.40 +55 39 08.0           ~ 7 1
2 NVSS J000833+683721 Rad 00 08 33.4729006 +68 37 22.048610           ~ 11 1
3 4C 60.01 Rad 00 14 48.7920640 +61 17 43.542069           ~ 28 1
4 QSO B0016+73 QSO 00 19 45.7863851568 +73 27 30.018073212     19.0 18.26   ~ 284 1
5 4C 66.02 Rad 00 44 41.3 +66 18 41           ~ 10 1
6 8C 0052+681 Sy2 00 56 01.122 +68 22 29.53           ~ 70 1
7 4C 66.03 Rad 01 00 03.9274093560 +66 50 57.201768060           ~ 7 1
8 7C 0059+5808 QSO 01 02 45.7622788272 +58 24 11.137682016   20.09 19.22 18.57 17.90 ~ 206 1
9 4C 56.02 BLL 01 10 57.5535851 +56 32 16.949199           ~ 19 1
10 ICRF J012830.5+630629 G 01 28 30.5680737000 +63 06 29.874351384           ~ 15 1
11 4C 61.04 Rad 02 09 38.3 +61 41 15           ~ 15 1
12 6C 021252+733537 BLL 02 17 30.8129232696 +73 49 32.622815712     19.0 18.97   ~ 427 1
13 4C 67.05 QSO 02 28 50.0509728096 +67 21 03.034681488   19.5   18.1   ~ 241 1
14 QSO B0235+1624 BLL 02 38 38.9300958576 +16 36 59.276150136   16.46 15.50 15.92   ~ 1457 2
15 ICRF J024457.6+622806 Sy1 02 44 57.6967097952 +62 28 06.517098084   12.15 12.19     ~ 267 1
16 4C 47.08 BLL 03 03 35.2422414360 +47 16 16.276532592   17.54 16.95 16.2   ~ 254 1
17 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3807 3
18 4C 53.07 Rad 03 36 27.9 +53 38 52           ~ 17 1
19 BP 14 SNR 03 37 43.4 +50 45 53   18       ~ 51 1
20 4C 50.11 QSO 03 59 29.7469819512 +50 57 50.159106936           ~ 417 1
21 3C 103 rG 04 08 03.16 +43 00 33.2   19       ~ 75 0
22 4C 38.13 Rad 04 09 22.42 +38 48 32.9           ~ 13 1
23 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 901 1
24 4C 41.11 QSO 04 23 56.0095667136 +41 50 02.714861652   19   19.2   ~ 92 2
25 2C 396 QSO 04 32 36.5025939 +41 38 28.449052     20.0     ~ 213 1
26 4C 58.11 Rad 04 34 56.76 +58 46 38.6           ~ 3 1
27 4C 48.13 BLL 04 38 59.1 +48 48 47           ~ 23 1
28 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4011 0
29 3C 128 Rad 04 46 46.80 +50 37 36.0           ~ 22 1
30 4C 47.15 BLL 05 02 25.88525 +47 46 04.5393           ~ 14 1
31 ICRF J051252.5+404143 BLL 05 12 52.5427197024 +40 41 43.618364844           ~ 48 1
32 QSO J0530+13 Bla 05 30 56.4168902136 +13 31 55.151893344     20.0 19.35   ~ 916 1
33 NAME Ori A MoC 05 38 -07.1           ~ 2868 0
34 7C 055201.39+394824.00 QSO 05 55 30.8055972888 +39 48 49.166341920     18.0 17.5   ~ 488 2
35 3C 152 Rad 06 04 28.60 +20 21 21.0           ~ 58 1
36 QSO B0605-0834 BLL 06 07 59.6994046176 -08 34 49.980131256     18.5 17.70   ~ 422 1
37 QSO B0607-157 QSO 06 09 40.9493089944 -15 42 40.667570496   18.47 18.0 19.90   ~ 299 1
38 4C 14.18 BLL 06 25 45.9222413976 +14 40 19.738875648           ~ 43 2
39 2C 553 QSO 06 27 10.1 -05 53 06           ~ 152 1
40 4C 10.20 Rad 06 32 15.30 +10 22 02.0           ~ 34 1
41 NVSS J063243+155957 Rad 06 32 43.13558 +15 59 57.6216           ~ 14 1
42 4C 08.21 Rad 06 33 13.00 +08 13 20.0           ~ 19 1
43 PKS 0704-23 rG 07 06 33.5180238240 -23 11 37.853088900           ~ 31 1
44 PKS 0709-20 Rad 07 11 47.27 -20 43 14.1           ~ 20 1
45 QSO J0730-116 QSO 07 30 19.1119137384 -11 41 12.596691444     20.30 20.3   ~ 279 1
46 PKS 0733-17 Rad 07 35 45.81248037 -17 35 48.5022692           ~ 58 1
47 QSO B0736+01 QSO 07 39 18.0339358560 +01 37 04.618841340   16.90 16.47 16.19   ~ 651 1
48 ICRF J092703.0+390220 Sy1 09 27 03.0138528936 +39 02 20.850343332   17.17 17.00 16.486   ~ 964 1
49 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 662 1
50 4C 01.28 BLL 10 58 29.6054370384 +01 33 58.820502924   18.74 18.28 16.68   ~ 719 2
51 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 179 1
52 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5600 1
53 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2896 2
54 QSO B1334-127 QSO 13 37 39.7829208840 -12 57 24.693846264   18.5 18.5 16.22   ~ 460 1
55 NAME dze Oph Cloud Cld 16 37 09 -10 34.0           ~ 107 0
56 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1638 2
57 LDN 204 DNe 16 47 47.3 -12 05 16           ~ 54 0
58 NVSS J170918-352521 Rad 17 09 18.6685485384 -35 25 22.188961056           ~ 13 1
59 PMN J1714-2836 Rad 17 14 27.70 -28 36 26.3           ~ 3 1
60 ICRF J171736.0-334208 BLL 17 17 36.0293353 -33 42 08.832233   20.93   17.3   ~ 109 1
61 VCS4 J1717-3948 Rad 17 17 38.6013215 -39 48 52.668940           ~ 13 0
62 QSO B1730-130 QSO 17 33 02.7055087032 -13 04 49.545516612   18 18.5 18.78 17.39 ~ 1072 1
63 QSO B1741-038 QSO 17 43 58.8561752304 -03 50 04.618401684     18.5 17.98   ~ 509 1
64 4C 09.57 BLL 17 51 32.8186120872 +09 39 00.728629416   17.46 16.78 15.57   ~ 886 1
65 PMN J1751-2524 Rad 17 51 51.26306 -25 24 00.0607           ~ 76 0
66 PMN J1820-0947 Rad 18 20 38.10 -09 47 17.0           ~ 7 1
67 PMN J1822-1309 Rad 18 22 10.8 -13 09 45           ~ 10 1
68 PMN J1822-0939 Rad 18 22 28.70 -09 38 57.0           ~ 37 1
69 4C 56.27 BLL 18 24 07.0679485560 +56 51 01.479645612   18.9 18.4 16.48   ~ 455 1
70 ICRF J183220.8-103511 G 18 32 20.83647 -10 35 11.1968           ~ 82 1
71 2C 1590 BLL 18 45 37.60 +09 53 44.0           ~ 75 1
72 NVSS J185146+003532 Rad 18 51 46.72295 +00 35 32.3649           ~ 64 1
73 ICRF J190255.9+315941 Sy1 19 02 55.9388845368 +31 59 41.699274720     17.5     ~ 263 2
74 PMN J1908-1855 Rad 19 08 14.80 -18 55 54.2           ~ 3 1
75 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2034 4
76 [VV2006] J191154.1-210244 QSO 19 11 53.9382469416 -21 02 43.797069420     17.00 17.9   ~ 26 1
77 ICRF J191158.2+161146 Bz? 19 11 58.25741154 +16 11 46.8654736           ~ 32 1
78 NVSS J191254+051801 Rad 19 12 54.2461338072 +05 18 00.512103456           ~ 11 1
79 EQ 1915+062 Rad 19 17 48.8 +06 21 16           ~ 5 0
80 ICRF J192559.6+210626 BLL 19 25 59.60535560 +21 06 26.1620442           ~ 188 1
81 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     15.5 15.11   ~ 509 2
82 ICRF J195248.2+252653 BLL 19 52 48.2939810 +25 26 53.484587           ~ 9 0
83 QSO B1954+513 QSO 19 55 42.7384954488 +51 31 48.542394936     18.5 17.34   ~ 227 1
84 QSO B2005+40 QSO 20 07 44.9449261536 +40 29 48.603352020   18.5 19 20.3   ~ 283 1
85 4C 24.48 Rad 20 09 25.06 +25 05 47.4           ~ 11 1
86 QSO J2015+371 BLL 20 15 28.7286181152 +37 10 59.514330396     21.82 21.4   ~ 266 2
87 4C 31.56 QSO 20 23 19.0172320680 +31 53 02.305685400           ~ 105 1
88 ICRF J202355.8+542735 QSO 20 23 55.8429662232 +54 27 35.857362528           ~ 34 1
89 QSO B2023+336 BLL 20 25 10.8420829392 +33 43 00.214964976       0   ~ 149 1
90 4C 54.42 QSO 20 31 47.9586852408 +54 55 03.138662316   18.7       ~ 41 1
91 3C 418.0 QSO 20 38 37.0347144096 +51 19 12.660083976   21.30 20.00 18.9   ~ 287 0
92 5C 8.146 QSO 20 50 51.13147204 +31 27 27.3740758     19.7 15.9   ~ 82 1
93 4C 50.53 Rad 20 57 20.11 +50 58 15.8           ~ 7 1
94 HVABG 27 Rad 21 08 56.47 +49 41 56.1           ~ 2 0
95 4C 62.33 Rad 21 12 48.80 +62 15 00.0           ~ 24 1
96 4C 06.69 QSO 21 48 05.4586454304 +06 57 38.602799388   16.85 16.47 15.06   ~ 631 1
97 4C 60.32 Rad 21 48 16.0423060 +61 07 05.794059           ~ 26 1
98 3C 439 Rad 21 56 37.80 +48 30 28.0           ~ 9 1
99 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2141 1
100 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2697 2
101 4C 70.24 BLL 22 57 05.60 +70 28 39.6           ~ 8 1
102 4C 53.53 Rad 23 43 48.43 +53 48 39.9           ~ 9 1
103 3C 468.1 G 23 50 54.80 +64 40 19.0           ~ 67 1

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2022.09.27-02:58:32

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