2003ApJ...586..230R

Query : 2003ApJ...586..230R

2003ApJ...586..230R - Astrophys. J., 586, 230-248 (2003/March-3)

A Far Ultraviolet Spectroscopic Explorer survey of molecular hydrogen in intermediate-velocity clouds in the Milky Way halo.

RICHTER P., WAKKER B.P., SAVAGE B.D. and SEMBACH K.R.

Abstract (from CDS):

Far Ultraviolet Spectroscopic Explorer (FUSE) data are used to investigate the molecular hydrogen (H2) content of intermediate-velocity clouds (IVCs) in the lower halo of the Milky Way. We analyze interstellar absorption toward 56 (mostly extragalactic) background sources to study H2 absorption in the Lyman and Werner bands in 61 IVC components at H I column densities ≥1019 cm–2. For data with good signal-to-noise ratio (S/N) (∼9 per resolution element and higher), H2in IVC gas is convincingly detected in 14 cases at column densities varying between ∼1014 and ∼1017 cm–2. We find an additional 17 possible H2detections in IVCs in FUSE spectra with lower S/N. The molecular hydrogen fractions, f, vary between 10–6 and 10–3, implying a dense, mostly neutral gas phase that is probably related to the cold neutral medium (CNM) in these clouds. If the H2stays in formation-dissociation equilibrium, the CNM in these clouds can be characterized by compact (D∼0.1 pc) filaments with volume densities on the order of nH∼30 cm–3. The relatively high detection rate of H2in IVC gas implies that the CNM in these clouds is ubiquitous. More dense regions with much higher molecular fractions may exist, but it would be difficult to detect them in absorption because of their small size.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - ISM: Abundances - ISM: Clouds - Galaxies: Quasars: Absorption Lines - Ultraviolet: ISM

Simbad objects: 81

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Number of rows : 81
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 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1254 0
2 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11152 1
4 LEDA 3237 Sy1 00 54 52.1183662680 +25 25 38.983241532     15.42     ~ 386 0
5 Mrk 352 Sy1 00 59 53.2855168104 +31 49 37.254192204   15.25 14.81     ~ 224 0
6 Mrk 357 SyG 01 22 40.5874370808 +23 10 14.691256572   15.76 15.40     ~ 92 0
7 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1667 2
8 QSO B0238-1904 QSO 02 40 32.5841506272 -18 51 51.370183440     15.00     ~ 61 0
9 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4603 2
10 Mrk 618 Sy1 04 36 22.2985487328 -10 22 33.986941536   15.08 14.51 10.7   ~ 256 0
11 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 662 1
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17438 0
13 LH 58 As* 05 26 45 -68 49.9   7.97 7.96     ~ 58 0
14 2MASS J05594739-5026519 Sy1 05 59 47.3916612936 -50 26 52.025952120   15.18 14.97     ~ 289 1
15 QSO B0624+6907 QSO 06 30 02.5051022520 +69 05 03.913837440   14.64 14.16     ~ 95 0
16 Mrk 9 Sy1 07 36 57.0265753824 +58 46 13.432215792   14.77 14.37     ~ 245 0
17 2MASS J08105865+7602424 Sy1 08 10 58.6641543864 +76 02 42.450451260   15.03 14.71     ~ 469 0
18 PG 0832+676 HS* 08 37 34.7329769280 +67 24 13.597330788   13.87 14.12 14.47   sdOA 53 1
19 Mrk 106 Sy2 09 19 55.3494938448 +55 21 37.128065832   16.34 16.15     ~ 126 0
20 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1106 1
21 LEDA 2149945 Sy1 09 50 48.3803143440 +39 26 50.467298496   16.83 16.73     ~ 198 0
22 PG 0953+414 Sy1 09 56 52.3931554992 +41 15 22.211247636 14.710 15.611 15.546 15.294 14.720 ~ 452 0
23 Ton 28 Sy1 10 04 02.6102134920 +28 55 35.329310688   16.17 15.7     ~ 174 0
24 Ton 1187 Sy1 10 13 03.1814662440 +35 51 23.742391536   15.60 15.42     ~ 89 0
25 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 773 1
26 HD 93521 * 10 48 23.5113981120 +37 34 13.083332412 5.67 6.79 7.03     O9.5IIInn 427 1
27 NGC 3504 LIN 11 03 11.3 +27 58 21   13.48 12.93     ~ 524 2
28 [OKM2018] SWIFT J1104.8+7689 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 543 1
29 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2675 1
30 Mrk 36 SBG 11 04 58.298 +29 08 16.54   15.5 15.29     ~ 225 0
31 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1545 0
32 Ton 1388 Sy1 11 19 08.6786220240 +21 19 17.987085948   14.91 14.80     ~ 466 0
33 IC 2746 Sy2 11 21 47.1179115936 +11 44 18.909849876   15.38 14.93     ~ 218 0
34 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
35 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 629 4
36 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
37 HD 100340 HS? 11 32 49.9414410936 +05 16 36.231905676 8.906 9.881 10.115 10.219 10.353 B0 100 0
38 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1648 0
39 NGC 3991 EmG 11 57 30.465 +32 20 03.00   13.8       ~ 156 1
40 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3693 2
41 PB 3894 Sy1 12 14 17.6738687784 +14 03 13.182723144   14.46 14.19     ~ 822 0
42 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 965 1
43 Mrk 205 Sy1 12 21 44.0724099888 +75 18 38.241006228   15.64 15.24 14.7   ~ 477 0
44 Mrk 209 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 346 0
45 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5803 1
46 2MASS J12305003+0115226 Sy1 12 30 50.0331165552 +01 15 22.598028288   14.44 14.42     ~ 98 0
47 Mrk 771 Sy1 12 32 03.6223710000 +20 09 29.495834136   15.57 15.30     ~ 495 0
48 EC 12476-2317 AGN 12 50 18.90 -23 33 57.6   16.29 15.46     ~ 67 0
49 Mrk 59 AGN 12 59 00.288 +34 50 42.45           ~ 317 2
50 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 383 2
51 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 281 0
52 NAME vZ 1128 pA* 13 42 16.7509672392 +28 26 00.616904988   14.77 15.04 15.50   O8p 78 0
53 Mrk 279 Sy1 13 53 03.4348964112 +69 18 29.410910460   15.15 14.46     ~ 761 0
54 2XMM J135315.8+634546 Sy1 13 53 15.8311116864 +63 45 45.683126676   14.54 14.28     ~ 385 0
55 HD 121800 * 13 55 15.4510231656 +66 07 00.645739068 8.19 8.92 9.01     B5V 59 0
56 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 185 0
57 Mrk 817 Sy1 14 36 22.0820611632 +58 47 39.394934844   14.19 13.79     ~ 523 0
58 2MASS J14464593+4035057 Sy1 14 46 45.9392259288 +40 35 05.797233636   16.28 16.11     ~ 293 0
59 Mrk 487 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 132 0
60 Mrk 876 Sy1 16 13 57.1795021224 +65 43 09.952685328   16.03 15.49     ~ 583 0
61 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 260 1
62 NAME Draco Cloud MoC 16 48 17 +60 11.8           ~ 72 1
63 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2162 2
64 ESO 141-55 Sy1 19 21 14.1473895816 -58 40 12.982437480   14.36 13.64 13.28   ~ 364 0
65 [W2001c] Complex gp PoC 20 01 +01.0           ~ 8 0
66 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1276 0
67 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3140 0
68 Mrk 1513 Sy1 21 32 27.8162556672 +10 08 19.252365396   14.92 14.64     ~ 611 0
69 NGC 7673 EmG 23 27 41.060 +23 35 20.18 12.84 13.17 12.76     ~ 275 1
70 NGC 7714 GiP 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 765 1
71 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 607 0
72 NAME IV Spur PoC ~ ~           ~ 24 0
73 [KD96] IV19 Cld ~ ~           ~ 7 0
74 NAME PP Arch PoC ~ ~           ~ 10 0
75 NAME IV Arch PoC ~ ~           ~ 62 1
76 [KD96] IV26 Cld ~ ~           ~ 6 0
77 NAME LLIV Arch PoC ~ ~           ~ 24 0
78 [KD96] IV18 Cld ~ ~           ~ 5 0
79 [KD96] IV16 Cld ~ ~           ~ 3 0
80 [KD96] IV9 Cld ~ ~           ~ 4 0
81 [KD96] IV4 Cld ~ ~           ~ 4 0

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