2002ApJ...577..221R


Query : 2002ApJ...577..221R

2002ApJ...577..221R - Astrophys. J., 577, 221-244 (2002/September-3)

A far ultraviolet spectroscopic explorer survey of interstellar molecular hydrogen in translucent clouds.

RACHFORD B.L., SNOW T.P., TUMLINSON J., SHULL J.M., BLAIR W.P., FERLET R., FRIEDMAN S.D., GRY C., JENKINS E.B., MORTON D.C., SAVAGE B.D., SONNENTRUCKER P., VIDAL-MADJAR A., WELTY D.E. and YORK D.G.

Abstract (from CDS):

We report the first ensemble results from the Far Ultraviolet Spectroscopic Explorer survey of molecular hydrogen in lines of sight with AV≳1 mag. We have developed techniques for fitting computed profiles to the low-J lines of H2, and thus determining column densities for J=0 and J=1, which contain ≳99% of the total H2. From these column densities and ancillary data we have derived the total H2column densities, hydrogen molecular fractions, and kinetic temperatures for 23 lines of sight. This is the first significant sample of molecular hydrogen column densities of ∼1021 cm–2, measured through UV absorption bands. We have also compiled a set of extinction data for these lines of sight, which sample a wide range of environments. We have searched for correlations of our H2-related quantities with previously published column densities of other molecules and extinction parameters. We find strong correlations between H2and molecules such as CH, CN, and CO, in general agreement with predictions of chemical models. We also find the expected correlations between hydrogen molecular fraction and various density indicators such as kinetic temperature, CN abundance, the steepness of the far-UV extinction rise, and the width of the 2175 Å bump. Despite the relatively large molecular fractions, we do not see the values greater than 0.8 expected in translucent clouds. With the exception of a few lines of sight, we see little evidence for the presence of individual translucent clouds in our sample. We conclude that most of the lines of sight are actually composed of two or more diffuse clouds similar to those found toward targets like ζ Oph. We suggest a modification in terminology to distinguish between a ``translucent line of sight'' and a ``translucent cloud.''

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Clouds - ISM: Lines and Bands - ISM: Molecules - Ultraviolet: ISM

Simbad objects: 51

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Number of rows : 51
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10322 1
2 Ass Per OB 2 As* 03 42.2 +33 26           ~ 322 0
3 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 589 0
4 IC 348 OpC 03 44 32 +32 09.5           ~ 1315 1
5 HD 281159 Y*O 03 44 34.1873929 +32 09 46.137563 9.19 9.21 8.53 8.85 7.850 B5V 213 0
6 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 940 0
7 * 62 Tau * 04 23 59.7627483096 +24 18 03.527065188 6.18 6.499 6.337     B3V 207 0
8 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1297 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16168 1
10 HD 37903 Em* 05 41 38.3891026008 -02 15 32.479650720 7.32 7.94 7.83 7.64 7.52 B3IV 340 1
11 HD 62542 * 07 42 37.2147724128 -42 13 47.831717064   8.21 8.03     B3V 138 0
12 NAME GUM Nebula ISM 07 43 -42.1           ~ 406 1
13 HD 73882 EB* 08 39 09.53412 -40 25 09.2608 7.07 7.59 7.19 6.67 6.30 O8.5IV 229 2
14 Ass Vel OB 1 As* 08 49.9 -45 00           ~ 97 0
15 HD 80077 s*b 09 15 54.7869062472 -49 58 24.575734452 10.50 10.29 9.00 7.89   B2Ia+e 134 0
16 HD 96675 Y*O 11 05 57.8105960448 -76 07 48.884316960   7.82 7.68   8.48 B5V 73 0
17 HD 102065 Y*O 11 43 36.9451657872 -80 29 00.511110852   6.67 6.61     B9IV 61 0
18 HD 108927 * 12 32 19.7295790536 -78 11 38.855722632   7.83 7.76     B5V 34 0
19 HD 110432 Be* 12 42 50.2663572384 -63 03 31.052981412 4.79 5.58 5.31     B0.5IVpe 284 0
20 HD 147889 Y*O 16 25 24.3163637976 -24 27 56.569805208 8.56 8.73 7.90     B2V 457 1
21 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 280 1
22 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1785 2
23 HD 154368 s*b 17 06 28.3687759224 -35 27 03.760593156 6.10 6.63 6.13 7.12   O9.5Iab 277 0
24 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 56 1
25 Ass Ser OB 2 As* 18 18 -12.3           ~ 61 0
26 NGC 6604 OpC 18 18 03 -12 14.5           ~ 129 0
27 HD 167971 s*b 18 18 05.8947362832 -12 14 33.313601112 7.89 8.27 7.50 6.68 6.279 O8Iaf(n)+O4/5 285 0
28 HD 168076 ** 18 18 36.4205083536 -13 48 02.420915796 8.12 8.72 8.25 7.62 7.21 O4III(f) 188 0
29 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 989 2
30 HD 170740 SB* 18 31 25.6939245072 -10 47 45.008376432 5.51 5.96 5.72     B2V+ 182 1
31 HD 185418 * 19 38 27.4809937872 +17 15 26.048161044 7 7.639 7.485     B0.5V 127 0
32 Ass Cyg OB 3 As* 20 07 +35.9           ~ 177 0
33 HD 192163 WR* 20 12 06.5418877464 +38 21 17.784181008 7.12 7.49 7.50     WN6(h)-s 533 0
34 HD 192639 s*b 20 14 30.4275801672 +37 21 13.816276704 6.83 7.46 7.11     O7.5Iabf 279 0
35 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 259 1
36 M 29 OpC 20 23 46 +38 29.2   7.30 6.6     ~ 231 0
37 HD 197512 * 20 42 10.0488399504 +49 44 05.060333040 7.93 8.60 8.55     B1V 63 0
38 HD 199579 SB* 20 56 34.7779063080 +44 55 29.000891928 5.16 6.01 5.96     O6.5V((f))z 354 0
39 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 383 0
40 Ass Cyg OB 7 As* 21 08 +47.6           ~ 205 0
41 HD 203938 ** 21 23 50.1690416971 +47 09 52.446883103 7.13 7.54 7.08     B0.5IV 94 0
42 HD 206267B * 21 38 57.4687234833 +57 29 21.835223367     13.30     O9:V 10 0
43 HD 206267 SB* 21 38 57.6195772032 +57 29 20.554016280 5.09 5.83 5.62   5.56 O6.0V((f))+O9:V 479 0
44 IC 1396 OpC 21 38 59 +57 30.8           ~ 462 1
45 NAME Cepheus Bubble PoC 21 44 +61.7           ~ 33 0
46 HD 207198 * 21 44 53.2791389640 +62 27 38.048647248 5.61 6.25 5.94 5.66 5.49 O8.5II 332 0
47 HD 207538 * 21 47 39.7896725544 +59 42 01.348647696 7 7.55 7.30     O9.7IV 185 1
48 Ass Cep OB 2 As* 21 51 +60.0           ~ 283 0
49 HD 210121 * 22 08 11.9027578440 -03 31 52.765490316   7.84 7.68     B7II 161 0
50 IREC 80 Cld 22 08.2 -01 37           ~ 10 0
51 * lam Cep s*b 22 11 30.5765111040 +59 24 52.154264880 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 666 1

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2022.08.18-03:16:29

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