2009ApJ...691.1494G

Query : 2009ApJ...691.1494G

2009ApJ...691.1494G - Astrophys. J., 691, 1494-1500 (2009/February-1)

A survey of C4H, C6H, and C6H– with the Green Bank Telescope.

GUPTA H., GOTTLIEB C.A., McCARTHY M.C. and THADDEUS P.

Abstract (from CDS):

A survey of the carbon chain negative ion C6H– and the structurally similar radicals C4 H and C6H has been done with the 100 m Green Bank Telescope toward 24 galactic molecular sources. The most readily observed molecular anion to date, C6H– was detected in two new sources: the dark clouds L1544 and L1521F, where it was found to be present at the level of 2.5%±0.8% and 4%±1%, respectively relative to neutral C6H. C4 H was detected in nearly all dark clouds surveyed (in six for the first time), and C6 H was detected in five dark clouds and one translucent cloud. The observed C6H–/C6 H (1%-4%) and C6H/C4H (0.2%-1%) ratios in these sources suggest that C6H– may be close to detection in many other dark clouds. The fractional ionization derived from the C6H–/C6 H ratio in L1544 and L1521F of 10–8 to 10–7 is comparable to earlier estimates from positive molecular ions.

Abstract Copyright: ∼

Journal keyword(s): ISM: molecules - molecular data - molecular processes - radio lines: ISM

Simbad objects: 33

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Number of rows : 33
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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1032 3
2 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
3 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 324 0
4 LDN 1389 MoC 04 04 38 +56 56.2           ~ 92 0
5 LDN 1495B DNe 04 15 36.5 +28 46 06           ~ 48 0
6 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 951 1
7 IRAS 04191+1523 Y*O 04 22 00.43944 +15 30 21.2148           ~ 199 0
8 NAME [BM89] L1521B cor 04 24 12.7 +26 36 53           ~ 72 0
9 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 210 1
10 NAME [BM89] L1521E DNe 04 29 21.0 +26 14 19           ~ 105 1
11 Bad 16 Y*O 04 30 50.2774891944 +23 00 08.757461592       14.95   F1 140 0
12 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 805 1
13 LDN 1527 DNe 04 39 53 +25 45.0           ~ 635 0
14 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
15 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1676 0
16 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1001 0
17 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 175 0
18 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 863 0
19 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 437 1
20 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 511 0
21 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2343 0
22 V* RW LMi C* 10 16 02.2777043904 +30 34 19.045098516       15.27   C4,3e 396 0
23 WOS 48 C* 15 23 05.0730770544 -51 25 58.762691652   17.85 16.66 14.51 10.18 C 134 1
24 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 759 1
25 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 673 1
26 LDN 492 DNe 18 15 51 -03 44.4           ~ 48 0
27 NAME Aql Rift DNe 18 32 -01.0           ~ 316 1
28 W 51m Rad 19 23.7 +14 30           ~ 61 0
29 W 51 SNR 19 23 50 +14 06.0           ~ 1278 1
30 LDN 1082A DNe 20 53 29.6 +60 14 40           ~ 42 1
31 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 873 1
32 LDN 1251 DNe 22 36.1 +75 16           ~ 111 0
33 RAFGL 3068 C* 23 19 12.60744 +17 11 33.1332           C 270 0

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