2004A&A...414..235S


Query : 2004A&A...414..235S

2004A&A...414..235S - Astronomy and Astrophysics, volume 414, 235-243 (2004/1-4)

Observations of hydroxyl ground state transitions in a complete sample of methanol sources.

SZYMCZAK M. and GERARD E.

Abstract (from CDS):

High sensitivity observations of all four transitions of the ground state 2Π3/2, J=3/2 of OH in both senses of circular polarization have been carried out with the Nancay radio telescope. The sample was a set of 100 star forming regions detected in a recent unbiased survey of 6668MHz CH3OH masers. OH maser emission was found in 55 objects of which 31 were not previously catalogued. The 1665MHz line was seen in almost all OH maser sources and was accompanied by the 1667MHz line in about 75% of cases. Respectively 7% and 11% of OH 1665MHz masers were accompanied by maser lines at 1612 and 1720MHz. These two satellite line masers never occurred simultaneously in the same source nor at the same radial velocity, suggesting mutually exclusive physical conditions as predicted by models. OH maser emission usually shared the same velocity range as the 6668MHz CH3OH maser. The intensity ratio of the 6668MHz and 1665MHz lines clearly divides the sample into methanol- and hydroxyl-rich sources and could be controlled by the abundance of maser molecules and the kinetic temperature. The OH maser emission was substantially polarized with a mean fractional circular polarization of 0.30 and Zeeman pair candidates were found in 15 targets. 36 sources were found in OH absorption at the main lines and 24 of them were also accompanied by OH maser emission. OH absorption features were blueshifted with regard to the related OH masers, indicating that they were formed in front of the central continuum sources. Absorption at 1720MHz was always accompanied by emission at 1612MHz and vice versa. The behaviour of stimulated emission and absorption in both satellite lines was thus conjugated and the 1720MHz emission features seem to be signatures of regions of low hydrogen density and OH column density. The correlation of OH and CH3OH flux densities with the IRAS flux densities found for our sample appears to support pumping schemes of both molecules by infrared photons. Statistics of masers in the sample appear to be consistent with the scenario that the CH3OH masers appeared earlier than the OH masers.

Abstract Copyright:

Journal keyword(s): masers - surveys - stars: formation - ISM: molecules - radio lines: ISM - HII regions

VizieR on-line data: <Available at CDS (J/A+A/414/235): table1.dat table2.dat table3.dat table4.dat>

Simbad objects: 98

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Number of rows : 98
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 [M91] B182455.8-111624 Mas 18 27 44.1 -11 14 54           ~ 12 0
2 OH 020.1-00.1 SFR 18 28 10.37 -11 28 49.8           ~ 111 0
3 [SHK2000] 18278-0936 Mas 18 30 35.7 -09 34 26           ~ 5 0
4 [SHK2000] 18278-1009 Mas 18 30 36.5 -10 06 44           ~ 5 0
5 [M91] B182816.1-095101 Mas 18 31 02 -09 49.1           ~ 7 0
6 [SHK2000] 18282-1024 Mas 18 31 06.3 -10 21 37           ~ 5 0
7 [SHK2000] 18290-0924 Mas 18 31 45.6 -09 22 44           ~ 5 0
8 Caswell CH3OH 022.34-00.16 Mas 18 32 32.1 -09 29 10           ~ 4 0
9 [SKH2002] 22.45-0.17 Mas 18 32 45.8 -09 24 06           ~ 3 0
10 [SHK2000] 18305-0826 Mas 18 33 13.1 -08 23 56           ~ 5 0
11 [SVG93] 183108.2-082540 Mas 18 33 47.4 -08 21 37           ~ 5 0
12 [SVG93] 183146.3-084539 Mas 18 34 30.8 -08 42 42           ~ 5 0
13 [M91] B183155.8-083417 Mas 18 34 39.0 -08 31 36           ~ 11 0
14 Caswell CH3OH 023.01-00.41 Mas 18 34 39.9 -09 00 44           ~ 17 0
15 IRAS 18321-0820 Y*O 18 34 51.5650 -08 18 21.305           ~ 45 0
16 [SHK2000] 18322-0721 Mas 18 34 53.0 -07 19 11           ~ 5 0
17 [SHK2000] 18321-0854 Mas 18 34 54.5 -08 50 04           ~ 7 0
18 [M91] B183232.3-073824 Mas 18 35 09.4 -07 34 58           ~ 11 0
19 OH 024.148-00.009 Mas 18 35 20.974 -07 48 55.32           ~ 7 0
20 [SHK2000] 18326-0802 Mas 18 35 22.9 -08 01 11           ~ 5 0
21 [SKH2002] 24.51-0.05 Mas 18 36 08.7 -07 30 55           ~ 3 0
22 Caswell CH3OH 024.79+00.08 Mas 18 36 12.1 -07 12 13           ~ 8 0
23 Caswell CH3OH 024.85+00.09 Mas 18 36 17.2 -07 09 01           ~ 5 0
24 [SKH2002] 24.93+0.08 Mas 18 36 29.2 -07 05 05           ~ 4 0
25 [VGM95] 183436.9-064115 Mas 18 37 18.3 -06 38 38           ~ 7 0
26 [SKH2002] 24.64-0.33 Mas 18 37 25.2 -07 31 53           ~ 4 0
27 OH 025.709+00.044 Mas 18 38 03.1450 -06 24 15.190           ~ 16 0
28 [SVG93] 183626.4-062714 Mas 18 39 04.7 -06 24 17           ~ 10 0
29 [SHK2000] 18372-0537 Mas 18 39 51.8 -05 34 52           ~ 5 0
30 [SHK2000] 18372-0541 Mas 18 39 52.8 -05 38 48           ~ 5 0
31 [SKH2002] 27.21+0.26 Mas 18 40 03.8 -04 58 09           ~ 4 0
32 AGAL G027.221+00.137 Y*O 18 40 31 -05 01.1           ~ 22 0
33 [GVS2000] 18379-0500 Mas 18 40 33.9 -04 57 18           ~ 6 0
34 [VGM95] 183758.2-054628 Mas 18 40 38.6 -05 43 37           ~ 5 0
35 [SHK2000] 18392-0436 Mas 18 41 47.5 -04 33 11           ~ 5 0
36 Caswell CH3OH 027.36-00.16 Mas 18 41 50.6 -05 01 47           ~ 14 0
37 [SKH2002] 28.85+0.50 Mas 18 42 12.8 -03 24 26           ~ 5 0
38 [SKH2002] 28.69+0.41 Mas 18 42 13.6 -03 35 07           ~ 4 0
39 [SKH2002] 28.82+0.37 Mas 18 42 35.2 -03 29 26           ~ 5 0
40 Caswell CH3OH 028.15+00.00 Mas 18 42 40.9 -04 15 26           ~ 11 0
41 [SHK2000] 18402-0403 Mas 18 42 54.5 -04 00 04           ~ 5 0
42 [SKH2002] 28.53+0.12 Mas 18 42 57.7 -03 51 59           ~ 4 0
43 [SKH2002] 28.19-0.05 Mas 18 42 57.8 -04 14 21           ~ 3 0
44 [SKH2002] 28.02-0.44 Mas 18 44 02.1 -04 34 14           ~ 5 0
45 [SVG93] 184145.8-042052 Mas 18 44 24.5 -04 17 45           ~ 6 0
46 Caswell CH3OH 028.84-00.23 Mas 18 44 47.6 -03 44 49           ~ 4 0
47 [M91] B184212.4-034908 Mas 18 44 50.0 -03 45 23           ~ 3 0
48 [SKH2002] 29.31-0.15 Mas 18 45 23.1 -03 17 23           ~ 4 0
49 AGAL G029.862-00.044 Mas 18 45 59.437 -02 45 05.78           ~ 29 0
50 [M91] B184327.1-024236 Mas 18 46 03.6 -02 39 24           ~ 14 1
51 [SKH2002] 29.97-0.04 Mas 18 46 11.4 -02 39 14           ~ 4 0
52 [SHK2000] 18438-0222 Mas 18 46 23.7 -02 17 56           ~ 6 0
53 [M91] B184400.5-014829 Mas 18 46 36.4 -01 45 24           ~ 4 0
54 AGAL G030.779+00.231 Mas 18 46 42 -01 48.6           ~ 22 0
55 [SHK2000] 18441-0134 Mas 18 46 46.2 -01 31 06           ~ 4 0
56 Caswell CH3OH 030.79+00.20 Mas 18 46 48.2 -01 48 46           ~ 8 0
57 Caswell CH3OH 030.20-00.17 Mas 18 47 02.5 -02 30 38           ~ 9 0
58 [SKH2002] 30.89+0.17 Mas 18 47 07.3 -01 44 15           ~ 2 0
59 [SKH2002] 30.22-0.19 Mas 18 47 09.8 -02 29 38           ~ 3 0
60 IRAS 18446-0209 Y*O 18 47 18.91 -02 06 17.0           ~ 25 0
61 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 387 0
62 AGAL G030.703-00.067 cor 18 47 36.6 -02 00 54           ~ 66 0
63 [SKH2002] 30.59-0.13 Mas 18 47 37.2 -02 08 46           ~ 3 0
64 GAL 030.76-00.05 HII 18 47 38.9 -01 57 25           ~ 22 0
65 [SHK2000] 18452-0141 Mas 18 47 45.6 -01 37 19           ~ 4 0
66 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 164 0
67 [SKH2002] 30.40-0.29 Mas 18 47 51.2 -02 23 15           ~ 4 0
68 [SHK2000] 18454-0136 Mas 18 48 00.3 -01 34 01           ~ 4 0
69 [M91] B184536.8-012912 Mas 18 48 10.9 -01 26 44           ~ 2 0
70 [SKH2002] 30.96-0.14 Mas 18 48 19.7 -01 48 59           ~ 2 0
71 [SHK2000] 18461-0113 Mas 18 48 44.3 -01 11 18           ~ 6 0
72 [PMB2005] CH3OH 032.03+00.06 Mas 18 49 37.300 -00 45 47.00           ~ 6 0
73 Caswell CH3OH 032.74-00.08 Mas 18 51 21.8 -00 12 13           ~ 13 0
74 [VGM95] 184854.1+000036 Mas 18 51 27.8 +00 04 14           ~ 5 0
75 [SKH2002] 33.10-0.06 Mas 18 51 58.9 +00 07 27           ~ 3 0
76 OH 033.1-00.1 Mas 18 52 07.3 +00 08 06           ~ 21 0
77 [SHK2000] 18497+0022 Mas 18 52 10.6 +00 25 09           ~ 4 0
78 [SKH2002] 33.86+0.01 Mas 18 53 05.2 +00 49 36           ~ 3 0
79 [SKH2002] 34.25+0.16 Mas 18 53 16.7 +01 14 49           ~ 2 0
80 JCMTSF J185321.7+011338 Mas 18 53 21.4 +01 13 43           ~ 7 0
81 [SKH2002] 34.40+0.21 Mas 18 53 21.5 +01 24 09           ~ 2 0
82 [SHK2000] 18508+0052 Mas 18 53 24.1 +00 55 13           ~ 4 0
83 [SKH2002] 33.74-0.15 Mas 18 53 26.9 +00 39 01           ~ 3 0
84 [BK2004] J185328.7+003158 Mas 18 53 28.7 +00 31 58           ~ 15 0
85 [SKH2002] 34.10+0.01 Mas 18 53 31.9 +01 02 26           ~ 3 0
86 Caswell CH3OH 035.02+00.35 Mas 18 54 00.6 +02 00 50           ~ 5 0
87 [SKH2002] 34.74-0.09 Mas 18 55 03.4 +01 34 17           ~ 3 0
88 [SHK2000] 18527+0301 Mas 18 55 15.6 +03 04 42           ~ 7 0
89 [SKH2002] 35.79-0.17 Mas 18 57 16.1 +02 27 44           ~ 3 0
90 [SKH2002] 36.70+0.09 Mas 18 58 00.9 +03 23 30           ~ 5 0
91 [SKH2002] 37.60+0.42 Mas 18 58 28.5 +04 20 34           ~ 4 0
92 [SKH2002] 37.02-0.03 Mas 18 58 59.9 +03 37 40           ~ 4 0
93 [SHK2000] 18566+0408 Mas 18 59 11.6 +04 12 08           ~ 5 0
94 [SKH2002] 37.47-0.11 Mas 19 00 06.7 +03 59 27           ~ 4 0
95 [SHK2000] 18577+0358 Mas 19 00 14.4 +04 02 35           ~ 5 0
96 [SKH2002] 38.20-0.08 Mas 19 01 22.8 +04 39 10           ~ 4 0
97 [SHK2000] 18592+0426 Mas 19 01 47.6 +04 30 32           ~ 5 0
98 [SKH2002] 38.03-0.30 Mas 19 01 50.0 +04 23 54           ~ 4 0

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