2006A&A...458..485F

Query : 2006A&A...458..485F

2006A&A...458..485F - Astronomy and Astrophysics, volume 458485-495 (2006/11-1)

Enhanced density and magnetic fields in interstellar OH masers.

FISH V.L., REID M.J., MENTEN K.M. and PILLAI T.

Abstract (from CDS):

We have observed the 6030 and 6035 MHz transitions of OH in high-mass star-forming regions to obtain magnetic field estimates in both maser emission and absorption. Observations were taken with the Effelsberg 100m telescope. Our observations are consistent with previous results, although we do detect a new 6030MHz maser feature near -70km/s in the vicinity of W3(OH). In absorption we obtain a possible estimate of -1.1 ±0.3mG for the average line-of-sight component of the magnetic field in the absorbing OH gas in K3-50 and submilligauss upper limits for the line-of-sight field strength in DR 21 and W3. These results indicate that the magnetic field strength in the vicinity of OH masers is higher than that of the surrounding, non-masing material, which in turn suggests that the density of masing OH regions is higher than that of their surroundings.

Abstract Copyright: ∼

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

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GAL 133.71+01.22 HII 02 25 38.1 +62 05 52           ~ 78 0
2 [ARM2000] G133.715+01.215 Mas 02 25 40.59 +62 05 50.5           ~ 2 0
3 IC 1795 HII 02 25 43.5 +62 06 13           ~ 247 0
4 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
5 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
6 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
7 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
8 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 943 1
9 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2455 0
10 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
11 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 955 0
12 OH 000.666-00.029 Mas 17 47 18.64 -28 22 54.6           ~ 3 0
13 OH 000.66-00.03 Mas 17 47 20.12 -28 23 06.2           ~ 65 1
14 OH 005.90-00.38 Mas 18 00 30.373 -24 04 00.96           ~ 51 1
15 OH 010.62-00.38 Mas 18 10 28.65 -19 55 49.5           ~ 28 0
16 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
17 OH 019.61-00.23 Mas 18 27 37.8 -11 56 27           ~ 24 0
18 OH 028.201-00.049 Mas 18 42 58.197 -04 13 59.41           ~ 8 0
19 IRAS 18446-0209 Y*O 18 47 18.91 -02 06 17.0           ~ 26 0
20 OH 035.58-00.03 Mas 18 56 22.50 +02 20 27.1           ~ 21 0
21 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 158 0
22 OH 045.122+00.133 Mas 19 13 27.942 +10 53 34.84           ~ 8 0
23 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
24 NAME W 51 IRS 1 HII 19 23 41.9 +14 30 36           ~ 124 0
25 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 85 0
26 [KCW94] 069.540-00.975 HII 20 10 08.95 +31 31 35.4           ~ 168 1
27 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 172 0
28 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
29 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 131 1
30 18P 73 Rad 20 36 55.9 +41 36 29           ~ 50 0
31 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
32 [H73b] A Rad 20 39 00.59 +42 19 36.0           ~ 9 0
33 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 91 0
34 [H73b] B Rad 20 39 01.13 +42 19 41.0           ~ 8 0
35 [H73b] C Rad 20 39 01.30 +42 19 31.7           ~ 10 0
36 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
37 2MASS J21430143+5456183 Y*O 21 43 01.4400 +54 56 17.800           ~ 64 2
38 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 668 2
39 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 600 0
40 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
41 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
42 [WBN74] NGC 7538 IRS 11 Y*O 23 13 43.901 +61 26 57.98           ~ 56 0
43 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3

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