2002A&A...394..107B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.17CEST08:37:03

2002A&A...394..107B - Astronomy and Astrophysics, volume 394, 107-113 (2002/10-4)

Discovery of new highly excited OH sources in regions of high-mass star formation.

BAUDRY A. and DESMURS J.F.

Abstract (from CDS):

We have carried out sensitive observations of the highly excited 2 Π3/2, J7/2 state of OH (290K above the ground-level) at 13441MHz (F=4-4) and 13435MHz (F=3-3) in both right and left circular polarizations with the Effelsberg 100-m telescope. Our sample included 27 compact or ultra-compact HII regions. Most of them have been selected from our previous J5/2 OH maser survey of star-forming regions taken from the IRAS point-source catalog. We have observed weak 2 Π3/2, J7/2, F=4-4 and 3-3 absorption in 7 sources and discovered 3 new weak F=4-4 maser sources at 13441MHz in addition to W3(OH). The new sources, 20081+3122 (ON1), 21413+5442 and G11.90-0.14, are 50 to 100 times or more weaker than the 13441MHz peak flux density observed in W3(OH). 21413+5442 and G11.90-0.14 exhibit extremely narrow velocity extents of the order of 0.4km/s. However, in ON1 there are two groups of narrow velocity features separated by about 14km/s; these two groups are also observed in lower rotational levels and suggest complex kinematics in the envelope of the young ultra-compact HII region. Apart from a very weak, polarized, and narrow J7/2, F=3-3 emission feature lying on the red wing of the 13435MHz absorption feature in W3(OH) no J7/2, F=3-3 emission was discovered. We conclude that the 13441MHz OH maser emission from W3(OH) remains exceptionally strong but not unique. In contrast with the J5/2, 6035MHz maser emission observed in a large number of star-forming regions, J7/2, 13441MHz emission is not widespread. This is expected from OH maser theory, and because the involved J7/2 levels are high in the OH energy ladder and not directly connected to the ground-state.

Abstract Copyright:

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

CDS comments: G 309.9+0.48 = GAL 309.9+00.5. In table 1, G 11.80-0.14 = GPSR5 11.903-0.141, G 0.66-0.03 = [WBH98] 17441-2822.

Simbad objects: 40

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Number of rows : 40

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 956 2
2 GAL 309.9+00.5 HII 13 50.7 -61 35           ~ 3 0
3 Caswell OH 000.66-00.03 Mas 17 47 19.0 -28 22 52           ~ 3 0
4 IRAS 17441-2822 HII 17 47 20.224 -28 23 04.13           ~ 24 0
5 GPSR5 11.903-0.141 Rad 18 12 11.34 -18 41 30.2           ~ 4 0
6 MMB G011.904-00.141 cor 18 12 11.44 -18 41 28.6           ~ 45 0
7 W 33b SFR 18 13 54.68 -18 01 48.1           ~ 76 0
8 W 33c Rad 18 13 59.0 -17 57 38           ~ 14 0
9 W 33a Y*O 18 14 39.0 -17 52 03           ~ 594 0
10 IRAS 18174-1612 HII 18 20 24.6 -16 11 40           ~ 31 0
11 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1514 0
12 Caswell OH 020.23+00.07 Mas 18 27 44.1 -11 14 54           ~ 3 0
13 GAL 028.20-00.04 HII 18 42 58.2 -04 14 05           ~ 52 0
14 Caswell OH 028.21-00.05 Mas 18 43 00.3 -04 13 25           ~ 10 0
15 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 472 0
16 GAL 035.03+00.35 HII 18 54 01.0 +02 01 32           ~ 41 0
17 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 147 0
18 GAL 035.20-01.74 Y*O 19 01 47.0 +01 13 08           ~ 72 1
19 IRAS 19078+0901 HII 19 10 15.6 +09 06 05           ~ 32 0
20 W 49 SFR 19 10 20 +09 07.7           ~ 521 1
21 Caswell OH 045.12+00.13 HII 19 13 27.845 +10 53 36.74           ~ 114 0
22 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 138 0
23 [GPD88] 045.454+0.060 HII 19 14 21.3 +11 09 13           ~ 151 1
24 MSX6C G048.9897-00.2992 Y*O 19 22 26.2092 +14 06 32.935           ~ 25 1
25 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 145 0
26 W 58a HII 20 01 45.8 +33 32 43           ~ 278 4
27 OH 1959+33 Mas 20 01 54.03 +33 34 14.2           ~ 32 0
28 [KCW94] 069.540-00.975 HII 20 10 09.0 +31 31 35           ~ 167 1
29 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 170 0
30 Onsala 1 Mas 20 10 09.2036 +31 31 36.090           ~ 180 0
31 IRAS 20350+4126 HII 20 36 52.6 +41 36 33           ~ 39 1
32 18P 73 Rad 20 36 55.9 +41 36 29           ~ 41 0
33 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 365 1
34 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 85 0
35 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 365 0
36 2MASS J21430143+5456183 Y*O 21 43 01.438 +54 56 18.37           ~ 59 2
37 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 705 2
38 IRAS 22543+6145 HII 22 56 19.1 +62 01 57           ~ 71 0
39 NGC 7538 OpC 23 13 37 +61 30.0           ~ 834 0
40 IRAS 23116+6111 mul 23 13 45.6 +61 28 18           ~ 45 0

    Equat.    Gal    SGal    Ecl

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2021.04.17-08:37:04

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