2004MNRAS.352..101C

Query : 2004MNRAS.352..101C

2004MNRAS.352..101C - Mon. Not. R. Astron. Soc., 352, 101-111 (2004/July-3)

New OH masers at 13 441 MHz.

CASWELL J.L.

Abstract (from CDS):

The Parkes radio telescope has been used to study maser emission from the 13441-MHz transition of highly excited OH. The targets were 56 catalogued sites of 6035-MHz maser emission. Eight 13441-MHz maser sites were detected, six of them new and two that had previously been reported. This more than doubles the number now known to 11.

At every 13441-MHz maser site, spectral features occur as right- and left-hand circularly polarized matched pairs, with small, but mostly significant, frequency separation. This is attributed to the Zeeman effect in magnetic fields of a few mG. Some of the 13441-MHz maser sites show features at several different velocities.

All of the 13441-MHz maser features have 6035-MHz counterparts that closely correspond in velocity. At three sites, features of 13441-MHz emission rival the intensities of their 6035-MHz counterparts; at the other sites, features are weaker than at 6035 MHz by factors of between 3 and 50. Upper limits at some sites searched can be set more than 2 orders of magnitude weaker than 6035-MHz emission. The detection statistics provide unique opportunities to test recent advances in maser modelling.

A search for the 13434-MHz transition towards the same 56 targets yielded no detections.


Abstract Copyright: 2004 RAS

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

Simbad objects: 60

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Number of rows : 60
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 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
2 OH 240.32+00.07 Mas 07 44 51.9676 -24 07 41.372           ~ 14 0
3 OH 284.35-00.42 Mas 10 24 10.73 -57 52 33.3           ~ 7 0
4 OH 285.26-00.05 Mas 10 31 29.87 -58 02 18.0           ~ 22 0
5 OH 294.51-01.62 Mas 11 35 32.25 -63 14 43.2           ~ 18 0
6 OH 300.97+01.15 Mas 12 34 53.29 -61 39 40.0           ~ 31 0
7 OH 305.21+00.03 Mas 13 11 16.8912 -62 45 55.008           ~ 20 0
8 OH 309.92+00.48 Mas 13 50 41.78 -61 35 10.2           ~ 50 0
9 IRAS 14026-6145 * 14 06 18.459 -62 00 15.76           ~ 6 0
10 IRAS 14030-6144 cor 14 06 38.75088 -61 58 23.7576           ~ 36 0
11 OH 311.64-00.38 Mas 14 06 38.77 -61 58 23.1           ~ 32 0
12 IRAS 15254-5621 Y*? 15 29 19.33 -56 31 22.8           ~ 108 0
13 OH 328.30+00.44 Mas 15 54 06.48 -53 11 40.3           ~ 18 0
14 Caswell CH3OH 328.809+00.633 Mas 15 55 48.70 -52 43 05.5           ~ 24 0
15 OH 328.24-00.55 Mas 15 57 58.28 -53 59 22.7           ~ 38 0
16 OH 329.339+00.148 Mas 16 00 33.15 -52 44 39.9           ~ 4 0
17 OH 330.9-00.2 OH* 16 09 35.53920 -51 54 14.1084           O-rich 12 0
18 OH 331.542-00.066 Mas 16 12 09.02 -51 25 47.6           ~ 12 0
19 Caswell H2O 331.51-00.10 Mas 16 12 09.1 -51 28 53           ~ 12 0
20 OH 332.826-00.549 Mas 16 20 10.85 -50 53 14.2           ~ 16 0
21 OH 333.14-00.43 Mas 16 21 02.82 -50 35 12.0           ~ 19 0
22 OH 333.6-00.2 Mas 16 22 11.042 -50 05 56.25           ~ 22 0
23 OH 336.83+00.02 Mas 16 34 38.28 -47 36 32.2           ~ 19 0
24 OH 336.941-00.156 Mas 16 35 55.19 -47 38 45.4           ~ 9 0
25 OH 337.61-00.06 Mas 16 38 09.54 -47 04 59.9           ~ 25 0
26 MMB G337.705-00.053 Mas 16 38 29.63 -47 00 35.5           ~ 26 0
27 OH 337.40-00.41 Mas 16 38 50.52 -47 28 00.2           ~ 40 0
28 MMB G339.053-00.315 Mas 16 44 48.99 -46 10 13.0           ~ 11 0
29 OH 340.78-00.10 Mas 16 50 14.84 -44 42 26.3           ~ 50 0
30 OH 339.88-01.26 Y*O 16 52 04.6776 -46 08 34.404           ~ 119 1
31 OH 345.01+01.79 Mas 16 56 47.58 -40 14 25.8           ~ 72 0
32 OH 343.93+00.12 Mas 17 00 10.91 -42 07 19.3           ~ 18 0
33 OH 345.487+00.314 Mas 17 04 28.24 -40 46 28.7           ~ 12 0
34 MMB G345.003-00.224 Mas 17 05 11.23 -41 29 06.9           ~ 14 0
35 OH 345.70-00.09 Y*O 17 06 50.635 -40 50 59.49           ~ 37 0
36 OH 347.63+00.15 Y*? 17 11 51.064 -39 09 29.03           ~ 43 0
37 OH 348.698-01.027 Mas 17 19 58.923 -38 58 14.13           ~ 5 0
38 OH 351.41+00.64 Mas 17 20 53.4 -35 47 01           ~ 58 0
39 OH 350.686-00.491 Mas 17 23 28.63 -37 01 48.8           ~ 11 0
40 OH 351.58-00.35 Mas 17 25 25.183 -36 12 44.66           ~ 18 0
41 OH 351.75-00.53 Mas 17 26 42.57 -36 09 17.6           ~ 74 1
42 OH 353.41-00.36 Mas 17 30 26.18 -34 41 45.6           ~ 65 0
43 IRAS 17279-3311 Y*? 17 31 15.5976886344 -33 14 04.872124932           ~ 37 0
44 OH 355.34+00.15 Mas 17 33 29.06 -32 47 58.9           ~ 28 0
45 OH 359.14+00.03 Mas 17 43 25.6109 -29 39 17.551           ~ 36 0
46 OH 000.666-00.029 Mas 17 47 18.64 -28 22 54.6           ~ 3 0
47 OH 000.658-00.042 Mas 17 47 20.485 -28 23 44.13           ~ 18 0
48 MMB G008.669-00.356 Mas 18 06 18.99 -21 37 32.2           ~ 41 0
49 OH 011.03+00.06 Mas 18 09 39.84 -19 21 20.3           ~ 31 0
50 OH 011.90-00.14 Mas 18 12 11.44 -18 41 28.6           ~ 25 0
51 W 33 SFR 18 14 14.0 -17 55 50           ~ 292 0
52 OH 015.03-00.68 Mas 18 20 24.8111 -16 11 35.316           ~ 31 1
53 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
54 OH 019.48+00.15 Mas 18 26 00.39 -11 52 21.9           ~ 6 0
55 OH 020.23+00.07 Mas 18 27 44.56 -11 14 54.6           ~ 11 0
56 Caswell OH 035.02+00.35 Mas 18 54 00.6576 +02 01 19.217           ~ 17 0
57 OH 035.2-00.7 Mas 18 58 13.0517 +01 40 35.674           ~ 49 0
58 OH 045.122+00.133 Mas 19 13 27.942 +10 53 34.84           ~ 8 0
59 OH 045.466+00.045 Mas 19 14 25.66 +11 09 26.5           ~ 4 0
60 OH 049.490-00.388 Mas 19 23 43.93 +14 30 34.9           ~ 4 0

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