2005MNRAS.360..993P


Query : 2005MNRAS.360..993P

2005MNRAS.360..993P - Mon. Not. R. Astron. Soc., 360, 993-1006 (2005/July-1)

Very Large Array observations of broad 6-cm excited-state OH lines in W49A.

PALMER P. and GOSS W.M.

Abstract (from CDS):

Using the Very Large Array (VLA), we observed all three of the 6-cm lines of the 2Π1/2, J= 1/2 state of OH with sub-arcsecond resolution (∼0.4 arcsec) in W49A. While the spatial distribution and the range in velocities of the 6-cm lines are similar to those of the ground-state (18-cm) OH lines, a large fraction of the total emission in all three 6-cm lines has large linewidths (∼5-10 km/s) and is spatially extended, very unlike typical ground-state OH masers, which typically are point-like at VLA resolutions and have linewidths ≤1 km/s. We find brightness temperatures of 5900, 4700 and ≥730 K for the 4660, 4750 and 4765-MHz lines, respectively. We conclude that these are indeed maser lines. However, the gains are ∼0.3, again very unlike the 18-cm lines, which have gains ≥104. We compare the excited-state OH emission with that from other molecules observed with comparable angular resolution to estimate physical conditions in the regions emitting the peculiar, low-gain maser lines. We also comment on the relationship with the 18-cm masers.

Abstract Copyright: 2005 RAS

Journal keyword(s): masers - ISM: individual: W49A - ISM: molecules - radio lines: ISM

Simbad objects: 24

goto Full paper

goto View the references in ADS

Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 MPCM J022530.99+620620.9 HII 02 25 31.18 +62 06 24.5           O8V-B0.5V 101 1
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 995 2
3 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3835 3
4 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4145 2
5 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2133 1
6 QSO J1824+1044 Bla 18 24 02.85524975 +10 44 23.7739493   17.66 17.27 16.71   ~ 167 1
7 [DJW84] W49 R Rad 19 10 11.06 +09 05 20.2           ~ 9 0
8 [DJW84] W49 A HII 19 10 12.93 +09 06 11.9           ~ 32 0
9 [DJW84] W49 B HII 19 10 13.19 +09 06 12.8           ~ 20 0
10 [DJW84] W49 E HII 19 10 13.30 +09 06 12.5           ~ 13 0
11 [DJW84] W49 G1 HII 19 10 13.42 +09 06 12.8           ~ 21 0
12 [DJW84] W49 G2 HII 19 10 13.47 +09 06 13.2           ~ 18 0
13 [DJW84] W49 G3 Rad 19 10 13.55 +09 06 12.1           ~ 13 0
14 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 26 0
15 [DJW84] W49 G4 Rad 19 10 13.57 +09 06 13.5           ~ 13 0
16 [DJW84] W49 H HII 19 10 13.64 +09 06 17.2           ~ 12 0
17 [DJW84] W49 G5 Rad 19 10 13.66 +09 06 12.4           ~ 13 0
18 [DJW84] W49 J1 Rad 19 10 14.13 +09 06 25.2           ~ 8 0
19 [DJW84] W49 J2 Rad 19 10 14.18 +09 06 26.7           ~ 9 0
20 [DJW84] W49 L HII 19 10 14.54 +09 06 18.9           ~ 12 0
21 4FGL J1910.2+0904c SFR 19 10 15.7 +09 06 05           ~ 285 2
22 [DJW84] W49 O Rad 19 10 16.34 +09 06 07.1           ~ 9 0
23 NAME W 49A South HII 19 10 21.6 +09 05 03           ~ 53 2
24 NAME DR 21EX Rad 20 39 00.346 +42 24 39.14           ~ 4 0

To bookmark this query, right click on this link: simbad:objects in 2005MNRAS.360..993P and select 'bookmark this link' or equivalent in the popup menu


2022.11.30-11:09:08

© Université de Strasbourg/CNRS

    • Contact