2001MNRAS.324..643G


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET10:44:02

2001MNRAS.324..643G - Mon. Not. R. Astron. Soc., 324, 643-647 (2001/July-1)

Co-propagation of maser emission at 1720 and 4765 MHz.

GRAY M.D., COHEN R.J., RICHARDS A.M.S., YATES J.A. and FIELD D.

Abstract (from CDS):

MERLIN observations are presented of OH 4765-MHz and OH 1720-MHz masers in the massive star-forming region W3(OH). Two of the three intense spots of maser emission at 4765MHz are spatially coincident with two similar spots at 1720MHz in both left-hand circular(ref???[q1]) (LHC) and right-hand circular(ref???[q1]) (RHC) polarizations, to an accuracy of 15mas. The spots also overlap in velocity when allowance is made for Zeeman splitting of the 1720-MHz line. We conclude that we have found two examples of masers in different rotational levels of OH which are co-propagating through the same column of gas and experiencing competitive gain effects. The third 4765-MHz maser spot was found to have no overlapping counterpart amongst the 1720-MHz masers.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): masers - radiative transfer - circumstellar matter - ISM: individual: W3(OH) - radio lines: stars

Nomenclature: Table 1: [GCR2001] Spot A (Nos A-D)

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 935 2
2 6C 022440+670742 QSO 02 28 50.05148948 +67 21 03.0293039   19.5   18.1   ~ 226 1
3 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3492 3
4 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 459 2
5 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3650 1

    Equat.    Gal    SGal    Ecl

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2020.01.28-10:44:02

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