2005MNRAS.356..839G

Query : 2005MNRAS.356..839G

2005MNRAS.356..839G - Mon. Not. R. Astron. Soc., 356, 839-848 (2005/January-3)

Very Long Baseline Array imaging of a periodic 12.2-GHz methanol maser flare in G9.62+0.20E.

GOEDHART S., MINIER V., GAYLARD M.J. and VAN DER WALT D.J.

Abstract (from CDS):

The class II methanol maser source G9.62+0.20E undergoes periodic flares at both 6.7 and 12.2 GHz. The flare starting in 2001 October was observed at seven epochs over three months using the Very Long Baseline Array (VLBA) at 12.2 GHz. High angular resolution images (beam size ∼1.7x0.6 mas) were obtained, enabling us to observe changes in 16 individual maser components. It was found that while existing maser spots increased in flux density, no new spots developed and no changes in morphology were observed. This rules out any mechanism which disturbs the masing region itself, implying that the flares are caused by a change in either the seed or pump photon levels. A time delay of one to two weeks was observed between groups of maser features. These delays can be explained by light travel time between maser groups. The regularity of the flares can possibly be explained by a binary system.

Abstract Copyright: 2004 RAS

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

CDS comments: Table 2: components of the maser are not in Simbad.

Simbad objects: 10

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Number of rows : 10
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 V* FU Ori Or* 05 45 22.3647842544 +09 04 12.291320064   10.72 9.60     F0Iab 888 1
2 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
3 [GRM93] G09.61+0.20 A Rad 18 06 11.9 -20 31 41           ~ 15 0
4 [GRM93] G09.61+0.20 B Rad 18 06 14.1 -20 31 43           ~ 19 0
5 [GRM93] G09.61+0.20 C HII 18 06 14.4 -20 31 25           ~ 19 0
6 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 56 0
7 [GRM93] G09.61+0.20 E HII 18 06 14.7 -20 31 32           ~ 51 0
8 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 29 1
9 [GRM93] G09.61+0.20 D HII 18 06 14.9 -20 31 43           ~ 20 0
10 OH 009.619+00.193 Mas 18 06 14.92 -20 31 44.3           ~ 10 0

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