2011ApJ...739L..59H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST10:45:40

2011ApJ...739L..59H - Astrophys. J., 739, L59 (2011/October-1)

Identification of bursting water maser features in Orion KL.

HIROTA T., TSUBOI M., FUJISAWA K., HONMA M., KAWAGUCHI N., KIM M.K., KOBAYASHI H., IMAI H., OMODAKA T., SHIBATA K.M., SHIMOIKURA T. and YONEKURA Y.

Abstract (from CDS):

In 2011 February, a burst event of the H2 O maser in Orion KL (Kleinmann-Low object) has started after a 13 year silence. This is the third time such phenomena has been detected in Orion KL, followed by the events in 1979-1985 and 1998. We have carried out astrometric observations of the bursting H2O maser features in Orion KL with the VLBI Exploration of Radio Astrometry (VERA), a Japanese very long baseline interferometry network dedicated for astrometry. The total flux of the bursting feature at the local standard of rest (LSR) velocity of 7.58 km/s reaches 4.4x104 Jy in 2011 March. The intensity of the bursting feature is three orders of magnitude larger than that of the same velocity feature in the quiescent phase in 2006. Two months later, another new feature appears at the LSR velocity of 6.95 km/s in 2011 May, separated by 12 mas north of the 7.58 km/s feature. Thus, the current burst occurs at two spatially different features. The bursting masers are elongated along the northwest-southeast direction as reported in the previous burst in 1998. We determine the absolute positions of the bursting features for the first time ever with a submilliarcsecond (mas) accuracy. Their positions are coincident with the shocked molecular gas called the Orion Compact Ridge. We tentatively detect the absolute proper motions of the bursting features toward the southwest direction. It is most likely that the outflow from the radio source I or another young stellar object interacting with the Compact Ridge is a possible origin of the H2 O maser burst.

Abstract Copyright:

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

Simbad objects: 7

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Number of rows : 7

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 QSO J0530+13 Bla 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 895 1
2 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 124 0
3 COUP 600 * 05 35 14.07 -05 22 36.6     15.906   12.799 M3 50 0
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2064 1
5 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
6 M 42 HII 05 35 17.3 -05 23 28           ~ 3787 0
7 QSO B0539-057 QSO 05 41 38.08338 -05 41 49.4284     20.4 20.70   ~ 219 2

    Equat.    Gal    SGal    Ecl

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2021.04.18-10:45:40

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