Identification of Bursting Water Maser Features in Orion Kl

Hirota, Tomoya; Tsuboi, Masamichi; Fujisawa, Kenta; Honma, Mareki; Kawaguchi, Noriyuki; Kim, Mi Kyoung; Kobayashi, Hideyuki; Imai, Hiroshi; Omodaká, Toshihiro; Shibata, Katsunori M.; Shimoikura, Tomomi; Yonekura, Yoshinori

doi:10.1088/2041-8205/739/2/l59

Cited by 25 publications

(49 citation statements)

References 17 publications

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“…One of such example is the study of the maser burst in Orion KL (Hirota et al 2011b;Hirota et al 2012), in which the location and motion of the bursting maser component has been identified with mas-precision for the first time. Based on its location and motion, Hirota et al(2011b) suggested that the burst was probably caused by the interaction of an outflow and the molecular gas in the Orion Compact Ridge. Another example is H 2 O maser monitoring of G353.273+0.641 conducted by Motogi et al(2011), which revealed a possible acceleration in the maser motions associated with high velocity outflow.…”

Section: Summary Of Recent Results For Individual Sourcesmentioning

confidence: 99%

Maser astrometry with VERA and Galactic structure

et al. 2012

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Abstract. Since 2007 VERA (VLBI Exploration of Radio Astrometry) has been producing astrometric results (distances and/or proper motions) for Galactic maser sources. Nearly 30 parallaxes have been obtained for star-forming regions and late-type stars. By using VERA's astrometric results for star-forming regions, combined with those obtained with VLBA and EVN, fundamental Galactic parameters and Galactic structure may be derived. Our results show that R 0 = 8.4 ± 0.4 kpc and Ω ≡ Ω0 + V /R0 = 30.7 ± 0.8 km s −1 kpc −1 , and also show that the rotation curve of the Galaxy is nearly flat. The determinations of Galactic parameters and structures demonstrate that the maser astrometry can not only contribute significantly to research of individual maser sources, but also to studies of the structure of the Galaxy.

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Section: Summary Of Recent Results For Individual Sourcesmentioning

confidence: 99%

Maser astrometry with VERA and Galactic structure

et al. 2012

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“…One of the possibilities is an existence of another pre-existing YSO in Compact Ridge interacting with the powerful outflow from source I (Garay et al 1989). In fact, there are number of closer infrared, radio and X-ray sources around the bursting maser features than source I (see discussion in Hirota et al 2011 andFavre et al 2011). Because of the lack of high resolution observations resolving these continuum sources as well as their velocity structures, the powering source of the bursting maser features is still debatable.…”

Section: Discussionmentioning

confidence: 99%

“…With this in mind, we have started astrometric observations of the bursting H 2 O maser in Orion KL with VERA (VLBI Exploration of Radio Astrometry), a Japanese VLBI network developed for astrometry. Further details are described in Hirota et al (2011).…”

Section: Introductionmentioning

confidence: 99%

VERA Observations of the H₂O Maser Burst in Orion KL

et al. 2012

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Abstract. In 2011 February, a burst of the 22 GHz H2 O maser in Orion KL was reported. In order to identify the bursting maser features, we have been carrying out observations of the 22 GHz H2 O maser in Orion KL with VERA, a Japanese VLBI network dedicated for astrometry. The bursting maser turns out to consist of two spatially different features at 7.58 and 6.95 km s −1 . We determine their absolute positions and find that they 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, perpendicular to the elongation of the maser features. It is most likely that the outflow from the radio source I or another young stellar object interacting with Compact Ridge is a possible origin of the H 2 O maser burst. We will also carry out observations with ALMA in the cycle 0 period to monitor the submillimeter H2 O maser lines in the Orion Compact Ridge region. These follow-up observations will provide novel information on the physical and chemical properties of the mastering region.

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“…(J2000) = −05 d 22′36 486 (Hirota et al 2011(Hirota et al , 2014b. Because the original target of our ALMA Cycle 0 project was the supermaser, SourceI was detected serendipitously.…”

Section: Observationsmentioning

confidence: 99%

ALMA OBSERVATION OF THE 658 GHz VIBRATIONALLY EXCITED H₂O MASER IN ORION KL SOURCE I

Hirota

Kim

Honma

2016

ApJ

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We present an observational study of the vibrationally excited H 2 O line at 658 GHz ( 2 n = 1, 1 1,0 -1 0,1 ) toward Orion KL using the Atacama Large Millimeter/Submillimeter Array (ALMA). This line is clearly detected at the position of the massive protostar candidate, SourceI. The spatial structure is compact, with a size of about 100 AU, and is elongated along the northeast-southwest low-velocity (18 km −1 ) bipolar outflow traced by 22 GHz H 2 O masers, SiO masers, and thermal SiO lines. A velocity gradient can be seen perpendicular to the bipolar outflow. The overall spatial and velocity structure seems to be analogous to that of the 321 GHz H 2 O maser line previously detected with ALMA and vibrationally excited SiO maser emission. The brightness temperature of the 658 GHz H 2 O line is estimated to be higher than 2×10 4 K, implying that it is emitted via maser action. Our results suggest that the 658 GHz H 2 O maser line is emitted from the base of the outflow from a rotating and expanding accretion disk as observed for the SiO masers and the 321 GHz H 2 O maser. We also search for two other H 2 O lines at 646 GHz (9 7,3 -8 8,0 and 9 7,2 -8 8,1 ), but they are not detected in Orion KL.

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Identification of Bursting Water Maser Features in Orion Kl

Cited by 25 publications

References 17 publications

Maser astrometry with VERA and Galactic structure

Maser astrometry with VERA and Galactic structure

VERA Observations of the H₂O Maser Burst in Orion KL

ALMA OBSERVATION OF THE 658 GHz VIBRATIONALLY EXCITED H₂O MASER IN ORION KL SOURCE I

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Identification of Bursting Water Maser Features in Orion Kl

Cited by 25 publications

References 17 publications

Maser astrometry with VERA and Galactic structure

Maser astrometry with VERA and Galactic structure

VERA Observations of the H2O Maser Burst in Orion KL

ALMA OBSERVATION OF THE 658 GHz VIBRATIONALLY EXCITED H2O MASER IN ORION KL SOURCE I

Contact Info

Product

Resources

About

VERA Observations of the H₂O Maser Burst in Orion KL

ALMA OBSERVATION OF THE 658 GHz VIBRATIONALLY EXCITED H₂O MASER IN ORION KL SOURCE I