70 citations · 383 across the 27 of their papers we have counts for
28 papers
The Extraordinary Maser Flaring Event in the Massive Protostellar System NGC6334I: Multi-Epoch Milliarcsecond Resolution Investigation of the 6.7-GHz Methanol Masers
Jayender Kumar, Simon P. Ellingsen, Gabor Orosz +4
We report the first multi-epoch milliarcsecond resolution imaging of the 6.7-GHz class II methanol maser emission associated with the high-mass protocluster system NGC6334I. The ob…
The Limits of Water Maser Kinematics: Insights from High-Mass Protostar AFGL 5142-MM1
Zulfazli Rosli, Ross A. Burns, Affan Adly Nazri +14
Multi-epoch VLBI observations measure 3D water maser motions in protostellar outflows, enabling analysis of inclination and velocity. However, these analyses assume that water mase…
FLASHING: Project Overview
Hiroshi Imai, Yuhki Hamae, Kei Amada +8
This paper describes the overview of the FLASHING (Finest Legacy Acquisitions of SiO-/ HO-maser Ignitions by the Nobeyama Generation) project promoted using the 45 m telescope…
A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar
R. A. Burns, Y. Uno, N. Sakai +34
High-mass protostars (M 8 M) are thought to gain the majority of their mass via short, intense bursts of growth. This episodic accretion is thought to be faci…
A heat-wave of accretion energy traced by masers in the G358-MM1 high-mass protostar
R. A. Burns, K. Sugiyama, T. Hirota +20
High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion. Such accretion events are rare and difficult to observe directly…
Evolution of the outflow in the water fountain source IRAS 180432116
L. Uscanga, H. Imai, J. F. Gómez +5
We present the spectral and spatial evolution of HO masers associated with the water fountain source IRAS 180432116 found in the observations with the Nobeyama 45 m telescop…
Multi-frequency VLBI observations of maser lines during the 6.7~GHz maser flare in the high-mass young stellar object G24.330.14}
A. Kobak, A. Bartkiewicz, M. Szymczak +13
Recent studies have shown that 6.7 GHz methanol maser flares can be a powerful tool for verifying the mechanisms of maser production and even the specific signatures of accretion r…
Very long baseline interferometry observations of the high-redshift blazar candidate J0141-5427
K. É. Gabányi, S. Belladitta, S. Frey +7
Active galactic nuclei (AGN) have been observed as far as redshift z~7. They are crucial in investigating the early Universe as well as the growth of supermassive black holes at th…
Inverse MultiView II: Microarcsecond Trigonometric Parallaxes for Southern Hemisphere 6.7~GHz Methanol Masers G232.62+00.99 and G323.7400.26
Lucas J. Hyland, Mark J. Reid, Gabor Orosz +11
We present the first results from the Southern Hemisphere Parallax Interferometric Radio Astrometry Legacy Survey (\spirals): as-accurate parallaxes and proper motions for two…
The Astrometric Animation of Water Masers towards the Mira Variable BX Cam
Shuangjing Xu, Hiroshi Imai, Youngjoo Yun +20
We report VLBI monitoring observations of the 22 GHz water (HO) masers around the Mira variable BX Cam, which were carried out as a part of the EAVN Synthesis of Stellar Mase…
Inverse Multview I: Multi-Calibrator inverse phase referencing for Microarcsecond VLBI Astrometry
Lucas J. Hyland, Mark J. Reid, Simon P. Ellingsen +5
Very Long Baseline Interferometry (VLBI) astrometry is a well established technique for achieving as parallax accuracies at frequencies well above 10~GHz. At lower frequen…
Molecular line search toward the flaring 6.7-GHz methanol masers of G24.33+0.13 and G359.6-0.243: rare maser transitions detected
Tiege McCarthy, Gabor Orosz, Simon Ellingsen +8
We have performed a molecular line search toward the flaring 6.7-GHz masers G24.33+0.13 and G359.62-0.24 using the Australia Telescope Compact Array. We present spectra of the 6.7-…
Fallback in bipolar Planetary Nebulae ?
Willem A. Baan, Hiroshi Imai, Gabor Orosz
The subclass of bipolar Planetary Nebulae (PN) exhibits well-defined low-power outflows and some show shock-related equatorial spiderweb structures and hourglass structures surroun…
Infrared observations of the flaring maser source G358.93-0.03 -- SOFIA confirms an accretion burst from a massive young stellar object
B. Stecklum, V. Wolf, H. Linz +24
Class II methanol masers are signs of massive young stellar objects (MYSOs). Recent findings show that MYSO accretion bursts cause flares of these masers. Thus, maser monitoring ca…
FLASHING: New high-velocity HO masers in IRAS 182860959
Hiroshi Imai, Yuri Uno, Daichi Maeyama +8
We discovered new high-velocity components of HO maser emission in one of the "water fountain" sources, IRAS~182860959, which has been monitored using the Nobeyama 45 m tele…
Shaping the envelope of the asymptotic giant branch star W43A with a collimated fast jet
Daniel Tafoya, Hiroshi Imai, Jose F. Gomez +3
One of the major puzzles in the study of stellar evolution is the formation process of bipolar and multi-polar planetary nebulae. There is growing consensus that collimated jets cr…
VLBI observations of the G25.65+1.05 water maser superburst
R. A. Burns, G. Orosz, O. Bayandina +23
This paper reports observations of a 22 GHz water maser `superburst' in the G25.65+1.05 massive star forming region, conducted in response to an alert from the Maser Monitoring Org…
Spatio-kinematical model of the collimated molecular outflow in the water-fountain nebula IRAS 16342-3814
D. Tafoya, G. Orosz, W. H. T. Vlemmings +2
In this work we aimed to describe the three-dimensional morphology and kinematics of the molecular gas of the water-fountain nebula IRAS 16342-3814. In order to do this, we retriev…
Multi-epoch VLBI of a double maser super burst
Ross A. Burns, Olga Bayandina, Gabor Orosz +20
In a rare and spectacular display, two well-known massive star forming regions, W49N and G25.65+1.05, recently underwent maser 'super burst' - their fluxes suddenly increasing abov…
Rapidly-evolving episodic outflow in IRAS 18113-2503: clues to the ejection mechanism of the fastest water fountain
Gabor Orosz, Jose F. Gomez, Hiroshi Imai +11
Water fountains are evolved stars showing early stages of collimated mass loss during transition from the asymptotic giant branch, providing valuable insight into the formation of…
VERA monitoring of the radio jet 3C 84 during 2007--2013: detection of non-linear motion
Koichiro Hiura, Hiroshi Nagai, Motoki Kino +13
We present a kinematic study of the subparsec-scale radio jet of the radio galaxy 3C 84/NGC 1275 with the VLBI Exploration of Radio Astrometry (VERA) array at 22 GHz for 80 epochs…
MultiView phase corrections at low frequencies for precise astrometry
Gabor Orosz, Maria J. Rioja, Richard Dodson +2
We present a multi-calibrator solution, i.e. MultiView, to achieve accurate astrometry on the level of the thermal noise at low VLBI frequencies dominated by ionospheric residuals.…
Bow shocks in water fountain jets
Gabor Orosz, José F. Gómez, Daniel Tafoya +4
We briefly introduce the VLBI maser astrometric analysis of IRAS 18043-2116 and IRAS 18113-2503, two remarkable and unusual water fountains with spectacular bipolar bow shocks in t…
Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. Annual parallaxes of WX Psc and OH138.0+7.2
G. Orosz, H. Imai, R. Dodson +9
We report on the measurement of the trigonometric parallaxes of 1612 MHz hydroxyl masers around two asymptotic giant branch stars, WX Psc and OH138.0+7.2, using the NRAO Very Long…