Intermittent maser flare around the high mass young stellar object G353.273+0.641 I: data & overview

Abstract

We have performed VLBI and single-dish monitoring of 22 GHz H${}_2$O maser emission from the high mass young stellar object G353.273+0.641 with VERA (VLBI Exploration of Radio Astrometry) and Tomakamai 11-m radio telescope. Two maser flares have been detected, separated almost two years. Frequent VLBI monitoring has revealed that these flare activities have been accompanied by structural change of the prominent shock front traced by H2O maser alignments. We have detected only blue-shifted emissions and all maser features have been distributed within very small area of 200 $\times$ 200 au${}^2$ in spite of wide velocity range (> 100 km s${}^{-1}$). The light curve shows notably intermittent variation and suggests that the H${}_2$O masers in G353.273+0.641 are excited by episodic radio jet. The time-scale of \sim2 yr and characteristic velocity of \sim500 km s${}^{-1}$ also support this interpretation. Two isolated velocity components of C50 (-53 \pm 7 km s${}^{-1}$) and C70 (-73 \pm 7 km s${}^{-1}$) have shown synchronised linear acceleration of the flux weighted $V_{\rmn{LSR}}$ values (\sim-5 km s${}^{-1}$ yr${}^{-1}$) during the flare phase. This can be converted to the lower-limit momentum rate of 1.1 \times 10${}^{-3}$ M$_{\sun}$ km s${}^{-1}$ yr${}^{-1}$. Maser properties are quite similar to that of IRAS 20126+4104 especially. This corroborates the previous suggestion that G353.273+0.641 is a candidate of high mass protostellar object. The possible pole-on geometry of disc-jet system can be suitable for direct imaging of the accretion disc in this case.

13 pages, 5 figures accepted for publication in MNRAS

References in corpus (14)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• Evolution of Massive Protostars via Disk Accretion
• A hot compact dust disk around a massive young stellar object
• Second Core Formation and High Speed Jets: Resistive MHD Nested Grid Simulations
• Methanol and water masers in IRAS 20126+4104: The distance, the disk, and the jet
• The origin of large peculiar motions of star-forming regions and spiral structures of our Galaxy
• A wide-angle outflow with the simultaneous presence of a high-velocity jet in the high-mass Cepheus A HW2 system
• Water maser variability over 20 years in a large sample of star-forming regions: the complete database
• The Masers Towards IRAS 20126+4104
• New Distance and Revised Natures of High Mass Star Formation in G5.89-0.39
• Dynamics of the 6.7 and 12.2 GHz methanol masers around Cepheus A HW2
• Multiple Sources toward the High-mass Young Star S140 IRS1
• Microstructure and kinematics of H2O masers in the massive star forming region IRAS 06061+2151

Cited by in corpus (11)

• Parkes full polarization spectra of OH masers - I. Galactic longitudes 350 through the Galactic Centre to 41
• The first bird's-eye view of a gravitationally unstable accretion disk in high-mass star formation
• Accelerating a water maser face-on jet from a high mass young stellar object
• Parkes full polarization spectra of OH masers - II. Galactic longitudes 240 to 350
• Intermittent maser flare around the high mass young stellar object G353.273+0.641 II: Detection of a radio and molecular jet
• A Face-on Accretion System in High-Mass Star-Formation: Possible Dusty Infall Streams within 100 AU
• Discovery of four water masers in the Small Magellanic Cloud
• Masers in star forming regions
• Discovery of widespread non-metastable ammonia masers in the Milky Way
• A kinematic study of the disc-outflow system around a high-mass protostar G59.783+0.065 probed by methanol and water masers
• Proper Motions of Water Masers in the Star-forming Region IRAS 23139+5939