ALMA observations of the outflow from the Source I in the Orion-KL region

Abstract

In this {\it Letter}, we present sensitive millimeter SiO (J=5-4; $\nu$=0) line observations of the outflow arising from the enigmatic object Orion Source I made with the Atacama Large Millimeter/Submillimeter Array (ALMA). The observations reveal that at scales of a few thousand AU, the outflow has a marked "butterfly" morphology along a northeast-southwest axis. However, contrary to what is found in the SiO and H${}_2$O maser observations at scales of tens of AU, the blueshifted radial velocities of the moving gas are found to the northwest, while the redshifted velocities are in the southeast. The ALMA observations are complemented with SiO (J=8-7; $\nu$=0) maps (with a similar spatial resolution) obtained with the Submillimeter Array (SMA). These observations also show a similar morphology and velocity structure in this outflow. We discuss some possibilities to explain these differences at small and large scales across the flow.

Accepted to ApJL

References in corpus (3)

• Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
• Submillimeter arcsecond-resolution mapping of the highly collimated protostellar jet HH 211
• Imaging the Ionized Disk of the High-Mass Protostar Orion-I

Cited by in corpus (25)

• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• The ALMA View of the OMC1 Explosion in Orion
• The abundance of H2O and HDO in Orion KL from Herschel/HIFI
• Acetone in Orion BN/KL - High-resolution maps of a special oxygen-bearing molecule
• Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object
• Hot Molecular Circumstellar Disk around Massive Protostar Orion Source I
• ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
• A spider-like outflow in Barnard 5 - IRS 1: The transition from a collimated jet to a wide-angle outflow?
• VERA and ALMA Observations of the H2O Supermaser Burst in Orion KL
• The first detection of the 232 GHz vibrationally excited H2O maser in Orion KL with ALMA
• The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
• A study of dynamical processes in the Orion KL region using ALMA-- Probing molecular outflow and inflow
• Outflow Structure and Velocity Field of Orion Source I: ALMA Imaging of SiO Isotopologue Maser and Thermal Emission
• Sulfur-bearing molecules in Orion KL
• The First Mid-Infrared Detection of HNC in the Interstellar Medium: Probing the Extreme Environment Towards the Orion Hot Core
• The mid-infrared molecular inventory towards Orion IRc2
• A photoionized accretion disk around a young high-mass star
• ALMA Observation of the 658 GHz Vibrationally Excited H${}_2$O Maser in Orion KL Source I
• ALMA observations and modeling of the rotating outflow in Orion Source I
• ALMA band 8 continuum emission from Orion Source I
• A spectroscopic survey of Orion KL between 41.5 and 50 GHz
• Keck Adaptive Optics Observations of the Protostellar Disk around Radio Source I in the Orion Kleinmann-Low Nebula
• Extremely high excitation SiO lines in disk-outflow system in Orion Source I
• Morphologies of protostellar outflows: An ALMA view
• A molecular-line study of the interstellar bullet engine IRAS 05506+2414