ALMA Images of the Orion Hot Core at 349 GHz

Abstract

We present ALMA images of the dust and molecular line emission in the Orion Hot Core at 349 GHz. At 0.2" angular resolution the images reveal multiple clumps in an arc ~ 1" east of Orion Source I, the protostar at the center of the Kleinmann-Low Nebula, and another chain of peaks from IRc7 towards the southwest. The molecular line images show narrow filamentary structures at velocities > 10 km/s away from the heavily resolved ambient cloud velocity ~5 km/s. Many of these filaments trace the SiO outflow from Source I, and lie along the edges of the dust emission. Molecular line emission at excitation temperatures 300--2000 K, and velocities > 10 km/s from the ambient cloud, suggest that the Hot Core may be heated in shocks by the outflow from Source I or from the BN/Source I explosion. The spectral line observations also reveal a remarkable molecular ring, ~ 2" south of Source I, with a diameter ~ 600 AU. The ring is seen in high excitation transitions of HC3N, HCN v2=1, and SO2. An impact of ejecta from the BN/Source I explosion with a dense dust clump could result in the observed ring of shocked material.

arXiv comment6 pages, 4 figures

References in corpus (18)

• The distance to the Orion Nebula
• A Feature Movie of SiO Emission 20-100 AU from the Massive Young Stellar Object Orion Source I
• Explosive Outflows Powered by the Decay of Non-Hierarchical Multiple Systems of Massive Stars: Orion BN/KL
• Explosive Disintegration of a Massive Young Stellar System in Orion
• Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
• The ALMA View of the OMC1 Explosion in Orion
• A Multi-Epoch Study of the Radio Continuum Emission of Orion Source I: Constraints on the Disk Evolution of a Massive YSO and the Dynamical History of Orion BN/KL
• Tracing the Bipolar Outflow from Orion Source I
• Unveiling Sources of Heating in the Vicinity of the Orion BN/KL Hot Core as Traced by Highly Excited Inversion Transitions of Ammonia
• High Angular Resolution Mid-infrared Imaging of Young Stars in Orion BN/KL
• Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object
• ALMA Observations of Orion Source I at 350 and 660 GHz
• Discovery of an expanding molecular bubble in Orion BN/KL
• ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
• Magnetic Field Morphology of Orion-IRc2 from 86 GHz SiO Maser Polarization Images
• The Ionized Circumstellar Envelopes of Orion Source I and the Becklin Neugebauer Object
• ALMA band 8 continuum emission from Orion Source I
• MHD Modeling of a Disk-Wind from a High-Mass Protobinary: the case of Orion Source I

Cited by in corpus (17)

• Chemical segregation of complex organic O-bearing species in Orion KL
• The complexity of Orion: an ALMA view. II. gGg'-Ethylene Glycol and Acetic Acid
• Exploring molecular complexity with ALMA (EMoCA): Complex isocyanides in Sgr B2(N)
• OMC-1 dust polarisation in ALMA Band 7: Diagnosing grain alignment mechanisms in the vicinity of Orion Source I
• High Spectral Resolution SOFIA/EXES Observations of C2H2 towards Orion-IRc2
• Sulfur-bearing molecules in Orion KL
• ALMA observations of the archetypal "hot core" that isn't: Orion KL
• The First Mid-Infrared Detection of HNC in the Interstellar Medium: Probing the Extreme Environment Towards the Orion Hot Core
• The complexity of Orion: an ALMA view III. The explosion impact
• The mid-infrared molecular inventory towards Orion IRc2
• ALMA Observations of Ethyl Formate toward Orion KL
• Observations of Orion Source I Disk and Outflow Interface
• Magnetic Field Structure of Orion Source I
• Observational evidence for rotational desorption of Complex Molecules by radiative torques from Orion BN/KL
• Mapping physical parameters in Orion KL at high spatial resolution
• Unmasking the physical information inherent to interstellar spectral line profiles with Machine Learning. I. Application of LTE to HCN and HNC transitions
• Molecular Formation in Low-Metallicity Hot Cores