The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. I. Identifying and Characterizing the Protostellar Content of the OMC-2 FIR4 and OMC-2 FIR3 Regions
Artikel i vetenskaplig tidskrift, 2019
We present Atacama Large Millimeter/submillimeter Array (0.87 mm) and Very Large Array (9 mm) observations toward OMC-2 FIR4 and OMC-2 FIR3 within the Orion integral-shaped filament, thought to be two of the nearest regions of intermediate-mass star formation. We characterize the continuum sources within these regions on ?40 au (01) scales and associated molecular line emission at a factor of ?30 better resolution than previous observations at similar wavelengths. We identify six compact continuum sources within OMC-2 FIR4, four in OMC-2 FIR3, and one additional source just outside OMC-2 FIR4. This continuum emission is tracing the inner envelope and/or disk emission on less than 100 au scales. HOPS-108 is the only protostar in OMC-2 FIR4 that exhibits emission from high-excitation transitions of complex organic molecules (e.g., methanol and other lines) coincident with the continuum emission. HOPS-370 in OMC-2 FIR3, with L;?;360 L, also exhibits emission from high-excitation methanol and other lines. The methanol emission toward these two protostars is indicative of temperatures high enough to thermally evaporate it from icy dust grains; overall, these protostars have characteristics similar to hot corinos. We do not identify a clear outflow from HOPS-108 in (CO)-C-12, but we find evidence of interaction between the outflow/jet from HOPS-370 and the OMC-2 FIR4 region. A multitude of observational constraints indicate that HOPS-108 is likely a low- to intermediate-mass protostar in its main mass accretion phase and is the most luminous protostar in OMC-2 FIR4. The high-resolution data presented here are essential for disentangling the embedded protostars from their surrounding dusty environments and characterizing them.
Star-forming regions
Radio interferometry
Interstellar medium
Young stellar objects
Protostars
Star formation
Författare
John J. Tobin
National Radio Astronomy Observatory
S. Thomas Megeath
University of Toledo
Merel van't Hoff
Universiteit Leiden
Ana Karla Diaz-Rodriguez
Instituto de Astrofisica de Andalucía (IAA)
Nickalas Reynolds
University of Oklahoma
Mayra Osorio
Consejo Superior de Investigaciones Científicas (CSIC)
Guillem Anglada
Consejo Superior de Investigaciones Científicas (CSIC)
Elise Furlan
California Institute of Technology (Caltech)
Nicole Karnath
University of Toledo
Stella S. R. Offner
The University of Texas at Austin
Patrick D. Sheehan
National Radio Astronomy Observatory
Sarah I. Sadavoy
Harvard-Smithsonian Center for Astrophysics
Amelia M. Stutz
Universidad de Concepción
Max-Planck-Gesellschaft
William J. Fischer
Space Telescope Science Institute (STScI)
Mihkel Kama
University of Cambridge
Magnus V. Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
James Di Francesco
National Research Council Canada
Leslie W. Looney
University of Illinois
Dan M. Watson
University of Rochester
Zhi-Yun Li
University of Virginia
Ian Stephens
Harvard-Smithsonian Center for Astrophysics
Claire J. Chandler
National Radio Astronomy Observatory
Erin Cox
Northwestern University
Michael M. Dunham
Harvard-Smithsonian Center for Astrophysics
SUNY Fredonia
Kaitlin Kratter
University of Arizona
Marina Kounkel
Western Washington University
Brian Mazur
University of Toledo
Nadia M. Murillo
Universiteit Leiden
Lisa Patel
University of Oklahoma
Laura Perez
Universidad de Chile (UCH)
Dominique Segura-Cox
Max-Planck-Gesellschaft
Rajeeb Sharma
University of Oklahoma
Lukasz Tychoniec
Universiteit Leiden
Friedrich Wyrowski
Max-Planck-Gesellschaft
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 886 1 6Ämneskategorier
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
DOI
10.3847/1538-4357/ab498f