A HUNT FOR MASSIVE STARLESS CORES

A HUNT FOR MASSIVE STARLESS CORES

ABSTRACT We carry out an ALMA (3-2) and 1.3 mm continuum survey of 32 high-mass surface density regions of seven infrared dark clouds, with the aim of finding massive starless cores that may form the initial conditions for the formation of massive stars. Cores showing strong (3-2) emission are expec...

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Bibliographic Details
Published in:The Astrophysical journal 2017-01, Vol.834 (2), p.193
Main Authors: Kong, Shuo, Tan, Jonathan C., Caselli, Paola, Fontani, Francesco, Liu, Mengyao, Butler, Michael J.
Format: Article
Language:eng
Subjects:
ALGORITHMS
astrochemistry
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cores
Deuteration
DISPERSIONS
EMISSION
EQUILIBRIUM
Gamma rays
Initial conditions
ISM: clouds
ISM: kinematics and dynamics
ISM: magnetic fields
MAGNETIC FIELDS
MASS
Massive stars
SPACE
Star & galaxy formation
Star formation
STARS
stars: formation
stars: massive
SURFACES
Tracers
VELOCITY
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Summary:ABSTRACT We carry out an ALMA (3-2) and 1.3 mm continuum survey of 32 high-mass surface density regions of seven infrared dark clouds, with the aim of finding massive starless cores that may form the initial conditions for the formation of massive stars. Cores showing strong (3-2) emission are expected to be highly deuterated and indicative of early, potentially pre-stellar stages of star formation. We also present maps of these regions in ancillary line tracers, including C18O(2-1), DCN(3-2), and DCO+(3-2). Over 100 cores are identified with our newly developed core-finding algorithm, based on connected structures in position-velocity space. The most massive core has (potentially ) and so may be representative of the initial conditions or early stages of massive star formation. The existence and dynamical properties of such cores constrain massive star formation theories. We measure the line widths and thus velocity dispersion of six of the cores with strongest (3-2) line emission, finding results that are generally consistent with virial equilibrium of pressure confined cores.
ISSN:0004-637X
1538-4357