Protostars and Planets VI, Heidelberg, July 15-20, 2013
Poster 1S021
Complex kinematics in a highly filamentary IRDC
Henshaw, Jonathan D. (University of Leeds, UK)
Caselli, Paola (University of Leeds, UK)
Jimenez-Serra, Izaskun (European Southern Observatory, Germany)
Fontani, Francesco (Osservatorio Astrofisico di Arcetri, Italy)
Tan, Jonathan C. (University of Florida, USA)
Abstract:
Infrared Dark Clouds (IRDCs) are excellent environments within which we can study the initial condtions of high-mass stars and stellar cluster formation.
High spectral and angular resolution observations of molecular gas
tracers towards IRDCs are needed to study in detail their physical
properties and dynamics. In this poster we present high-sensitivity and
high-angular resolution N2H+ (1-0) observations of a highly-filamentary
IRDC, G035.39-00.33, taken with the Plateau de Bure Interferometer.
Our study reveals that G035.39-00.33 is comprised of several filamentary
structures that can be resolved both spectrally and spatially. These
filamentary structures are separated in velocity by ~ 1 km s-1. Typical
linewidths are found to be between 0.5-1.5 km s-1, indicating that the
gas motions are supersonic throughout the mapped region. We find that whilst the global kinematics of
the filaments are typically quiescent (showing small overall velocity
gradients), the kinematics of localised regions are highly dynamic. Our
results suggest that opposing velocity flows (velocity gradient ~ 2.5kms-1pc-1) are directed towards H6,
the most massive core located in the region. This may be a signature of
the on-going accumulation of material toward H6. In addition, we find
via the analysis of position-velocity slices perpendicular to the major
axis of the IRDC structure, that there exists relative shear motions
between the two main filamentary components (magnitude ~ 13kms-1pc-1). The shear motion between
these two closely related filamentary structures could be an
observational signature of the cloud formation process.
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