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  Gas velocity structure of the Orion A integral-shaped filament

González Lobos, V., & Stutz, A. M. (2019). Gas velocity structure of the Orion A integral-shaped filament. Monthly Notices of the Royal Astronomical Society, 489, 4771-4782.

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 Creators:
González Lobos, Valentina1, Author
Stutz, Amelia M.1, Author
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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: Stars: formation ISM: clouds ISM: kinematics and dynamics open clusters and associations: individual: M42 (ONC)
 Abstract: We present analysis of the gas kinematics of the integral-shaped filament (ISF) in Orion A using four different molecular lines, 12CO (1-0), 13CO (1-0), NH3 (1,1), and N2H+ (1-0). We describe our method to visualize the position-velocity (PV) structure using the intensity-weighted line velocity centroid, which enables us to identify structures that were previously muddled or invisible. We observe a north-to-south velocity gradient in all tracers that terminates in a velocity peak near the centre of the Orion Nebula Cluster (ONC), consistent with the previously reported `wave-like' properties of the ISF. We extract the velocity dispersion profiles and compare the non-thermal line widths to the gas gravitational potential. We find supersonic Mach number profiles, yet the line widths are consistent with the gas being deeply gravitationally bound. We report the presence of two 12CO velocity components along the northern half of the ISF; if interpreted as circular rotation, the angular velocity is œâ =1.4 Myr^{-1}. On small scales we report the detection of N2H+ and NH3 `twisting and turning' structures, with short associated time-scales that give the impression of a torsional wave. Neither the nature of these structures nor their relation to the larger scale wave is presently understood.

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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 489 Sequence Number: - Start / End Page: 4771 - 4782 Identifier: -