The Orion fingers: Near-IR spectral imaging of an explosive outflow

Abstract

We present near-IR (1.1-2.4 micron) position-position-velocity cubes of the 500-year-old Orion BN/KL explosive outflow with spatial resolution 1" and spectral resolution 86 km/s. We construct integrated intensity maps free of continuum sources of 15 H2 and [Fe II] lines while preserving kinematic information of individual outflow features. Included in the detected H2 lines are the 1-0 S(1) and 1-0 Q(3) transitions, allowing extinction measurements across the outflow. Additionally, we present dereddened flux ratios for over two dozen outflow features to allow for the characterization of the true excitation conditions of the BN/KL outflow. All ratios show the dominance of shock excitation of the H2 emission, although some features exhibit signs of fluorescent excitation from stellar radiation or J-type shocks. We also detect tracers of the PDR/ionization front north of the Trapezium stars in [O I] and [Fe II] and analyze other observed outflows not associated with the BN/KL outflow.

arXiv comment20 pages, 15 figures, accepted for publication in AJ

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• Molecular outflows: Explosive versus protostellar
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• The Orion fingers: H${}_2$ temperatures and excitation in an explosive outflow
• Mapping physical parameters in Orion KL at high spatial resolution
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• Formation of Orion Fingers
• The influence of atomic alignment on absorption and emission spectroscopy