A census of molecular hydrogen outflows and their sources along the Orion A molecular ridge - Characteristics and overall distribution

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Volume 496 / No 1 (March II 2009)

A&A, 496 1 (2009) 153-176

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Table 1:

Mean and median Nearest Neighbour (NN) radii for protostars (all sources, sources with H₂ outflows, and sources without) in Orion A. The standard deviation (std) is given in brackets. North and South refer to protostars located north or south of declination -6 $^{\circ }$ , respectively.
Region	5th NN	6th NN	7th NN	10th NN	20th NN
	mean(std)median	mean(std)median	mean(std)median	mean(std)median	mean(std)median
All Protostars	0.087 $^{\circ }$ (0.09 $^{\circ }$ )0.060 $^{\circ }$	0.097 $^{\circ }$ (0.10 $^{\circ }$ )0.070 $^{\circ }$	0.106 $^{\circ }$ (0.10 $^{\circ }$ )0.079 $^{\circ }$	0.13 $^{\circ }$ (0.11 $^{\circ }$ )0.11 $^{\circ }$	0.20 $^{\circ }$ (0.11 $^{\circ }$ )0.18 $^{\circ }$
Protostars with flow	0.077 $^{\circ }$ (0.06 $^{\circ }$ )0.064 $^{\circ }$	0.089 $^{\circ }$ (0.07 $^{\circ }$ )0.085 $^{\circ }$	0.098 $^{\circ }$ (0.07 $^{\circ }$ )0.096 $^{\circ }$	0.13 $^{\circ }$ (0.08 $^{\circ }$ )0.12 $^{\circ }$	0.19 $^{\circ }$ (0.10 $^{\circ }$ )0.20 $^{\circ }$
Protostars no flow	0.090 $^{\circ }$ (0.10 $^{\circ }$ )0.055 $^{\circ }$	0.100 $^{\circ }$ (0.11 $^{\circ }$ )0.061 $^{\circ }$	0.109 $^{\circ }$ (0.11 $^{\circ }$ )0.073 $^{\circ }$	0.13 $^{\circ }$ (0.12 $^{\circ }$ )0.09 $^{\circ }$	0.20 $^{\circ }$ (0.12 $^{\circ }$ )0.17 $^{\circ }$
All Protostars (North)	0.077 $^{\circ }$ (0.08 $^{\circ }$ )0.042 $^{\circ }$	0.086 $^{\circ }$ (0.09 $^{\circ }$ )0.050 $^{\circ }$	0.095 $^{\circ }$ (0.10 $^{\circ }$ )0.058 $^{\circ }$	0.12 $^{\circ }$ (0.11 $^{\circ }$ )0.08 $^{\circ }$	0.16 $^{\circ }$ (0.12 $^{\circ }$ )0.14 $^{\circ }$
Protostars with flow (North)	0.059 $^{\circ }$ (0.06 $^{\circ }$ )0.035 $^{\circ }$	0.068 $^{\circ }$ (0.06 $^{\circ }$ )0.048 $^{\circ }$	0.075 $^{\circ }$ (0.07 $^{\circ }$ )0.058 $^{\circ }$	0.10 $^{\circ }$ (0.08 $^{\circ }$ )0.11 $^{\circ }$	0.14 $^{\circ }$ (0.10 $^{\circ }$ )0.14 $^{\circ }$
Protostars no flow (North)	0.083 $^{\circ }$ (0.09 $^{\circ }$ )0.047 $^{\circ }$	0.093 $^{\circ }$ (0.10 $^{\circ }$ )0.051 $^{\circ }$	0.103 $^{\circ }$ (0.11 $^{\circ }$ )0.059 $^{\circ }$	0.12 $^{\circ }$ (0.12 $^{\circ }$ )0.08 $^{\circ }$	0.17 $^{\circ }$ (0.13 $^{\circ }$ )0.13 $^{\circ }$
All Protostars (South)	0.096 $^{\circ }$ (0.10 $^{\circ }$ )0.075 $^{\circ }$	0.107 $^{\circ }$ (0.10 $^{\circ }$ )0.094 $^{\circ }$	0.115 $^{\circ }$ (0.10 $^{\circ }$ )0.101 $^{\circ }$	0.14 $^{\circ }$ (0.11 $^{\circ }$ )0.12 $^{\circ }$	0.23 $^{\circ }$ (0.11 $^{\circ }$ )0.21 $^{\circ }$
Protostars with flow (South)	0.094 $^{\circ }$ (0.06 $^{\circ }$ )0.093 $^{\circ }$	0.110 $^{\circ }$ (0.06 $^{\circ }$ )0.120 $^{\circ }$	0.119 $^{\circ }$ (0.06 $^{\circ }$ )0.137 $^{\circ }$	0.16 $^{\circ }$ (0.07 $^{\circ }$ )0.18 $^{\circ }$	0.24 $^{\circ }$ (0.06 $^{\circ }$ )0.23 $^{\circ }$
Protostars no flow (South)	0.097 $^{\circ }$ (0.11 $^{\circ }$ )0.073 $^{\circ }$	0.106 $^{\circ }$ (0.11 $^{\circ }$ )0.079 $^{\circ }$	0.114 $^{\circ }$ (0.11 $^{\circ }$ )0.083 $^{\circ }$	0.14 $^{\circ }$ (0.12 $^{\circ }$ )0.11 $^{\circ }$	0.23 $^{\circ }$ (0.12 $^{\circ }$ )0.19 $^{\circ }$

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