@article {2000ApJ...545L..81O,
	title = {{Chandra Observations of the X-Ray Narrow-Line Region in NGC 4151}},
	journal = {\apjl},
	volume = {545},
	year = {2000},
	note = {n/a},
	month = {dec},
	pages = {L81-L84},
	abstract = {{We present the first high-resolution X-ray spectrum of the Seyfert 1.5 galaxy NGC 4151. Observations with the Chandra High-Energy Transmission Grating Spectrometer reveal a spectrum dominated by narrow emission lines from a spatially resolved (1.6 kpc), highly ionized nebula. The X-ray narrow-line region is composite, consisting of both photoionized and collisionally ionized components. The X-ray emission lines have similar velocities, widths, and spatial extent to the optical emission lines, showing that they arise in the same region. The clouds in the narrow-line region must contain a large range of ionization states in order to explain both the optical and X-ray photoionized emission. Chandra data give the first direct evidence of X-ray line emission from a hot plasma (T\~{}10$^{7}$ K) that may provide pressure confinement for the cooler (T=3{\times}10$^{4}$ K) photoionized clouds. }
},
	doi = {10.1086/317890},
	author = {{Ogle}, P.~M. and {Marshall}, H.~L. and {Lee}, J.~C. and {Canizares}, C.~R.}
}
