The Nuclear X-Ray Emission-line Structure in NGC 2992 Revealed by
Author(s)Murphy, K. D.; Marshall, Herman; Nowak, Michael A.
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We present the narrow emission-line structure revealed by a 135 ks Chandra observation of Seyfert galaxy NGC 2992, using the High Energy Transmission Grating Spectrometer. The source was observed in an historically low-flux state. Using a Bayesian Block search technique, we detected neutral Si Kα and S Kα fluorescence and two additional lines that are consistent with redshifted, ionized Si emission. The latter two features are indicative of a photoionized outflow with a velocity of ∼ 2500 km s⁻¹. We also observed prominent, unresolved line emission at the rest energy of Fe Kα, with a 90% confidence FWHM velocity width of < 2000 km s⁻¹ ( < 2800 km s⁻¹) and equivalent width of 406-1148 eV (288-858 eV) when broad Fe Kα line emission, as detected by Suzaku, was (was not) included in the model.
DepartmentMIT Kavli Institute for Astrophysics and Space Research
Murphy, K. D. et al. “The Nuclear X-Ray Emission-Line Structure in NGC 2992 Revealed by Chandra-HETGS.” The Astrophysical Journal 840, 2 (May 2017): 120 © 2017 The American Astronomical Society
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