Showing papers by "Chris Benn published in 2011"
Virginia Tech1, Georgia Regents University2, University of Colorado Boulder3, Space Telescope Science Institute4, Johns Hopkins University5, Western Michigan University6, Netherlands Institute for Space Research7, University of Oxford8, Catholic University of the North9, Spanish National Research Council10, National Institutes of Natural Sciences, Japan11, Technion – Israel Institute of Technology12, Georgia State University13, University of Wisconsin-Madison14, Creighton University15, Harvard University16, Towson University17
TL;DR: In this paper, absorption line analysis of the outflow in the quasar IRAS F04250-5718 is presented, which reveals intrinsic narrow absorption lines from high ionization ion (e.g., C IV, N V, and O VI) as well as low ionization ions (i.e., C II and Si III).
Abstract: We present absorption line analysis of the outflow in the quasar IRAS F04250–5718. Far-ultraviolet data from the Cosmic Origins Spectrograph on board the Hubble Space Telescope reveal intrinsic narrow absorption lines from high ionization ions (e.g., C IV, N V, and O VI) as well as low ionization ions (e.g., C II and Si III). We identify three kinematic components with central velocities ranging from ~–50 to ~–230 km s–1. Velocity-dependent, non-black saturation is evident from the line profiles of the high ionization ions. From the non-detection of absorption from a metastable level of C II, we are able to determine that the electron number density in the main component of the outflow is 30 cm–3. Photoionization analysis yields an ionization parameter log U H ~ –1.6 ± 0.2, which accounts for changes in the metallicity of the outflow and the shape of the incident spectrum. We also consider solutions with two ionization parameters. If the ionization structure of the outflow is due to photoionization by the active galactic nucleus, we determine that the distance to this component from the central source is 3 kpc. Due to the large distance determined for the main kinematic component, we discuss the possibility that this outflow is part of a galactic wind.
46 citations
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TL;DR: In this paper, the authors present absorption line analysis of the outflow in the quasar IRAS F04250-5718 and identify three kinematic components with central velocities ranging from ~-50 to ~-230 km/s.
Abstract: We present absorption line analysis of the outflow in the quasar IRAS F04250-5718. Far-ultraviolet data from the Cosmic Origins Spectrograph onboard the Hubble Space Telescope reveal intrinsic narrow absorption lines from high ionization ions (e.g., C IV, N V, and O VI) as well as low ionization ions (e.g., C II and Si III). We identify three kinematic components with central velocities ranging from ~-50 to ~-230 km/s. Velocity dependent, non-black saturation is evident from the line profiles of the high ionization ions. From the non-detection of absorption from a metastable level of C II, we are able to determine that the electron number density in the main component of the outflow is 3 kpc. Due to the large distance determined for the main kinematic component, we discuss the possibility that this outflow is part of a galactic wind.
1 citations