The NuSTAR View of the Seyfert 2 Galaxy NGC 4388
Abstract
We present an analysis of NuSTAR X-ray observations in the 3–79 keV energy band of the Seyfert 2 galaxy NGC 4388, taken in 2013. The broadband sensitivity of NuSTAR, covering the Fe Kα line and Compton reflection hump, enables tight constraints to be placed on reflection features in AGN X-ray spectra, thereby providing insight into the geometry of the circumnuclear material. In this observation, we found the X-ray spectrum of NGC 4388 to be well described by a moderately absorbed power law with non-relativistic reflection. We fit the spectrum with phenomenological reflection models and a physical torus model and find the source to be absorbed by Compton-thin material (N_H = (6.5 ± 0.8) × 10^(23) cm^(−2)) with a very weak Compton reflection hump (R < 0.09) and an exceptionally large Fe Kα line (EW = 368^(+56)_(-53) eV) for a source with weak or no reflection. Calculations using a thin-shell approximation for the expected Fe Kα EW indicate that an Fe Kα line originating from Compton-thin material presents a possible explanation.
Additional Information
© 2017 The American Astronomical Society. Received 2017 April 22; Accepted 2017 May 25; Published 2017 July 6. We have made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). M. Baloković acknowledges support from NASA Headquarters under the NASA Earth and Space Science Fellowship Program, grant NNX14AQ07H. Facility: NuSTAR.Attached Files
Published - Kamraj_2017_ApJ_843_89.pdf
Submitted - 1705.09260.pdf
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Additional details
- Eprint ID
- 77806
- Resolver ID
- CaltechAUTHORS:20170526-095619685
- NASA/JPL/Caltech
- NASA Earth and Space Science Fellowship
- NNX14AQ07H
- Created
-
2017-05-26Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory, NuSTAR, Astronomy Department