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The NuSTAR View of the Seyfert 2 Galaxy NGC 4388

Kamraj, N. and Rivers, E. and Harrison, F. A. and Brightman, M. and Baloković, M. (2017) The NuSTAR View of the Seyfert 2 Galaxy NGC 4388. Astrophysical Journal, 843 (2). Art. No. 89. ISSN 0004-637X. doi:10.3847/1538-4357/aa7563.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kamraj, N.0000-0002-3233-2451
Harrison, F. A.0000-0003-2992-8024
Brightman, M.0000-0002-8147-2602
Baloković, M.0000-0003-0476-6647
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.
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
NASA Earth and Space Science FellowshipNNX14AQ07H
Subject Keywords:galaxies: active; galaxies: individual (NGC 4388) ; galaxies: Seyfert; X-rays: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20170526-095619685
Persistent URL:
Official Citation:N. Kamraj et al 2017 ApJ 843 89
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77806
Deposited By: Joy Painter
Deposited On:26 May 2017 17:09
Last Modified:15 Nov 2021 17:34

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