The NuSTAR View of the Seyfert 2 Galaxy NGC 4388

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 K line and Compton reflection hump, enables tight constraints to be placed on reflection features in AGN X-ray spectra...

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Bibliographic Details
Published in:The Astrophysical journal 2017-07, Vol.843 (2), p.89
Main Authors: Kamraj, N., Rivers, E., Harrison, F. A., Brightman, M., Balokovi, M.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Broadband
Galaxies
galaxies: active
galaxies: individual (NGC 4388)
galaxies: Seyfert
Iron
K alpha line
KEV RANGE
Power law
REFLECTION
RELATIVISTIC RANGE
SENSITIVITY
SEYFERT GALAXIES
Stars & galaxies
Toruses
X ray reflection
X ray spectra
X-RAY GALAXIES
X-rays: galaxies
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Summary: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 K 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 (NH = (6.5 0.8) × 1023 cm−2) with a very weak Compton reflection hump (R < 0.09) and an exceptionally large Fe K line eV) for a source with weak or no reflection. Calculations using a thin-shell approximation for the expected Fe K EW indicate that an Fe K line originating from Compton-thin material presents a possible explanation.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa7563