Published December 20, 2019 | Version Published + Accepted Version
Journal Article Open

The Broadband X-Ray Spectrum of the X-Ray-obscured Type 1 AGN 2MASX J193013.80+341049.5

Abstract

We present results from modeling the broadband X-ray spectrum of the Type 1 active galactic nucleus (AGN) 2MASX J193013.80+341049.5 using NuSTAR, Swift, and archival XMM-Newton observations. We find this source to be highly X-ray obscured, with column densities exceeding 10²³ cm⁻² across all epochs of X-ray observations, spanning an 8 yr period. However, the source exhibits prominent broad optical emission lines, consistent with an unobscured Type 1 AGN classification. We fit the X-ray spectra with both phenomenological reflection models and physically motivated torus models to model the X-ray absorption. We examine the spectral energy distribution of this source and investigate some possible scenarios to explain the mismatch between X-ray and optical classifications. We compare the ratio of reddening to X-ray absorbing column density (E_(B−V)/N_H) and find that 2MASX J193013.80+341049.5 likely has a much lower dust-to-gas ratio relative to the Galactic interstellar medium, suggesting that the broad line region itself could provide the source of extra X-ray obscuration, being composed of low-ionization, dust-free gas.

Additional Information

© 2019 The American Astronomical Society. Received 2019 September 19; revised 2019 November 4; accepted 2019 November 13; published 2019 December 26. 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.B. acknowledges support from the Black Hole Initiative at Harvard University, through a grant from the John Templeton Foundation. M.K. acknowledges support from NASA through ADAP award NNH16CT03C. D.J.W. acknowledges support from STFC in the form of an Ernest Rutherford fellowship. R.J.A was supported by FONDECYT grant No. 1191124. Facilities: NuSTAR - The NuSTAR (Nuclear Spectroscopic Telescope Array) mission, Swift - , XMM-Newton - , Palomar DBSP. - Software: NuSTARDAS (v2.14.1), HEASOFT (v6.24), XMM SAS (v16.1.0), XSPEC (v12.8.2), Astropy, SciPy, NumPy, Matplotlib.

Attached Files

Published - Kamraj_2019_ApJ_887_255.pdf

Accepted Version - 1911.05820.pdf

Files

1911.05820.pdf

Files (7.0 MB)

Name Size Download all
md5:bdb78013a9b90dc65a773a2bcf54ff2e
6.0 MB Preview Download
md5:984337bc5ab4d7a9f80a3e0dad776d8a
1.0 MB Preview Download

Additional details

Identifiers

Eprint ID
100459
Resolver ID
CaltechAUTHORS:20200102-123811313

Related works

Funding

NASA/JPL/Caltech
Harvard University
John Templeton Foundation
NASA
NNH16CT03C
Science and Technology Facilities Council (STFC)
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
1191124

Dates

Created
2020-01-02
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
NuSTAR, Space Radiation Laboratory, Astronomy Department