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The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei

García-Bernete, I. and Ramos Almeida, C. and Landt, H. and Ward, M. J. and Baloković, M. and Acosta-Pulido, J. A. (2017) The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 469 (1). pp. 110-126. ISSN 0035-8711. doi:10.1093/mnras/stx795.

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We use new X-ray data obtained with the Nuclear Spectroscopic Telescope Array (NuSTAR), near-infrared (NIR) fluxes and mid-infrared (MIR) spectra of a sample of 24 unobscured type 1 active galactic nuclei (AGN) to study the correlation between various hard X-ray bands between 3 and 80 keV and the infrared (IR) emission. The IR to X-ray correlation spectrum (IRXCS) shows a maximum at ∼15–20 μm, coincident with the peak of the AGN contribution to the MIR spectra of the majority of the sample. There is also an NIR correlation peak at ∼2 μm, which we associate with the NIR bump observed in some type 1 AGN at ∼1–5 μm and is likely produced by nuclear hot dust emission. The IRXCS shows practically the same behaviour in all the X-ray bands considered, indicating a common origin for all of them. We finally evaluated correlations between the X-ray luminosities and various MIR emission lines. All the lines show a good correlation with the hard X-rays (ρ ≥ 0.7), but we do not find the expected correlation between their ionization potentials and the strength of the IRXCS.

Item Type:Article
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URLURL TypeDescription Paper
Baloković, M.0000-0003-0476-6647
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 28. Received 2017 March 28; in original form 2017 January 26. Published: 01 April 2017. IGB acknowledges financial support from the Instituto de Astrofísica de Canarias through Fundación La Caixa. IGB also acknowledges the Durham University for their hospitality during his stay in 2015 March and April when this project was started. CRA acknowledges the Ramón y Cajal Program of the Spanish Ministry of Economy and Competitiveness through project RYC-2014-15779 and also the Plan Nacional project AYA2016-76682-C3-2-P. MB acknowledges support from NASA Headquarters under the NASA Earth and Space Science Fellowship Program, grant NNX14AQ07H. We finally acknowledge useful comments from the anonymous referee.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Fundación La CaixaUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)RYC-2014-15779
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2016-76682-C3-2-P
NASA Earth and Space Science FellowshipNNX14AQ07H
Subject Keywords:galaxies: active – galaxies: nuclei – infrared: galaxies –X-rays: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20170331-105830442
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Official Citation:I. García-Bernete, C. Ramos Almeida, H. Landt, M. J. Ward, M. Baloković, J. A. Acosta-Pulido; The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei. Mon Not R Astron Soc 2017; 469 (1): 110-126. doi: 10.1093/mnras/stx795
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75587
Deposited By: Joy Painter
Deposited On:31 Mar 2017 18:09
Last Modified:15 Nov 2021 16:34

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