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The awakening beast in the Seyfert 1 Galaxy KUG 1141+371 – I

Jiang, Jiachen and Cheng, Huaqing and Gallo, Luigi C. and Ho, Luis C. and Buisson, Douglas J. K. and Fabian, Andrew C. and Harrison, Fiona A. and Parker, Michael L. and Reynolds, Christopher S. and Steiner, James F. and Tomsick, John A. and Walton, Dominic J. and Yuan, Weimin (2021) The awakening beast in the Seyfert 1 Galaxy KUG 1141+371 – I. Monthly Notices of the Royal Astronomical Society, 501 (1). pp. 916-932. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20210201-134244580

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Abstract

KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous flux increase in the optical and UV bands in the past decade. For instance, the latest Swift observation in 2019 shows that the UVW2 flux of the active galactic nucleus in KUG 1141+371 has increased by over one order of magnitude since 2009. Meanwhile, the soft X-ray flux of KUG 1141+371 also shows a steady increase by one order of magnitude since 2007. The significant multiwavelength luminosity change is likely due to a boost of mass accretion rate from approximately 0.6 per cent of the Eddington limit to 3.2 per cent⁠, assuming a black hole mass of 10⁸ M⊙. In this work, we conduct detailed multi-epoch X-ray spectral analysis focusing on the variability of the X-ray continuum emission and the puzzling soft excess emission. In addition, our SED models also suggest a simultaneous increase of disc temperature and a decreasing inner disc radius along with the increasing accretion rate. Finally, we discuss possible connection between KUG 1141+371 and black hole transients in outburst.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/staa3737DOIArticle
https://arxiv.org/abs/2011.14254arXivDiscussion Paper
https://heasarc.gsfc.nasa.govRelated ItemHigh Energy Astrophysics Science Archive Research Center (HEASARC)
ORCID:
AuthorORCID
Jiang, Jiachen0000-0002-9639-4352
Cheng, Huaqing0000-0003-4200-9954
Ho, Luis C.0000-0001-6947-5846
Fabian, Andrew C.0000-0002-9378-4072
Harrison, Fiona A.0000-0003-2992-8024
Parker, Michael L.0000-0002-8466-7317
Steiner, James F.0000-0002-5872-6061
Tomsick, John A.0000-0001-5506-9855
Walton, Dominic J.0000-0001-5819-3552
Additional Information:© 2020 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2020 November 27. Received 2020 November 8; in original form 2020 March 6. Published: 03 December 2020. This paper was written during the outbreak of COVID-19 in China in 2020. We would like to acknowledge the doctors and nurses who have been working day and night to ensure the safety of Chinese people during this period. JJ acknowledges support from the Tsinghua Astrophysics Outstanding Fellowship and the Tsinghua Shuimu Scholar Program. LCH acknowledges support from National Science Foundation of China (11721303, 11991052) and National Key Research and Development Program of China (2016YFA0400702). DJKB acknowledges support from Royal Society. ACF acknowledges support from ERC Advanced Grant (340442). CSR thanks the UK Science and Technology Facilities Council for support under the New Applicant grant ST/R000867/1, and the European Research Council for support under the European Union’s Horizon 2020 research and innovation programme (834203). MLP is supported by European Space Agency Research Fellowships. DJW acknowledges support from an STFC Ernest Rutherford Fellowship. This work 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 NASA. This research has made use of the NuSTAR Data Analysis Software (NUSTARDAS) jointly developed by the ASI Science Data Center and the California Institute of Technology. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. This project was also based on observations obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. This project has made use of the Science Analysis Software (SAS), an extensive suite to process the data collected by the XMM–Newton observatory. HQ acknowledges support from National Natural Science Foundation of China (11803047). Data Availability: The data underlying this article are available in the High Energy Astrophysics Science Archive Research Center (HEASARC), at https://heasarc.gsfc.nasa.gov.
Group:Astronomy Department, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
Tsinghua UniversityUNSPECIFIED
National Natural Science Foundation of China11721303
National Natural Science Foundation of China11991052
National Key Research and Development Program of China2016YFA0400702
Royal SocietyUNSPECIFIED
European Research Council (ERC)340442
Science and Technology Facilities Council (STFC)ST/R000867/1
European Research Council (ERC)834203
European Space Agency (ESA)UNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
National Natural Science Foundation of China11803047
Subject Keywords:accretion, accretion discs – black hole physics – galaxies: Seyfert –X-rays: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20210201-134244580
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210201-134244580
Official Citation:Jiachen Jiang, Huaqing Cheng, Luigi C Gallo, Luis C Ho, Douglas J K Buisson, Andrew C Fabian, Fiona A Harrison, Michael L Parker, Christopher S Reynolds, James F Steiner, John A Tomsick, Dominic J Walton, Weimin Yuan, The awakening beast in the Seyfert 1 Galaxy KUG 1141+371 – I, Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 1, February 2021, Pages 916–932, https://doi.org/10.1093/mnras/staa3737
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107839
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Feb 2021 22:00
Last Modified:10 Mar 2021 19:58

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