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A highly accreting low-mass black hole hidden in the dust: Suzaku and NuSTAR observations of the NLS1 Mrk 1239

Jiang, Jiachen and Baloković, Mislav and Brightman, Murray and Liu, Honghui and Harrison, Fiona A. and Lansbury, George B. (2021) A highly accreting low-mass black hole hidden in the dust: Suzaku and NuSTAR observations of the NLS1 Mrk 1239. Monthly Notices of the Royal Astronomical Society, 505 (1). pp. 702-712. ISSN 0035-8711. doi:10.1093/mnras/stab1306.

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We present torus modelling for the X-ray spectra of a nearby narrow-line Seyfert 1 galaxy Mrk 1239 (z = 0.0199), based on archival Suzaku, NuSTAR, and Swift observations. Our model suggests very soft intrinsic power-law continuum emission of Γ ≈ 2.57 in 2019 and Γ ≈ 2.98 in 2007. By applying a correction factor to the unabsorbed X-ray luminosity, we find that Mrk 1239 is accreting near or around the Eddington limit. Our best-fitting spectral model also suggests a torus with a column density of log (N_(H,ave)/ cm⁻²) = 25.0 ± 0.2 and a high covering factor of 0.90 in Mrk 1239, indicating that this source is most likely to be viewed almost face-on with i ≈ 26°. Our line of sight might cross the edge of the torus with N_(H,los) = 2–5 × 10²³ cm⁻². The high Eddington ratio and the high line-of-sight column density makes Mrk 1239 one of the active galactic nuclei that are close to the limit where wind may form near the edge of the torus due to high radiation pressure.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
https://heasarc.gsfc.nasa.govRelated ItemHEASARC website
Jiang, Jiachen0000-0002-9639-4352
Baloković, Mislav0000-0003-0476-6647
Brightman, Murray0000-0002-8147-2602
Liu, Honghui0000-0003-2845-1009
Harrison, Fiona A.0000-0003-2992-8024
Lansbury, George B.0000-0002-5328-9827
Additional Information:© 2021 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 ( Accepted 2021 May 4. Received 2021 April 26; in original form 2020 July 28. Published: 10 May 2021. This paper was written during the worldwide COVID-19 pandemic in 2020–2021. We acknowledge the hard work of all the health care workers around the world. We could not have finished this paper without their protection. JJ acknowledges support from the Tsinghua Shui’Mu Scholar Program and the Tsinghua Astrophysics Outstanding Fellowship. MB acknowledges support from the YCAA Prize Postdoctoral 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, and data obtained from the Suzaku satellite, a collaborative mission between the space agencies of Japan (JAXA) and the USA (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. Data Availability: All the data can be downloaded from the HEASARC website at
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
Tsinghua UniverisityUNSPECIFIED
Yale Center for Astronomy and AstrophysicsUNSPECIFIED
Subject Keywords:black hole physics – galaxies: nuclei – galaxies: Seyfert –X-ray: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20210520-150005274
Persistent URL:
Official Citation:Jiachen Jiang, Mislav Baloković, Murray Brightman, Honghui Liu, Fiona A Harrison, George B Lansbury, A highly accreting low-mass black hole hidden in the dust: Suzaku and NuSTAR observations of the NLS1 Mrk 1239, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 1, July 2021, Pages 702–712,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109222
Deposited By: George Porter
Deposited On:21 May 2021 14:16
Last Modified:10 Jun 2021 21:20

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