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Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy (2016)
Journal Article
Collinson, J. S., Ward, M. J., Landt, H., Done, C., Elvis, M., & McDowell, J. C. (2017). Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy. Monthly Notices of the Royal Astronomical Society, 465(1), 358-382. https://doi.org/10.1093/mnras/stw2666

We continue our study of the spectral energy distributions (SEDs) of 11 active galactic nuclei (AGN) at 1.5 < z < 2.2, with optical–near-infrared (NIR) spectra, X-ray data and mid-IR photometry. In a previous paper, we presented the observations and... Read More about Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy.

On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342 (2016)
Journal Article
Landt, H., Ward, M. J., Baloković, M., Kynoch, D., Storchi-Bergmann, T., Boisson, C., Done, C., Schimoia, J., & Stern, D. (2017). On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342. Monthly Notices of the Royal Astronomical Society, 464(3), 2565-2576. https://doi.org/10.1093/mnras/stw2447

Narrow-line Seyfert 1 galaxies have been identified by the Fermi Gamma-Ray Space Telescope as a rare class of γ-ray emitting active galactic nuclei. The lowest redshift candidate among them is the source 1H 0323+342. Here we present quasi-simultaneou... Read More about On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342.

Testing the completeness of the SDSS colour selection for ultramassive, slowly spinning black holes (2016)
Journal Article
Bertemes, C., Trakhtenbrot, B., Schawinski, K., Done, C., & Elvis, M. (2016). Testing the completeness of the SDSS colour selection for ultramassive, slowly spinning black holes. Monthly Notices of the Royal Astronomical Society, 463(4), 4041-4051. https://doi.org/10.1093/mnras/stw2207

We investigate the sensitivity of the colour-based quasar selection algorithm of the Sloan Digital Sky Survey (SDSS) to several key physical parameters of supermassive black holes (SMBHs), focusing on BH spin (a*) at the high BH-mass regime (MBH ≥ 10... Read More about Testing the completeness of the SDSS colour selection for ultramassive, slowly spinning black holes.

A disc wind interpretation of the strong Fe K$\alpha$ features in 1H 0707-495 (2016)
Journal Article
Hagino, K., Odaka, H., Done, C., Tomaru, R., Watanabe, S., & Takahashi, T. (2016). A disc wind interpretation of the strong Fe K$\alpha$ features in 1H 0707-495. Monthly Notices of the Royal Astronomical Society, 461(1), 3954-3963. https://doi.org/10.1093/mnras/stw1579

1H 0707−495 is the most convincing example of a supermassive black hole with an X-ray spectrum being dominated by extremely smeared, relativistic reflection, with the additional requirement of strongly supersolar iron abundance. However, here we show... Read More about A disc wind interpretation of the strong Fe K$\alpha$ features in 1H 0707-495.

An optically thick disk wind in GRO J1655-40? (2016)
Journal Article
Shidatsu, M., Done, C., & Ueda, Y. (2016). An optically thick disk wind in GRO J1655-40?. Astrophysical Journal, 823(2), Article 159. https://doi.org/10.3847/0004-637x/823/2/159

We revisited the unusual wind in GRO J1655−40, detected with Chandra in 2005 April, using long-term Rossi X-ray Timing Explorer X-ray data and simultaneous optical/near-infrared photometric data. This wind is the most convincing case for magnetic dri... Read More about An optically thick disk wind in GRO J1655-40?.

The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-1 (2016)
Journal Article
Luangtip, W., Roberts, T., & Done, C. (2016). The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-1. Monthly Notices of the Royal Astronomical Society, 460(4), 4417-4432. https://doi.org/10.1093/mnras/stw1282

We present a new analysis of X-ray spectra of the archetypal ultraluminous X-ray source (ULX) Holmberg IX X-1 obtained by the Swift, XMM–Newton and NuSTAR observatories. This ULX is a persistent source, with a typical luminosity of ∼1040 erg s−1, tha... Read More about The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-1.

A quasi-periodic modulation of the iron line centroid energy in the black hole binary H1743-322 (2016)
Journal Article
Ingram, A., van der Klis, M., Middleton, M., Done, C., Altamirano, D., Heil, L., …Axelsson, M. (2016). A quasi-periodic modulation of the iron line centroid energy in the black hole binary H1743-322. Monthly Notices of the Royal Astronomical Society, 461(2), 1967-1980. https://doi.org/10.1093/mnras/stw1245

Accreting stellar-mass black holes often show a ‘Type-C’ quasi-periodic oscillation (QPO) in their X-ray flux and an iron emission line in their X-ray spectrum. The iron line is generated through continuum photons reflecting off the accretion disc, a... Read More about A quasi-periodic modulation of the iron line centroid energy in the black hole binary H1743-322.

The mass and spin of the extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and its implications for the trigger for relativistic jets (2016)
Journal Article
Done, C., & Jin, C. (2016). The mass and spin of the extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and its implications for the trigger for relativistic jets. Monthly Notices of the Royal Astronomical Society, 460(2), 1716-1724. https://doi.org/10.1093/mnras/stw1070

Relativistic reflection models of the X-ray spectrum of the ‘complex’ Narrow Line Seyfert 1 (NLS1) 1H 0707−495 require a high-spin, moderate-inclination, low-mass black hole. With these parameters fixed, the observed optical/UV emission directly dete... Read More about The mass and spin of the extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and its implications for the trigger for relativistic jets.