Outputs (356)

Detection of the Orbital Modulation of Fe K α Fluorescence Emission in Centaurus X-3 Using the High-resolution Spectrometer Resolve on board XRISM (2024)
Journal Article
Mochizuki, Y., Tsujimoto, M., Kelley, R. L., Vander Meulen, B., Enoto, T., Nagai, Y., Done, C., Pradhan, P., Hell, N., Pottschmidt, K., Ebisawa, K., & Behar, E. (2024). Detection of the Orbital Modulation of Fe K α Fluorescence Emission in Centaurus X-3 Using the High-resolution Spectrometer Resolve on board XRISM. Astrophysical Journal Letters, 977(1), Article L21. https://doi.org/10.3847/2041-8213/ad946d

The Fe Kα fluorescence line emission in X-ray spectra is a powerful diagnostic tool for various astrophysical objects to reveal the distribution of cold matter around photoionizing sources. The advent of the X-ray microcalorimeter on board the XRISM... Read More about Detection of the Orbital Modulation of Fe K α Fluorescence Emission in Centaurus X-3 Using the High-resolution Spectrometer Resolve on board XRISM.

Making the Invisible Visible: Magnetic Fields in Accretion Flows Revealed by X-Ray Polarization (2024)
Journal Article
Barnier, S., & Done, C. (2024). Making the Invisible Visible: Magnetic Fields in Accretion Flows Revealed by X-Ray Polarization. The Astrophysical Journal, 977(2), 201. https://doi.org/10.3847/1538-4357/ad9277

Large-scale, strong magnetic fields are often evoked in black hole accretion flows, for jet launching in the low/hard state and to circumvent the thermal instability in the high/soft state. Here, we show how these ideas are strongly challenged by X-r... Read More about Making the Invisible Visible: Magnetic Fields in Accretion Flows Revealed by X-Ray Polarization.

A second view on the X-ray polarization of NGC 4151 with IXPE (2024)
Journal Article
Gianolli, V. E., Bianchi, S., Kammoun, E., Gnarini, A., Marinucci, A., Ursini, F., Parra, M., Tortosa, A., De Rosa, A., Kim, D. E., Marin, F., Matt, G., Serafinelli, R., Soffitta, P., Tagliacozzo, D., Di Gesu, L., Done, C., Marshall, H. L., Middei, R., Mikusincova, R., …Tombesi, F. (2024). A second view on the X-ray polarization of NGC 4151 with IXPE. Astronomy & Astrophysics, 691, Article A29. https://doi.org/10.1051/0004-6361/202451645

We report on the second observing program of the active galactic nucleus NGC 4151 with simultaneous Imaging X-ray Polarimetry Explorer (IXPE; 750 ks), NuSTAR (∼60 ks), XMM-Newton (∼75 ks), and NICER (∼65 ks) pointings. NGC 4151 is the first Type-1 ra... Read More about A second view on the X-ray polarization of NGC 4151 with IXPE.

Systematic collapse of the accretion disc across the supermassive black hole population (2024)
Journal Article
Hagen, S., Done, C., Silverman, J. D., Li, J., Liu, T., Ren, W., Buchner, J., Merloni, A., Nagao, T., & Salvato, M. (2024). Systematic collapse of the accretion disc across the supermassive black hole population. Monthly Notices of the Royal Astronomical Society, 534(3), 2803-2818. https://doi.org/10.1093/mnras/stae2272

The structure of the accretion flow on to supermassive black holes is not well understood. Standard disc models match to zeroth-order in predicting substantial energy dissipation within optically thick material producing a characteristic strong blue/... Read More about Systematic collapse of the accretion disc across the supermassive black hole population.

Common origin for black holes in both high mass X-ray binaries and gravitational-wave sources (2024)
Journal Article
Belczynski, K., Done, C., Hagen, S., Lasota, J.-P., & Sen, K. (2024). Common origin for black holes in both high mass X-ray binaries and gravitational-wave sources. Astronomy & Astrophysics, 690, Article A21. https://doi.org/10.1051/0004-6361/202450229

Black-hole (BH) high-mass X-ray binary (HMXB) systems are likely to be the progenitors of BH-BH mergers detected in gravitational waves by LIGO/Virgo/KAGRA (LVK). Yet merging BHs reach higher masses (∼100 M⊙) than BHs in HMXBs (∼20 M⊙) and typically... Read More about Common origin for black holes in both high mass X-ray binaries and gravitational-wave sources.

What drives the variability in AGN? Explaining the UV-Xray disconnect through propagating fluctuations (2024)
Journal Article
Hagen, S., Done, C., & Edelson, R. (2024). What drives the variability in AGN? Explaining the UV-Xray disconnect through propagating fluctuations. Monthly Notices of the Royal Astronomical Society, 530(4), 4850-4867. https://doi.org/10.1093/mnras/stae1177

Intensive broad-band reverberation mapping campaigns have shown that AGN variability is significantly more complex than expected from disc reverberation of the variable X-ray illumination. The UV/optical variability is highly correlated and lagged, w... Read More about What drives the variability in AGN? Explaining the UV-Xray disconnect through propagating fluctuations.

The Peculiar Bursting Nature of CP Pup (2024)
Journal Article
Veresvarska, M., Scaringi, S., Hagen, S., De Martino, D., Done, C., Ilkiewicz, K., …Littlefield, C. (2024). The Peculiar Bursting Nature of CP Pup. Monthly Notices of the Royal Astronomical Society, 529(1), 664-672. https://doi.org/10.1093/mnras/stae573

The classical nova CP Puppis has been observed to have particularly puzzling and peculiar properties. In particular, this classical nova displays occasional bursts in its long-term ASAS-SN light curve. Here, we report on five sectors of TESS data dis... Read More about The Peculiar Bursting Nature of CP Pup.

Disc corona radii and QPO frequencies in black hole binaries: testing Lense– Thirring precession origin (2024)
Journal Article
Kubota, A., Done, C., Tsurumi, K., & Mizukawa, R. (2024). Disc corona radii and QPO frequencies in black hole binaries: testing Lense– Thirring precession origin. Monthly Notices of the Royal Astronomical Society, 528(2), 1668-1684. https://doi.org/10.1093/mnras/stae067

Stellar-mass black hole binary systems in the luminous X-ray states show a strong quasi-periodic oscillation (QPO) in their Comptonized emission. The frequency of this feature correlates with the ratio of a disc to Comptonized emission rather than wi... Read More about Disc corona radii and QPO frequencies in black hole binaries: testing Lense– Thirring precession origin.

Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: A moderate changing-state AGN? (2024)
Journal Article
Porquet, D., Hagen, S., Grosso, N., Lobban, A., Reeves, J. N., Braito, V., & Done, C. (2024). Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: A moderate changing-state AGN?. Astronomy & Astrophysics, 681, Article A40. https://doi.org/10.1051/0004-6361/202347202

Context. The X-ray broadband spectra of the bare active galactic nucleus (AGN) Mrk 110, obtained by simultaneous XMM-Newton and NuSTAR observations performed in November 2019 and April 2020, are characterised by the presence of a prominent and absorp... Read More about Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: A moderate changing-state AGN?.

X-ray polarization properties of thermal-radiative disc winds in binary systems (2023)
Journal Article
Tomaru, R., Done, C., & Odaka, H. (2024). X-ray polarization properties of thermal-radiative disc winds in binary systems. Monthly Notices of the Royal Astronomical Society, 527(3), 7047–7054. https://doi.org/10.1093/mnras/stad3649

New X-ray polarization results are challenging our understanding of the accretion flow geometry in black hole binary systems. Even spectra dominated by a standard disc can give unexpected results, such as the high-inclination black hole binary 4U 163... Read More about X-ray polarization properties of thermal-radiative disc winds in binary systems.