All Outputs (357)

Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM (2025)
Journal Article
Suzuki, H., Tsuji, N., Kanemaru, Y., Shidatsu, M., Olivera-Nieto, L., Safi-Harb, S., Kimura, S. S., de la Fuente, E., Casanova, S., Mori, K., Wang, X., Kato, S., Tateishi, D., Uchiyama, H., Tanaka, T., Uchida, H., Inoue, S., Huang, D., Lemoine-Goumard, M., Miura, D., …Ueda, Y. (2025). Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM. Astrophysical Journal Letters, 978(2), Article L20. https://doi.org/10.3847/2041-8213/ad9d11

A recent report on the detection of very-high-energy gamma rays from V4641 Sagittarii (V4641 Sgr) up to ≈0.8 PeV has made it the second confirmed “PeVatron” microquasar. Here we report on the observation of V4641 Sgr with X-Ray Imaging and Spectrosco... Read More about Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM.

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.

HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars (2023)
Journal Article
Zappacosta, L., Piconcelli, E., Fiore, F., Saccheo, I., Valiante, R., Vignali, C., …Vanzella, E. (2023). HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars. Astronomy & Astrophysics, 678, Article A201. https://doi.org/10.1051/0004-6361/202346795

The existence of luminous quasars (QSOs) at the epoch of reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳109 M⊙ challenges models of early SMBH formation and growth. To shed light on the nature of t... Read More about HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars.

Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars (2023)
Journal Article
Ward, M., Done, C., Jin, C., Lusso, E., & Middei, R. (2024). Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars. Monthly Notices of the Royal Astronomical Society, 527(1), 356–373. https://doi.org/10.1093/mnras/stad3193

The interband correlations between optical/ultraviolet (UV) and X-ray luminosities of active galactic nuclei (AGNs) are important
for understanding the disc–coronal connection, as well as using AGN as standard candles for cosmology. It is convention... Read More about Wavelength dependences of the optical/UV and X-ray luminosity correlations of quasars.

Estimating black hole spin from AGN SED fitting: the impact of general-relativistic ray tracing (2023)
Journal Article
Hagen, S., & Done, C. (2023). Estimating black hole spin from AGN SED fitting: the impact of general-relativistic ray tracing. Monthly Notices of the Royal Astronomical Society, 525(3), 3455-3467. https://doi.org/10.1093/mnras/stad2499

Accretion disc model fitting to optical/UV quasar spectra requires that the highest mass black holes have the highest spin, with implications on the hierarchical growth of supermassive black holes and their host galaxies over cosmic time. However, th... Read More about Estimating black hole spin from AGN SED fitting: the impact of general-relativistic ray tracing.

The origin of long soft lags and the nature of the hard-intermediate state in black hole binaries (2023)
Journal Article
Kawamura, T., Done, C., & Takahashi, T. (2023). The origin of long soft lags and the nature of the hard-intermediate state in black hole binaries. Monthly Notices of the Royal Astronomical Society, 525(1), 1280-1287. https://doi.org/10.1093/mnras/stad2338

Fast variability of the X-ray corona in black hole binaries can produce a soft lag by reverberation, where the reprocessed thermalized disc photons lag behind the illuminating hard X-rays. This lag is small, and systematically decreases with increasi... Read More about The origin of long soft lags and the nature of the hard-intermediate state in black hole binaries.

The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc (2023)
Journal Article
Mitchell, J. A. J., Done, C., Ward, M. J., Kynoch, D., Hagen, S., Lusso, E., & Landt, H. (2023). The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc. Monthly Notices of the Royal Astronomical Society, 524(2), 1796-1825. https://doi.org/10.1093/mnras/stad1830

We use the SOUX sample of ∼700 active galactic nucleus (AGN) to form average optical-ultraviolet (UV)-X-rays spectral energy distributions (SEDs) on a two-dimensional (2D) grid of MBH and L2500. We compare these with the predictions of a new AGN SED... Read More about The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc.

A different view of wind in X-ray binaries: the accretion disc corona source 2S 0921-630 (2023)
Journal Article
Tomaru, R., Done, C., Odaka, H., & Tanimoto, A. (2023). A different view of wind in X-ray binaries: the accretion disc corona source 2S 0921-630. Monthly Notices of the Royal Astronomical Society, 523(3), 3441-3449. https://doi.org/10.1093/mnras/stad1637

Accretion disc coronae (ADC) sources are very high inclination neutron star or black hole binaries, where the outer accretion flow blocks a direct view of the central source. The weak observed X-ray emission is instead produced mainly by scattering o... Read More about A different view of wind in X-ray binaries: the accretion disc corona source 2S 0921-630.

Tracking the spectral properties of ESO 511-G030 across different epochs (2023)
Journal Article
Middei, R., Petrucci, P., Bianchi, S., Ursini, F., Matzeu, G. A., Vagnetti, F., …Done, C. (2023). Tracking the spectral properties of ESO 511-G030 across different epochs. Astronomy & Astrophysics, 672, 1-17. https://doi.org/10.1051/0004-6361/202244022

The Type 1 active galactic nucleus (AGN) ESO 511-G030, a formerly bright and soft excess dominated source, was observed in 2019 in the context of a multi-wavelength monitoring campaign. In the new exposures, the source was found to be in a flux state... Read More about Tracking the spectral properties of ESO 511-G030 across different epochs.

Modelling continuum reverberation in active galactic nuclei: a spectral-timing analysis of the ultraviolet variability through X-ray reverberation in Fairall 9 (2023)
Journal Article
Hagen, S., & Done, C. (2023). Modelling continuum reverberation in active galactic nuclei: a spectral-timing analysis of the ultraviolet variability through X-ray reverberation in Fairall 9. Monthly Notices of the Royal Astronomical Society, 521(1), 251-268. https://doi.org/10.1093/mnras/stad504

Continuum reverberation mapping of active galactic nuclei (AGNs) can provide new insight into the nature and geometry of the accretion flow. Some of the X-rays from the central corona irradiating the disc are absorbed, increasing the local disc tempe... Read More about Modelling continuum reverberation in active galactic nuclei: a spectral-timing analysis of the ultraviolet variability through X-ray reverberation in Fairall 9.

The SOUX AGN sample: SDSS–XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition (2023)
Journal Article
Kynoch, D., Mitchell, J. A. J., Ward, M. J., Done, C., Lusso, E., & Landt, H. (2023). The SOUX AGN sample: SDSS–XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition. Monthly Notices of the Royal Astronomical Society, 520(2), 2781-2805. https://doi.org/10.1093/mnras/stad221

We assemble a sample of 696 type 1 active galactic nuclei (AGN) up to a redshift of z = 2.5, all of which have an SDSS spectrum containing at least one broad emission line (H α, H β, or Mg II) and an XMM-Newton X-ray spectrum containing at least 250... Read More about The SOUX AGN sample: SDSS–XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition.