Scott Hagen's Outputs (7)

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.

An Eddington-limited Accretion Disk Wind in the Narrow-line Seyfert 1 PG 1448+273 (2024)
Journal Article
Reeves, J. N., Braito, V., Luminari, A., Porquet, D., Laurenti, M., Matzeu, G., Lobban, A., & Hagen, S. (2024). An Eddington-limited Accretion Disk Wind in the Narrow-line Seyfert 1 PG 1448+273. The Astrophysical Journal, 974(1), Article 58. https://doi.org/10.3847/1538-4357/ad6b95

PG 1448+273 is a luminous, nearby (z = 0.0645), narrow-line Seyfert 1 galaxy, which likely accretes close to the Eddington limit. Previous X-ray observations of PG 1448+273 with XMM-Newton in 2017 and NuSTAR in 2022 revealed the presence of an ultraf... Read More about An Eddington-limited Accretion Disk Wind in the Narrow-line Seyfert 1 PG 1448+273.

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.

Revealing the burning and soft heart of the bright bare active galactic nucleus ESO 141-G55: X-ray broadband and SED analysis (2024)
Journal Article
Porquet, D., Reeves, J. N., Hagen, S., Lobban, A., Braito, V., Grosso, N., & Marin, F. (2024). Revealing the burning and soft heart of the bright bare active galactic nucleus ESO 141-G55: X-ray broadband and SED analysis. Astronomy & Astrophysics, 689, Article A336. https://doi.org/10.1051/0004-6361/202449708

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.

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?.