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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Prof. Dimitra Rigopoulou

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
Dimitra.Rigopoulou@physics.ox.ac.uk
Telephone: 01865 (2)73296
Denys Wilkinson Building, room 75419514947
  • About
  • Publications

Constraints on the active galactic nucleus and starburst activity of local ultraluminous infrared galaxies from a broad range of torus models

(2025)

Authors:

Charalambia Varnava, Andreas Efstathiou, Duncan Farrah, Dimitra Rigopoulou
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The Galaxy Activity, Torus, and Outflow Survey (GATOS). VII. The 20–214 μ m Imaging Atlas of Active Galactic Nuclei Using SOFIA

The Astrophysical Journal: Supplement Series American Astronomical Society 276:2 (2025) 64

Authors:

Lindsay Fuller, Enrique Lopez-Rodriguez, Ismael García-Bernete, Cristina Ramos Almeida, Almudena Alonso-Herrero, Chris Packham, Lulu Zhang, Mason Leist, Nancy A Levenson, Masatoshi Imanishi, Sebastian Hoenig, Marko Stalevski, Claudio Ricci, Erin Hicks, Enrica Bellocchi, Francoise Combes, Ric Davies, Santiago García Burillo, Omaira González Martín, Takuma Izumi, Alvaro Labiano, Miguel Pereira Santaella, Dimitra Rigopoulou, David Rosario

Abstract:

We present a 19.7–214 μm imaging atlas of local (4–181 Mpc; median 43 Mpc) active galactic nuclei (AGN) observed with FORCAST and HAWC+ on board the SOFIA telescope with angular resolutions ~3″–20″. This atlas comprises 22 Seyferts (17 Type 2 and five Type 1) with a total of 69 images, 41 of which have not been previously published. The AGN span a range of luminosities of log10(Lbol[ergs-1])=[42, 46] with a median of log10(Lbol[ergs−1])=44.1±1.0 . We provide the total fluxes of our sample using aperture photometry for point-source objects and a 2D Gaussian fitting for objects with extended host galaxy emission, which was used to estimate the unresolved nuclear component. Most galaxies in our sample are pointlike sources; however, four sources (Centaurus A, Circinus, NGC 1068, and NGC 4388) show extended emission in all wavelengths. The 30–40 μm extended emission in NGC 4388 is coincident with the narrow-line region at PA ~ 50°, while the dusty extension at longer wavelengths arises from the host galaxy at PA ~ 90°. Our new observations allow us to construct the best-sampled parsec-scales (spectral energy distributions, SEDs) available between 30 and 500 μm for a sample of nearby AGN. We estimate that the average peak wavelength of the nuclear SEDs is ~40 μm in νFν, which we associate with an unresolved extended dusty region heated by the AGN.
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Molecular Gas Heating, Star Formation Rate Relations, and AGN Feedback in Infrared-luminous Galaxy Mergers

(2025)

Authors:

Duncan Farrah, Andreas Efstathiou, Jose Afonso, David L Clements, Kevin Croker, Evanthia Hatziminaoglou, Maya Joyce, Vianney Lebouteiller, Alaine Lee, Carol Lonsdale, Chris Pearson, Sara Petty, Lura K Pitchford, Dimitra Rigopoulou, Aprajita Verma, Lingyu Wang
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Galaxy Activity, Torus, and Outflow Survey (GATOS). Black hole mass estimation using machine learning

Astronomy & Astrophysics EDP Sciences (2024)

Authors:

R Poitevineau, F Combes, S Garcia-Burillo, D Cornu, A Alonso Herrero, C Ramos Almeida, A Audibert, E Bellocchi, PG Boorman, AJ Bunker, R Davies, T Díaz-Santos, I García-Bernete, B García-Lorenzo, O González-Martín, EKS Hicks, SF Hönig, LK Hunt, M Imanishi, M Pereira-Santaella, C Ricci, D Rigopoulou, DJ Rosario, D Rouan, M Villar Martin, M Ward
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Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA

Astronomy & Astrophysics EDP Sciences (2024)

Authors:

D Esparza-Arredondo, C Ramos Almeida, A Audibert, M Pereira-Santaella, I García-Bernete, S García-Burillo, T Shimizu, R Davies, L Hermosa Muñoz, A Alonso-Herrero, F Combes, G Speranza, L Zhang, S Campbell, E Bellocchi, AJ Bunker, T Díaz-Santos, B García-Lorenzo, O González-Martín, EKS Hicks, A Labiano, NA Levenson, C Ricci, D Rosario, S Hoenig, C Packham, M Stalevski, L Fuller, T Izumi, E López-Rodríguez, D Rigopoulou, D Rouan, M Ward
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