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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

ALMA [N ii] 205 μm Imaging Spectroscopy of the Lensed Submillimeter Galaxy ID 141 at Redshift 4.24

The Astrophysical Journal American Astronomical Society 898:1 (2020) 33

Authors:

Cheng Cheng, Xiaoyue Cao, Nanyao Lu, Ran Li, Chentao Yang, Dimitra Rigopoulou, Vassilis Charmandaris, Yu Gao, Cong Kevin Xu, Paul van der Werf, Tanio Diaz Santos, George C Privon, Yinghe Zhao, Tianwen Cao, Y Sophia Dai, Jia-Sheng Huang, David Sanders, Chunxiang Wang, Zhong Wang, Lei Zhu
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Cold molecular gas and PAH emission in the nuclear and circumnuclear regions of Seyfert galaxies

Astronomy & Astrophysics EDP Sciences 639 (2020) a43

Authors:

A Alonso-Herrero, M Pereira-Santaella, D Rigopoulou, I García-Bernete, S García-Burillo, AJ Domínguez-Fernández, F Combes, RI Davies, T Díaz-Santos, D Esparza-Arredondo, O González-Martín, A Hernán-Caballero, EKS Hicks, SF Hönig, NA Levenson, C Ramos Almeida, PF Roche, D Rosario
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Details from ArXiV

ALMA [N \i\i ] 205 \mu m Imaging Spectroscopy of the Lensed Submillimeter galaxy ID 141 at redshift 4.24

(2020)

Authors:

Cheng Cheng, Xiaoyue Cao, Nanyao Lu, Ran Li, Chentao Yang, Dimitra Rigopoulou, Vassilis Charmandaris, Yu Gao, Cong Kevin Xu, Paul van der Werf, Tanio Diaz Santos, George C Privon, Yinghe Zhao, Tianwen Cao, Y Sophia Dai, Jia-Sheng Huang, David Sanders, Chunxiang Wang, Zhong Wang, Lei Zhu
More details from the publisher

Cold molecular gas and PAH emission in Seyfert galaxies

(2020)

Authors:

A Alonso-Herrero, M Pereira-Santaella, D Rigopoulou, I Garcia-Bernete, S Garcia-Burillo, AJ Dominguez-Fernandez, F Combes, RI Davies, T Diaz-Santos, D Esparza-Arredondo, O Gonzalez-Martin, A Hernan-Caballero, EKS Hicks, SF Hoenig, NA Levenson, C Ramos Almeida, PF Roche, D Rosario
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Alma maging of the co (7−6) line emission in the submillimeter galaxy less 073 at z = 4.755

Astrophysical Journal American Astronomical Society 892:2 (2020) 145

Authors:

Yinghe Zhao, Nanyao Lu, Tanio Diaz-Santos, Yu Gao, Kevin Xu, Vassilis Charmandaris, Hanae Inami, Dimitra Rigopoulou, David Sanders, Jiasheng Huang, Zhong Wang

Abstract:

In this paper we present our imaging observations on the CO (7−6) line and its underlying continuum emission of the young submillimeter galaxy LESS 073 at redshift 4.755, using the Atacama Large Millimeter/submillimeter Array (ALMA). At the achieved resolution of ∼1 ′′ .2 × 0 ′′ .9 (8 × 6 kpc2 ), the CO (7−6) emission is largely unresolved (with a deconvolved size of 1′′ .1(±0 ′′ .5) × 0 ′′ .9(±0 ′′ .8).), and the continuum emission is totally unresolved. The CO (7−6) line emission has an integrated flux of 0.86 ± 0.08 Jy km s−1 , and a line width of 343 ± 40 km s−1 . The continuum emission has a flux density of 0.51 mJy. By fitting the observed far-infrared (FIR) spectral energy distribution of LESS 073 with a single-temperature modified blackbody function, we obtained a dust temperature Tdust = 57.6 ± 3.5 K, 60-to-100 µm flux density ratio f60/f100 = 0.86 ± 0.08, and total infrared luminosity LIR = (5.8±0.9)×1012 L⊙. The SED-fit-based f60/f100 is consistent with those estimated from various line ratios as advocated by our earlier work, indicating that those proposed line-ratiobased method can be used to practically derive f60/f100 for high-z sources. The total molecular gas mass of LESS 073 is (3.3 ± 1.7) × 1010 M⊙, and the inferred gas depletion time is about 43 Myr.
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