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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

MESMER: MeerKAT Search for Molecules in the Epoch of Reionization

ArXiv e-prints (2011)

Authors:

I Heywood, RP Armstrong, R Booth, AJ Bunker, RP Deane, MJ Jarvis, JL Jonas, ME Jones, H Kloeckner, J Kneib, KK Knudsen, F Levrier, D Obreschkow, D Rigopoulou, S Rawlings, OM Smirnov, AC Taylor, A Verma, J Dunlop, MG Santos, ER Stanway, C Willott
Details from ArXiV

Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS

Monthly Notices of the Royal Astronomical Society 415:4 (2011) 3473-3484

Authors:

I Valtchanov, J Virdee, RJ Ivison, B Swinyard, P van der Werf, D Rigopoulou, E da Cunha, R Lupu, DJ Benford, D Riechers, I Smail, M Jarvis, C Pearson, H Gomez, R Hopwood, B Altieri, M Birkinshaw, D Coia, L Conversi, A Cooray, G de Zotti, L Dunne, D Frayer, L Leeuw, A Marston, M Negrello, MS Portal, D Scott, MA Thompson, M Vaccari, M Baes, D Clements, MJ Michalowski, H Dannerbauer, S Serjeant, R Auld, S Buttiglione, A Cava, A Dariush, S Dye, S Eales, J Fritz, E Ibar, S Maddox, E Pascale, M Pohlen, E Rigby, G Rodighiero, DJB Smith, P Temi, J Carpenter, A Bolatto, M Gurwell, JD Vieira

Abstract:

We present Herschel-Spectral and Photometric Imaging Receiver (SPIRE) Fourier transform spectrometer (FTS) and radio follow-up observations of two Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS)-detected strongly lensed distant galaxies. In one of the targeted galaxies H-ATLAS J090311.6+003906 (SDP.81), we detect [Oiii]88μm and [Cii]158μm lines at a signal-to-noise ratio of ~5. We do not have any positive line identification in the other fainter target H-ATLAS J091305.0-005343 (SDP.130). Currently, SDP.81 is the faintest submillimetre galaxy with positive line detections with the FTS, with continuum flux just below 200mJy in the 200-600μm wavelength range. The derived redshift of SDP.81 from the two detections isz= 3.043 ± 0.012, in agreement with ground-based CO measurements. This is the first detection byHerschelof the [Oiii]88μm line in a galaxy at redshift higher than 0.05. Comparing the observed lines and line ratios with a grid of photodissociation region (PDR) models with different physical conditions, we derive the PDR cloud densityn≈ 2000cm-3 and the far-ultraviolet ionizing radiation fieldG0≈ 200 (in units of the Habing field - the local Galactic interstellar radiation field of 1.6 × 10-6 W m-2). Using the CO-derived molecular mass and the PDR properties, we estimate the effective radius of the emitting region to be 500-700pc. These characteristics are typical for star-forming, high-redshift galaxies. The radio observations indicate that SDP.81 deviates significantly from the local far-infrared/radio (FIR/radio) correlation, which hints that some fraction of the radio emission is coming from an active galactic nucleus (AGN). The constraints on the source size from millimetre-wave observations put a very conservative upper limit of the possible AGN contribution to less than 33 per cent. These indications, together with the high [Oiii]/FIR ratio and the upper limit of [Oi]63μm/[Cii]158μm, suggest that some fraction of the ionizing radiation is likely to originate from the AGN. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
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GOODS-Herschel: a population of 24 μm dropout sources at z < 2

ASTRONOMY & ASTROPHYSICS 534 (2011) ARTN A15

Authors:

GE Magdis, D Elbaz, M Dickinson, HS Hwang, V Charmandaris, L Armus, E Daddi, E Le Floc'h, H Aussel, H Dannerbauer, D Rigopoulou, V Buat, G Morrison, J Mullaney, D Lutz, D Scott, D Coia, A Pope, M Pannella, B Altieri, D Burgarella, M Bethermin, K Dasyra, J Kartaltepe, R Leiton, B Magnelli, P Popesso, I Valtchanov
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Spectral Energy Distribution of Far-infrared Bright Quasar Sample in the Lockman Hole

GALAXY EVOLUTION: INFRARED TO MILLIMETER WAVELENGTH PERSPECTIVE 446 (2011) 241-+

Authors:

Y Dai, J-S Huang, A Omont, E Hatziminaoglou, C Willmer, G Fazio, M Elvis, J Bergeron, D Rigopoulou, I Perez-Fournon
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ULTRA STEEP SPECTRUM RADIO SOURCES IN THE LOCKMAN HOLE: SERVS IDENTIFICATIONS AND REDSHIFT DISTRIBUTION AT THE FAINTEST RADIO FLUXES

ASTROPHYSICAL JOURNAL 743:2 (2011) ARTN 122

Authors:

J Afonso, L Bizzocchi, E Ibar, M Grossi, C Simpson, S Chapman, MJ Jarvis, H Rottgering, RP Norris, J Dunlop, RJ Ivison, H Messias, J Pforr, M Vaccari, N Seymour, P Best, E Gonzalez-Solares, D Farrah, CAC Fernandes, J-S Huang, M Lacy, C Maraston, L Marchetti, J-C Mauduit, S Oliver, D Rigopoulou, SA Stanford, J Surace, G Zeimann
More details from the publisher
Details from ArXiV

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