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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. Niranjan Thatte

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics
  • Instrumentation
  • Exoplanets and planetary physics

Sub department

  • Astrophysics

Research groups

  • Astronomical instrumentation
  • Exoplanets and Stellar Physics
  • Galaxy formation and evolution
  • Extremely Large Telescope
Niranjan.Thatte@physics.ox.ac.uk
Telephone: 01865 (2)73412
Denys Wilkinson Building, room 709
  • About
  • Teaching
  • Publications

First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications

Publications of the Astronomical Society of the Pacific IOP Publishing 132:1016 (2020) 104503

Authors:

Rupert H Dodkins, Kristina K Davis, Briley Lewis, Sumedh Mahashabde, Benjamin A Mazin, Isabel A Lipartito, Neelay Fruitwala, Kieran O’Brien, Niranjan Thatte
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Simulating gas kinematic studies of high-redshift galaxies with the HARMONI integral field spectrograph

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 498:2 (2020) 1891-1904

Authors:

Mark LA Richardson, Laurence Routledge, Niranjan Thatte, Matthias Tecza, Ryan CW Houghton, Miguel Pereira-Santaella, Dimitra Rigopoulou
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HARMONI - first light spectroscopy for the ELT: spectrograph camera lens mounts

Proceedings of SPIE - The International Society for Optical Engineering SPIE 11451 (2020)

Authors:

A Hidalgo, J Kariuki, J Lynn, W Cheng, A Lowe, Ft Bagci, F Clarke, I Lewis, I Tosh, H Schnetler, J Capone, M Tecza, M Booth, M Rodrigues, N Cann, N Thatte, Z Ozer, T Foster

Abstract:

HARMONI is the first light visible and near-infrared (NIR) integral field spectrograph for the Extremely Large Telescope(ELT). The HARMONI spectrograph will have four near-infrared cameras and two visible, both with seven lenses of various materials and diameters ranging from 286 to 152 mm. The lens mounts design has been optimized for each lens material to compensate for thermal stresses and maintain lens alignment at the operational temperature of 130 K. We discuss their design and mounting concept, as well as assembly and verification steps. We show initial results from two prototypes and outline improvements in the mounting procedures to reach tighter lens alignments. To conclude, we present a description of our future work to measure the decentering of the lenses when cooled down and settled.
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HARMONI: First light spectroscopy for the ELT: Final design and assembly plan of the spectrographs

Proceedings of SPIE - The International Society for Optical Engineering SPIE 11447 (2020)

Authors:

Z Ozer, H Schnetler, Ft Bagci, M Booth, M Brock, N Cann, J Capone, Jc Ortiz, G Dalton, N Dobson, T Foster, Ah Valadez, J Kariuki, I Lewis, A Lowe, J Lynn, M Rodrigues, I Tosh, F Clarke, M Tecza, N Thatte

Abstract:

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from R (≡λ/Δλ) 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The instrument uses a field splitter and image slicer to divide the field into 4 sub-units, each providing an input slit to one of four nearly identical spectrographs. This proceeding presents the final opto-mechanical design and the AIV plan of the spectrograph units.
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Black Hole-Galaxy Scaling Relation Evolution From z~2.5: Simulated Observations With HARMONI on the ELT

Frontiers in Astronomy and Space Sciences Frontiers 6 (2019) 73

Authors:

Begoña García-Lorenzo, Ana Monreal-Ibero, Evencio Mediavilla, Miguel Pereira-Santaella, Niranjan Thatte
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