Dr. Genoveva Micheva Profile

Dr. Genoveva Micheva

at Leibniz-Institut für Astrophysik Potsdam

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Author

Publications (7)

Proceedings Article | 27 August 2024 Presentation + Paper

Assessment and removal of thin tearing resembling structures in deep-depletion CCDs

Eloy Hernandez, Javier Reyes, Olga Bellido-Tirado, Domingo Alvarez, Genoveva Micheva, Stella Vješnica, Roelof de Jong, Hakan Önel

Proceedings Volume 13103, 131030I (2024) https://doi.org/10.1117/12.3017636

KEYWORDS: Astronomical detectors, Detector development, Fluctuations and noise, Sensors, Charge-coupled devices, CCD image sensors, Spectrographs, Light emitting diodes, Ultraviolet light emitting diodes

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The 4-Metre Multi-Object Spectrograph Telescope (4MOST) is a second-generation instrument build for ESO’s VISTA telescope in Chile, enabling large-scale spectroscopic surveys of the night sky. 4MOST will complement several European space-based observatories and future ground-based survey facilities, furthering our understanding of the universe. The instrument uses over 2 400 science optical fibres to collect and transmit light simultaneously from various astronomical targets to three spectrographs. Two thirds of the fibres will go to low-resolutions spectrographs and the remaining to a high-resolution spectrograph. Each spectrograph has three channels. Each channel uses a charge-coupled device (CCD) 231-C6 from Teledyne e2v, which gives a total of 9 science detectors. The detectors have a resolution of 6k × 6k with a pixel size of 15 μm which accounts for a total image area of 92.2mm × 92.4 mm. The image area has four separately connected sections that allow the read-out to be conducted through four output circuits. The data acquisition and signal processing unit of each detector is a new general detector controller (NGC), which is a versatile platform for infrared and optical detectors developed by ESO that is already employed in several state-of-the-art instruments. During the testing phase of the different spectrographs, flat frames were acquired that showed an unidentified image structure manifesting mostly as diagonal lines across all quadrants with central-to-edge preferential pathways. The observed fingerprint showed a slightly elevated charge amount over a few pixels wide when compared to the rest of the array. Due to the dynamic variation of the affected pixels across successive frames, the feasibility of mitigating the described phenomenon through calibration was impractical. While large format CCDs of this nature find extensive application, and the NGC is a prevalent choice for ESO instrumentation, the observation of this particular artifact appears to be previously undocumented, although it shows some similarities with the tearing patterns observed in other deep-depletion devices which are associated with field distortions in thick silicon. In this work, we describe, evaluate, and present a removal technique for the undefined image structure observed in the science detectors of the 4MOST instrument.

Proceedings Article | 19 July 2024 Presentation

4MOST: the 4-metre Multi-Object Spectroscopic Telescope Project at the start of commissioning

Roelof de Jong, Olga Bellido-Tirado, Joar Brynnel, Aida Ezzati Amini, Steffen Frey, Christine Füßlein, Domenico Giannone, Diana Johl, Silke Kuba, Ulrike Lemke, Genoveva Micheva, Allar Saviauk, Matthias Steinmetz, Jakob Walcher, Roland Winkler, Karin Lind, Jonathan Loveday, Vincenzo Mainieri, Jean-François Pirard, Wolfgang Gaessler, Florence Laurent, Andrea Merloni, Ramón Navarro, Alban Remillieux, Florian Rothmaier, Scott Smedley, Nicholas Walton

Proceedings Volume 13096, 130960J (2024) https://doi.org/10.1117/12.3018339

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Proceedings Article | 18 July 2024 Poster + Paper

Preliminary characterization and verification of 4MOST in Europe

Genoveva Micheva, Olga Bellido-Tirado, Joar Brynnel, Steffen Frey, Andreas Kelz, Roelof de Jong, Allar Saviauk, Roland Winkler, Florence Laurent, Walter Seifert, Ingo Stilz, Florian Rothmaier, Alexander Pramskiy, Michael Lehmitz, Wolfgang Gaessler, Ioannis Politopoulos, Jonathan Irwin, Michael Irwin, Jens-Kristian Krogager, Gérard Zins, Andreas Quirrenbach, Wenli Xu

Proceedings Volume 13096, 1309623 (2024) https://doi.org/10.1117/12.3019870

KEYWORDS: Spectrographs, Calibration, Fiber science, Data acquisition, Telescopes, Equipment, Xenon, Observational astronomy

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Proceedings Article | 9 January 2023 Presentation + Paper

The 4MOST calibration plan

Genoveva Micheva, Roelof de Jong, Michael Irwin, Olivier Schnurr, Roland Winkler, Olga Bellido-Tirado, Marica Valentini, Jakob Walcher, Joar Brynnel

Proceedings Volume 12186, 121860V (2023) https://doi.org/10.1117/12.2624169

KEYWORDS: Calibration, Spectrographs, Stars, Sensors, Telescopes, Signal processing, Optical fibers, Spectral calibration, Charge-coupled devices, CCD image sensors

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Proceedings Article | 29 August 2022 Presentation + Paper

4MOST: the 4-metre multi-object spectroscopic telescope project in the assembly, integration, and test phase

Roelof de Jong, Olga Bellido-Tirado, Joar Brynnel, Aida Ezzati Amini, Steffen Frey, Christine Füßlein, Miklos Gäbler, Domenico Giannone, Diana Johl, Silke Kuba, Ulrike Lemke, Genoveva Micheva, Allar Saviauk, Matthias Steinmetz, Jakob Walcher, Roland Winkler, Karin Lind, Jonathan Loveday, Sofia Feltzing, Richard McMahon, Vincenzo Mainieri, Jean-François Pirard, Thomas Bensby, Maria Bergemann, Cristina Chiappini, Norbert Christlieb, Maria-Rosa Cioni, Johan Comparat, Simon Driver, Isobel Hook, Mike Irwin, Jean-Paul Kneib, Jochen Liske, Andrea Merloni, Ivan Minchev, Johan Richard, Else Starkenburg, Mark Sullivan, Clare Worley, Wolfgang Gaessler, Florance Laurent, Johan Pragt, Alban Remillieux, Florian Rothmaier, Scott Smedley, Ingo Stilz, Nicholas Walton, David Alexander, Ross Church, Scott Croom, Luke Davies, Caroline Heneka, Nikolay Kacharov, Jörg Knoche, Georges Kordopatis, Mirko Krumpe, Sarah Martell, Peder Norberg, Ingrid Pelisoli, Sanjib Sharma, Jesper Storm, Elmo Tempel

Proceedings Volume 12184, 1218414 (2022) https://doi.org/10.1117/12.2628965

KEYWORDS: Calibration, Telescopes, Spectrographs, Stars, Control systems, Metrology, Cameras, Spectroscopy, Galactic astronomy, Galaxy evolution, Active galactic nuclei

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

The instrumental profile of the 4MOST facility

Roland Winkler, Genoveva Micheva, Steffen Frey, Olga Bellido-Tirado, Roelof deJong

Proceedings Volume 11450, 114502K (2020) https://doi.org/10.1117/12.2562998

KEYWORDS: Telescopes, Spectrographs, Spectroscopes, Astronomical telescopes, Infrared telescopes, Atmospheric sensing, Astronomical imaging, Visible radiation, Infrared astronomy, Infrared spectroscopy

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Proceedings Article | 13 December 2020 Presentation

4MOST: the 4-metre Multi-Object Spectroscopic Telescope project status: instrument manufacturing and integration, operations development, and survey planning

Roelof de Jong, Samual Barden, Olga Bellido-Tirado, Joar Brynnel, Isabella Cesarini, Steffen Frey, Domenico Giannone, Diana Johl, Andreas Kelz, Genoveva Micheva, Hakan Önel, Matthias Steinmetz, Jakob Walcher, Roland Winkler, Sofia Feltzing, Vincenzo Mainieri, Richard McMahon, Amina Helmi, Mike Irwin, Norbert Christlieb, Cristina Chiappini, Ivan Minchev, Else Starkenburg, Thomas Bensby, Maria Bergemann, Johan Comparat, Andrea Merloni, Simon Driver, Jochen Liske, Jean-Paul Kneib, Johan Richard, Maria-Rosa Cioni, Mark Sullivan, Scott Smedley, Alban Remilleux, Florian Rothmaier, Jean-François Pirard, Ingo Stilz, Johan Pragt, Wolfgang Gaessler, Clare Worley, Man Lam, Jörg Knoche, Nicholas Walton

Proceedings Volume 11447, 1144719 (2020) https://doi.org/10.1117/12.2561036

KEYWORDS: Spectroscopes, Telescopes, Astronomical imaging, Manufacturing, Astronomical telescopes, Infrared telescopes, Spectrographs, Visible radiation, Infrared astronomy, Infrared spectroscopy

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Showing 5 of 7 publications

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