Mr. Mahesh Mohanan Profile

Mahesh Mohanan

Mechanical Engineer at Australian Astronomical Optics Macquarie Univ

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Author

Publications (8)

Proceedings Article | 18 July 2024 Presentation + Paper

Hector: performance of the new integral field spectrograph instrument for the Anglo-Australian Telescope

Julia Bryant, Sree Oh, Madusha Gunawardhana, Gabriella Quattropani, Gurashish Singh Bhatia, Joss Bland-Hawthorn, David Broderick, Rebecca Brown, Robert Content, Scott Croom, Fred Crous, Tony Farrell, Peter Gillingham, Ellen Houston, Jon Lawrence, Helen McGregor, Seong-Sik Minh, Mahesh Mohanan, Barnaby Norris, Matthew Owers, Naveen Pai, David Robertson, Will Saunders, Sam Vaughan, Sudharshan Venkatesan, Adeline Wang, Ross Zhelem, Jessica Zheng

Proceedings Volume 13096, 130960D (2024) https://doi.org/10.1117/12.3016340

KEYWORDS: Galactic astronomy, Spectrographs, Equipment, Telescopes, Stars, Magnetism, Astronomical imaging, Prisms, Spectral resolution

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Proceedings Article | 29 August 2022 Presentation + Paper

MAVIS: imager and spectrograph

Ellis Simon, Anthony Horton, Christian Schwab, Timothy Chin, Robert Content, Nuwanthika Fernando, Nuria Lorente, Richard McDermid, Mahesh Mohanan, Helen McGregor, Jacob Pember, David Robertson, Scott Smedley, Will Saunders, Lew Waller, Ross Zhelem, Jessica Zheng, Johan Kosmalski, Giovanni Cresci, Trevor Mendel, Andrea Bianco, David Brodrick, Jennifer Burgess, Dionne Haynes, Davide Greggio, François Rigaut, Alessio Zanutta

Proceedings Volume 12184, 1218409 (2022) https://doi.org/10.1117/12.2629238

KEYWORDS: Spectrographs, Imaging systems, Mirrors, Adaptive optics, Spatial resolution, Visible radiation, Imaging spectroscopy, Spherical lenses, Spectroscopy, Diffraction

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Proceedings Article | 29 August 2022 Poster + Paper

Hector spectrograph (spector): mechanical engineering overview

Mahesh Mohanan, Julia Bryant, Rebecca Brown, Scott Croom, Robert Content, Tony Farrell, Michael Goodwin, Jonathan Bland-Hawthorn, Ellen Houston, Urs Klauser, Jon Lawrence, Helen McGregor, Naveen Pai, David Robertson, Will Saunders, Lew Waller, Ross Zhelem, Jessica Zheng

Proceedings Volume 12184, 121847P (2022) https://doi.org/10.1117/12.2630617

KEYWORDS: Spectrographs, Collimators, Kinematics, Cameras, Mechanical engineering, Sensors, Optical alignment, Beam splitters, Tolerancing, Interfaces

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Proceedings Article | 29 August 2022 Poster + Paper

Spector: integration and performance of the multi-object spectrograph for the Anglo-Australian Telescope

Ross Zhelem, Julia Bryant, Joss Bland-Hawthorn, Rebecca Brown, Robert Content, Scott Croom, Tony Farrell, Michael Goodwin, Ellen Houston, Urs Klauser, Jon Lawrence, Slavko Mali, Rolf Muller, Richard Mcdermid, Helen McGregor, Mahesh Mohanan, Barnaby Norris, Naveen Pai, David Robertson, Will Saunders, Lew Waller, Adeline Wang, Jessica Zheng

Proceedings Volume 12184, 1218475 (2022) https://doi.org/10.1117/12.2629649

KEYWORDS: Spectrographs, Telescopes, Sensors, Cameras, Wavefronts, Optical alignment, Collimators, Spectral resolution, Interferometry, Astronomical imaging

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Proceedings Article | 13 December 2020 Presentation + Paper

Hector: a new multi-object integral field spectrograph instrument for the Anglo-Australian Telescope

Julia Bryant, Joss Bland-Hawthorn, Jon Lawrence, Barnaby Norris, Seong-Sik Min, Rebecca Brown, Adeline Wang, Gurashish Singh Bhatia, Will Saunders, Robert Content, Ross Zhelem, Sudharshan Venkatesan, Mahesh Mohanan, Peter Gillingham, Robert Patterson, David Robertson, Naveen Pai, Helen McGregor, Jessica Zheng, Sam Vaughan, Caroline Foster, Sergio Leon-Saval, Scott Croom

Proceedings Volume 11447, 1144715 (2020) https://doi.org/10.1117/12.2560309

KEYWORDS: Spectrographs, Galactic astronomy, Telescopes, Iterated function systems, Robotics, Environmental sensing, Stars, Spectral resolution, Kinematics, Prototyping

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Proceedings Article | 13 December 2020 Poster + Paper

MAVIS: science case, imager, and spectrograph

Simon Ellis, Richard McDermid, Giovanni Cresci, Christian Schwab, Francois Rigaut, Timothy Chin, Robert Content, Anthony Horton, Mahesh Mohanan, Helen McGregor, Jacob Pember, David Robertson, Lew Waller, Ross Zhelem, Stephanie Monty, Trevor Mendel, Matteo Aliverti, Guido Agapito, Simone Antoniucci, Andrea Balestra, Andrea Baruffolo, Maria Bergomi, Andrea Bianco, Marco Bonaglia, Guiseppe Bono, Jean-Claude Bouret, David Brodrick, Lorenzo Busoni, Elena Carolo, Simonetta Chinellato, Jess Cranney, Gayandhi De Silva, Simone Esposito, Daniela Fantinel, Jacopo Farinato, Thierry Fusco, Gaston Gausachs, James Gilbert, Damien Gratadour, Davide Gerggio, Marco Gullieuszik, Pierre Haguenauer, Dionne Haynes, Visa Korkiakoski, Demetrio Magrin, Laura Magrini, Luca Marafatto, Benoit Neichel, Fernando Pedichini, Enrico Pinna, Cedric Plantet, Elisa Portaluri, Kalyan Radhakrishnan, Roberto Ragazzoni, Bernado Salasnich, Stefan Ströbele, Elliott Thorn, Annino Vaccarella, Daniele Vassallo, Valentina Viotto, Frédéric Zamkotsian, Alessio Zanutta, Hao Zhang

Proceedings Volume 11447, 11447A0 (2020) https://doi.org/10.1117/12.2561930

KEYWORDS: Imaging systems, Spectrographs, Visible radiation, Adaptive optics, Stars, Galactic astronomy, Image quality, V band, Spectral resolution, Spatial resolution

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

The Hector Instrument: optical design of the new higher-resolution spectrograph

Ross Zhelem, Robert Content, Will Saunders, Jon Lawrence, Jessica Zheng, Julia Bryant, Joss Bland-Hawthorn, David Robertson, Mahesh Mohanan, Sudharshan Venkatesan

Proceedings Volume 11447, 114478U (2020) https://doi.org/10.1117/12.2562634

KEYWORDS: Spectrographs, Optical design, Telescopes, Beam splitters, Optics manufacturing, Collimators, Cameras, Sensors, Optical fabrication, Robotics

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Proceedings Article | 6 July 2018 Presentation + Paper

Hector: a modular integral field spectrograph instrument for the Anglo-Australian Telescope

Julia Bryant, Joss Bland-Hawthorn, Jon Lawrence, Will Saunders, Robert Content, Scott Croom, Sudharshan Venkatesan, Mahesh Mohanan, Rebecca Brown, Adeline Wang, Ross Zhelem, Peter Gillingham, Robert Patterson, Helen McGregor, Warrick Couch, Jesse van de Sande, Richard McDermid, Sergio Leon-Saval

Proceedings Volume 10702, 107021H (2018) https://doi.org/10.1117/12.2309893

KEYWORDS: Galactic astronomy, Spectral resolution, Spectrographs, Kinematics, Telescopes, Ionization, Robotics, Astronomy

Read Abstract +

Based on the success of the SAMI integral field spectrograph (IFS) instrument on the Anglo-Australian Telescope (AAT) the capacity for large IFS nearby galaxy surveys on the AAT is being substantially expanded with a new instrument called Hector. The high filling-fraction imaging fibre bundles ‘hexabundles’ of the type used on SAMI, are being enlarged to cover up to 30-arcsec diameter. The aim is to reach two effective radii on most galaxies, where the galaxy rotation curve flattens and >75% of the specific angular momentum of disk galaxies is accounted for. Driven by the key science case, Hector will have a 1.3A spectral resolution, enabling high-order stellar kinematics to be measured on a larger fraction of galaxies than with any other IFS instrument. Hector will be on sky in 2019. The first module of Hector, Hector-I, will have 21 hexabundles and >42 sky fibres to observe 20 galaxies and a calibration star simultaneously. It consists of new blue and red-arm spectrographs that have been designed at the Australian Astronomical Observatory (AAO; now called AAO-Macquarie), coupled to the new hexabundles and robotic positioner from AAO-USydney (formerly the Sydney Astrophotonics Instrumentation Laboratory, SAIL) at Sydney University. A novel robotic positioning concept will compensate for varying telecentricity over the 2-degree-field of the AAT to recoup the 20% loss in light at the edge of the field. Hector-I will survey 15,000 galaxies. Additional modules in the future would result in 30,000 galaxies. Hector will take integral field spectroscopy on galaxies with z<0.15 in the 4MOST WAVES-North and WAVES-South∗ regions. The WAVES data, which will come later, will give the environment metrics neces- sary to relate how local and global environments influence galaxy growth through gas accretion, star formation and spins measured with Hector. The WALLABY ASKAP† survey will trace HI gas across the Hector fields, which in combination with Hector will give a complete view of gas accretion and star formation.

Showing 5 of 8 publications

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