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Sanchez Moreno, Francisco ManuelAuthorCedazo, R.AuthorGonzalez-Guardia, E.AuthorGarcía, M.AuthorMEGARA: a new generation optical spectrograph for GTC
Publicated to:Proceedings Of Spie - The International Society For Optical Engineering. 9147 (91470O): 91470O- - 2014-01-01 9147(91470O), DOI: 10.1117/12.2047825
Authors: Gil de Paz, A; Gallego, J; Carrasco, E; Iglesias-Paramo, J; Cedazo, R; Vilchez, J M; Garcia Vargas, M L; Arrillaga, X; Carrera, M A; Castillo-Morales, A; Castillo-Dominguez, E; Eliche-Moral, M C; Ferrusca, D; Gonzalez-Guardia, E; Lefort, B; Maldonado, M; Marino, R A; Martinez-Delgado, I; Morales Duran, I; Mujica, E; Paez, G; Pascual, S; Perez-Calpena, A; Sanchez-Penim, A; Sanchez-Blanco, E; Tulloch, S; Velazquez, M; Zamorano, J; Aguerri, A L; Barrado y Navascues, D; Bertone, E; Cardiel, N; Cava, A; Cenarro, J; Chavez, M; Garcia, M; Guichard, J; Guzman, R; Herrero, A; Huelamo, N; Hughes, D; Jimenez-Vicente, J; Kehrig, C; Marquez, I; Masegosa, J; Mayya, Y D; Mendez-Abreu, J; Molla, M; Munoz-Tunon, C; Peimbert, M; Perez-Gonzalez, P G; Perez Montero, E; Rodriguez, M; Rodriguez-Espinosa, J M; Rodriguez-Merino, L; Rosa-Gonzalez, D; Sanchez-Almeida, J; Sanchez Contreras, C; Sanchez-Blazquez, P; Sanchez Moreno, F M; Sanchez, S F; Sarajedini, A; Serena, F; Silich, S; Simon-Diaz, S; Tenorio-Tagle, G; Terlevich, E; Terlevich, R; Trujillo, I; Tsamis, Y; Vega, O; Villar, V
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Abstract
MEGARA (Multi-Espectrografo en GTC de Alta Resolucion para Astronomia) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the GTC 10.4m telescope in La Palma. MEGARA offers two IFU fiber bundles, one covering 12.5x11.3 arcsec(2) with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) and another one covering 8.5x6.7 arcsec(2) with a spaxel size of 0.42 arcsec (Small Compact Bundle; SCB). The MEGARA MOS mode will allow observing up to 100 objects in a region of 3.5x3.5 arcmin(2) around the two IFU bundles. Both the LCB IFU and MOS capabilities of MEGARA will provide intermediate-to-high spectral resolutions (R-FWHM similar to 6,000, 12,000 and 18,700, respectively for the low-, mid-and high-resolution Volume Phase Holographic gratings) in the range 3650-9700 angstrom angstrom. These values become R-FWHM similar to 7,000, 13,500, and 21,500 when the SCB is used. A mechanism placed at the pseudo-slit position allows exchanging the three observing modes and also acts as focusing mechanism. The spectrograph is a collimator-camera system that has a total of 11 VPHs simultaneously available (out of the 18 VPHs designed and being built) that are placed in the pupil by means of a wheel and an insertion mechanism. The custom-made cryostat hosts an E2V231-84 4kx4k CCD. The UCM (Spain) leads the MEGARA Consortium that also includes INAOE (Mexico), IAA-CSIC (Spain), and UPM (Spain). MEGARA is being developed under a contract between GRANTECAN and UCM. The detailed design, construction and AIV phases are now funded and the instrument should be delivered to GTC before the end of 2016.
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The work has been published in the journal Proceedings Of Spie - The International Society For Optical Engineering due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2014, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Electrical and Electronic Engineering.
From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 5.29, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jul 2025)
Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-06, the following number of citations:
- WoS: 9
- Scopus: 27
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This work has been carried out with international collaboration, specifically with researchers from: Granada; India; Mexico; Montenegro; Switzerland; United Kingdom; United States of America.