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Summary

TARSIS (Tetra-ARm Super-Ifu Spectrograph) is a new instrument proposed by the TARSIS Consortium for the Calar Alto Observatory 3.5m.

We propose the design and construction of TARSIS, a new wide-FoV, blue-optimized, intermediate-resolution Integral Field Spectrograph (IFS). This will be a unique instrument that is able to explore large areas of the sky in blind spectroscopy reaching relatively unexplored wavelengths as blue as 320 nm and until 760 nm. Such an instrument is not available at the CAHA neither in any observatory that is accessible to the Spanish astronomical community.

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The Instrument

TARSIS, a unique instrument and the niche for the Calar Alto Observatory 3.5m

The requirements for the TARSIS instrument are drawn from scientific top-level requirements. In order to achieve them, the TARSIS instrument relies on the replication of 3 high-efficiency, all-refractive, VPH-based, blue-optimized (320-520nm) spectrographs and 1 red-optimized one (510-760nm) based on that developed for MEGARA at GTC. Thus, TARSIS is composed by its focal-plane optics and 4 wavelength-optimized spectrographs & CCDs.

 

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Science

CATARSIS, the Calar Alto “Tetra-ARmed Super-Ifu spectrograph” Survey

CATARSIS will carry out a magnitude limited (mAB<22.0) spectroscopic survey over an area of 1 deg2 with a spectral resolution ranging from R~1000 to 2000 and a wavelength coverage from 320-760 nm. The fields are chosen to target clusters of galaxies at z~0.15 up to the infall region and the filaments joining them. We aim at collecting galaxy spectra with high-enough S/N to undertake a detailed analysis of their star formation histories, stellar and nebular abundances. The redshift has been chosen so the rest-frame spectra (~278-661 nm) includes the NUV region, essential for detailed analysis of stellar populations, as well as Hα and [NII], needed to cover our science goals.

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The Team

A project led by the TARSIS Consortium: Universidad Complutense de Madrid (UCM), CAHA, Instituto de Astrofísica de Andalucía (IAA-CSIC), INAOE, Universidad de Sevilla (US) and FRACTAL company.

CATARSIS Survey Team: The CATARSIS Survey team includes scientists from all TARSIS Consortium institutions and from other Spanish and foreign research institutions and Universities.

Instrument Team (roles): M. García Vargas (Project Manager), A. Pérez (System Engineer), S. Tulloch (CCD Engineer), E. Carrasco (Spectrographs optics leader), R. Izazaga (Optics lab manager), E. Sánchez (Optical Designer), M. Maldonado (Mechanical Engineer), A. Castillo (Control S/W leader), S. Pascual (Software Engineer), J. Zamorano (on-site UV tests). More to come.