The Gemini High Resolution Optical Spectrograph (GHOST) is a fiber-fed spectrograph system on the Gemini South telescope that provides simultaneous wavelength coverage from 348 - 1061nm, and designed for optimal performance between 363 - 950nm. It can observe up to two objects simultaneously in a 7.5 arcmin diameter field of regard at R = 56,000 or a single object at R = 75,000. The spectral resolution modes are obtained by using integral field units to image slice a 1.2" aperture by a factor of five in width using 19 fibers in the high resolution mode and by a factor of three in width using 7 fibers in the standard resolution mode. GHOST is equipped with hardware to allow for precision radial velocity measurements, expected to approach meters per second precision. Here, we describe the basic design and operational capabilities of GHOST, and proceed to derive and quantify the key aspects of its on-sky performance that are of most relevance to its science users.
@article{arxiv.2401.07452,
title = {The Science Performance of the Gemini High Resolution Optical Spectrograph},
author = {Alan W. McConnachie and Christian R. Hayes and J. Gordon Robertson and John Pazder and Michael Ireland and Greg Burley and Vladimir Churilov and Jordan Lothrop and Ross Zhelem and Venu Kalari and André Anthony and Gabriella Baker and Trystyn Berg and Edward L. Chapin and Timothy Chin and Adam Densmore and Ruben Diaz and Jennifer Dunn and Michael L. Edgar and Tony Farrell and Veronica Firpo and Javier Fuentes and Manuel Gomez-Jimenez and Tim Hardy and David Henderson and Alexis Hill and Kathleen Labrie and Jaclyn Jensen and Sam Lambert and Jon Lawrence and G. Scott Macdonald and Steven Margheim and Bryan Millar and Rolf Muller and Jon G. Nielsen and Gabriel Pérez and Carlos Quiroz and Roque Ruiz-Carmona and Kim M. Sebo and Federico Sestito and Kareleyne Silva and Chris Simpson and Greg Smith and Sudharshan Venkatesan and Fletcher Waller and Lewis Waller and Ivan Wevers and Kim A. Venn and Peter Young},
journal= {arXiv preprint arXiv:2401.07452},
year = {2024}
}
Comments
37 pages, 27 figures. Accepted for publication in Publications of the Astronomical Society of the Pacific