GHOST Commissioning Science Results III: Characterizing an iron-poor damped Lyman $\alpha$ system

Trystyn A. M. Berg; Christian R. Hayes; Stefano Cristiani; Alan McConnachie; J. Gordon Robertson; Federico Sestito; Chris Simpson; Fletcher Waller; Timothy Chin; Adam Densmore; Ruben J. Diaz; Michael L. Edgar; Javier Fuentes Lettura; Manuel Gómez-Jiménez; Venu M. Kalari; Jon Lawrence; Steven Margheim; John Pazder; Roque Ruiz-Carmona; Ricardo Salinas; Karleyne M. G. Silva; Katherine Silversides; Kim A. Venn

arXiv · 2404.10058

GHOST Commissioning Science Results III: Characterizing an iron-poor damped Lyman $\alpha$ system

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Abstract

The Gemini High-resolution Optical SpecTrograph (GHOST) is a new echelle spectrograph available on the Gemini-South telescope as of Semester 2024A. We present the first high resolution spectrum of the quasar J1449-1227 (redshift z_em=3.27) using data taken during the commissioning of GHOST. The observed quasar hosts an intervening iron-poor ([Fe/H] = -2.5) damped Lyman alpha (DLA) system at redshift z=2.904. Taking advantage of the high spectral resolving power of GHOST (R~55000), we are able to accurately model the metal absorption lines of the metal-poor DLA and find a supersolar [Si/Fe], suggesting the DLA gas is in an early stage of chemical enrichment. Using simple ionization models, we find that the large range in the C IV/Si IV column density ratio of individual components within the DLA's high ionization absorption profile can be reproduced by several metal-poor Lyman limit systems surrounding the low-ionization gas of the DLA. It is possible that this metal-poor DLA resides within a complex system of metal-poor galaxies or filaments with inflowing gas. The high spectral resolution, wavelength coverage and sensitivity of GHOST makes it an ideal spectrograph for characterizing the chemistry and kinematics of quasar absorption lines.

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Trystyn A. M. Berg, Christian R. Hayes, Stefano Cristiani, Alan McConnachie, J. Gordon Robertson, Federico Sestito, Chris Simpson, Fletcher Waller, Timothy Chin, Adam Densmore, Ruben J. Diaz, Michael L. Edgar, Javier Fuentes Lettura, Manuel Gómez-Jiménez, Venu M. Kalari, Jon Lawrence, Steven Margheim, John Pazder, Roque Ruiz-Carmona, Ricardo Salinas, Karleyne M. G. Silva, Katherine Silversides, Kim A. Venn. 2024-04-15. GHOST Commissioning Science Results III: Characterizing an iron-poor damped Lyman $\alpha$ system. https://arxiv.org/abs/2404.10058

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