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KBSS-InCLOSE. I. Design and First Results from the Inner Circumgalactic Medium of QSO Line-of-sight Emitting Galaxies at z ∼ 2–3 * * Some of the data presented herein were obtained at Keck Observatory, which is a private 501(c)3 non-profit organization operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. (2024)
Journal Article
Nuñez, E. H., Steidel, C. C., Kirby, E. N., Rudie, G. C., Prusinski, N. Z., Chen, Y., Zhuang, Z., Strom, A. L., Erb, D. K., Pettini, M., Welsh, L., Rupke, D. S. N., & Cooke, R. J. (2024). KBSS-InCLOSE. I. Design and First Results from the Inner Circumgalactic Medium of QSO Line-of-sight Emitting Galaxies at z ∼ 2–3 * * Some of the data presented herein were obtained at Keck Observatory, which is a private 501(c)3 non-profit organization operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The Astrophysical Journal, 976(1), Article 41. https://doi.org/10.3847/1538-4357/ad70b6

We present the design and first results of the inner circumgalactic medium (CGM) of QSO line-of-sight emitting galaxies at z ∼ 2–3, Keck Baryonic Structure Survey (KBSS)-InCLOSE. The survey will connect galaxy properties (e.g., stellar mass M *, inte... Read More about KBSS-InCLOSE. I. Design and First Results from the Inner Circumgalactic Medium of QSO Line-of-sight Emitting Galaxies at z ∼ 2–3 * * Some of the data presented herein were obtained at Keck Observatory, which is a private 501(c)3 non-profit organization operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation..

Robust Support for Semi-automated Reductions of Keck/NIRSPEC Data Using PypeIt (2024)
Journal Article
Carvalho, A. S., Doppmann, G., Westfall, K. B., Pelliccia, D., Prochaska, J. X., Hennawi, J., Davies, F. B., Brodheim, M., Wang, F., & Cooke, R. (2024). Robust Support for Semi-automated Reductions of Keck/NIRSPEC Data Using PypeIt. Research Notes of the American Astronomical Society, 8(10), Article 271. https://doi.org/10.3847/2515-5172/ad8bb5

We present a data reduction pipeline (DRP) for Keck/Near InfraRed SPECtrograph (NIRSPEC) built as an addition to the PypeIt Python package. The DRP is capable of reducing multi-order echelle data taken both before and after the detector upgrade in 20... Read More about Robust Support for Semi-automated Reductions of Keck/NIRSPEC Data Using PypeIt.

Cosmology and fundamental physics with the ELT-ANDES spectrograph (2024)
Journal Article
Martins, C., Cooke, R., Liske, J., Murphy, M., Noterdaeme, P., Schmidt, T., …Zanutta, A. (2024). Cosmology and fundamental physics with the ELT-ANDES spectrograph. Experimental Astronomy, 57(1), Article 5. https://doi.org/10.1007/s10686-024-09928-w

State-of-the-art 19th century spectroscopy led to the discovery of quantum mechanics, and 20th century spectroscopy led to the confirmation of quantum electrodynamics. State-of-the-art 21st century astrophysical spectrographs, especially ANDES at ESO... Read More about Cosmology and fundamental physics with the ELT-ANDES spectrograph.

MUSE Analysis of Gas around Galaxies (MAGG) – IV. The gaseous environment of z ∼ 3–4 Ly α emitting galaxies (2022)
Journal Article
Lofthouse, E. K., Fumagalli, M., Fossati, M., Dutta, R., Galbiati, M., Arrigoni Battaia, F., Cantalupo, S., Christensen, L., Cooke, R. J., Longobardi, A., Murphy, M. T., & Prochaska, J. X. (2023). MUSE Analysis of Gas around Galaxies (MAGG) – IV. The gaseous environment of z ∼ 3–4 Ly α emitting galaxies. Monthly Notices of the Royal Astronomical Society, 518(1), 305 - 331. https://doi.org/10.1093/mnras/stac3089

We study the link between galaxies and H I-selected absorption systems at z ∼ 3–4 in the MUSE Analysis of Gas around Galaxies (MAGG) survey, an ESO large programme consisting of integral field spectroscopic observations of 28 quasar fields hosting 61... Read More about MUSE Analysis of Gas around Galaxies (MAGG) – IV. The gaseous environment of z ∼ 3–4 Ly α emitting galaxies.

Harvesting the Lyα forest with convolutional neural networks (2022)
Journal Article
Cheng, T.-Y., Cooke, R. J., & Rudie, G. (2022). Harvesting the Lyα forest with convolutional neural networks. Monthly Notices of the Royal Astronomical Society, 517, 755-775. https://doi.org/10.1093/mnras/stac2631

We develop a machine learning based algorithm using a convolutional neural network (CNN) to identify low H I column density Lyα absorption systems (log NHI/cm−2 < 17) in the Lyα forest, and predict their physical properties, such as their H I column... Read More about Harvesting the Lyα forest with convolutional neural networks.

Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O (2022)
Journal Article
Lai, K.-F., Manalili, D., Ubachs, W., Cooke, R., Pettini, M., de Oliveira, N., & Salumbides, E. (2022). Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O. Astrophysical Journal Supplement, 260(2), Article 37. https://doi.org/10.3847/1538-4365/ac6350

A spectroscopic study of atomic oxygen (O I) is performed using the Fourier-transform vacuum ultraviolet (VUV) spectrometer at the Dichroïsme Et Spectroscopie par Interaction avec le Rayonnement Synchrotron beamline of the SOLEIL synchrotron. Transit... Read More about Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O.

Primordial Helium-3 Redux: The Helium Isotope Ratio of the Orion Nebula* (2022)
Journal Article
Cooke, R. J., Noterdaeme, P., Johnson, J. W., Pettini, M., Welsh, L., Peroux, C., Murphy, M. T., & Weinberg, D. H. (2022). Primordial Helium-3 Redux: The Helium Isotope Ratio of the Orion Nebula*. Astrophysical Journal, 932(1), Article 60. https://doi.org/10.3847/1538-4357/ac6503

We report the first direct measurement of the helium isotope ratio, 3He/4He, outside of the Local Interstellar Cloud, as part of science-verification observations with the upgraded CRyogenic InfraRed Echelle Spectrograph. Our determination of 3He/4He... Read More about Primordial Helium-3 Redux: The Helium Isotope Ratio of the Orion Nebula*.

MUSE analysis of gas around galaxies (MAGG) – III. The gas and galaxy environment of z = 3–4.5 quasars (2021)
Journal Article
Fossati, M., Fumagalli, M., Lofthouse, E., Dutta, R., Cantalupo, S., Arrigoni Battaia, F., Fynbo, J., Lusso, E., Murphy, M., Prochaska, J., Theuns, T., & Cooke, R. (2021). MUSE analysis of gas around galaxies (MAGG) – III. The gas and galaxy environment of z = 3–4.5 quasars. Monthly Notices of the Royal Astronomical Society, 503(2), 3044-3064. https://doi.org/10.1093/mnras/stab660

We present a study of the environment of 27 z = 3–4.5 bright quasars from the MUSE Analysis of Gas around Galaxies (MAGG) survey. With medium-depth Multi Unit Spectroscopic Explorer (MUSE) observations (4 h on target per field), we characterize the e... Read More about MUSE analysis of gas around galaxies (MAGG) – III. The gas and galaxy environment of z = 3–4.5 quasars.