26 citations · 113 across the 10 of their papers we have counts for
10 papers
A survey of extremely metal-poor gas at cosmic noon: evidence of elevated [O/Fe]
Louise Welsh, Ryan Cooke, Michele Fumagalli +2
We aim to study the high-precision chemical abundances of metal-poor gas clouds at cosmic noon (2<z<4) and investigate the associated enrichment histories. We analyse the abundance…
A determination of the cosmic microwave background temperature using Galactic molecules
Ryan J. Cooke, Louise Welsh
We report a new, reliable determination of the CN excitation temperature of diffuse molecular clouds in the Milky Way, based on ultra high spectral resolution observations. Our det…
KBSS-InCLOSE I: Design and First Results from the Inner CGM of QSO Line Of Sight Emitting Galaxies at z~2-3
Evan Haze Nunez, Charles C. Steidel, Evan N. Kirby +10
We present the design and first results of the Inner Circumgalactic Medium (CGM) of QSO Line of Sight Emitting galaxies at , KBSS-InCLOSE. The survey will connect galaxy…
Towards ultra metal-poor DLAs: linking the chemistry of the most metal-poor DLA to the first stars
Louise Welsh, Ryan Cooke, Michele Fumagalli +1
We present new Keck/HIRES data of the most metal-poor damped Lyman-alpha (DLA) system currently known. By targeting the strongest accessible Fe II features, we have improved the up…
Primordial helium-3 redux: The helium isotope ratio of the Orion nebula
Ryan J. Cooke, Pasquier Noterdaeme, James W. Johnson +5
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…
Oxygen-enhanced extremely metal-poor DLAs: A signpost of the first stars?
Louise Welsh, Ryan Cooke, Michele Fumagalli +1
We present precise abundance determinations of two near-pristine damped Ly systems (DLAs) to assess the nature of the [O/Fe] ratio at [Fe/H] < -3 (i.e. <1/1000 of the solar meta…
The stochastic enrichment of Population II stars
Louise Welsh, Ryan Cooke, Michele Fumagalli
We investigate the intrinsic scatter in the chemical abundances of a sample of metal-poor ([Fe/H]<-2.5) Milky Way halo stars. We draw our sample from four historic surveys and focu…
A limit on Planck-scale froth with ESPRESSO
Ryan Cooke, Louise Welsh, Michele Fumagalli +1
Some models of quantum gravity predict that the very structure of spacetime is `frothy' due to quantum fluctuations. Although the effect is expected to be tiny, if these spacetime…
A bound on the 12C/13C ratio in near-pristine gas with ESPRESSO
Louise Welsh, Ryan Cooke, Michele Fumagalli +1
Using science verification observations obtained with ESPRESSO at the Very Large Telescope (VLT) in 4UT mode, we report the first bound on the carbon isotope ratio 12C/13C of a qui…
Modelling the chemical enrichment of Population III supernovae: The origin of the metals in near-pristine gas clouds
Louise Welsh, Ryan Cooke, Michele Fumagalli
The most metal-poor, high redshift damped Lyman-alpha systems (DLAs) provide a window to study some of the first few generations of stars. In this paper, we present a novel model t…