49 citations · 54 across the 7 of their papers we have counts for
8 papers
Nearly pristine gas in a galaxy 1 billion years after the Big Bang
Sarah E. I. Bosman, Frederick B. Davies, Louise Welsh +22
Excitation of carbon and oxygen ions is the primary mechanism by which collapsing gas clouds dissipate heat to form new stars. At early cosmic times, in galaxies with chemically pr…
HRMOS: A High-Resolution Multi-Object Spectrograph for the VLT
Laura Magrini, Thomas Bensby, Sofia Randich +174
This White Paper presents the scientific rationale and instrument concept for HRMOS (High-Resolution Multi-Object Spectrograph), a next-generation instrument proposed for the ESO V…
High-S/N Quasar Observations with HST/COS: Deep Fields for Spectroscopy
Andrew J. Fox, Jerry Kriss, Philipp Richter +49
Hubble is still in prime observing condition for making transformative discoveries in UV astronomy. In this white paper we describe the science case for a deep (S/N>30) UV spectros…
Towards a measurement of the primordial helium isotope ratio
Ryan J. Cooke, James W. Johnson, Pasquier Noterdaeme +4
We report the discovery of two metastable neutral helium (He I*) absorbers in the Milky Way, and use the upgraded CRyogenic InfraRed Echelle Spectrograph on the Very Large Telescop…
Featureless stars: Flux Calibration for Extremely Large Telescopes
Ryan Cooke, Nao Suzuki, J. Xavier Prochaska
The spectrophotometric flux calibration of recent spectroscopic surveys has reached a limiting systematic precision of approximately 1-3 percent, and is often biased near the wavel…
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…
Does the Universe Accelerate Equally in all Directions?
R. Cooke, D. Lynden-Bell
We employ the Union compilation of Type Ia supernovae with a maximum likelihood analysis to search for a dark energy dipole. To approach this problem, we present a simple, computat…