57 citations · 250 across the 12 of their papers we have counts for
12 papers
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…
Detecting the IGM metal enrichment with the 2-point correlation function of the flux. Application to the UVES deep spectrum
Simona Di Stefano, Valentina D'Odorico, Guido Cupani +5
The distribution and the abundance of metals in the intergalactic medium (IGM) have strong implications on galaxy formation and evolution models. The ionic transitions of heavy ele…
The Mystery of Alpha and the Isotopes
John K. Webb, Chung-Chi Lee, Dinko Milakovic +3
We report unbiased AI measurements of the fine structure constant in two proximate absorption regions in the spectrum of the quasar HE05154414. The data are high resolution,…
Varying alpha, blinding, and bias in existing measurements
Chung-Chi Lee, John K. Webb, Robert F. Carswell +3
The high resolution spectrograph ESPRESSO on the VLT allows measurements of fundamental constants at unprecedented precision and hence enables tests for spacetime variations predic…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Non-uniqueness in quasar absorption models and implications for measurements of the fine structure constant
Chung-Chi Lee, John K. Webb, Dinko Milaković +1
High resolution spectra of quasar absorption systems provide the best constraints on temporal or spatial changes of fundamental constants in the early universe. An important system…
Getting the model right; an information criterion for spectroscopy
John K. Webb, Chung-Chi Lee, Robert F. Carswell +1
Robust model-fitting to spectroscopic transitions is a requirement across many fields of science. The corrected Akaike and Bayesian information criteria (AICc and BIC) are most fre…
A new era of fine structure constant measurements at high redshift
Dinko Milaković, Chung-Chi Lee, Robert F. Carswell +3
New observations of the quasar HE05154414 have been made using the HARPS spectrograph on the ESO 3.6m telescope, aided by the Laser Frequency Comb (LFC). We present three import…
Artificial intelligence and quasar absorption system modelling; application to fundamental constants at high redshift
Chung-Chi Lee, John K. Webb, R. F. Carswell +1
Exploring the possibility that fundamental constants of Nature might vary temporally or spatially constitutes one of the key science drivers for the European Southern Observatory's…
Four direct measurements of the fine-structure constant 13 billion years ago
Michael R. Wilczynska, John K. Webb, Matthew Bainbridge +14
Observations of the redshift z=7.085 quasar J1120+0641 have been used to search for variations of the fine structure constant, alpha, over the redshift range 5.5 to 7.1. Observatio…
A crucial test for astronomical spectrograph calibration with frequency combs
Rafael A. Probst, Dinko Milaković, Borja Toledo-Padrón +23
Laser frequency combs (LFCs) are well on their way to becoming the next-generation calibration sources for precision astronomical spectroscopy. This development is considered key i…
Precision and consistency of astrocombs
Dinko Milaković, Luca Pasquini, John K Webb +1
Astrocombs are ideal spectrograph calibrators whose limiting precision can be derived using a second, independent, astrocomb system. We therefore analyse data from two astrocombs (…