44 citations · 175 across the 6 of their papers we have counts for
10 papers
Cosmological observations to shed light on possible variations - expectations, limitations and status quo
M. Wendt, D. Reimers, P. Molaro
Cosmology contributes a good deal to the investigation of variation of fundamental physical constants. High resolution data is available and allows for detailed analysis over cosmo…
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
S. A. Levshakov, D. Reimers, M. G. Kozlov +2
Aims. To obtain limits on the variation of the fine-structure constant alpha and the electron-to-proton mass ratio mu over different cosmological epochs. Methods. A new approach ba…
HE 0515-4414 - an unusual sub-damped Ly alpha system revisited
R. Quast, D. Reimers, R. Baade
Using STIS and VLT UVES observations we have examined the ionization, abundances, and differential dust depletion of metals, the kinematic structure, and the physical conditions in…
Transition frequency shifts with fine structure constant variation for Fe II: Breit and core-valence correlation correction
S. G. Porsev, K. V. Koshelev, I. I. Tupitsyn +3
Transition frequencies of Fe II ion are known to be very sensitive to variation of the fine structure constant α. The resonance absorption lines of Fe II from objects at cosmologic…
Spectral shape of the UV ionizing background and HeII absorption at redshifts 1.8 < z < 2.9
I. I. Agafonova, S. A. Levshakov, D. Reimers +4
The shape of the UV ionizing background is reconstructed from optically thin metal absorption-line systems identified in spectra of HE2347-4342, Q1157+3143, and HS1700+6416 in the…
Fluctuations of the intergalactic UV background towards two lines of sight
C. Fechner, D. Reimers
We present a reanalysis of the HeII Lyman alpha absorption towards the quasars HS1700+6416 and HE2347-4342 using new high S/N, optical observations. An alternative analysis method…