Mid- to far-infrared (IR) lines are suited study dust obscured regions in galaxies, because IR spectroscopy allows us explore the most hidden where heavily star formation as well accretion onto supermassive black-holes occur. This is mostly important at redshifts of 1<z<3, when baryonic mass galaxies has been assembled. We provide reliable calibrations mid- far-IR ionic fine structure lines, br...

In more detail, consider a classical model of matter in which spectral lines are associated with oscillators. In particular, consider a gas of atoms with two closely spaced spectral lines of angular frequencies ω1,2 = ω0 ± Δ/2, where Δ ω0. Each line has the same damping constant (and spectral width) γ. Ordinarily, the gas would exhibit strong absorption of light in the vicinity of the spectral ...

The solar EUV irradiance is a key input for thermospheric and ionospheric models. Difficulties in continuously measuring the calibrated spectrum has prompted the use of various surrogate quantities. Although most proxies correlate quite well with the spectral variability, their use for modelling purposes becomes increasingly unsatisfactory. A different and data-driven approach is considered her...

Context. Spectral-line asymmetries (displayed as bisectors) and wavelength shifts are signatures of the hydrodynamics in solar and stellar atmospheres. Theory may precisely predict idealized lines, but accuracies in real observed spectra are limited by blends, few suitable lines, imprecise laboratory wavelengths, and instrumental imperfections. Aims. We extract bisectors and shifts until the ‘u...

We present precise relative radial velocity (RV) measurements for the rapidly oscillating Ap (roAp) star 33 Librae measured from high resolution data spanning the wavelength interval 5000–6200 Å. We find that pulsational radial velocity amplitude determined over a broad wavelength range (≈ 100 Å) depends on the spectral region that is examined and can be as high as 60 m s at 5600 Å and as low a...

A compilation of the available spectroscopic millimeter and submillimeterwave data of the ground and first excited states of C1-methyl formate has been carried out. The exhaustive analysis of the available transition lines of HCOOCH3 (Willaert et al. 2006; Maeda et al. 2008a,b; Carvajal et al. 2009) has led to the assignment of 7457 spectral lines by means of a global fit of 45 parameters, usin...