Aims. We discuss and characterize micro-lensing among the 3 brightest lensed images (A-B-C) of the gravitational lens system RXS J1131-1231 (a quadruply imaged AGN) by means of long slit optical and NIR spectroscopy. Qualitative constraints on the size of different emission regions are derived. We also perform a spectroscopic study of two field galaxies located within 1.6 arcmin radius from the...

Context. Analysis of thermal dust emission spectra for dust mineralogy and physical grain properties depends on comparison spectra, which are either laboratory-measured infrared extinction spectra or calculated extinction cross sections based on certain grain models. Often, the agreement between these two kinds of spectra, if available, is not yet satisfactory because of the strong influence of...

The Sloan Digital Sky Survey (SDSS) currently provides by far the largest homogeneous sample of intermediate signal-to-noise ratio (S/N) optical spectra of galaxies and quasars. The fully automated SDSS spectroscopic reduction pipeline has provided spectra of unprecedented quality that cover the wavelength range 3800 − 9200 Å. However, in common with spectra from virtually all multi-object surv...

Three electronic absorption systems for C5 at 511, 445, and 232 nm and one for C6, C8, and C9 centered at 228, 259, and 288 nm have been observed in the gas phase. The C5 chain was produced in both discharge and ablation sources and detected using resonant two-color two-photon ionization spectroscopy involving 10.5 eV photons. The decay of the excited singlet electronic states indicates fast in...

The autofluorescence other than intrinsic protein emission of viable cultured mammalian cells has been investigated. The fluorescence was found to originate in discrete cytoplasmic vesicle-like regions and to be absent from the nucleus. Excitation and emission spectra of viable cells revealed at least two distinct fluorescent species. Comparison of cell spectra with spectra of known cellular me...

The electronic structure of wurtzite InN 0001̄ thin films has been studied using a combination of soft x-ray emission and absorption spectroscopies. We measured the elementally and orbitally resolved InN valence and conduction bands by recording the N K-edge spectra. Theoretical calculations of the N 2p partial density of states were performed within the GW framework of many body perturbation th...

We find that spectra of certain Iron Low Ionization Broad Absorption Line (FeLOBAL) QSOs, which are characterized by low–ionization emission and blue shifted absorption lines, can be well matched with the spectral synthesis code SYNOW. SYNOW is a resonance scattering code and assumes that line emission comes from a single line forming region. This interpretation is novel as traditionally line e...