We investigate the effects of dust extinction on integrated absorption-line indices that are widely used to derive constraints on the ages and metallicities of composite stellar systems. Typically, absorption-line studies have been performed on globular clusters or elliptical galaxies, which are mostly dust-free systems. However, many ...
E-print Network
Analysis of the spacing between absorption-line systems in quasar spectra and comparison against deep optical survey data for the separation between superclusters of galaxies indicates that the absorption originates in the superclusters. Supported by analogous data on the absorbing gas in the galactic and Magellanic Cloud halos, this ...
Energy Citations Database
We report the emergence of a high-velocity, broad absorption line outflow in the luminous quasar Ton 34, at zq = 1.928. The outflow is detected through an ultraviolet C IV broad absorption line, in a spectrum obtained in 2006 January by the Sloan Digital Sky Survey. No absorption trough was ...
NASA Astrophysics Data System (ADS)
Quasar absorption lines in flat universes with nonzero cosmological constant Lambda are examined and
NASA Technical Reports Server (NTRS)
... Accession Number : AD0619963. Title : INVESTIGATION OF NARROW LINE ABSORPTIONS IN SINGLE CRYSTAL CALCITE. ...
DTIC Science & Technology
... Title : ABSORPTION LINE SERIES AND AUTOIONIZATION RESONANCE STRUCTURE ANALYSIS IN THE ULTRAVIOLET SPECTRUM OF SR I,. ...
New spectra of MWC314 are presented; they indicate that the V/R emission line flux ratios show signs of varying in an opposite way to the absorption line radial velocities. The latter appear to be due to apparently non-periodic pulsations, perhaps in strange modes.
Ammonia was detected in the circumstellar envelope of IRC +10216 by means of three infrared absorption lines in the nu sup 2 band around 950/cm. The lines are fully resolved at a resolution of 0.22 km/sec and indicate that most of the circumstellar gas is...
National Technical Information Service (NTIS)
Measurements of absorption in the lines of (C-12)O, (C-13)O, HCO(+), HCN, CN, and CS toward the nuclear continuum source in Centaurus A are reported. The spectra show a number of features which can be attributed to individual molecular clouds with properties similar to dense molecular clouds in the Galaxy. The deepest absorption at the ...
Nov 1, 1977 ... This atlas of infrared absorption line contains absorption line parameters (line strength vs.
NASA Website
A new method of studying the emission lines of prominences is found, based on the use of triplet lines. The main results of its application for an investigation of the green triplet lines of magnesium and the H/sub 10/, H/sub 11/, and H/sub 12/ Balmer lines in a quiescent prominence of October 15, 1960, are ...
The optical absorption lines of quasars are examined, and implications of the lines for the physical
We have established a new database of absorption and emission line measurements from the Sloan Digital Sky Survey 7th data release for the galaxies within a redshift of 0.2. This work used publicly available codes, pPXF(penalized pixel-fitting) and GANDALF(gas and absorption line fitting), to achieve robust ...
Experimental evidence is presented for the change of Einstein's A- coefficients for spontaneous transitions from the upper laser level of argon ion laser discharge due to the presence of the high- intensity laser flux. To demonstrate that this quenching effect cannot be attributed to a reduction in self-absorption of the strong spontaneous emission ...
In a new study of UV emission lines of symbiotic binaries, we confirm the redshift of optically thick resonance lines of highly ionized atoms, compared with optically thin intercombination lines. We show that this is very probably due to P Cygni absorption on the short wavelength sides of the resonance ...
The IUE data on NGC 7469 for different epochs between June 1978 and May 1981 were compared, as were data for NGC 7469 and other galaxies. The dereddened continuum, harder in 1978 than in 1981, can be fitted to a straight line indicative of a one component nonthermal source. Emission lines show variation. Several weak ...
Image-dissector scanner observations of the emission-line spectrum of NGC 1052 are discussed. The scan of the elliptical galaxy NGC 584 is used to remove the integrated stellar absorption-line features from the spectrum of NGC 1052. The O iii lines indicate Tapprox. =33,000 K. The observed ...
In this work, we perform the detailed analysis of absorption features in spectra of magnetar candidates observed by XMM-Newton satellite. No significant line-like feature has been found. This negative result may indicate the possible presence of smoothing out the absorption features mechanisms.
Terahertz absorption spectra and dispersion of biologically important substances such as sugar, water, hemoglobin, lipids and tissues are studied. The characteristic absorption lines in the frequency range of a terahertz spectrometer (0.1�3.5 THz) are found. The refraction indices and ...
A heterodyne spectrometer for the 10 micron wavelength range was used for the investigation of absorption lines in planetary and stellar atmospheres with very high resolution. The atmosphere of Mars and the circumstellar envelopes of bright IR stars were investigated using IR telescopes. The Mars observations provide the isotope ratios C-12/C-13 and ...
There is evidence from radio-loud quasars to suggest that the distribution of the H{beta} broad emission line (BEL) gas is arranged in a predominantly planar orientation, and this result may well also apply to radio-quiet quasars. This would imply that the observed FWHM of the H{beta} BELs is dependent on the orientation of the line of sight to the gas. If ...
There is evidence from radio-loud quasars to suggest that the distribution of the H? broad emission line (BEL) gas is arranged in a predominantly planar orientation, and this result may well also apply to radio-quiet quasars. This would imply that the observed FWHM of the H? BELs is dependent on the orientation of the line of sight to the gas. If this view ...
quasar's broad emission lines. The reddest extent of the broad-line absorption .... lines from the quasar and the low signal-to-noise ...
... Descriptors : (*VAPOR PRESSURE, RESONANCE ABSORPTION), (*COPPER, LINE SPECTRA), ABSORPTION SPECTRA, SPECTROSCOPY ...
... Title : Calculation of Molecular Absorption Parameters and Updating the AFGL atmospheric Line Parameter Compilation. ...
... Title : Resonance Line Absorption Method for Determination of Nitric Oxide Concentration. Descriptive Note : Final rept.,. ...
Dec 18, 1998 ... Absorption lines are discrete colors of light that are absorbed by intervening matter; this absorption leaves holes or "lines" in the ...
In the ultraviolet spectra of hot stars, absorption lines can be seen from highly ionized species in
The strongest and generally most useful optical interstellar absorption lines include the D lines of
Classical T Tauri stars (CTTSs) show bright emission lines of molecular hydrogen in their ultraviolet spectra. These fluorescent emission lines are pumped by molecular hydrogen transitions coincident with the hydrogen Lyman-alpha emission line and other UV emission lines. While these emission ...
The spectrum of the peculiar emission-line star XX Oph in the spectral interval 6200 A to 9000 A is described. Strengths of two TiO bandheads at 8859 A and 8937 A indicate the spectral type of the cool companion is M5 or M6. A list of all the emission lines and absorption lines in the spectrum ...
In this paper, we propose a simple method to use the spectral lines which are free from self-absorption to diagnose the plasma generated from a pure Ti target. The method is based on multiplet spectral lines. Multiplets are very useful in the assessment of self-absorption, the intensity ratio of their components is ...
Averaged low-resolution IUE spectra of the Seyfert I galaxy NGC 3783 at two brightness levels are presented. The wavelength interval 1250-1400 A, which is essentially free of emission lines in active galaxies, contains two absorption lines at 1303 A and 1335 A. The line at 1303 A shows, in contrast to the ...
The permitted emission-line profiles of Seyfert galaxies and QSOs often contain more light in the red wing than in the violet wing. Such an asymmetry can arise as a consequence of self-absorption of the line radiation in an expanding system of optically thick clouds. Calculations are presented of the anisotropy of ...
The fiber optic pH sensor described is based on a colorimetric pH indicator and a pH insensitive luminescent compound co-immobilized in a hydrophilic polymer. The absorption spectra of the pH indicator and the luminescent compound overlap. Consequently, the competitive absorption between the pH ...
Irradiation damage in lithium-doped silicon gives rise to the well-known Q luminescence-absorption system with no-phonon lines at ~1.045 eV. In irradiated lithium-doped material with a high carbon concentration a second luminescence-absorption system is also prominent at higher energy, the S system with no-phonon ...
A heat exchanger bypass system for an absorption refrigeration system is disclosed. The bypass system operates to pass strong solution from the generator around the heat exchanger to the absorber of the absorption refrigeration system when strong solution builds up in the generator above a selected level indicative of solidification of ...
DOE Information Bridge
... Title : INVESTIGATION OF NARROW LINE PARAMAGNETIC RESONANCE ABSORPTION SPECTRUM IN SINGLE CRYSTAL CALCITE,. ...
... Title : INVESTIGATION OF NARROW LINE PARAMAGNETIC RESONANCE ABSORPTION SPECTRUM IN SINGLE CRYSTAL CALCITE. ...
... Title : AN INVESTIGATION OF THE EFFECT OF MULTIPLE ABSORPTION AND EMISSION OF RESONANCE-LINE PHOTONS ON LINE SHAPE ...
Crystal spectrometry and absorption edge technique have the capability to overcome the gap in accuracy between experiment and theory in the strong field domain of QED. New results are presented which indicate the capacity of these methods to measure the energies of X-rays emitted by highly charged heavy ions at modern storage rings with a precision ...
The stronger resonant X-ray lines from the intracluster gas should be observable as absorption lines
The present paper reports the study of the effects of temperature on the absorption cross-sections of ammonia in spectral region of 200-220 nm. By using a grating monochromator with high resolution, deuterium lamp, closed gas sample cell and gas compounding device, the photoabsorption cross sections of ammonia were measured at temperatures ranging from 308 to 397 K. The ...
PubMed
This webpage from the University of California, Riverside offers an explanation of emission and absorption lines. A diagram, with descriptive text, shows how light from a star can produce each type of line. Also, an image of solar absorption lines is provided.
NSDL National Science Digital Library
... The results are com pared with measurements by Tomiser on the line widths of the sodium D-line at various tempera tures and pressures. ...
... MOLECULAR ROTATION, ABSORPTION SPECTRA, SPECTRUM ANALYZERS, SPECTRAL LINES, COLLISION BROADENING, LINE SCANNING ...
The effective level of line formation for spectroscopic absorption lines has long been regarded as a
Fine structure consisting of more than twenty sharp lines has been observed near the absorption edge of silver-doped ZnTe single crystals containing dislocation loops. Possible explanations for the observed spectrum based on excitons bound to the dislocation loops or on "dangling bonds" associated with the presence of the dislocation loops are advanced. ...
We report on atomic gas (H I) and molecular gas (as traced by CO(2-1)) redshifted absorption features toward the nuclear regions of the closest powerful radio galaxy, Centaurus A (NGC 5128). Our H I observations using the Very Long Baseline Array allow us to discern with unprecedented sub-parsec resolution H I absorption profiles toward different positions ...
We present the first results from the Complete Optical and Radio Absorption Line System (CORALS) survey for Damped Lyman Alpha (DLA) systems based on a radio-selected sample of quasars. We find that the number density and neutral gas content of CORALS DLAs is in good agreement with previous surveys. These results indicate that dust ...
We explore a new geometry allowing effective excitation of the lowest antisymmetric standing spin wave mode in ferromagnetic metallic films with symmetrical boundary conditions. The approach is based on the use of a coplanar waveguide with the ferromagnetic film, Permalloy (Py), playing the role of the signal line. In addition, we study a signal line which ...
... Abstract : Studies concerning the mechanisms of intestinal glucose absorption indicate that the monophosphoesterases are not distributed along ...
... fields. The transverse field absorption is evaluated and the connection with the anomalous skin effect is indicated. The ...
The results of numerical modeling of lithium lines in the spectra of late-type M dwarfs are discussed. Line-by-line and just-overlapping approximations are used to compute the molecular opacities. Synthetic spectra are computed near two lithium lines, a resonance line at 6708 A and a subordinate ...
We present the first grating-resolution X-ray spectra of the Seyfert 1 galaxy NGC 3783, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-Ray Observatory. These spectra reveal many narrow absorption lines from the H-like and He-like ions of O, Ne, Mg, Si, S, and Ar as well as Fe xvii-Fe xxi L-shell lines. ...
Photometric and spectrographic observations of the recent outburst of V1017 Sgr are reported. The B magnitude varied from the 11th to 14th magnitude during the period February to June 1973. The shape and amplitude of the light curve are similar to the light curve observed at the 1901 outburst. Broad emission lines and very weak and vague ...
Using evolutionary population synthesis, we present 13 refined absorption-line indices defined by the Lick Observatory Image Dissector Scanner (Lick/IDS) system for an extensive set of instantaneous-burst binary stellar populations (BSPs) at high resolution (~0.3{AA}), and 38 indices at intermediate resolution (3{AA}). The ages of the ...
The findings of spectroscopic observations of several off-nuclear regions in NGC 1275 are studied with a view to their implications for hypotheses as to high-velocity emissions. The observations indicate that the high velocity gas does not exhibit a smooth gradient, but instead appears disrupted. Absorption is found from the high velocity system in the Na ...
Recent observations of Broad Absorption Line (BAL) quasars demonstrated that the soft X-ray emission of these objects is extremely weak, and convincing evidence for very strong absorption by a high column density (~1023.5 cm-2) was obtained for PG 1411+442, even though it is one of the few BAL QSOs strongly detected in soft X-rays. ...
We describe a general model for a gaseous galactic corona, and demonstrate that it is in harmony with a variety of observational and theoretical constraints. We then compute the ionization equilibria of H, He, C, N, O, Si, and S atoms in the corona and determine the strengths of resonance absorption lines arising therein. To this end, we obtain approximate ...
We discuss the nature and origin of a rich complex of narrow absorption lines in the quasar J102325.31+514251.0 at redshift 3.447. We measure nine CIV(??1548, 1551) absorption line systems with velocities from -1400 to -6200 kms-1, and full widths at half-minimum ranging from 16 to 350 kms-1. We also detect other ...
A technique for measuring ''effective'' absorption coefficients is described. It circumvents deviations from Beer's law caused when the excitation source bandwidth is larger than the absorber bandwidth. The technique employs a fluorescence cell placed after an absorption cell to selectively monitor ...
Observations with a resolution of 600,000 of interstellar absorption from the CN 3874.6 A, CH 4300.3 A, and CH(+) 4232.5 A lines reveal several new features of the clouds along the line of sight toward Zeta Oph. The CN line consists of two overlapping components which are similar to those seen in the CO pure ...
The physical and abundance properties of the gaseous components of planetary nebulae have traditionally been studied using their rich, pan-chromatic emission line spectra. However, absorption lines produced within the column of nebular gas in front of the central star can provide complementary information, giving access to ions and ...
The aim of this work was to describe a new method for optical monitoring of solutes in a spent dialysate. The method utilizes UV light absorption employing a commercially available spectrophotometer. Measurements were performed both on collected dialysate samples and on-line. The concentration of several removed solutes and electrolytes in the serum and in ...
... Title : MEASUREMENT OF WEAK IR ABSORPTION WITH A TUNABLE LASER: THE HYDROGEN S SUB 2(1) LINE STRENGTH, IN: APPLIED ...
