Results 81 to 90 of about 5,560 (224)

O VI in the local interstellar medium

, 2009
International audienceWe report preliminary results of a search for O VI absorption in the spectra of ∼100 hot DA white dwarfs observed by the FUSE satellite.
Forbes, AE, Lallement, Rosine, Barstow, J.K., Barstow, JK, Welsh, BY, Lallement, R, Barstow, MA, Barstow, M.A., Forbes, A.E., Boyce, DD, Boyce, D.D., Welsh, B.Y.   +11 more
core   +1 more source

The Local Group L-band Survey: The First Measurements of Localized Cold Neutral Medium Properties in the Low-metallicity Dwarf Galaxy NGC 6822

The Astrophysical Journal
Measuring the properties of the cold neutral medium (CNM) in low-metallicity galaxies provides insights into heating and cooling mechanisms in early Universe-like environments.
Nickolas M. Pingel, Hongxing Chen, Snežana Stanimirović, Eric W. Koch, Adam K. Leroy, Erik Rosolowsky, Chang-Goo Kim, Julianne J. Dalcanton, Fabian Walter, Michael P. Busch, Ryan Chown, Jennifer Donovan Meyer, Cosima Eibensteiner, Deidre A. Hunter, Sumit K. Sarbadhicary, Elizabeth Tarantino, Vicente Villanueva, Thomas G. Williams   +17 more
doaj   +1 more source

Modeling galactic extinction

Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2011
We present a model for interstellar extinction dust, in which we assume a bimodal distribution of extinction carriers, a dispersion of core-mantle grains, supplemented by a collection of PAHs in free molecular form.
C. Cecchi-Pestellini, G. Mulas, S. Casu, M.A. Iati', R. Saija, A. Cacciola, F. Borghese, P. Denti   +7 more
doaj   +1 more source

A survey of ultraviolet interstellar absorption lines

The Astrophysical Journal Supplement Series, 1983
A telescope-spectrometer on the Copernicus spacecraft made possible the measurement of many ultraviolet absorption lines produced by the interstellar gas. The present survey provides data on ultraviolet absorption lines in the spectra of 88 early-type stars.
R. C. Bohlin, E. B. Jenkins, L., Jr. Spitzer, D. G. York, J. K. Hill, B. D. Savage, T. P., Jr. Snow   +6 more
openaire   +1 more source

H i Kinematics and the E(B − V)/N(H i) Ratio

The Astrophysical Journal
The λ 21 cm H i emission that is used to trace the gas-to-dust ratio at high Galactic latitudes has contributions from material beyond the Milky Way disk, with uncertain and likely subsolar metallicity and dust content.
Harvey Liszt
doaj   +1 more source

Absorption and scattering by interstellar dust in the silicon K-edge of GX 5-1

, 2017
We study the absorption and scattering of X-ray radiation by interstellar dust particles, which allows us to access the physical and chemical properties of dust.
Zeegers, S. T., Tielens, A.G.G.M., de Vries, C.P., S. T. Zeegers, A. G. G. M. Tielens, Costantini, E., Chihara, H., Waters, L.B.F.M., S. Zeidler, Vries, C.P., F. de Groot, Mutschke, H., Groot, F., Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis, Tielens, A. G. G. M., C. P. de Vries, L. B. F. M. Waters, H. Chihara, Groot, F. de, H. Mutschke, Zeegers, S.T., E. Costantini, Zeidler, S.   +23 more
core   +1 more source

Correlations between Dust Extinction Features across All Wavelength Scales: From Diffuse Interstellar Bands to R(V)

The Astrophysical Journal
Understanding variations in the dust extinction curve is imperative for using dust as a tracer of local structure in the interstellar medium, understanding dust chemistry, and performing extinction corrections.
Andrew K. Saydjari, Gregory M. Green
doaj   +1 more source

Interstellar absorption lines toward Cep OB4

, 2004
An analysis of optical echelle spectra towards nine stars in the Cep OB4 association is presented. Interstellar absorption lines which arise in the (1, 0) and (2, 0) bands of the CN A $^2\Pi$ – X $^2\Sigma^+$ red system towards BD+66° 1661, BD+66 ...
R. Gredel
core   +1 more source

Interstellar NaI and CaII absorption observed towards the Cygnus Loop SNR

, 2002
We present high resolution spectra ($R \sim 5$ km s-1) of the interstellar NaI and CaII absorption lines observed towards 9 early-type stars with distances ranging from 250 to 2300 pc in the line-of-sight towards the Cygnus Loop Supernova Remnant (SNR).
S. Sallmen, R. Lallement, B. Y. Welsh, D. Sfeir   +3 more
core   +1 more source

TWO PHOTON ABSORPTION BY MOLECULAR HYDROGEN AS A MECH ANISM FOR INTERSTELLAR EXTINCTION

, 1970
Author Institution: Electro-Optical SystemsA review is given of the theory of two-photon absorption with emphasis on selection rules, orders-of-magnitude of cross-sections and the concept of a ``two-photon absorption spectrum.
Duardo, J. A.
core