Results 21 to 30 of about 63,242 (201)

Diffuse Interstellar Bands – The Unidentified Part of the Interstellar Absorption Spectrum [PDF]

open access: yesSymposium - International Astronomical Union, 1989
The unidentified (since 1921) diffuse interstellar bands (DIBs) are discussed together with their relations to other interstellar absorptions sucn as: continuous extinction, polarization and atomic or molecular absorption lines. It is shown that DIBs do not form the absorption spectrum of one agent, but probably of several (3 or more).
openaire   +1 more source

Hydrogen wall and heliosheath Lyman-alpha absorption toward nearby stars: possible constraints on the heliospheric interface plasma flow

open access: yes, 2002
In this paper, we study heliospheric Ly-$\alpha$ absorption toward nearby stars in different lines of sight. We use the Baranov-Malama model of the solar wind interaction with a two-component (charged component and H atoms) interstellar medium ...
Baranov   +43 more
core   +1 more source

Kinematics of a high-redshift galaxy: A case study [PDF]

open access: yesSerbian Astronomical Journal, 2000
A kinematics of a z = 2.81 galaxy toward bright QSO 0528-250, as inferred from the absorption spectroscopy is discussed. There are sufficient arguments for a far-reaching conclusion that we are observing an older, uninvolved version of the local Galactic
Ćirković M.M.
doaj   +1 more source

The Complex Interstellar Na I Absorption toward h and Chi Persei

open access: yes, 2004
Recent high spatial and spectral resolution investigations of the diffuse interstellar medium (ISM) have found significant evidence for small-scale variations in the interstellar gas on scales less than or equal to 1 pc.
Lauroesch, James T.   +2 more
core   +2 more sources

High-Resolution X-ray Spectroscopy of the Interstellar Medium: Structure at the Oxygen Absorption Edge [PDF]

open access: yes, 2003
(Abbrev.) We present high-resolution spectroscopy of the oxygen K-shell interstellar absorption edge in 7 X-ray binaries using the HETGS onboard Chandra.
Adrienne M. Juett   +4 more
core   +1 more source

Distribution of Interstellar Reddening Material in the Galactic Plane [PDF]

open access: yesJournal of Astronomy and Space Sciences, 1987
By using the recently determined color excess and distance data of classical cepheids by Kim(1985), the distribution of interstellar reddening material was studied to see the general picture of the average rate of interstellar absorption out to about 7 ...
Chulhee Kim
doaj  

On the Absorption and Emission Properties of Interstellar Grains

open access: yes, 2005
Our current understanding of the absorption and emission properties of interstellar grains are reviewed. The constraints placed by the Kramers-Kronig relation on the wavelength-dependence and the maximum allowable quantity of the dust absorption are ...
Li, Aigen
core   +1 more source

Observations of interstellar Lyman-α absorption [PDF]

open access: yesSymposium - International Astronomical Union, 1970
Absorption at the Lyman-α transition from interstellar neutral hydrogen has been observed in the ultraviolet spectra of 18 nearby O and B stars. Radiation damping is the dominant cause of line broadening, which makes the derived line-of-sight column densities proportional to the square of the observed equivalent widths.
openaire   +1 more source

Absorption by Spinning Dust: a Contaminant for High-Redshift 21 cm Observations

open access: yes, 2018
Spinning dust grains in front of the bright Galactic synchrotron background can produce a weak absorption signal that could affect measurements of high redshift 21 cm absorption.
Draine, B. T., Miralda-Escudé, Jordi
core   +1 more source

Shaken or Stirred: The Diffuse Interstellar Medium with Exceptionally High SiO Abundance

open access: yesThe Astrophysical Journal, 2023
Interstellar shocks, a key element of stellar feedback processes, shape the structure of the interstellar medium (ISM) and are essential for the chemistry, thermodynamics, and kinematics of interstellar gas.
Daniel R. Rybarczyk   +2 more
doaj   +1 more source

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