Results 21 to 30 of about 2,644 (226)
Electronic spectroscopy of open-chain and aromatic hydrocarbon cations in neon matrices [PDF]
, 2012 Considerable scientific interest has been devoted to the so-called diffuse interstellar bands (DIBs)—hundreds of absorption features of different strength and width, located in the visible and near infrared, and arising from the interstellar medium ...
Nagy, Adam
core +1 more source
New and Improved Lyα Reconstructions for M and K Dwarfs
The Astrophysical Journal, 2023 The Ly α emission line is the brightest UV emission line in M and K dwarf spectra and serves as an important tool for studies of stellar chromospheres, the interstellar medium, and exoplanet atmospheres.
Angeli Sandoval +3 more
doaj +1 more source
δ Orionis: Further temporal variability and evidence for small-scale structure in the interstellar medium [PDF]
, 2001 We report here the detection of both spatial and temporal variations in interstellar absorption in the line of sight to δ Orionis. First, we present new high-resolution (R≈110 000) observations of the interstellar D lines of Na i towards both δ Ori A and
Howarth, ID +5 more
core +1 more source
Investigating the nature of absorption lines in the Chandra X-ray spectra of the neutron star binary 4U 1820−30 [PDF]
, 2008 We use four Chandra gratings spectra of the neutron star low-mass X-ray binary 4U 1820–30 to better understand the nature of certain X-ray absorption lines in X-ray binaries, including the Ne II, Ne III, Ne IX, O VII, and O VIII lines.
R. Wijnands +18 more
core +1 more source
Optimizing End-to-End System Performance for Millimeter and Submillimeter Spectroscopy of Protostars: Wideband Heterodyne Receivers and Sideband-Deconvolution Techniques for Rapid Molecular-Line Surveys [PDF]
, 2011 This thesis describes the construction, integration, and use of a new 230-GHz ultra-wideband heterodyne receiver, as well as the development and testing of a new sideband-deconvolution algorithm, both designed to enable rapid, sensitive molecular-line ...
Sumner, Matthew Casey
core +1 more source
The Astrophysical Journal, 2023 Molecules and particles make up ∼40%–70% of carbon in the interstellar medium, yet the exact chemical structure of these constituents remains unknown. We present carbon K-shell absorption spectroscopy of the Galactic interstellar medium obtained with the
John Staunton, Frits Paerels
doaj +1 more source
Narrow absorption lines from intervening material in supernovae
Astronomy & AstrophysicsNarrow interstellar absorption features in supernova (SN) spectra serve as valuable diagnostics for probing dust extinction and the presence of circumstellar or interstellar material.
Gutiérrez Claudia P. +3 more
doaj +1 more source
The Astrophysical Journal Letters, 2023 Direct observations of low-mass, low-metallicity galaxies at z ≳ 4 provide an indispensable opportunity for detailed inspection of the ionization radiation, gas flow, and metal enrichment in sources similar to those that reionized the universe. Combining
Xiaojing Lin +21 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2023 High-resolution absorption, dispersed fluorescence emission, and photoionization cross sections are presented for gas-phase adamantane excited by synchrotron radiation in the exciting-photon energy range of 6–30 eV. Relative and absolute absorption cross
Lutz Marder +11 more
doaj +1 more source
Interstellar absorption lines in the ultraviolet [PDF]
, 1974 This Proefschrift is the report on studies of interstellar lines which I have carried out since early 1972. As these studies mainly are based on new observations, several small publications accrued, as reproduced in the chapters 2 through 6 and the ...
Boer, Klaas Sjoerds de, +1 more
openaire +2 more sources