Results 41 to 50 of about 136,681 (287)

X-Ray Spectroscopy of Interstellar Carbon: Evidence for Scattering by Carbon-bearing Material in the Spectrum of 1ES 1553+113

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

BD-22 3467, a DAO-type star exciting the nebula Abell 35 [PDF]

, 2012
Spectral analyses of hot, compact stars with NLTE (non-local thermodynamical equilibrium) model-atmosphere techniques allow the precise determination of photospheric parameters.
Koeppen, J., Kruk, J. W., Rauch, T., Werner, K., Ziegler, M.   +4 more
core   +1 more source

Metal-enriched Neutral Gas Reservoir around a Strongly Lensed Low-mass Galaxy at z = 4 Identified by JWST/NIRISS and VLT/MUSE

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, Zheng Cai, Siwei Zou, Zihao Li, Zuyi Chen, Fuyan Bian, Fengwu Sun, Yiping Shu, Yunjing Wu, Mingyu Li, Jianan Li, Xiaohui Fan, J. Xavier Prochaska, Daniel Schaerer, Stephane Charlot, Daniel Espada, Miroslava Dessauges-Zavadsky, Eiichi Egami, Daniel Stark, Kirsten K. Knudsen, Gustavo Bruzual, Jacopo Chevallard   +21 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

Photodissociation of interstellar N2 [PDF]

, 2013
Molecular nitrogen is one of the key species in the chemistry of interstellar clouds and protoplanetary disks and the partitioning of nitrogen between N and N2 controls the formation of more complex prebiotic nitrogen-containing species.
Alan N. Heays, Brenton R. Lewis, Ewine F, Ruud Visser, Stephen T. Gibson, Van Dishoeck, Wim Ubachs, Xiaohu Li   +7 more
core   +5 more sources

Vibrationally Resolved Absorption and Fluorescence Cross Sections of Adamantane in the Far-ultraviolet Spectral Range on an Absolute Scale

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, Alexander Breier, Nelson de Oliveira, Philipp Reiss, Philipp Schmidt, Christian Ozga, Catmarna Küstner-Wetekam, Thomas Giesen, Laurent Nahon, Andreas Hans, André Knie, Arno Ehresmann   +11 more
doaj   +1 more source

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

, 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, Deepto Chakrabarty, Norbert S. Schulz, Ride S. K., Verner D. A.   +4 more
core   +1 more source

CLASSY VII Lyα Profiles: The Structure and Kinematics of Neutral Gas and Implications for LyC Escape in Reionization-era Analogs

The Astrophysical Journal, 2023
Ly α line profiles are a powerful probe of interstellar medium (ISM) structure, outflow speed, and Lyman-continuum escape fraction. In this paper, we present the Ly α line profiles of the Cosmic Origins Spectrograph (COS) Legacy Archive Spectroscopic ...
Weida Hu, Crystal L. Martin, Max Gronke, Simon Gazagnes, Matthew Hayes, John Chisholm, Timothy Heckman, Matilde Mingozzi, Namrata Roy, Peter Senchyna, Xinfeng Xu, Danielle A. Berg, Bethan L. James, Daniel P. Stark, Karla Z. Arellano-Córdova, Alaina Henry, Anne E. Jaskot, Nimisha Kumari, Kaelee S. Parker, Claudia Scarlata, Aida Wofford, Ricardo O. Amorín, Naunet Leonhardes-Barboza, Jarle Brinchmann, Cody Carr, Alessandra Aloisi   +25 more
doaj   +1 more source

Herschel/HIFI observations of interstellar OH+ and H2O+ towards W49N: a probe of diffuse clouds with a small molecular fraction [PDF]

, 2010
We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N.
A. Coutens, A. Cros, A. G. G. M. Tielens, A. Lorenzani, B. Godard, B. Mookerjea, Brogan, C. Gry, C. Joblin, C. Persson, C. Vastel, D. A. Neufeld, D. C. Lis, D. Teyssier, de Graauw, E. Dartois, E. Falgarone, E. Herbst, F. Boulanger, Fish, Gerin, Godard, Goicoechea, Gwinn, H. Gupta, Indriolo, J. Cernicharo, J. H. Black, J. Krełowski, J. Martín-Pintado, J. Pearson, J. R. Goicoechea, J. Stutzki, J. Zmuidzinas, K. Klein, K. M. Menten, Kre▯owski, L. A. Samoska, Le Petit, Le Petit, Liszt, M. De Luca, M. Gerin, M. Kazmierczak, M. Perault, M. Salez, M. Schmidt, Mürtz, Ossenkopf, P. Encrenaz, P. F. Goldsmith, P. Hennebelle, P. Hily-Blant, P. Rimmer, P. Sonnentrucker, Pilbratt, Plume, R. Kołos, R. Monje, R. Plume, R. Shipman, R. Szczerba, S. Philipp, S. Schlemmer, S. Yu, Sonnentrucker, Strahan, T. A. Bell, T. G. Phillips, T. Giesen, T. R. Geballe, Van der Werf, van Dishoeck, Vastel, Wehinger, Wyrowski   +75 more
core   +2 more sources

Dense molecular clouds in the SN2008fp host galaxy [PDF]

, 2014
(abridged) We use observations of interstellar absorption features, such as atomic and molecular lines as well as diffuse interstellar bands (DIBs), towards SN2008fp to study the physical properties of extra-galactic diffuse interstellar clouds in the ...
Cox, N. L. J., Patat, F.
core   +1 more source