Results 91 to 100 of about 5,191,368 (191)

Absolute Absorption and Dispersion in a Thermal Rb Vapour at High Densities and High Magnetic Fields. [PDF]

, 2013
This thesis presents a comparative study of the measured and calculated absolute absorption and dispersion properties of the Rb D lines through a dense thermal vapour in the absence and presence of an applied magnetic field.
WELLER, LEE
core  

Preliminary characterization of calcium chemical environment in apatitic and non-apatitic calcium phosphates of biological interest by X-ray absorption spectroscopy [PDF]

, 2005
Several reports have mentioned the existence of non-apatitic environments of phosphate and carbonate ions in synthetic and biological poorly crystalline apatites.
Susini, Jean, Eichert, Diane, Salomé, Murielle, Banu, Mihai, Rey, Christian   +4 more
core   +1 more source

The Distance to the Magellanic Stream: Constraints from Optical Absorption along Stellar Sight Lines

The Astrophysical Journal
The Magellanic Stream is a large tail of neutral and ionized gas originating from tidal and hydrodynamical interactions between the Magellanic Clouds as they orbit the Milky Way (MW).
Sapna Mishra, Andrew J. Fox, J. V. Smoker, Scott Lucchini, Elena D’Onghia   +4 more
doaj   +1 more source

Thomson Thick X-ray Absorption in a Broad Absorption Line Quasar, PG 0946+301

, 2015
We present a deep ASCA observation of a broad absorption line quasar (BALQSO) PG 0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any other detector.
Shields, John, Kashyap, V, Shlosman, I, Elvis, M, Voit, M, Mathur, Smita, van Breugel, Willem Johannes Maria, de Kool, Marthijn, Korista, Kirk, Brotherton, Michael, Hines, D C, Peterson, Byron, Crenshaw, M, Arav, Nahum, Goodrich, R., Hamann, F, Green, Paul   +16 more
core   +1 more source

Probing the He ii Reionization ERA via Absorbing C iv Historical Yield (HIERACHY). III. The C iv Absorber Catalog and Initial Results on Cosmic Abundance Evolution at z ≈ 3–5

The Astrophysical Journal
As part of the HIERACHY program, we collect the high signal-to-noise ratio and high-spectral resolution optical spectra of 25 quasars at z  ≈ 4–5 to constrain the C iv evolution at z  ≈ 3–5.
Xiaodi Yu, Zhijie Qu, Zheng Cai, Jiang-Tao Li, Huiyang Mao, Xin Wang   +5 more
doaj   +1 more source

Metal-strong Inflows at the Outer-galactic-scale of a Quasar

The Astrophysical Journal
We present an analysis of the absorption-line system in the Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph spectrum at a redshift of z _a = 3.1448 associated with the quasar SDSS J122040.23+092326.96, whose systematic redshift is z _e =
Qiguo Tian, Lei Hao, Yipeng Zhou, Xiheng Shi, Tuo Ji, Peng Jiang, Lin Lin, Zhenya Zheng, Hongyan Zhou   +8 more
doaj   +1 more source

Measuring the Mean Free Path of H i Ionizing Photons at 3.2 ≤ z ≤ 4.6 with DESI Y1 Quasars

The Astrophysical Journal Letters
The mean free path of ionizing photons in the intergalactic medium (IGM; ${\lambda }_{{\rm{mfp}}}^{912}$ ) is a crucial quantity in modeling the ionization state of the IGM and the extragalactic ultraviolet background, and it is widely used in ...
Anning Gao, J. Xavier Prochaska, Zheng Cai, Siwei Zou, Cheng Zhao, Zechang Sun, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, Arjun Dey, P. Doel, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, K. Honscheid, S. Juneau, A. Kremin, P. Martini, A. Meisner, R. Miquel, J. Moustakas, A. Muñoz-Gutiérrez, J. A. Newman, I. Pérez-Ràfols, G. Rossi, E. Sanchez, M. Schubnell, D. Sprayberry, G. Tarlé, B. A. Weaver, H. Zou   +33 more
doaj   +1 more source

The Cosmic Ultraviolet Baryon Survey (CUBS). VII. On the Warm-hot Circumgalactic Medium Probed by O vi and Ne viii at 0.4 ≲ z ≲ 0.7

The Astrophysical Journal
This paper presents a newly established sample of 103 unique galaxies or galaxy groups at 0.4 ≲ z ≲ 0.7 from the Cosmic Ultraviolet Baryon Survey (CUBS) for studying the warm-hot circumgalactic medium (CGM) probed by both O vi and Ne viii absorption. The
Zhijie Qu, Hsiao-Wen Chen, Sean D. Johnson, Gwen C. Rudie, Fakhri S. Zahedy, David DePalma, Joop Schaye, Erin T. Boettcher, Sebastiano Cantalupo, Mandy C. Chen, Claude-André Faucher-Giguère, Jennifer I-Hsiu Li, John S. Mulchaey, Patrick Petitjean, Marc Rafelski   +14 more
doaj   +1 more source

Probing the Coherence of Metal Absorbers toward Background Quasar Pairs

The Astrophysical Journal
We investigate the spatial coherence of metal absorption lines in the circumgalactic medium using 4115 quasar pairs from Sloan Digital Sky Survey DR16. We identify 184 Mg ii (15 with dual detections) and 50 C iv (11 with dual detections) absorber pairs ...
Jing Li, Rui-Jing Lu, Wei-Rong Huang
doaj   +1 more source

UV spectroscopic instrumentation for formaldehyde detection in the indoor environment [PDF]

, 2014
The aim of this project was to assess the feasibility of using UV spectroscopy for a simple detection system for formaldehyde gas in the indoor environment.
Davenport, John
core   +1 more source