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We present the results of reflection calculations that treat the relevant physics with a minimum of assumptions. The temperature and ionization structure of the top five Thomson depths of an illuminated disc are calculated while also…

天体物理学 · 物理学 2009-09-17 D. R. Ballantyne , R. R. Ross , A. C. Fabian

Like any fluid heated from below, the atmosphere is subject to vertical instability which triggers convection. Convection occurs on small time and space scales, which makes it a challenging feature to include in climate models. Usually…

大气与海洋物理 · 物理学 2015-06-12 Corentin Herbert , Didier Paillard

We analyse the proximity zone of the intergalactic matter around high-redshift quasars in a cosmological environment. In a box of 64 h-1 Mpc base length we employ dark matter only simulations. For estimating the hydrogen temperature and…

宇宙学与河外天体物理 · 物理学 2015-05-28 Adrian M. Partl , Volker Müller , Gustavo Yepes , Stefan Gottlöber

We introduce a simple parametric model of the radio-infrared correlation (i.e., the ratio between the IR luminosity and the 1.4 GHz radio luminosity, $q_{\mbox{\tiny IR}}$) by considering the energy loss rate of high-energy cosmic ray (CR)…

星系天体物理 · 物理学 2024-08-27 Ilsang Yoon

We establish simple quantitative criterium for the search of new dielectric materials with high values of the refractive index in the visible range. It is demonstrated, that for light frequencies below the band gap the latter is determined…

介观与纳米尺度物理 · 物理学 2020-07-24 Roman Polozkov , Anton Shubnik , Ivan Shelykh , Ivan Iorsh

We present a reanalysis of the HeII Lyman alpha absorption towards the quasars HS1700+6416 and HE2347-4342 using new high S/N, optical observations. An alternative analysis method is applied, which fits the high quality, optical HI data…

天体物理学 · 物理学 2009-11-11 C. Fechner , D. Reimers

We present in this paper mid-infrared (5-8~$\mu$m) spectroscopy toward the massive young binary W3~IRS~5, using the EXES spectrometer in high-resolution mode ($R\sim$50,000) from the NASA Stratospheric Observatory for Infrared Astronomy…

Temperature field contactless measurements in or at the surfaces of semitransparent media are a scientific challenge, as classical thermography techniques based on proper material emission cannot be used. In this work, an alternative method…

The Fe I 6173 {\AA} line is widely used in the measurements of vector magnetic fields by instruments including the Helioseismic and Magnetic Imager (HMI). We perform non-local thermodynamic equilibrium calculations of this line based on…

太阳与恒星天体物理 · 物理学 2018-04-10 Jie Hong , M. D. Ding , Ying Li , Mats Carlsson

The physical state of interstellar gas and dust is dependent on the processes which heat and cool this medium. To probe heating and cooling of the ISM over a large range of infrared surface brightness, on sub-kiloparsec scales, we employ…

Theoretical calculations of the cooling potential of radiative cooling materials are crucial for determining their cooling capability under different meteorological conditions and evaluating their performance. To enable these calculations,…

大气与海洋物理 · 物理学 2021-08-19 Jyotirmoy Mandal , Xin Huang , Aaswath P. Raman

Atmospheric CO$_2$ concentrations are being closely monitored by remote sensing experiments which rely on knowing line intensities with an uncertainty of 0.5\%\ or better. Most available laboratory measurements have uncertainties much…

To help address the need for predicting radiative heat transfer (RHT) behavior of molten salts, we conducted a comprehensive review of methods and data from infrared optical spectroscopic measurements on molten fluoride salts.…

Quasar spectra provide a unique opportunity to investigate the intergalactic medium at high redshifts. The spectral analysis of the Ly$\alpha$ forest allows us to constrain the effective equation of state of the intergalactic medium and its…

宇宙学与河外天体物理 · 物理学 2019-04-02 K N Telikova , S A Balashev , P S Shternin

We propose a methodology to perform a self-consistent analysis of the physical properties of the emitting gas of HII galaxies adequate to the data that can be obtained with the XXI century technology. This methodology requires the…

The refractive index of a matter is foundational to quantify the light-matter interaction of the medium. However, the classical description of refractive index is based on macroscopic homogenization and is limited to describing the local…

光学 · 物理学 2024-11-18 Jungho Mun , Sathwik Bharadwaj , Zubin Jacob

We present comprehensive experimental line lists of methane (CH4) at high temperatures obtained by recording Fourier transform infrared emission spectra. Calibrated line lists are presented for the temperatures 300 - 1400 degC at twelve 100…

天体物理仪器与方法 · 物理学 2013-08-23 R. J. Hargreaves , C. A. Beale , L. Michaux , M. Irfan , P. F. Bernath

We report the infrared dielectric properties of $\alpha$-quartz in the temperature range from $1.5\ \mathrm{K}$ to $200\ \mathrm{K}$. Using an infrared free-electron laser, far-infrared reflectivity spectra of a single crystal $y$-cut were…

材料科学 · 物理学 2019-04-25 Christopher J. Winta , Martin Wolf , Alexander Paarmann

We report infrared reflectivity spectra for a new correlated cupric oxide system Sr2Cu(Re0.69Ca0.31)Oy with y ~ 0.6 at several temperatures ranging between 8 and 380 K. The reflectivity spectrum at 300 K comprises of several optical…

强关联电子 · 物理学 2009-11-11 J. Ahmad , M. Shizuya , M. Isobe , S. Alam , H. Uwe

We have obtained long-slit, infrared spectra of Jupiter with the Anglo Australian Telescope in the K and H bands at a resolving power of 2260. Using a line-by-line, radiative transfer model with the latest, improved spectral line data for…

太阳与恒星天体物理 · 物理学 2015-05-27 Lucyna Kedziora-Chudczer , Jeremy Bailey
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