Quantifying acetaldehyde in astronomical ices and laboratory analogues: IR spectra, intensities, 13C shifts, and radiation chemistry [0.03%]
天文学冰和实验室类似物中乙醛的定量：红外光谱、强度、13C位移及辐射化学反应
Reggie L Hudson,Robert F Ferrante
Reggie L Hudson
Acetaldehyde is of interest to astrochemists for its relevance to both interstellar and cometary chemistry, but little infrared (IR) spectral data have been published for the solid phases of this compound. Here we present IR spectra of thre...
The extent of ionization in simulations of radio-loud AGNs impacting kpc gas discs [0.03%]
无线电明亮活动星系核模拟中千秒差距气盘的电离程度
Moun Meenakshi,Dipanjan Mukherjee,Alexander Y Wagner et al.
Moun Meenakshi et al.
We use the results of relativistic hydrodynamic simulations of jet-interstellar medium (ISM) interactions in a galaxy with a radio-loud AGN to quantify the extent of ionization in the central few kpcs of the gaseous galactic disc. We perfor...
Shearing-box simulations of MRI-driven turbulence in weakly collisional accretion discs [0.03%]
弱碰撞吸积盘中由MRI驱动的湍流的剪切盘模拟
Philipp Kempski,Eliot Quataert,Jonathan Squire et al.
Philipp Kempski et al.
We present a systematic shearing-box investigation of MRI-driven turbulence in a weakly collisional plasma by including the effects of an anisotropic pressure stress, i.e. anisotropic (Braginskii) viscosity. We constrain the pressure anisot...
Kristopher Cooper,Iain G Hannah,Brian W Grefenstette et al.
Kristopher Cooper et al.
We investigate the spatial, temporal, and spectral properties of 10 microflares from AR12721 on 2018 September 9 and 10 observed in X-rays using the Nuclear Spectroscopic Telescope ARray and the Solar Dynamic Observatory's Atmospheric Imagi...
Reference wavelengths of Si ii, C ii, Fe i, and Ni ii for quasar absorption spectroscopy [0.03%]
用于类星体吸收光谱的Si ii、C ii、Fe i和Ni ii的参考波长
Gillian Nave,Christian Clear
Gillian Nave
Wavelengths of absorption lines in the spectra of galaxies along the line of sight to distant quasars can be used to probe the variablility of the fine structure constant, α, at high redshifts, provided that the laboratory wavelengths are ...
Hyperfine structure constants for singly-ionized manganese (Mn II) using Fourier Transform Spectroscopy [0.03%]
使用傅里叶变换光谱技术计算单离子锰（Mn II）的超精细结构常数
Keeley Townley-Smith,Gillian Nave,Juliet C Pickering et al.
Keeley Townley-Smith et al.
We expand on the comprehensive study of hyperfine structure (HFS) in Mn II conducted by Holt et al. (1999) by verifying hyperfine magnetic dipole constants (A) for 20 levels previously measured by Holt et al. (1999) and deriving A constants...
Chloe B Richards,Thomas W Baumgarte,Stuart L Shapiro
Chloe B Richards
We revisit Bondi accretion - steady-state, adiabatic, spherical gas flow on to a Schwarzschild black hole at rest in an asymptotically homogeneous medium - for stiff polytropic equations of state (EOSs) with adiabatic indices Γ > 5/3. A ge...
Andrew Swan,Scott J Kenyon,Jay Farihi et al.
Andrew Swan et al.
WD 0145+234 is a white dwarf that is accreting metals from a circumstellar disc of planetary material. It has exhibited a substantial and sustained increase in 3-5 [Formula: see text]m flux since 2018. Follow-up Spitzer photometry reveals t...
Full spectroscopic model and trihybrid experimental-perturbative-variational line list for CN [0.03%]
CN的全光谱模型和三杂交实验-微扰-变分谱线列表
Anna-Maree Syme,Laura K McKemmish
Anna-Maree Syme
Accurate line lists are important for the description of the spectroscopic nature of small molecules. While a line list for CN (an important molecule for chemistry and astrophysics) exists, no underlying energy spectroscopic model has been ...
A scaling relation for the molecular cloud lifetime in Milky Way-like galaxies [0.03%]
银河系中分子云寿命的标度关系
Sarah M R Jeffreson,Benjamin W Keller,Andrew J Winter et al.
Sarah M R Jeffreson et al.
We study the time evolution of molecular clouds across three Milky Way-like isolated disc galaxy simulations at a temporal resolution of 1 Myr and at a range of spatial resolutions spanning two orders of magnitude in spatial scale from ∼10...