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As small solid grains grow into larger ones in protoplanetary nebulae, or in the cloudy atmospheres of exoplanets, they generally form porous aggregates rather than solid spheres. A number of previous studies have used highly sophisticated…

地球与行星天体物理 · 物理学 2015-06-18 Jeffrey N. Cuzzi , Paul R. Estrada , Sanford S. Davis

We present analysis of archival data from multiple XMM-Newton observations of the Seyfert 1 galaxy NGC 4151. Spectral data from the RGS instruments reveal several strong soft X-ray emission lines, chiefly from hydrogen-like and helium-like…

天体物理学 · 物理学 2009-06-23 B. K. Armentrout , S. B. Kraemer , T. J. Turner

Tools for computing detailed optically thick spectral line profiles out of local thermodynamic equilibrium have always been focused on speed, due to the large computational effort involved. With the Lightweaver framework, we have produced a…

天体物理仪器与方法 · 物理学 2021-08-18 Christopher M J Osborne , Ivan Milić

We present the public release of EXP, a basis function expansion C++ library and Python package for running N-body galactic simulations and dynamical discovery. EXP grew out of the need for methodology that seamlessly connects theoretical…

星系天体物理 · 物理学 2025-05-13 Michael S. Petersen , Martin D. Weinberg

Systematic comparisons across theoretical predictions for the properties of dense matter, nuclear physics data, and astrophysical observations (also called meta-analyses) are performed. Existing predictions for symmetric nuclear and neutron…

Gallium oxide (Ga2O3) is a wide-bandgap semiconductor with promising applications in high-power and high-frequency electronics. However, its complex polymorphic nature poses substantial challenges for fundamental studies, particularly in…

材料科学 · 物理学 2026-05-21 Yaohui Gu , Binbo Li , Lingyang Jiang , Yuhui Hu , Wenqiang Liu , Lijun Xu , Pengfei Zhai , Jie Liu , Jinglai Duan

Although electrostatics can be incorporated into machine-learned interatomic potentials, existing approaches are computationally very demanding, limiting large-scale, long-time simulations of electrostatics-driven phenomena such as…

We present here a method to study the distribution of electron density fluctuations in pulsar directions as well as to estimate pulsar distances. The method, based on a simple two-component model of the scattering medium discussed by Gwinn…

天体物理学 · 物理学 2009-10-30 A. A. Deshpande , R. Ramachandran

Energetic particles continuously process water ice across astrophysical and planetary environments, from interstellar clouds and comets to icy planetary surfaces. Interpreting the resulting observables requires a physically grounded…

天体物理仪器与方法 · 物理学 2026-05-08 Gideon Yoffe , Jacques Pienaar , Ioanna Kyriakou , Dimitris Emfietzoglou , Sébastien Incerti , Hoang Tran , Yohai Kaspi

The DArk Matter Particle Explorer (DAMPE) mission revealed a break in the spectrum of cosmic-ray electons and positrons. This is associated with an excess above the expected backgrounds at energies around 1 TeV. Several authors have argued…

宇宙学与河外天体物理 · 物理学 2019-02-21 Geoff Beck , Sergio Colafrancesco

As part of the effort to meet the needs of the Large Synoptic Survey Telescope Dark Energy Science Collaboration (LSST DESC) for accurate, realistically complex mock galaxy catalogs, we have developed GalSampler, an open-source python…

宇宙学与河外天体物理 · 物理学 2020-06-10 Andrew Hearin , Danila Korytov , Eve Kovacs , Andrew Benson , Han Aung , Christopher Bradshaw , Duncan Campbell

An accretion disk in an Active Galactic Nucleus (AGN) harbors and shields dust from external illumination: at the mid-plane of the disk around a $M_{{\rm BH}}=10^{7}M_{\odot}$ black hole, dust can exist at $0.1$pc from the black hole,…

星系天体物理 · 物理学 2021-04-07 Anton Dorodnitsyn , Tim Kallman

ABRIDGED. The analysis of spectral energy distributions (SEDs) of protoplanetary disks to determine their physical properties is known to be highly degenerate. Hence, a Bayesian analysis is required to obtain parameter uncertainties and…

地球与行星天体物理 · 物理学 2023-04-05 T. Kaeufer , P. Woitke , M. Min , I. Kamp , C. Pinte

An accurate description of interactions between thermal neutrons (below 4 eV) and materials is key to simulate the transport of neutrons in a wide range of applications such as criticality-safety, reactor physics, compact accelerator-driven…

计算物理 · 物理学 2022-01-26 Loic Thulliez , Cédric Jouanne , Eric Dumonteil

We update and extend a previous model by Higdon and Lingenfelter for the longitudinal profile of the N\,II intensity in the Galactic plane. The model is based on four logarithmic spiral arms, to which features like the Local Arm and local…

星系天体物理 · 物理学 2025-03-07 M. Kachelriess , V. Mikalsen

We present results from simulations of the extragalactic polarized sky at 1.4 GHz. As the basis for our polarization models, we use a semi-empirical simulation of the extragalactic total intensity (Stokes I) continuum sky developed at the…

宇宙学与河外天体物理 · 物理学 2009-02-13 S. P. O'Sullivan , J. M. Stil , A. R. Taylor , R. Ricci , J. K. Grant , K. Shorten

The Numerical Advanced Model of Electron Cyclotron Resonance Ion Source (NAM-ECRIS) is applied for studies of the physical processes in the source. Solutions of separately operating electron and ion modules of NAM-ECRIS are matched in…

等离子体物理 · 物理学 2020-08-26 V. Mironov , S. Bogomolov , A. Bondarchenko , A. Efremov , V. Loginov , D. Pugachev

An investigation of the IRAS 16148-5011 region - a cluster at a distance of 3.6 kpc - is presented here, carried out using multiwavelength data in near-infrared (NIR) from the 1.4m Infrared Survey Facility telescope, mid-infrared (MIR) from…

星系天体物理 · 物理学 2015-06-23 K. K. Mallick , D. K. Ojha , M. Tamura , H. Linz , M. R. Samal , S. K. Ghosh

We discuss Hubble Space Telescope optical images and spectra of NGC 6251, a giant E2 galaxy and powerful radio source at a distance of 106 Mpc (for H_0 = 70 km/s/Mpc). The galaxy is known to host a very well defined dust disk (O'Neil et al.…

天体物理学 · 物理学 2009-10-31 Laura Ferrarese , Holland Ford

We present a new software pipeline -- PyMorph -- for automated estimation of structural parameters of galaxies. Both parametric fits through a two dimensional bulge disk decomposition as well as structural parameter measurements like…

天体物理仪器与方法 · 物理学 2015-05-19 Vinu Vikram , Yogesh Wadadekar , Ajit K. Kembhavi , G. V. Vijayagovindan