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Historically, metallicity profiles of galaxies have been modelled using a radially symmetric, two-parameter linear model, which reveals that most galaxies are more metal-rich in their central regions than their outskirts. However, this…

天体物理仪器与方法 · 物理学 2024-03-14 Benjamin Metha , Simon Birrer , Tommaso Treu , Michele Trenti , Xuheng Ding , Xin Wang

This letter presents a revised radiative transfer model for the infrared (IR) emission of active galactic nuclei (AGN). While current models assume that the IR is emitted from a dusty torus in the equatorial plane of the AGN, spatially…

星系天体物理 · 物理学 2017-04-05 Sebastian F. Hönig , Makoto Kishimoto

We present GalSyn (Galaxy Synthesizer), a modular and flexible Python package for generating synthetic spectrophotometric observations from hydrodynamical galaxy simulations. GalSyn employs a particle-by-particle spectral modeling approach…

We uniformly analyze 136 optically detected PNe and candidates from the GLIMPSE-I survey in order to to develop robust, multi-wavelength, classification criteria to augment existing diagnostics and provide pure PN samples. PNe represent…

星系天体物理 · 物理学 2015-05-20 Martin Cohen , Quentin A. Parker , Anne J. Green , Brent Miszalski , David J. Frew , Tara Murphy

As several large single-dish radio surveys begin operation within the coming decade, a wealth of radio data will become available and provide a new window to the Universe. In order to fully exploit the potential of these data sets, it is…

天体物理仪器与方法 · 物理学 2017-01-16 Joel Akeret , Sebastian Seehars , Chihway Chang , Christian Monstein , Adam Amara , Alexandre Refregier

Some of the most successful statistical methods for obtaining distances of planetary nebulae (PNe) are based on their apparent sizes and radio emission intensities. These methods have the advantage of being "extinction-free" and are…

星系天体物理 · 物理学 2015-05-30 R. Ortiz , M. V. F. Copetti , S. Lorenz-Martins

In addition to its potential to probe the Inflationary cosmological paradigm, millimeter-wave polarimetry is a powerful tool for studying the Milky Way galaxy's composition and magnetic field structure. Towards this end, presented here are…

We perform a consistent modeling of cosmic ray electrons, positrons and of the radio emission of the Galaxy. For the time we reproduce all relevant data sets between 1 GeV and 1 TeV including the recent AMS-02 positron fraction results. We…

高能天体物理现象 · 物理学 2013-07-01 D. Grasso , G. Di Bernardo , C. Evoli , D. Gaggero , L. Maccione

We present the Neutron Scattered Spectra Tool (NeSST), an open-source Python package for rapidly constructing primary and singly scattered neutron spectra from inertial confinement fusion (ICF) implosions. NeSST evaluates primary spectra…

等离子体物理 · 物理学 2026-05-26 Aidan Crilly

We present an overview of PION, an open-source software project for solving radiation-magnetohydrodynamics equations on a nested grid, aimed at modelling asymmetric nebulae around massive stars. A new implementation of hybrid OpenMP/MPI…

We present a new algorithm to reconstruct the Galactic free electron density from pulsar dispersion measures. The algorithm performs a nonparametric tomography for a density field with an arbitrary amount of degrees of freedom. It is based…

星系天体物理 · 物理学 2016-05-11 Maksim Greiner , Dominic H. F. M. Schnitzeler , Torsten A. Ensslin

The Python Sky Model (PySM) is a Python package used by Cosmic Microwave Background (CMB) experiments to simulate maps, in HEALPix pixelization, of the various diffuse astrophysical components of Galactic emission relevant at CMB…

天体物理仪器与方法 · 物理学 2021-11-03 Andrea Zonca , Ben Thorne , Nicoletta Krachmalnicoff , Julian Borrill

We present a new joint analysis of pulsar dispersion measures and diffuse H-alpha emission in the Milky Way, which we use to derive the density, pressure and filling factor of the thick disk component of the warm ionised medium (WIM) as a…

天体物理学 · 物理学 2009-11-13 B. M. Gaensler , G. J. Madsen , S. Chatterjee , S. A. Mao

We use planetary nebulae (PNe) as probes to determine the Galactic radial oxygen gradients, and other abundance patterns. We select data homogeneously from recent data sets, including PNe at large Galactocentric distances. The radial oxygen…

星系天体物理 · 物理学 2018-08-08 Letizia Stanghellini , Misha Haywood

The dynamical evolution and radiative properties of luminous radio galaxies and quasars of the FRII type, are well understood. As a result, through the use of detailed modeling of the observed radio emission of such sources, one can…

星系天体物理 · 物理学 2021-12-08 Anna Wojtowicz , Lukasz Stawarz , Jerzy Machalski , Luisa Ostorero

We present a new approach in modelling the polarized Galactic synchrotron emission in the microwave range (20-100 GHz), where this radiation is expected to play the leading role in contaminating the Cosmic Microwave Background (CMB) data.…

天体物理学 · 物理学 2009-11-07 G. Bernardi , E. Carretti , R. Fabbri , C. Sbarra , S. Poppi , S. Cortiglioni

We have developed a technique to map the three-dimensional structure of the local interstellar medium using a maximum entropy reconstruction technique. A set of column densities N to stars of known distance can in principle be used to…

天体物理学 · 物理学 2009-10-31 John S. Arabadjis , Joel N. Bregman

Neutral hydrogen (HI) is the fundamental component of the interstellar medium. The Galactic Plane Pulsar Snapshot (GPPS) survey is designed for hunting pulsars by using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) from…

星系天体物理 · 物理学 2022-12-01 Tao Hong , J. L. Han , L. G. Hou , X. Y. Gao , Chen Wang , Tao Wang

The distribution of metals in the Galaxy provides important information about galaxy formation and evolution. HII regions are the most luminous objects in the Milky Way at mid-infrared to radio wavelengths and can be seen across the entire…

星系天体物理 · 物理学 2015-05-28 Dana S. Balser , Robert T. Rood , T. M. Bania , L. D. Anderson