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200 papers

Context. The modeling of stellar spectra of flux standards observed by the Hubble and James Webb space telescopes requires a large synthetic spectral library that covers a wide atmospheric parameter range. Aims. The aim of this paper is to…

The application of artificial neural networks (ANNs) for the estimation of HI gas mass fraction (\fgas) is investigated, based on a sample of 13,674 galaxies in the Sloan Digital Sky Survey (SDSS) with HI detections or upper limits from the…

Astrophysics of Galaxies · Physics 2016-12-07 Hossen Teimoorinia , Sara L. Ellison , David R. Patton

The knowledge of atmospheric parameters -- such as temperature, pressure, and humidity -- is very important for a proper reconstruction of air showers, especially with the fluorescence technique. The Global Data Assimilation System (GDAS)…

Instrumentation and Methods for Astrophysics · Physics 2019-08-13 Martin Will

ALMA will revolutionize our understanding of star formation within our galaxy, but before we can use ALMA we need to know where to look. The Millimeter Astronomy Legacy Team 90 GHz (MALT90) Survey is a large international project to map the…

Astrophysics of Galaxies · Physics 2013-03-14 Jonathan B. Foster , Jill M. Rathborne , James M. Jackson , Steve N. Longmore , Scott Whitaker , Sadia Hoq

In this work, we investigate the use of Large Language Models (LLMs) within a graph-based Retrieval Augmented Generation (RAG) architecture for Energy Efficiency (EE) Question Answering. First, the system automatically extracts a Knowledge…

We investigate chemical enrichment in Damped Lyman alpha (DLA) systems in the hierarchical structure formation scenario using a semi-analytic model of galaxy formation. The model developed by Nagashima, Totani, Gouda and Yoshii takes into…

Astrophysics · Physics 2009-11-10 Katsuya Okoshi , Masahiro Nagashima , Naoteru Gouda , Satoshi Yoshioka

We present a new version of the GalactICS code that can generate self-consistent equilibrium galaxy models with a two-component stellar disc and a gas disc as well as a centrally-concentrated bulge and extended dark halo. The models can…

Astrophysics of Galaxies · Physics 2019-05-08 N. Deg , L. M. Widrow , T. Randriamampandry , C. Carignan

Aims: ARCiS, a novel code for the analysis of exoplanet transmission and emission spectra is presented. The aim of the modelling framework is to provide a tool able to link observations to physical models of exoplanet atmospheres. Methods:…

Earth and Planetary Astrophysics · Physics 2020-10-07 Michiel Min , Chris W. Ormel , Katy Chubb , Christiane Helling , Yui Kawashima

We apply the spectral energy distribution (SED) fitting code ProSpect to multiwavelength imaging for $\sim$7,000 galaxies from the GAMA survey at $z<0.06$, in order to extract their star formation histories. We combine a parametric…

The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background over 75\% of the sky from the Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220~GHz. This paper…

In recent years new observations of pre-main sequence stars (pre-MS) with Z <= Zsun have been made available. To take full advantage of the continuously growing amount of data of pre-MS stars in different environments, we need to develop…

Solar and Stellar Astrophysics · Physics 2015-05-28 E. Tognelli , P. G. Prada Moroni , S. Degl'Innocenti

We describe state-of-the-art MARCS-code model atmospheres generated for a group of A dwarf, G dwarf, and late-G to mid-K giant standard stars, selected to photometrically calibrate the Spitzer-IRS, and compare the synthetic spectra to…

Astrophysics · Physics 2009-11-10 L. Decin , P. W. Morris , P. N. Appleton , V. Charmandaris , L. Armus , J. R. Houck

Collaboration literacy requires adapting to the evolving demands of group work within complex discussions, making it difficult to develop and assess. Traditional analytics metrics capture behavioral signals while missing the semantic…

Human-Computer Interaction · Computer Science 2026-05-19 Dawei Xie , Khalil Anderson , Tochukwu Eze , Chenghong Lin , Bookyung Shin , Marcelo Worsley

A full-sky template map of the Galactic free-free foreground emission component is increasingly important for high sensitivity CMB experiments. We use the recently published \ha data of both the northern and southern skies as the basis for…

Astrophysics · Physics 2009-11-07 C. Dickinson , R. D. Davies , R. J. Davis

We present a Fortran 95 code for simulating the evolution of astrophysical systems using particles to represent the underlying fluid flow. The code is designed to be versatile, flexible and extensible, with modular options that can be…

Astrophysics · Physics 2009-10-02 M. Wetzstein , Andrew F. Nelson , T. Naab , A. Burkert

Using the theory of collisional line broadening developed by Anstee and O'Mara (1991, 1995) and the spectrum synthesis software developed by John Ross, the abundances of Fe, Mg, Ca and Na in Alpha Centauri A are determined from strong…

Astrophysics · Physics 2007-05-23 Nimish P. Hathi

The Galactic Archaeology with HERMES (GALAH) Survey is a massive observational project to trace the Milky Way's history of star formation, chemical enrichment, stellar migration and minor mergers. Using high-resolution (R$\simeq$28,000)…

This work describes a procedure to derive several fundamental parameters such as the effective temperature, surface gravity, equatorial rotational velocity and microturbulent velocity. In this work, we have written a numerical procedure in…

Solar and Stellar Astrophysics · Physics 2014-07-18 E. Aydi , M. Gebran , R. Monier , F. Royer , A. Lobel , R. Blomme

We present CIGALE (Burgarella et al. 2005; Noll et al. 2009), a software developed at the Laboratoire d'Astrophysique de Marseille to fit galaxy spectral energy distributions from the rest-frame far-UV to far-IR wavelength range, and to…

Cosmology and Nongalactic Astrophysics · Physics 2011-11-07 Yannick Roehlly , Denis Burgarella , Véronique Buat , Élodie Giovannoli , Stefan Noll , Paolo Serra

Gravitational lenses offer the possibility of accurately determining the Hubble parameter (H_0) over cosmological distances, and B0218+357 is one of the most promising systems for an application of this technique. In particular this system…

Astrophysics · Physics 2007-05-23 A. D. Biggs , I. W. A. Browne , T. W. B. Muxlow , P. N. Wilkinson