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Oct 28, 2024 | 
aanda.org | Mauricio Ramirez |Instituto de Astrofísica |Departamento de Física |Universidad Andres Bello
Home All issues Volume 691 (November 2024) A&A, 691 (2024) A33 Full HTML Issue A&A Volume 691, November 2024 Article Number A33 Number of page(s) 15 Section Numerical methods and codes DOI https://doi.org/10.1051/0004-6361/202449170 Published online 25 October 2024 A&A, 691, A33 (2024) A novel optimal transport-based approach for interpolating spectral time series 1,2★, 3,2, 2,4,5,6, 7, 10,11, 1,2, 2,12,13, 2,8,9, 2,5 and 1,2 1 Instituto de Astrofisica, Departamento de Fisica, Facultad de...
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Sep 26, 2024 | 
aanda.org | R. Saito |Departamento de Física |M. Hempel |Instituto de Astrofísica
Home All issues Volume 689 (September 2024) A&A, 689 (2024) A148 Full HTML Issue A&A Volume 689, September 2024 Article Number A148 Number of page(s) 19 Section Catalogs and data DOI https://doi.org/10.1051/0004-6361/202450584 Published online 26 September 2024 A&A, 689, A148 (2024) The VISTA Variables in the Vía Láctea extended (VVVX) ESO public survey: Completion of the observations and legacy★ 1, 2,3, 4,5, 6, 2,7,1, 8, 9,10, 11,12, 2, 13, 14, 8, 15, 2, 16, 11,12, 17, 18, 19, 2, 16, 20, 21,...
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Aug 1, 2024 | 
academic.oup.com | Instituto de Astrofísica |Santiago Chile |Facultad de Ciencias |Universidad de Valparaíso
NGC 6357, a star-forming complex at ∼1.7 kpc from the Sun, contains giant molecular clouds and three prominent star clusters alongside HII regions, very massive stars and thousands of young stellar objects in different evolutionary stages. We present a combined infrared kinematic and time domain study of the line of sight towards this region enabled by the VVVX survey. In terms of kinematics, a novel discovery emerges: an asymmetrical distribution in the vector point diagram.
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Aug 1, 2024 | 
academic.oup.com | Instituto de Astrofísica |Facultad de Ciencias |Universidad de Valparaíso |Departamento de Ciencias
The study of different star-forming regions and their stellar populations, as well as the reconstruction of their star formation history and structure need astrometric and kinematic data with the lowest levels of uncertainty possible. Thanks to the Gaia satellite (Gaia Collaboration et al.
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Jun 8, 2024 | 
academic.oup.com | Konkoly Observatory |ELTE Eötvös Loránd |Instituto de Astrofísica |Universidad Andres Bello
Long gamma-ray bursts (LGRBs) with1T ≳ 2 s (Kouveliotou et al. 1993) are thought to emerge from the death of rapidly rotating, metal-poor, and massive stars (e.g. Wolf–Rayet; Woosley 1993; Woosley, Heger & Weaver 2002; Piran 2004; Zhang, Woosley & Heger 2004; Maeder & Meynet 2012; Zhang 2019).
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Dec 19, 2023 | 
academic.oup.com | Instituto de Astronomia |Departamento de Física |Instituto de Astrofísica |Universidad Andres Bello
Binary systems involving a white dwarf (WD) and a companion of extremely low-mass, such as an ultracool dwarf (UCD) or brown dwarf (BD), present a unique opportunity to investigate the evolution of low-mass stars and substellar objects. The working definition and distinction between BDs (|$T_{\rm eff}~\le ~2200~\mathrm{ K}$|), and UCDs (|$T_{\rm eff}~\le ~2700~\mathrm{ K}$|) are based on their masses and temperatures.
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Dec 18, 2023 | 
academic.oup.com | Observatorio Astronómico |Cidade Universitária |Instituto de Astrofísica |Universidad Andres Bello
The structure of the Small Magellanic Cloud (SMC) outside of its main body is characterised by tidal branches resulting from its interactions mainly with the Large Magellanic Cloud (LMC). Characterising the stellar populations in these tidal components helps to understand the dynamical history of this galaxy and of the Magellanic system in general. We provide full phase-space vector information for Southern Bridge clusters.
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Oct 6, 2023 | 
academic.oup.com | Liverpool John Moores |Fort Worth |Instituto de Astrofísica |Universidad Andres Bello
Globular clusters (GCs) are intriguing objects. The physics of their genesis is not entirely understood, yet their study has advanced knowledge in several fields of astrophysics.
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Jul 27, 2023 | 
academic.oup.com | Facultad de Ingeniería |Universidad Santo Tomas |Luis Felipe |Instituto de Astrofísica
In recent years, the astronomical scientific community has made significant efforts to automate quasars’ detection. Automatic classification of these objects is challenging since they are very distant and appear as point sources, outnumbered by other sources. Thus, performing automatic morphological classification is not straightforward; colour dimension seems better as a key concept.
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Jul 13, 2023 | 
academic.oup.com | Instituto de Astrofísica
Using data from TNG300-2, we train a neural network (NN) to recreate the stellar mass (M*) and star formation rate (SFR) of central Galaxies in a dark-matter-only simulation. We conider 12 input properties from the halo and sub-halo hosting the galaxy and the near environment. M* predictions are robust, but the machine does not fully reproduce its scatter. The same happens for SFR, but the predictions are not as good as for M*. We chained NNs, improving the predictions on SFR to some extent.
