Subvenciones relacionadas:
General
Nuestro grupo pequeño esta bien conocido y respetado internacionalmente por nuestro trabajo inovativo e importante en varios aspectos de la estructura y la evolución de las galaxias espirales cercanas. Usamos principalmente observaciones en varias longitudes de onda, explotando las sinergías que nos permiten responder a las cuestiones más pertinentes sobre las propiedades principales de las galaxias, y cómo las galaxias han evolucionado hasta su actual estatus. Usamos imagenes y espectroscopía, en el ultravioleta, óptico, infrarrojo, milimétrico y radio, usando al máximo las facilidades de observación a nuestra disposición en España, en la ESO y en otros sitios, combinando los datos con herramientas de análisis modernas. El éxito de esta forma de trabajar se puede medir de las oportunidades de trabajo que se presentan a los que fueron miembros del grupo, del número y de la calidad de las colaboraciones con científicos importantes, de las citas a nuestro trabajo, y de las invitaciones para organizar o hablar en los congresos más importantes en el campo.
En los últimos años nuestro grupo ha puesto mucho énfasis en abrir nuevas lineas de investigación conjuntas con informáticos, considerando el cambio de paradigma que está por venir debido a las enormes cantidades de datos que pronto producirán telescopios como LSST, Euclid, y SKA. Colaboramos con informáticos en la preparación de herramientas de análisis, incluyendo para la detección de estructura a partir del ruido, la corrección para la luz dispersa y el cirro de nuestra Vía Láctea, y el uso de técnicas basadas en machine learning. Así, una vez los telescopios LSST (2020) y Euclid (2023) empiezan a producir sus juegos de datos enormes, nuestro grupo estará preparado para analizarlos y extraer la ciencia.
Miembros
Resultados
- A partir de mapas térmicos y non-térmicos en radio del centro de NGC 1097 hemos descubierto que la formación de estrellas masivas se apaga por efectos non-térmicos, incluido la presión del campo magnético, rayos cósmicos y turbulencia.
- En el centro de NGC 7742 hemos detectado un disco interno y dos componentes estelares: una población vieja que contra-rota con el gas, y una joven, concentrado en un anillo, que rota con el gas.
- Hemos re-analizadas nuestras imágenes profundas IR de discos gruesos para corregir por el point spread function (PSF) extendido, confirmando todos nuestros previos resultados y en particular confirmando la presencia de una masa significativa en el componente del disco grueso.
- Analizando un mapa nuevo a alta resolución en el radio continuo a 1.5 GHz de e-Merlin, junto con imágenes de HST y SDSS de NGC 5322, una galaxia elíptica que contiene chorros en radio, hemos encontrado que un chorro de baja luminosidad puede haber acabado con la formación estelar en el nucleo.
- A partir de observaciones con MUSE de la emisión Lyman-α a bajo brillo superficial alrededor de galaxias débiles a redshifts entre 3 y 6 hemos encontrado que la cobertura proyectoada en el cielo se aproxima al 100%.
Actividad científica
Publicaciones relacionadas
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WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan's QuintetWe present a detailed study of the large-scale shock front in Stephan's Quintet, a by-product of past and ongoing interactions. Using integral-field spectroscopy from the new William Herschel Telescope Enhanced Area Velocity Explorer (WEAVE), recent 144 MHz observations from the LOFAR Two-metre Sky Survey, and archival data from the Very LargeArnaudova, M. I. et al.
Fecha de publicación:
122024 -
Gas flows in the central region of the Seyfert galaxy NGC 4593 with MUSEContext. Understanding how gas flows into galactic centres, fuels the active galactic nucleus (AGN), and is in turn expelled back through feedback processes is of great importance to appreciate the role AGN play in the growth and evolution of galaxies. Aims. We use Multi Unit Spectroscopic Explorer-adaptive optics (MUSE-AO) optical spectra of theBaki, P. et al.
Fecha de publicación:
102024 -
Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learningContext. The William Herschel Telescope Enhanced Area Velocity Explorer (WEAVE) is a new, massively multiplexing spectrograph that allows us to collect about one thousand spectra over a 3 square degree field in one observation. The WEAVE Stellar Population Survey (WEAVE-StePS) in the next 5 years will exploit this new instrument to obtain high-S/NAngthopo, J. et al.
Fecha de publicación:
102024 -
Euclid preparation: XLIII. Measuring detailed galaxy morphologies for Euclid with machine learningThe Euclid mission is expected to image millions of galaxies at high resolution, providing an extensive dataset with which to study galaxy evolution. Because galaxy morphology is both a fundamental parameter and one that is hard to determine for large samples, we investigate the application of deep learning in predicting the detailed morphologiesEuclid Collaboration et al.
Fecha de publicación:
92024 -
Gas-phase metallicity for the Seyfert galaxy NGC 7130Metallicity measurements in galaxies can provide valuable clues about galaxy evolution. One of the mechanisms postulated for metallicity redistribution in galaxies is gas flows induced by active galactic nuclei (AGNs), but the details of this process remain elusive. We report the discovery of a positive radial gradient in the gas-phase metallicityAmiri, A. et al.
Fecha de publicación:
92024 -
Deriving the star formation histories of galaxies from spectra with simulation-based inferenceHigh-resolution galaxy spectra encode information about the stellar populations within galaxies. The properties of the stars, such as their ages, masses, and metallicities, provide insights into the underlying physical processes that drive the growth and transformation of galaxies over cosmic time. We explore a simulation-based inference (SBI)Iglesias-Navarro, Patricia et al.
Fecha de publicación:
92024 -
LeMMINGs. Multiwavelength constraints on the co-existence of nuclear star clusters and AGN in nucleated galaxiesThe relation between nuclear star clusters (NSCs) and the growth of the central supermassive black holes (SMBHs), as well as their connection to the properties of the host galaxies, is crucial for understanding the evolution of galaxies. Recent observations have revealed that about 10 per cent of nucleated galaxies host hybrid nuclei, consisting ofDullo, B. T. et al.
Fecha de publicación:
82024 -
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementationWEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFUJin, Shoko et al.
Fecha de publicación:
52024 -
Bar properties as a function of wavelength: a local baseline with S<SUP>4</SUP>G for high-redshift studiesThe redshift evolution of bars is an important signpost of the dynamic maturity of disc galaxies. To characterize the intrinsic evolution safe from band-shifting effects, it is necessary to gauge how bar properties vary locally as a function of wavelength. We investigate bar properties in 16 nearby galaxies from the Spitzer Survey of StellarMenéndez-Delmestre, Karín et al.
Fecha de publicación:
22024 -
Detection of an intranight optical hard lag with colour variability in blazar PKS 0735+178Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight variability remains a debated phenomenon, with various mechanisms proposed to explain the behaviour including jet energy density evolution or system geometric changes. We present the results of anMcCall, Callum et al.
Fecha de publicación:
32024 -
Strategies for optimal sky subtraction in the low surface brightness regimeThe low surface brightness (LSB) regime (μ g ≳ 26 mag arcsec -2) comprises a vast, mostly unexplored discovery space, from dwarf galaxies to the diffuse interstellar medium. Accessing this regime requires precisely removing instrumental signatures and light contamination, including, most critically, night sky emission. This is not trivial, as faintWatkins, Aaron E. et al.
Fecha de publicación:
32024 -
Preparing for low surface brightness science with the Vera C. Rubin Observatory: a comparison of observable and simulated intracluster light fractionsIntracluster light (ICL) provides an important record of the interactions galaxy clusters have undergone. However, we are limited in our understanding by our measurement methods. To address this, we measure the fraction of cluster light that is held in the Brightest Cluster Galaxy and ICL (BCG+ICL fraction) and the ICL alone (ICL fraction) usingBrough, Sarah et al.
Fecha de publicación:
22024 -
Constraining the top-light initial mass function in the extended ultraviolet disk of M 83Context. The universality or non-universality of the initial mass function (IMF) has significant implications for determining star formation rates and star formation histories from photometric properties of stellar populations. Aims: We reexamine whether the IMF is deficient in high-mass stars (top-light) in the low-density environment of the outerRautio, R. P. V. et al.
Fecha de publicación:
12024 -
On the Nature of Disks at High Redshift Seen by JWST/CEERS with Contrastive Learning and Cosmological SimulationsVisual inspections of the first optical rest-frame images from JWST have indicated a surprisingly high fraction of disk galaxies at high redshifts. Here, we alternatively apply self-supervised machine learning to explore the morphological diversity at z ≥ 3. Our proposed data-driven representation scheme of galaxy morphologies, calibrated on mockVega-Ferrero, Jesús et al.
Fecha de publicación:
12024 -
A giant thin stellar stream in the Coma Galaxy ClusterThe study of dynamically cold stellar streams reveals information about the gravitational potential where they reside and provides important constraints on the properties of dark matter. However, the intrinsic faintness of these streams makes their detection beyond Local environments highly challenging. Here, we report the detection of an extremelySánchez-Alarcón, Pablo M. et al.
Fecha de publicación:
112023 -
Composite Bulges. III. A Study of Nuclear Star Clusters in Nearby Spiral GalaxiesWe present photometric and morphological analyses of nuclear star clusters (NSCs)-very dense, massive star clusters present in the central regions of most galaxies-in a sample of 33 massive disk galaxies within 20 Mpc, part of the "Composite Bulges Survey." We use data from the Hubble Space Telescope including optical (F475W and F814W) and near-IRAshok, Aishwarya et al.
Fecha de publicación:
112023 -
The truncation of the disk of NGC 4565. Detected up to z = 4 kpc, with star formation, and affected by the warpContext. The hierarchical model of galaxy formation suggests that galaxies are continuously growing. However, our position inside the Milky Way prevents us from studying the disk edge. Truncations are low surface brightness features located in the disk outskirts of external galaxies. They indicate where the disk brightness abruptly drops, and theirMartínez-Lombilla, Cristina et al.
Fecha de publicación:
102023 -
Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePSContext. The upcoming generation of optical spectrographs on four meter-class telescopes, with their huge multiplexing capabilities, excellent spectral resolution, and unprecedented wavelength coverage, will provide high-quality spectra for thousands of galaxies. These data will allow us to examine of the stellar population properties atDitrani, F. R. et al.
Fecha de publicación:
92023 -
The AMIGA sample of isolated galaxies. XIV. Disc breaks and interactions through ultra-deep optical imagingContext. In the standard cosmological model of galaxy evolution, mergers and interactions play a fundamental role in shaping galaxies. Galaxies that are currently isolated are thus interesting because they allow us to distinguish between internal and external processes that affect the galactic structure. However, current observational limits maySánchez-Alarcón, P. M. et al.
Fecha de publicación:
92023 -
A brief review of contrastive learning applied to astrophysicsReliable tools to extract patterns from high-dimensionality spaces are becoming more necessary as astronomical data sets increase both in volume and complexity. Contrastive Learning is a self-supervised machine learning algorithm that extracts informative measurements from multidimensional data sets, which has become increasingly popular in theHuertas-Company, Marc et al.
Fecha de publicación:
12023
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