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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Breaks in Thin and Thick Disks of Edge-on Galaxies Imaged in the Spitzer Survey Stellar Structure in Galaxies (S4G)
Breaks in the radial luminosity profiles of galaxies have until now been mostly studied averaged over disks. Here, we study separately breaks in thin and thick disks in 70 edge-on galaxies using imaging from the Spitzer Survey of Stellar Structure in Galaxies. We built luminosity profiles of the thin and thick disks parallel to midplanes and we
Comerón, Sébastien et al.Fecha de publicación:
112012 -
Unveiling the Nature of M94's (NGC4736) Outer Region: A Panchromatic Perspective
We have conducted a deep multiwavelength analysis (0.15-160 μm) to study the outer region of the nearby galaxy M94. We show that the non-optical data support the idea that the outskirts of this galaxy are not formed by a closed stellar ring (as traditionally claimed in the literature) but by a spiral arm structure. In this sense, M94 is a good
Trujillo, I. et al.Fecha de publicación:
102009 -
Thick Disks of Edge-on Galaxies Seen through the Spitzer Survey of Stellar Structure in Galaxies (S4G): Lair of Missing Baryons?
Most, if not all, disk galaxies have a thin (classical) disk and a thick disk. In most models thick disks are thought to be a necessary consequence of the disk formation and/or evolution of the galaxy. We present the results of a study of the thick disk properties in a sample of carefully selected edge-on galaxies with types ranging from T = 3 to T
Comerón, Sébastien et al.Fecha de publicación:
112011 -
The Unusual Vertical Mass Distribution of NGC 4013 Seen through the Spitzer Survey of Stellar Structure in Galaxies (S4G)
NGC 4013 is a nearby Sb edge-on galaxy known for its "prodigious" H I warp and its "giant" tidal stream. Previous work on this unusual object shows that it cannot be fitted satisfactorily by a canonical thin+thick disk structure. We have produced a new decomposition of NGC 4013, considering three stellar flattened components (thin+thick disk plus
Comerón, Sébastien et al.Fecha de publicación:
92011 -
The Thick Disk in the Galaxy NGC 4244 from S4G Imaging
If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies that have evolved during a significant fraction of a Hubble time should have a thick disk. The late-type spiral galaxy NGC 4244 has been reported as the only nearby edge-on galaxy without a confirmed thick disk. Using
Comerón, S. et al.Fecha de publicación:
32011 -
The S4G Perspective on Circumstellar Dust Extinction of Asymptotic Giant Branch Stars in M100
We examine the effect of circumstellar dust extinction on the near-IR (NIR) contribution of asymptotic giant branch (AGB) stars in intermediate-age clusters throughout the disk of M100. For our sample of 17 AGB-dominated clusters we extract optical-to-mid-IR spectral energy distributions (SEDs) and find that NIR brightness is coupled to the mid-IR
Meidt, Sharon E. et al.Fecha de publicación:
42012 -
The JCMT Nearby Galaxies Legacy Survey. VI. The distribution of gas and star formation in M 81
We present the first complete 12CO J = 3-2 map of M 81, observed as part of the Nearby Galaxies Legacy Survey being carried out at the James Clerk Maxwell Telescope. We detect nine regions of significant CO emission located at different positions within the spiral arms, and confirm that the global CO emission in the galaxy is low. We combine these
Sánchez-Gallego, J. R. et al.Fecha de publicación:
32011 -
The JCMT Nearby Galaxies Legacy Survey - VIII. CO data and the LCO(3-2)-LFIR correlation in the SINGS sample
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey (NGLS) comprises an H I-selected sample of 155 galaxies spanning all morphological types with distances less than 25 Mpc. We describe the scientific goals of the survey, the sample selection and the observing strategy. We also present an atlas and analysis of the CO J=3 - 2 maps for
Wilson, C. D. et al.Fecha de publicación:
82012 -
The JCMT Nearby Galaxies Legacy Survey - VII. Hα imaging and massive star formation properties
We present Hα fluxes, star formation rates (SFRs) and equivalent widths (EWs) for a sample of 156 nearby galaxies observed in the 12CO J= 3-2 line as part of the James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. These are derived from images and values in the literature and from new Hα images for 72 galaxies which we publish here. We
Sánchez-Gallego, J. R. et al.Fecha de publicación:
62012 -
The JCMT Nearby Galaxies Legacy Survey - V. The CO(J= 3-2) distribution and molecular outflow in NGC 4631
We have made the first map of CO(J= 3-2) emission covering the disc of the edge-on galaxy, NGC 4631, which is known for its spectacular gaseous halo. The strongest emission, which we model with a Gaussian ring, occurs within a radius of 5 kpc. Weaker disc emission is detected out to radii of 12 kpc, the most extensive molecular component yet seen
Irwin, Judith A. et al.Fecha de publicación:
12011 -
The JCMT Nearby Galaxies Legacy Survey - IV. Velocity dispersions in the molecular interstellar medium in spiral galaxies
An analysis of large-area CO J= 3-2 maps from the James Clerk Maxwell Telescope for 12 nearby spiral galaxies reveals low velocity dispersions in the molecular component of the interstellar medium. The three lowest luminosity galaxies show a relatively flat velocity dispersion as a function of radius while the remaining nine galaxies show a central
Wilson, C. D. et al.Fecha de publicación:
12011 -
The JCMT Nearby Galaxies Legacy Survey - III. Comparisons of cold dust, polycyclic aromatic hydrocarbons, molecular gas and atomic gas in NGC 2403
We used Spitzer Space Telescope 3.6, 8.0, 70 and 160μm data, James Clerk Maxwell Telescope HARP-B CO J = (3-2) data, National Radio Astronomy Observatory 12 m telescope CO J = (1-0) data and Very Large Array HI data to investigate the relations among polycyclic aromatic hydrocarbons (PAHs), cold (~20K) dust, molecular gas and atomic gas within NGC
Bendo, G. J. et al.Fecha de publicación:
32010 -
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. II. Warm Molecular Gas and Star Formation in Three Field Spiral Galaxies
We present the results of large-area 12CO J = 3-2 emission mapping of three nearby field galaxies, NGC 628, NGC 3521, and NGC 3627, completed at the James Clerk Maxwell Telescope as part of the Nearby Galaxies Legacy Survey. These galaxies all have moderate to strong 12CO J = 3-2 detections over large areas of the fields observed by the survey
Warren, B. E. et al.Fecha de publicación:
52010 -
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. I. Star-Forming Molecular Gas in Virgo Cluster Spiral Galaxies
We present large-area maps of the CO J = 3-2 emission obtained at the James Clerk Maxwell Telescope for four spiral galaxies in the Virgo Cluster. We combine these data with published CO J = 1-0, 24 μm, and Hα images to measure the CO line ratios, molecular gas masses, and instantaneous gas depletion times. For three galaxies in our sample (NGC
Wilson, C. D. et al.Fecha de publicación:
32009 -
The Hα Galaxy Survey. VIII. Close Companions and Interactions, and the Definition of Starbursts
We consider the massive star formation properties, radial profiles, and atomic gas masses of those galaxies in our Hα Galaxy Survey that have close companion galaxies, in comparison with a matched control sample of galaxies without companions. Our analysis is based on Hα and continuum images of 327 disk galaxies that form a representative sample of
Knapen, Johan H. et al.Fecha de publicación:
62009 -
The Hα galaxy survey. VII. The spatial distribution of star formation within disks and bulges
Aims: We analyse the current build-up of stellar mass within the disks and bulges of nearby galaxies through a comparison of the spatial distributions of forming and old stellar populations. Methods: Hα and R-band imaging are used to determine the distributions of young and old stellar populations in 313 S0a-Im field galaxies out to ~40 Mpc
James, P. A. et al.Fecha de publicación:
72009 -
The Hα Galaxy survey. IV. Star formation in the local Universe
Aims: We present an analysis of the star formation properties of field galaxies within the local volume out to a recession velocity limit of 3000 km s-1. Methods: A parent sample of 863 star-forming galaxies is used to calculate a B-band luminosity function. This is then populated with star formation information from a subsample of 327 galaxies
James, P. A. et al.Fecha de publicación:
52008 -
Spectroscopy of the archetype colliding-wind binary WR 140 during the 2009 January periastron passage
We present the results from the spectroscopic monitoring of WR 140 (WC7pd + O5.5fc) during its latest periastron passage in 2009 January. The observational campaign consisted of a constructive collaboration between amateur and professional astronomers. It took place at six locations, including Teide Observatory, Observatoire de Haute Provence
Fahed, R. et al.Fecha de publicación:
112011 -
Reconstructing the Stellar Mass Distributions of Galaxies Using S4G IRAC 3.6 and 4.5 μm Images. I. Correcting for Contamination by Polycyclic Aromatic Hydrocarbons, Hot Dust, and Intermediate-age Stars
With the aim of constructing accurate two-dimensional maps of the stellar mass distribution in nearby galaxies from Spitzer Survey of Stellar Structure in Galaxies 3.6 and 4.5 μm images, we report on the separation of the light from old stars from the emission contributed by contaminants. Results for a small sample of six disk galaxies (NGC 1566
Meidt, Sharon E. et al.Fecha de publicación:
12012 -
Photometric scaling relations of lenticular and spiral galaxies
Photometric scaling relations are studied for S0 galaxies and compared with those obtained for spirals. New two-dimensional multi-component decompositions are presented for 122 early-type disc galaxies, using deep Ks-band images. Combining them with our previous decompositions, the final sample consists of 175 galaxies (Near-Infrared Survey of S0s
Laurikainen, E. et al.Fecha de publicación:
62010
