Información del autor
Autor Gorgas García, Francisco Javier |
Documentos disponibles escritos por este autor (55)
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Evolutionary population synthesis models with different metallicities have been computed in order to interpret the observed Mg_2 and H?, line-strength indices in old stellar populations. Both indices are found to be quite insensitive to change[...]texto impreso
Falcón Barroso, J. ; Sánchez Blázquez, P. ; Vazdekis, A. ; Ricciardelli, E. ; Cardiel López, Nicolás ; Cenarro, A. J. ; Gorgas García, Francisco Javier ; Peletier, R. F. | EDP Sciencies | 2011-08We present a number of improvements to the MILES library and stellar population models. We correct some small errors in the radial velocities of the stars, measure the spectral resolution of the library and models more accurately, and give a bet[...]texto impreso
Toloba, E. ; Sánchez Blázquez, P. ; Gorgas García, Francisco Javier ; Gibson, B. K. | IOP Publishing | 2009-02-01For the first time, we undertake a systematic examination of the nitrogen abundances using the NH3360 feature for a sample of 35 early-type galaxies spanning a range of masses and local environment. The nitrogen-sensitive molecular feature at 33[...]texto impreso
Sánchez Blázquez, Patricia ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Cenarro, J. ; González, J. J. | IOP Publishing | 2003-06-20Central line-strength indices were measured in the blue spectral region for a sample of 98 early-type galaxies in different environments. For most indices (Mg b and [Fe] in particular), elliptical galaxies in rich clusters and in low-density reg[...]texto impreso
Cenarro, A. J. ; Sánchez Blázquez, Patricia ; Cardiel López, Nicolás ; Gorgas García, Francisco Javier | IOP Publishing | 2004-10-20We present measurements of the Ca II triplet and the Ca4227 Lick index for a sample of early-type galaxies in the Coma Cluster, deriving, for the first time, their corresponding relationships with velocity dispersion. Compared with a similar sub[...]texto impreso
Matkovic, A. ; Guzmán, R. ; Sánchez Blázquez, P. ; Cardiel López, Nicolás ; Gorgas García, Francisco Javier | American Institute of Physics | 2009We derive ages, metallicities and [alpha/Fe] ratios for dwarf early-type galaxies (dE/dS0) in the center and a region believed to be infalling into the Coma cluster. We find that a set of metallic indices cannot be described by linear relations [...]texto impreso
Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Pedraz, S. ; González, J. J. | EDP Sciences | 1999-10Empirical fitting functions, describing the behaviour of the ?4000 Å break, D_4000, in terms of effective temperature, metallicity and surface gravity, are presented. For this purpose, the break has been measured in 392 stars from the Lick/IDS L[...]texto impreso
Cenarro, A. J. ; Cardiel López, Nicolás ; Gorgas García, Francisco Javier ; Peletier, R. F. ; Vazdekis, A. ; Prada, F. | Wiley | 2001-09-21A new stellar library at the near-IR spectral region developed for the empirical calibration of the Ca II triplet and stellar population synthesis modelling is presented. The library covers the range lambda lambda 8348-9020 at 1.5-Angstrom (FWHM[...]texto impreso
Cenarro, A. J. ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Pedraz, S. ; Peletier, R. F. ; Vazdekis, A. | Wiley | 2001-09-21We present a homogeneous set of stellar atmospheric parameters (T-eff, log g, [Fe/H]) for a sample of about 700 field and cluster stars which constitute a new stellar library in the near-IR developed for stellar population synthesis in this spec[...]texto impreso
Cenarro, A. J. ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Vazdekis, A. ; Peletier, R. F. | Wiley | 2002-02-01Using a near-infrared stellar library of 706 stars with a wide coverage of atmospheric parameters, we study the behaviour of the Call triplet strength in terms of effective temperature, surface gravity and metallicity. Empirical fitting function[...]texto impreso
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Mármol Queraltó, E. ; Cardiel López, Nicolás ; Sánchez Blázquez, P. ; Trager, S. C. ; Peletier, R. F. ; Kuntschner, H. ; Silva, D. R. ; Cenarro, A. J. ; Vazdekis, A. ; Gorgas García, Francisco Javier | IOP publishing ltd | 2009-11-10The study of stellar populations in early-type galaxies in different environments is a powerful tool for constraining their star formation histories. This study has been traditionally restricted to the optical range, where dwarfs around the turn[...]texto impreso
Pedraz, S. ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Sánchez Blázquez, P. ; Guzmán, R. | Wiley | 2002-05In this letter we investigate the kinematical properties of early-type dwarfs by significantly enlarging the scarce observational sample so far available. We present rotation curves and mean velocity dispersions for four bright dwarf ellipticals[...]texto impreso
Vazdekis, A. ; Sánchez Blázquez, P. ; Falcón Barroso, J. ; Cenarro, A. J. ; Beasley, M. A. ; Cardiel López, Nicolás ; Gorgas García, Francisco Javier ; Peletier, R. F. | Wiley | 2010-06-01We present synthetic spectral energy distributions (SEDs) for single-age, single-metallicity stellar populations (SSPs) covering the full optical spectral range at moderately high resolution [full width at half-maximum (FWHM) = 2.3 A]. These SED[...]texto impreso
Toloba, E. ; Boselli, A. ; Cenarro, A. J. ; Peletier, R. F. ; Gorgas García, Francisco Javier ; Gil de Paz, Armando ; Muñoz Mateos, Juan Carlos | EDP Sciencies | 2011-02We present new medium resolution kinematic data for a sample of 21 dwarf early-type galaxies (dEs) mainly in the Virgo cluster, obtained with the WHT and INT telescopes at the Roque de los Muchachos Observatory (La Palma, Spain). These data are [...]texto impreso
Toloba, E. ; Boselli, A. ; Peletier, R. F. ; Falcón Barroso, J. ; van de Ven, G. ; Gorgas García, Francisco Javier | EDP Sciencies | 2012-12We place our sample of 18 Virgo dwarf early-type galaxies (dEs) on the (V - K)_e-velocity dispersion, Faber-Jackson, and fundamental plane (FP) scaling relations for massive early-type galaxies (Es). We use a generalized velocity dispersion, whi[...]texto impreso
Toloba, E. ; Boselli, A. ; Peletier, R. F. ; Falcón Barroso, J. ; van de Ven, G. ; Gorgas García, Francisco Javier | EDP Sciencies | 2013-09texto impreso
Cacho, R. ; Sánchez Blázquez, Patricia ; Gorgas García, Francisco Javier ; Pérez, I. | Wiley | 2014-08-11Numerical simulations predict that bars represent a very important agent for triggering gas inflows, which in turn could lead to central star formation. Bars thus are thought to contribute to the formation of the bulge. This process changes both[...]texto impreso
Cacho Martínez, Raúl ; Sánchez Blázquez, P. ; Gorgas García, Francisco Javier ; Pérez, I. | Oxford Univ. Press | 2014-08-11Numerical simulations predict that bars represent a very important agent for triggering gas inflows, which in turn could lead to central star formation. Bars thus are thought to contribute to the formation of the bulge.This changes both, the gas[...]texto impreso
Cacho Martínez, Raúl ; Sánchez Blázquez, P. ; Gorgas García, Francisco Javier ; Pérez, I. | Wiley | 2014-08-11Numerical simulations predict that bars represent a very important agent for triggering gas inflows, which in turn could lead to central star formation. Bars thus are thought to contribute to the formation of the bulge. This process changes both[...]texto impreso
Cardiel López, Nicolás ; Gallego Maestro, Jesús ; Pascual Ramírez, Sergio ; Eliche Moral, María del Carmen ; Castillo Morales, África ; Guzmán, R. ; Gil de Paz, Armando ; Pérez González, Pablo Guillermo ; Gorgas García, Francisco Javier ; Zamorano Calvo, Jaime | SPRINGER-VERLAG BERLIN | 2010We present a short summary of the activities developed by GUAIX, the Universidad Complutense de Madrid (UCM) Group of Extragalactic Astrophysics and Astronomical Instrumentation. At present we are focused in the development of data reduction pip[...]texto impreso
Serrano, A. ; Cardiel López, Nicolás ; Gallego Maestro, Jesús ; Balcells, M. ; Prieto, M. ; Cristóbal, D. ; Guzmán, R. ; Pelló, R. ; Gorgas García, Francisco Javier ; Zamorano Calvo, Jaime | Instituto de Astronomía. Universidad Nacional Autónoma de México | 2003As a part of our collaboration in the COSMOS Project, devoted to the characterization of galaxies during the ep o c h of maximum star formation in the history of the Universe, we have carried out a deep photometric survey covering about 380 arcm[...]texto impreso
Matkovic, A. ; Guzmán, R. ; Sánchez Blázquez, P. ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Gruel, N. | IOP Publishing | 2009-02-01We present line-strength measurements for 74 early-type galaxies in the core of the Coma cluster reaching down to velocity dispersions, sigma, of 30 km s(-1). The index-sigma relations for our sample, including galaxies with sigmatexto impreso
Toloba, E. ; Boselli, A. ; Gorgas García, Francisco Javier ; Peletier, R. F. ; Cenarro, A. J. ; Gadotti, D. A. ; Gil de Paz, Armando ; Pedraz, S. ; Yildiz, U. | IOP Publishing | 2009-12-10We present new observational results on the kinematical, morphological, and stellar population properties of a sample of 21 dEs located both in the Virgo Cluster and in the field, which show that 52% of the dEs (1) are rotationally supported, (2[...]texto impreso
Gorgas García, Francisco Javier ; Pedraz, Santos ; Guzmán, Rafael ; Cardiel López, Nicolás ; González, J. J. | IOP Publishing | 1997-05-20We present new measurements of central line-strength indices (namely, Mg-2, (Fe), and H beta) and gradients for a sample of six bright spheroidal (Sph) galaxies in the Virgo Cluster. Comparison with similar measurements for elliptical (E) galaxi[...]