Person: Zamorano Calvo, Jaime
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First Name
Jaime
Last Name
Zamorano Calvo
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de la Tierra y Astrofísica
Area
Astronomía y Astrofísica
Identifiers
6 results
Search Results
Now showing 1 - 6 of 6
Item On the nature of the extragalactic number counts in the K-band(Astronomy & Astrophysics, 2009) Barro, G.; Gallego Maestro, Jesús; Pérez González, Pablo Guillermo; Eliche Moral, María del Carmen; Balcells, M.; Villar, V.; Cardiel López, Nicolás; Cristobal Hornillos, D.; Gil de Paz, Armando; Guzmán, R.; Pello, R.; Prieto, M.; Zamorano Calvo, JaimeContext. The galaxy number counts has been traditionally used to test models of galaxy evolution. However, the origin of significant differences in the shape of number counts at different wavelengths is still unclear. By relating the most remarkable features in the number counts with the underlying galaxy population it is possible to introduce further constraints on galaxy evolution. Aims. We aim to investigate the causes of the different shape of the K-band number counts when compared to other bands, analyzing in detail the presence of a change in the slope around K similar to 17.5. Methods. We present a near-infrared imaging survey, conducted at the 3.5 m telescope of the Calar Alto Spanish-German Astronomical Center (CAHA), covering two separated fields centered on the HFDN and the Groth field, with a total combined area of similar to 0.27 deg(2) to a depth of K similar to 19 (3 sigma, Vega). By combining our data with public deep K-band images in the CDFS (GOODS/ISAAC) and high quality imaging in multiple bands, we extract K-selected catalogs characterized with highly reliable photometric redshift estimates. We derive redshift binned number counts, comparing the results in our three fields to sample the effects of cosmic variance. We derive luminosity functions from the observed K-band in the redshift range [0.25-1.25], that are combined with data from the references in multiple bands and redshifts, to build up the K-band number count distribution. Results. The overall shape of the number counts can be grouped into three regimes: the classic Euclidean slope regime (d log N/dm similar to 0.6) at bright magnitudes; a transition regime at intermediate magnitudes, dominated by M* galaxies at the redshift that maximizes the product phi*dVc/d Omega; and an alpha dominated regime at faint magnitudes, where the slope asymptotically approaches -0.4(alpha + 1) controlled by post-M* galaxies. The slope of the K-band number counts presents an averaged decrement of similar to 50% in the range 15.5 < K < 18.5 (d log N/dm similar to 0.6-0.30). The rate of change in the slope is highly sensitive to cosmic variance effects. The decreasing trend is the consequence of a prominent decrease of the characteristic density phi(K,obs)* (similar to 60% from z = 0.5 to z = 1.5) and an almost flat evolution of M(K,obs)* (1 sigma compatible with M(K,obs)* = -22.89 +/- 0.25 in the same redshift range).Item 3C a multi-wavelength database for the future GTC cosmological surveys(First light science with the GTC, 2007) Barro, G.; Gallego Maestro, Jesús; Villar, V.; Zamorano Calvo, JaimeThe 3C Database aims to provide complete multi-wavelength information over different cosmological fields, such as GOODS, Groth or Sa68 allowing detailed studies on wide samples of galaxies.Item Properties of Hα-selected star-forming galaxies from z ∼ 0.8 to now(II International GTC Workshop: Science with GTC 1st-Light Instruments and the LMT, Gallego Maestro, Jesús y Zamorano Calvo, Jaime y Pascual Ramírez, Sergio y Villar, V. (2005) Emission-line galaxy surveys with GTC: The Hα Universe. In II International GTC Workshop: Science with GTC 1st-Light Instruments and the LMT, 2005) Pascual Ramírez, Sergio; Villar, V.; Gallego Maestro, Jesús; Zamorano Calvo, Jaime; Pelló, R.; Díaz-Guerra Viejo, Carlos; Aragón Salamanca, A.We present a long-term project to study the characteristics and evolution of current star-forming galaxies at different redshifts. Our results support the idea that the higher Star Formation Density measured at redshift z=0.24 is due to an increase of the density of bursting galaxies and not to an intrinsic change on overall galaxy properties.Item The Hα nature of the universe at Z∼0.83(First light science with the GTC, 2007) Villar, V.; Gallego Maestro, Jesús; Pascual Ramírez, Sergio; Zamorano Calvo, Jaime; Noeske, K.; Koo, D.C.We presen there the results of a survey searching for current-star forming galaxies at at z ∼0.83. Objects are selected by their emission in the Hα line through the narrow band filter technique.Item Emission-line galaxy surveys with GTC: The Hα Universe(II International GTC Workshop: Science with GTC 1st-Light Instruments and the LMT, 2005) Gallego Maestro, Jesús; Zamorano Calvo, Jaime; Pascual Ramírez, Sergio; Villar, V.Emission line galaxies are the most easily detected and studied objects in the high redshift Universe. They are being used to trace the evolution of critical observables of the Universe such as Star Formation Rate densities, starburst properties and abundances. Most of the research is being done using [OII]3727 and UV lines, but Hα is still one the best tracers for Star Formation Rate and physical properties of current star-forming galaxies. As a complementary contribution to studies of galaxy evolution, our team has focused into a long-term project to study the population of Hα-selected star-forming galaxies of the Universe at different redshifts. In 1995 we first determined the local Hα luminosity function, and from it the Star Formation Rate density (SFRd) of the local Universe. We then, using narrow-band imaging in the optical, extended this measurement to z ≃ 0.24 and z ≃ 0.4. Working in the near-infrared, GTC will be a very powerful tool to study the evolution of the Hα emission-line galaxy populations at different redshifts. We will both quantify the SFRd evolution and characterize the star-forming galaxy populations by directly comparing the same observables at all redshifts up to z ≃ 2.5.Item Multiwavelength study of star-forming galaxies in the local Universe(II International GTC Workshop: Science with GTC 1st-Light Instruments and the LMT, 2005) Zamorano Calvo, Jaime; Díaz-Guerra Viejo, Carlos; Gallego Maestro, Jesús; Pérez González, Pablo Guillermo; Gil de Paz, Armando; Pascual, S.; Villar, V.; Alonso Herrero, A.; Aragón Salamanca, A.We have studied in detail the properties of local active star-forming galaxies from the UCM survey, and in particular their star-formation histories. We have quantified the relative importance of the current episode of star formation in comparison to the underlying older stellar populations. We have also determined the total stellar mass function and burst mass function for the UCM sample using the M/L calculated for each galaxy. Integrating this mass function we obtained the contribution of the star-forming galaxies to the total stellar mass density of the local Universe.