Circumnuclear Regions of Star Formation in Early Type Galaxies (2008)
Diaz, Angeles I., Terlevich, Elena, Hagele, Guillermo F., Castellanos, Marcelo
Circumnuclear star forming regions, also called hotspots, are often found in the inner regions of some spiral galaxies where intense processes of star formation are taking place. In the UV, massive...
Properties of the ionized gas of circumnuclear star-forming regions in early type spirals (2008)
Diaz, Angeles I., Hagele, Guillermo F., Terlevich, Elena, Terlevich, Roberto
(Abbr.) A study of cicumnuclear star-forming regions (CNSFRs) in several early type spirals has been made in order to investigate their main properties: stellar and gas kinematics, dynamical masses,...
Kinematics of gas and stars in circumnuclear star-forming regions of early type spirals (2008)
Hagele, Guillermo F., Diaz, Angeles I., Cardaci, Monica V., Terlevich, Elena, Terlevich, Roberto
(Abbr.) We present high resolution (R~20000) spectra in the blue and the far red of cicumnuclear star-forming regions (CNSFRs) in three early type spirals (NGC3351, NGC2903 and NGC3310) which have...
Precision abundance analysis of bright HII galaxies (2007)
Hagele, Guillermo F., Diaz, Angeles I., Terlevich, Elena, Terlevich, Roberto, Perez-Montero, Enrique, Cardaci, Monica V.
We present high signal-to-noise spectrophotometric observations of seven luminous HII galaxies. The observations have been made with the use of a double-arm spectrograph which provides spectra with a...
Diaz, Angeles I., Terlevich, Elena, Castellanos, Marcelo, Hagele, Guillermo F.
We have obtained long-slit observations in the optical and near infrared of 12 circumnuclear HII regions (CNSFR) in the early type spiral galaxies NGC 2903, NGC 3351 and NGC 3504 with the aim of...
Rosa-Gonzalez, Daniel, Burgarella, Denis, Nandra, Kirpal, Kunth, Daniel, Terlevich, Elena, Terlevich, Roberto
We have combined multi-wavelength observations of a selected sample of starforming galaxies with galaxy evolution models in order to compare the results obtained for different SFR tracers and to...
Kinematics of gas and stars in the circumnuclear starforming ring of NGC 3351 (2007)
Hagele, Guillermo F., Diaz, Angeles I., Cardaci, Monica V., Terlevich, Elena, Terlevich, Roberto
We have measured gas and stellar velocity dispersions in 5 circumnuclear starforming regions (CNSFRs) and the nucleus of the barred spiral galaxy NGC 3351. The stellar dispersions have been obtained...
Probing Cosmological Parameters with H II Galaxies and the new generation telescopes (2006)
Elena Terlevich, Jorge Melnick, Roberto Terlevich
Probing Cosmological Parameters with H II Galaxies and the new generation telescopes
Probing cosmological parameters with H II galaxies (2006)
Elena Terlevich, Jorge Melnick, Roberto Terlevich
Probing cosmological parameters with H II galaxies
Haegele, Guillermo F., Perez-Montero, Enrique, Diaz, Angeles I., Terlevich, Elena, Terlevich, Roberto
We propose a methodology to perform a self-consistent analysis of the physical properties of the emitting gas of HII galaxies adequate to the data that can be obtained with the XXI century...
Marcelo Castellanos, Angeles I. Díaz, Elena Terlevich
Acomprehensive study of high metallicity giant extragalactic h ii regions: chemical abundances
Emission Line Properties of Seyfert 2 Nuclei (2005)
Gu, Qiusheng, Melnick, Jorge, Fernandes, Roberto Cid, Kunth, Daniel, Terlevich, Elena, Terlevich, Roberto
We present a study of the global properties of Joguet's sample of 65 Seyfert 2 galaxies. We use the population synthesis models of our Paper II to derive `pure' emission-line spectra, and thus...
An Active Instance-based Machine Learning method for Stellar Population Studies (2005)
Solorio, Thamar, Fuentes, Olac, Terlevich, Roberto, Terlevich, Elena
We have developed a method for fast and accurate stellar population parameters determination in order to apply it to high resolution galaxy spectra. The method is based on an optimization technique...
Group, field and isolated early-type galaxies II. Global trends from nuclear data (2004)
Denicolo, Glenda, Terlevich, Roberto, Terlevich, Elena, Forbes, Duncan A., Terlevich, Alejandro
We have derived ages, metallicities and enhanced-element ratios [alpha/Fe] for a sample of 83 early-type galaxies essentially in groups, the field or isolated objects. The stellar population...
Group, field and isolated early-type galaxies I. Observations and nuclear data (2004)
Denicolo, Glenda, Terlevich, Roberto, Terlevich, Elena, Forbes, Duncan, Terlevich, Alejandro, Carrasco, Luis
This is the first paper of a series on the investigation of stellar population properties and galaxy evolution of an observationally homogeneous sample of early-type galaxies in groups, field and...
Structural parameters of nearby emission-line galaxies (2004)
Sanchez-Portal, Miguel, Diaz, Angeles I, Terlevich, Elena, Terlevich, Roberto
We present the results of an investigation on the main structural properties derived from VRI and Halpha surface photometry of galaxies hosting nuclear emission-line regions (including Seyfert 1,...
Solorio, Thamar, Fuentes, Olac, Terlevich, Roberto, Terlevich, Elena, Bressan, Sandro
In this work we focus on the determination of the relative distributions of young, intermediate-age and old populations of stars in galaxies. Starting from a grid of theoretical population synthesis...
Estrada-Piedra, Trilce, Torres-Papaqui, Juan Pablo, Terlevich, Roberto, Fuentes, Olac, Terlevich, Elena
We present a new technique to segregate old and young stellar populations in galactic spectra using machine learning methods. We used an ensemble of classifiers, each classifier in the ensemble...
How old are the HII Galaxies? (2003)
Terlevich, Roberto, Silich, Sergiy, Rosa-Gonzalez, Daniel, Terlevich, Elena
Using a novel approach we have reanalized the question of whether the extreme star forming galaxies known as HII galaxies are truly young or rejuvenated old systems. We first present a method of...
Regions of Star Formation: Chemical Issues.(Discussion Session) (2002)
Diaz, Angeles I., Edmunds, Mike G., Terlevich, Elena
Three are the main questions that were posed to the audience during this discussion session: a) Can galaxy abundances be believed?, b) What progress can we expect soon and from where? and c) Can we...
Castellanos, Marcelo, Diaz, Angeles I., Terlevich, Elena
The ionising stellar populations of eleven HII regions in the spiral galaxies: NGC628, NGC925, NGC1232 and NGC1637, all of them reported to have solar or oversolar abundances according to empirical...
RevMexAA (Serie de Conferencias), 12, 272--274 (2002) (2002)
Elena Terlevich, Roberto Terlevich
Investigating the use of the Hubble diagram to measure the cosmological constant (#) and the mass density of the Universe(# M ), we found an important focusing e#ect in # for z 3. This e#ect implies...
RevMexAA (Serie de Conferencias), 12, 238-239 (2002) (2002)
Marcelo Castellanos, Angeles I. Daz, Elena Terlevich
We have made long-slit spectrophotometric observations in the optical and near infrared of 15 H II regions in dierent spiral galaxies (NGC 628, NGC 925, NGC 1232 and NGC 1637). These...
RevMexAA (Serie de Conferencias), 12, 238--239 (2002) (2002)
Marcelo Castellanos, Angeles I. Daz, Elena Terlevich
We have made long-slit spectrophotometric observations in the optical and near infrared of 15 H II regions in di#erent spiral galaxies (NGC 628, NGC 925, NGC 1232 and NGC 1637). These...
RevMexAA (Serie de Conferencias), 12, 272-274 (2002) (2002)
Investigating the use of the Hubble diagram to measure the cosmological constant () and the mass density of the Universe( M ), we found an important focusing eect in for z 3. This eect implies that...
Castellanos , Marcelo, Díaz , Angeles I., Terlevich , Elena
We have made long-slit spectrophotometric observations in the optical and near infrared of 15 H II regions in di erent spiral galaxies (NGC 628, NGC 925, NGC 1232 and NGC 1637). These...
New light on the search for low metallicity galaxies I. The N2 method (2001)
Denicolo, Glenda, Terlevich, Roberto, Terlevich, Elena
We present a simple metallicity estimator based on the logarithmic [NII]6584 / Halpha ratio, hereafter N2, which we envisage will become very useful for ranking galaxies in a metallicity sequence...
Castellanos, Marcelo, Diaz, Angeles, Terlevich, Elena
We present long-slit observations in the optical and near infrared of fourteen HII regions in the spiral galaxies: NGC 628, NGC 925, NGC 1232 and NGC 1637, all of them reported to have solar or...
Stellar populations in the nuclear regions of nearby radiogalaxies (2001)
Aretxaga, Itziar, Terlevich, Elena, Terlevich, Roberto, Cotter, Garret, Diaz, Angeles
We present optical spectra of the nuclei of seven luminous (P(178MHz) > 10**25 W Hz**(-1) Sr**(-1)) nearby (z
Evolution of the X-ray luminosity and metallicity of starburst blown superbubbles (2000)
Silich, Sergey A., Tenorio-Tagle, Guillermo, Terlevich, Roberto, Terlevich, Elena, Netzer, Hagai
We calculate the time-dependent metal production expected from starbursts and use them as boundary conditions in our 2D simulations of evolving superbubbles. We assume that the produced metals...
Chemical Abundances and Ionizing Clusters of HII Regions in the LINER Galaxy NGC 4258 (2000)
Diaz, Angeles I., Castellanos, Marcelo, Terlevich, Elena, Garcia-Vargas, Maria L.
We present long-slit observations in the optical and near infrared of eight HII regions in the spiral galaxy NGC 4258. Six of the observed regions are located in the SE inner spiral arms and the...
The Evolution of Superbubbles and the Detection of Ly alpha in Star-Forming Galaxies (1999)
Guillermo Tenorio-tagle, Sergey A. Silich, Daniel Kunth, Elena Terlevich, Roberto Terlevich
The detection of Ly# emission in star-forming galaxies in different shapes and intensities (always smaller than predicted for case B recombination) has puzzled the astronomical community for more...
Diaz, Angeles I., Alvarez, Mar Alvarez, Terlevich, Elena, Terlevich, Roberto, Portal, Miguel Sanchez, Aretxaga, Itziar
V,R,I continuum bands and Halpha + [NII] photometry for circumnuclear star forming regions (CNSFR) is presented, for galaxies with different kinds of nuclear activity: NGC 7469 (Sy 1), NGC 1068 (Sy...
HII Galaxies as deep cosmological probes (1999)
Melnick, Jorge, Terlevich, Roberto, Terlevich, Elena
We re-investigated the use of the Hubble diagram to measure the cosmological constant ($\Lambda$) and the mass density of the Universe ($\Omega_M$). We find an important focusing effect in $\Lambda$...
The evolution of superbubbles and the detection of Lyman alpha in star-forming galaxies (1999)
Tenorio-Tagle, Guillermo, Silich, Sergey A., Kunth, Daniel, Terlevich, Elena, Terlevich, Roberto
The detection of Ly alpha emission in star-forming galaxies in different shapes and intensities (always smaller than predicted for case B recombination) has puzzled the astronomical community for...
From Inaoe, Itziar Aretxaga, Esperanza Carrasco, Luis Carrasco, Elsa Recillas, Elena Terlevich, ...
MT point to a large population of mm-emitters that are likely at cosmological distances. 3. The excess in the sub-mm background radiation reported by Puget et al. may require high-redshift...
New diagnostic methods for emission-line galaxies in deep surveys (1997)
Rola, Claudia S., Terlevich, Elena, Terlevich, Roberto J.
We present new quantitative classification methods for emission-line galaxies, which are specially designed to be used in deep galaxy redshift surveys. A good segregation between starbursts and...
UV HST Spectroscopy of Star-Forming Galaxies (1996)
Daniel Kunth, James Lequeux, J. Miguel Mas-hesse, Elena Terlevich, Roberto Terlevich
HST spectroscopical observations of 8 HII galaxies are reported. Lyff emission was detected in 4 of them. We find that it is the velocity structure of the gas which is the main determining factor for...