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M. G. Pastoriza  - - - 
Top co-authors See all
A. Rodríguez-Ardila

64 shared publications

Laboratório Nacional de Astrofísica/MCTI, 37530-000, Itajubá, MG, Brazil

S. M. Viegas

29 shared publications

IAG - USP, Sao Paulo, Brazil

Jorge Ricardo Ducati

27 shared publications

Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil

M. Rubio

10 shared publications

Departamento de Astronomía, Universidad de Chile, Casilla 36-D Santiago, Chile

Sandro B. Rembold

4 shared publications

Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, Rio Grande do Sul, Brazil

Publication Record
Distribution of Articles published per year 
(1996 - 2014)
Total number of journals
published in
Publications See all
Article 0 Reads 5 Citations Probing the circumnuclear stellar populations of starburst galaxies in the near-infrared N. Z. Dametto, R. Riffel, M. G. Pastoriza, A. Rodríguez-Ardi... Published: 25 July 2014
Monthly Notices of the Royal Astronomical Society, doi: 10.1093/mnras/stu1243
DOI See at publisher website
PREPRINT 0 Reads 0 Citations Probing the Circumnuclear Stellar Populations of Starburst Galaxies in the Near-infrared N. Z. Dametto, R. Riffel, M. G. Pastoriza, A. Rodríguez-Ardi... Published: 24 June 2014
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We employ the NASA Infrared Telescope Facility's near-infrared spectrograph SpeX at 0.8-2.4$\mu$m to investigate the spatial distribution of the stellar populations (SPs) in four well known Starburst galaxies: NGC34, NGC1614, NGC3310 and NGC7714. We use the STARLIGHT code updated with the synthetic simple stellar populations models computed by Maraston (2005, M05). Our main results are that the NIR light in the nuclear surroundings of the galaxies is dominated by young/intermediate age SPs ($t \leq 2\times10^9$yr), summing from $\sim$40\% up to 100\% of the light contribution. In the nuclear aperture of two sources (NGC1614 and NGC3310) we detected a predominant old SP component ($t > 2\times10^9$yr), while for NGC34 and NGC7714 the younger component prevails. Furthermore, we found evidence of a circumnuclear star formation ring-like structure and a secondary nucleus in NGC1614, in agreement with previous studies. We also suggest that the merger/interaction experienced by three of the galaxies studied, NGC1614, NGC3310 and NGC7714 can explain the lower metallicity values derived for the young SP component of these sources. In this scenario the fresh unprocessed metal poorer gas from the destroyed/interacting companion galaxy is driven to the centre of the galaxies and mixed with the central region gas, before star formation takes place. In order to deepen our analysis, we performed the same procedure of SP synthesis using Maraston (2011, M11) EPS models. Our results show that the newer and higher resolution M11 models tend to enhance the old/intermediate age SP contribution over the younger ages.
Article 0 Reads 0 Citations Erratum: Molecular hydrogen and [Fe ii] in active galactic nuclei III: LINERS and star forming galaxies R. Riffel, A. Rodríguez-Ardila, M. G. Pastoriza, C. Bonatto,... Published: 09 May 2013
Monthly Notices of the Royal Astronomical Society, doi: 10.1093/mnras/stt664
DOI See at publisher website
Article 0 Reads 6 Citations Molecular hydrogen and [Fe II] in active galactic nuclei - III. Low-ionization nuclear emission-line region and star-for... R. Riffel, A. Rodríguez-Ardila, M. G. Pastoriza, C. Bonatto,... Published: 04 February 2013
Monthly Notices of the Royal Astronomical Society, doi: 10.1093/mnras/stt026
DOI See at publisher website
PREPRINT 0 Reads 0 Citations Molecular Hydrogen and [Fe II] in Active Galactic Nuclei III: LINERS and Star Forming Galaxies R. Riffel, A. Rodríguez-Ardila, I. Alemán, M. S. Brotherton,... Published: 03 January 2013
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We study the kinematics and excitation mechanisms of H2 and [Fe II] lines in a sample of 67 emission-line galaxies with Infrared Telescope Facility SpeX near-infrared (NIR, 0.8-2.4 micrometers) spectroscopy together with new photoionisation models. H2 emission lines are systematically narrower than narrow-line region (NLR) lines, suggesting that the two are, very likely, kinematically disconnected. The new models and emission-line ratios show that the thermal excitation plays an important role not only in active galactic nuclei but also in star forming galaxies. The importance of the thermal excitation in star forming galaxies may be associated with the presence of supernova remnants close to the region emitting H2 lines. This hypothesis is further supported by the similarity between the vibrational and rotational temperatures of H2. We confirm that the diagram involving the line ratios H2 2.121/Br_gamma and [Fe II] 1.257/Pa_beta is an efficient tool for separating emission-line objects according to their dominant type of activity. We suggest new limits to the line ratios in order to discriminate between the different types of nuclear activity.
Article 0 Reads 0 Citations The cluster of galaxies LCDCS-S001 - II. r′ and i′ photometry, morphological analysis and improved kinematic parameters M. G. Pastoriza, S. B. Rembold Published: 23 March 2012
Monthly Notices of the Royal Astronomical Society, doi: 10.1111/j.1365-2966.2012.20651.x
DOI See at publisher website ABS Show/hide abstract
We present a technique to identify the most probable dynamical formation scenario for an observed binary or triple system containing one or more merger products or, alternatively, to rule out the possibility of a dynamical origin. Our method relies on an analytic prescription for energy conservation during stellar encounters. With this, observations of the multiple star system containing the merger product(s) can be used to work backwards in order to constrain the initial orbital energies of any single, binary or triple systems that went into the encounter. The initial semimajor axes of the orbits provide an estimate for the collisional cross-section and therefore the time-scale for the encounter to occur in its host cluster.