Now showing items 1-20 of 89

    • A 0.8-2.4 μm spectral atlas of active galactic nuclei 

      Riffel, Rogemar André; Rodriguez-Ardila, Alberto; Pastoriza, Miriani Griselda (2006) [Journal article]
      Aims. We present a near-infrared spectral atlas of 47 active galactic nuclei (AGN) of all degrees of activity in the wavelength interval of 0.8–2.4 μm, including the fluxes of the observed emission lines. We analyze the ...
    • Ages and metallicities of lmc and smc red clusters through hb and g band photometry 

      Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto; Pastoriza, Miriani Griselda (1986) [Journal article]
      We present narrow band integrated photometry of the Hβ and G band absorption features for 41 LMC and 10 SMC red star clusters. An age-metallicity calibration is provided for the color-color diagram. We derive SWB types ...
    • BV surface photometry of southern galaxies. I. NGC 4507 

      Storchi-Bergmann, Thaisa; Pastoriza, Miriani Griselda (1986) [Journal article]
      From B and V photographic surface photometry we have obtained photometric parameters, mean­ luminosity profiles, and B- V color indices for the barred spiral galaxy NGC 4507. The decomposition of the mean-luminosity B ...
    • A correlation between the stellar and [Fe II] velocity dispersions in active galaxies 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Dors Júnior, Oli Luiz; Fuchs, Jaciara Tamara; Diniz, Marlon Rodrigo; Schönell Júnior, Astor João; Hennig, Moiré Gonçalves; Brum, Carine (2013) [Journal article]
      We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the ...
    • Destruction and multiple ionization of PAHs by X-rays in circumnuclear regions of AGNs 

      Monfredini, Thiago; Quitián-Lara, Heidy M.; Fantuzzi, Felipe; Wolff, Wania; Mendoza, Edgar; Lago, Alexsandre F.; Sales, Dinalva Aires de; Pastoriza, Miriani Griselda; Roberty, Heloísa Maria Boechat (2019) [Journal article]
      The infrared signatures of polycyclic aromatic hydrocarbons (PAHs) are observed in a variety of astrophysical objects, including the circumnuclear medium of active galactic nuclei (AGNs). These are sources of highly energetic ...
    • Detection of ca II absorption triplet in a circumnuclear H II region of ngc 3310 

      Terlevich, Elena; Diaz, Angeles I.; Pastoriza, Miriani Griselda; Terlevich, Roberto; Dottori, Horacio Alberto (1990) [Journal article]
      We have obtained long slit spectrophotometry across NGC 3310, a lurninous galaxy with cucumnuclear bursts of star formation, covering the spectral range from λ3650 to 9700 Å. In one giant star-forrning region, the near-IR ...
    • Field galaxies at intermediate redshift (0.2 < z < 0.8) in the direction of the galaxy cluster LCDCS-S001 

      Krabbe, Angela Cristina; Rembold, Sandro Barboza; Pastoriza, Miriani Griselda (2007) [Journal article]
      We present a spectroscopic and photometric analysis for eight field galaxies in the direction of the galaxy cluster LCDCS-S001. The spectra were obtained with the GMOS instrument at the Gemini South Observatory. The objects ...
    • Galaxy properties in different environments. II. Star formation in bulges of late-type spirals 

      Bica, Eduardo Luiz Damiani; Maia, Marcio Antonio Geimba; Bonatto, Charles Jose; Dottori, Horacio Alberto; Pastoriza, Miriani Griselda (1994) [Journal article]
      The star formation history in the nucleus of late spiral galaxies is compared between a sample in a high galaxy density medium (HDS) and a control sample (CS) of isolated galaxies. We have observed 20 HDS and 18 CS galaxies ...
    • Galaxy properties in different environments. I. The sample 

      Maia, Marcio Antonio Geimba; Pastoriza, Miriani Griselda; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto (1994) [Journal article]
      This paper presents two galaxy samples, respectively in a high and in a low local density environments that were generated from the SSRS catalog using objective criteria. A preliminary comparison of physical properties in ...
    • High resolution imaging of the early-type galaxy NGC 1380 : an insight into the nature of extended extragalactic stars clusters 

      Chies-Santos, Ana Leonor; Santiago, Basilio Xavier; Pastoriza, Miriani Griselda (2007) [Journal article]
      Context. NGC 1380 is a lenticular galaxy located near the centre of the Fornax Cluster, northeast of NGC 1399. The globular cluster system of this galaxy has hitherto only been studied from the ground. Recent studies of ...
    • High spatial resolution of the mid-infrared emission of the Compton-thick type 2 Seyfert galaxy, Markarian 3 

      Sales, Dinalva Aires de; Dutra, Daniel Ruschel; Pastoriza, Miriani Griselda; Riffel, Rogério; Winge, Claudia (2014) [Journal article]
      The mid-infrared (MIR) spectra observed with Gemini/Michelle have been used to study the nuclear region of the Compton-thick type 2 Seyfert galaxy, Markarian 3 (Mrk 3), at a spatial resolution of ∼200 pc. No polycyclic ...
    • H II region age indicators 

      Copetti, Marcus Vinicius Fontana; Pastoriza, Miriani Griselda; Dottori, Horacio Alberto (1986) [Journal article]
      The evolution of some properties of H II regions such as the relative volume R of the He⁺ and H⁺ zones, the equivalent width Wнβ of the Hβ emission line and the ratio [O III]/Hβ of the lines [O II] λλ4959, 5007 to Hβ, was ...
    • Infrared Fe II emission in narrow-line Seyfert 1 galaxies 

      Rodriguez-Ardila, Alberto; Viegas, Sueli Maria Marino; Pastoriza, Miriani Griselda; Prato, Lisa A. (2002) [Journal article]
      We obtained 0.8-2.4 μm spectra at a resolution of 320 km s-ˡ of four narrow-line Seyfert 1 galaxies in order to study the near-infrared properties of these objects. We focus on the analysis of the Fe II emission in that ...
    • Integral field spectroscopy of the inner kpc of the elliptical galaxy NGC 5044 

      Diniz, Suzi Izaquiel Ferreira; Pastoriza, Miriani Griselda; Hernández Jiménez, José Andrés; Riffel, Rogério; Ricci, Tiago Vecchi; Steiner, João Evangelista; Riffel, Rogemar André (2017) [Journal article]
      We used Gemini Multi-Object Spectrograph in the integral field unit mode to map the stellar population, emission-line flux distributions and gas kinematics in the inner kpc of NGC 5044. From the stellar populations synthesis, ...
    • Interaction effects on galaxy pairs with Gemini/GMOS- I : electron density 

      Krabbe, Angela Cristina; Rosa, Deise Aparecida; Dors Júnior, Oli Luiz; Pastoriza, Miriani Griselda; Winge, Claudia; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Rodrigues, Irapuan (2014) [Journal article]
      We present an observational study about the impacts of the interactions on the electron density of HII regions located in seven systems of interacting galaxies. The data consist of long-slit spectra in the range 4400–7300 ...
    • Interaction effects on galaxy pairs with Gemini/GMOS- III : stellar population synthesis 

      Krabbe, Angela Cristina; Rosa, Deise Aparecida; Pastoriza, Miriani Griselda; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Dors Júnior, Oli Luiz; Winge, Claudia (2017) [Journal article]
      We present an observational study of the impacts of interactions on the stellar population in a sample of galaxy pairs. Long-slit spectra in the wavelength range 3440–7300 Å obtained with the Gemini Multi-Object Spectrograph ...
    • Interaction effects on galaxy pairs with Gemini/GMOS – II oxygen abundance gradients 

      Rosa, Deise Aparecida; Dors Júnior, Oli Luiz; Krabbe, Angela Cristina; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Pastoriza, Miriani Griselda; Rodrigues, Irapuan; Winge, Claudia (2014) [Journal article]
      In this paper, we derive oxygen abundance gradients from HII regions located in 11 galaxies in eight systems of close pairs. Long-slit spectra in the range 4400–7300 Å were obtained with the Gemini Multi-Object Spectrograph ...
    • Intermediate-age stars as origin of the low-velocity dispersion nuclear ring in Mrk 1066 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Pastoriza, Miriani Griselda (2010) [Journal article]
      We report the first two-dimensional stellar population synthesis in the near-infrared of the nuclear region of an active galaxy, namely, Mrk 1066. We have used integral field spectroscopy with adaptative optics at the ...
    • Kinematics and physical properties of southern interacting galaxies : the minor merger AM 2306–721 

      Krabbe, Angela Cristina; Pastoriza, Miriani Griselda; Winge, Claudia; Rodrigues, Irapuan; Ferreiro, Diego L. (2008) [Journal article]
      We present an observational study about the effects of the interactions in the kinematics, stellar population and abundances of the components of the galaxy pair AM2306-721. Rotation curves for the main and companion ...
    • Long-slit spectrophotometry of the H II regions Gum 38a and Gum 38b 

      Girardi, Leo Alberto; Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda; Winge, Claudia (1997) [Journal article]
      We present new long-slit spectrophotometric observations in the range 3700-7200 Å of the H II regions Gum 38a and Gum 38b (RCW 57). We study the spatial distribution of reddenig ad excitation throughout the complex by means ...