Navegação Ciências Exatas e da Terra por Assunto "Ultraviolet: galaxies"

Resultados 1-14 de 14

    • An atlas of Hubble Space Telescope STIS spectra of Seyfert galaxies 

      Spinelli, Patrícia Figueiro; Storchi-Bergmann, Thaisa; Brandt, Carlos Henrique; Calzetti, Daniela (2006) [Artigo de periódico]
      We present a compilation of spectra of 101 Seyfert galaxies obtained with the Hubble Space Telescope (HST ) Space Telescope Imaging Spectrograph (STIS), covering the UV and/or optical spectral range. Information on all the ...

    • Dust extinction of the stellar continua in Starburst galaxies : the ultraviolet and optical extinction law 

      Calzetti, Daniela; Kinney, Anne Louise; Storchi-Bergmann, Thaisa (1994) [Artigo de periódico]
      We analyze the IUE UV and the optical spectra of 39 starburst and blue compact galaxies in order to study the average properties of dust extinction in extended regions of galaxies. The optical spectra have been obtained ...

    • Mass loss from red giant stars in M67 : is there any evidence for a metallicity dependence? 

      Carraro, Clóvis Carlos; Girardi, Leo Alberto; Bressan, Alessandro; Chiosi, Cesare (1996) [Artigo de periódico]
      Recent claims in the literature, that the rate of mass loss from red giant branch (RGB) stars in old, open clusters like M 67 and NGC 6791, increases with the metallicity above the value holding for Globular Clusters and ...

    • OMEGA – OSIRIS mapping of emission-line galaxies in A901/2 : IV. Extinction of star formation estimators with inclination 

      Wolf, Christian; Weinzirl, Timothy; Aragón-Salamanca, Alfonso; Gray, Meghan E.; Rodríguez del Pino, Bruno; Chies-Santos, Ana Leonor; Bamford, Steven Peter; Böhm, Asmus; Harborne, Katherine (2018) [Artigo de periódico]
      We study the effect of inclination on the apparent brightness of star-forming galaxies in spectral passbands that are commonly used as star formation indicators. As diagnostics we use mass-to-light ratios in three passbands: ...

    • On the nature of the near-UV extended light in Seyfert galaxies 

      Muñoz Marín, Victor M.; Storchi-Bergmann, Thaisa; González Delgado, Rosa M.; Schmitt, Henrique Roberto; Spinelli, Patrícia Figueiro; Pérez Jiménez, Enrique; Fernandes Junior, Roberto Cid (2009) [Artigo de periódico]
      We study the nature of the extended near-UV emission in the inner kiloparsec of a sample of 15 Seyfert (Sy) galaxies which have both near-UV (F330W) and narrow-band [O III] highresolution Hubble images. For the majority ...

    • On the nature of the uv turnup in early-type galaxies 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Pastoriza, Miriani Griselda; Alloin, Danielle Marie (1996) [Artigo de periódico]
      We study the UV turnup in early-type galaxies from coadded IUE spectra reaching an unprecedented signal to noise ratio. Some spectral groups resulted with strong or moderate UV turnup, while in others it is very weak or ...

    • Probing nuclear starburst activity in a sample of nearby spiral galaxies 

      Bonatto, Charles Jose; Pastoriza, Miriani Griselda; Alloin, Danielle Marie; Bica, Eduardo Luiz Damiani (1998) [Artigo de periódico]
      As part of a systematic study of the UV properties of galaxies in the IUE library,we present in this paper an analysis of nuclear stellar populations in spiral galaxies with radial velocity ≤ 5 000kms-ˡ. In this sample of ...

    • Star formation in distant starburst galaxies 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda; Alloin, Danielle Marie (2000) [Artigo de periódico]
      This paper discusses the stellar population content of distant (5 000kms−1 VR 16 000kms−1) galaxies with enhanced star-formation activity. Distinction is made between isolated galaxies and galaxies morphologically disturbed, ...

    • Steps foward determination of the size and structure of the broad-line region in active galactic nuclei. V. Variability of the ultraviolet continuum and emission lines of NGC 3783 

      Reichert, G.A.; Rodriguez-Pascual, P.M.; Alloin, Danielle Marie; Clavel, J.; Crenshaw, Daniel Michael; Kriss, Gerard A.; Krolik, J.H.; Malkan, M.A.; Netzer, Hagai; Peterson, Bradley M.; Wamsteker, W.; Pastoriza, Miriani Griselda; Altamore, A.; Altieri, B.; Anderson, K.S.J.; Blackwell, J.H., Jr.; Boisson, Catherine; Brosch, N.; Carone, T.E.; Dietrich, Matthias; England, M.N.; Evans, I.N.; Filippenko, Alexei V.; Gaskell, C.M.; Good, M.; Gondhalekar, P.M.; Horne, Keith; Kazanas, D.; Kollatschny, W.; Koratkar, A.P.; Korista, Kirk T.; Macalpine, G.M.; Maoz, D.; Mazeh, Tsevi; Mccollum, B.; Miller, Hugh Richard; Oliveira, Carlos Roberto Mendes de; O'Brien, P.T.; Pelat, D.; Pérez Jiménez, Enrique; Perola, G.C.; Pogge, Richard William; Ptak, R.L.; Recondo-Gonzalez, M.C.; Rodríguez Espinosa, Jose Miguel; Rosenblat, E.I.; Asadun, A.C.; Santos-Lleo, M.; Shields, J.C.; Shrader, C.R.; Shull, John Michael; Simkin, S.M.; Sitko, M.L.; Snijders, M.A.J.; Sparke, L.S.; Stirpe, Giovanna M.; Stoner, R.E.; Storchi-Bergmann, Thaisa; Sun, W.-H.; Wang, T.; Welsh, W.F.; White, R.J.; Winge, Claudia; Zheng, W. (1994) [Artigo de periódico]
      We report on the results of intensive ultraviolet spectral monitoring of the Seyfert 1 galaxy NGC 3783. The nucleus of NGC 3783 was observed with the International Ultraviolet Explorer satellite on a regular basis for a ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VIII. An intensive HST, IUE, and ground-based study of NGC 5548 

      Korista, Kirk T.; Alloin, Danielle Marie; Barr, P.; Clavel, J.; Cohen, R.D.; Crenshaw, Daniel Michael; Evans, I.N.; Horne, Keith; Koratkar, A.P.; Kriss, Gerard A.; Krolik, J.H.; Malkan, M.A.; Morris, S.L.; Netzer, Hagai; O'Brien, P.T.; Peterson, Bradley M.; Reichert, G.A.; Rodriguez-Pascual, P.M.; Wamsteker, W.; Anderson, K.S.J.; Axon, David J.; Benitez, E.; Berlind, P.; Bertram, R.; Blackwell, J.H., Jr.; Bochkarev, N.G.; Boisson, Catherine; Carini, M.; Carrillo, R.; Carone, T.E.; Cheng, F.Z.; Christensem, J.A.; Chuvaev, K.K.; Dietrich, Matthias; Dokter, J.J.; Doroshenko, V.; Hayan, D. Dultzin; England, M.N.; Espey, B.R.; Filippenko, Alexei V.; Gaskell, C.M.; Goad, M.R.; Ho, Luis C.; Huchra, John P.; Jiang, Xiaojun; Kaspi, Shai; Kollatschny, W.; Laor, A.; Luminet, J.P.; Macalpine, G.M.; Mackenty, J.W.; Malkov, Yu. F.; Maoz, D.; Martin, P.G.; Matheson, T.; Mccollum, B.; Merkulova, N.; Metik, L.; Mignoli, M.; Miller, Hugh Richard; Pastoriza, Miriani Griselda; Pelat, D.; Penfold, J.; Perez, Marth; Perola, G.C.; Persaud, J.L.; Peters, J.; Pitts, R.; Pogge, Richard William; Pronik, V.I.; Ptak, R.L.; Rawley, L.; Recondo-Gonzalez, M.C.; Rodríguez Espinosa, Jose Miguel; Romanishin, W.; Sadun, A.C.; Salamanca, I.; Santos-Lleo, M.; Sekiguchi, Kazuhiro; Sergeev, S.G.; Shapovalova, A.I.; Shields, J.C.; Sharder, C.; Shull, John Michael; Silbermann, N.A.; Sitko, M.L.; Skillman, D.R.; Smith, H.A.; Smith, S.M.; Snijders, M.A.J.; Sparke, L.S.; Stirpe, Giovanna M.; Stoner, R.E.; Sun, W.-H.; Thiele, U.; Tokarz, S.; Tsvetanov, Z.I.; Turnshek, D.A.; Veilleux, Sylvain; Wagner, R.M.; Wagner, S.J.; Wanders, I.; Wang, T.; Welsh, W.F.; Weymann, R.J.; White, R.J.; Wilkes, B.J.; Wills, B.J.; Winge, Claudia; Wu, H.; Zou, Z.L. (1995) [Artigo de periódico]
      We present the data and initial results from a combined HST/IUE/ground-based spectroscopic monitoring campaign on the Seyfert I galaxy NGC 5548 that was undertaken in order to address questions that require both higher ...

    • The heating of dust in starburst galaxies : the contribution of the nonionizing radiation 

      Calzetti, Daniela; Bohlin, Ralph C.; Kinney, Anne Louise; Storchi-Bergmann, Thaisa; Heckman, Timothy M. (1995) [Artigo de periódico]
      The IUE UV and optical spectra and the far-infrared (FIR) IRAS flux densities of a sample of starburst and blue compact galaxies are used to investigate the relationship between dust obscuration and dust emission. The ...

    • The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 

      Kinney, Anne Louise; Calzetti, Daniela; Bica, Eduardo Luiz Damiani; Storchi-Bergmann, Thaisa (1994) [Artigo de periódico]
      The dust reddening law from the UV to the near-IR for the extended regions of galaxies is here derived from the spectral distributions of the starburst spiral galaxies NGC 7552 and NGC 5236. The centers of these galaxies ...

    • Ultraviolet spectral properties of magellanic and non-magellanic irregulars, H II and Starburst galaxies 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda; Alloin, Danielle Marie (1999) [Artigo de periódico]
      This paper presents the results of a stellar population analysis performed on nearby (VR ≤ 5 000 kms-ˡ) starforming galaxies, comprising magellanic and non-magellanic irregulars, H II and starburst galaxies observed with ...

    • Ultraviolet to near-infrared spectral distributions of star-forming and Seyfert 2 galaxies 

      Storchi-Bergmann, Thaisa; Kinney, Anne Louise; Challis, Peter M. (1995) [Artigo de periódico]
      Combined UV, optical, and near-IR spectral distributions of a sample of 48 southern star-forming and Seyfert 2 galaxies are presented. The optical and near-IR spectra were obtained using apertures matching those ofthe UV ...