Navegação Ciências Exatas e da Terra por Assunto "Galaxies: nuclei"

Resultados 61-80 de 104

    • Short timescale monitoring of the X-ray, UV, and broad double-pead emission line of the nucleus of 1097 

      Schimoia, Jáderson da Silva; Storchi-Bergmann, Thaisa; Grupe, Dirk; Eracleous, Michael; Peterson, Bradley M.; Baldwin, Jack A.; Nemmen, Rodrigo S.; Winge, Claudia (2015) [Artigo de periódico]
      Recent studies have suggested that the short-timescale (<~ 7 days) variability of the broad (∼10,000 km s-ˡ) doublepeaked Hα profile of the LINER nucleus of NGC 1097 could be driven by a variable X-ray emission from a ...

    • Short timescale variations of the Hα double-peaked profile of the nucleus of NGC 1097 

      Schimoia, Jáderson da Silva; Storchi-Bergmann, Thaisa; Nemmen, Rodrigo S.; Winge, Claudia; Eracleous, Michael (2012) [Artigo de periódico]
      The broad (FWHM ∼ 10,000 km s-ˡ) double-peaked Hα profile from the LINER/Seyfert 1 nucleus of NGC 1097 was discovered in 1991 and monitored for the following 11 years. The profile showed variations attributed to the rotation ...

    • A snapshot of the continuous emission of the active galactic nucleus in ngc 3783 from gamma-ray to radio wavelengths 

      Alloin, Danielle Marie; Santos-Lleo, M.; Peterson, Bradley M.; Wamsteker, W.; Altieri, B.; Brinkmann, W.; Crenshaw, Daniel Michael; George, I.M.; Clavel, J.; Glass, I.S.; Johnson, W.N.; Kriss, Gerard A.; Malkan, M.A.; Polidan, R.S.; Reichert, G.A.; Rodriguez-Pascual, P.M.; Romanishin, W.; Starr, C.H.; Stirpe, Giovanna M.; Taylor, M.; Turner, T.J.; Vega, H.J. de; Winge, Claudia; Wood, D.O.S. (1995) [Artigo de periódico]
      With the aim of better understanding the physical processes that produce the continuous emission in active galactic nuclei (AGNs), a snapshot of the overall continuous energy distribution of NGC 3783, from γ-ray to radio ...

    • Space telescope and optical reverberation mapping project : III. optical continuum emission and broadband time delays in NGC 5548 

      Fausnaugh, Michael; Denney, Kelly D.; Barth, Aaron J.; Bentz, Misty Cherie; Bottorff, Mark; Carini, Michael; Croxall, Kevin V.; De Rosa, Gisella; Goad, Michael R.; Horne, Keith; Joner, Michael D.; Kaspi, Shai; Kim, Minsun; Klimanov, S. A.; Kochanek, C.S.; Leonard, Douglas C.; Netzer, Hagai; Peterson, Bradley M.; Schnuelle, Kirsten; Sergeev, Sergey G.; Vestergaard, Marianne; Zheng, WeiKang; Zu, Ying; Anderson, Matt; Arévalo, Patricia; Bazhaw, C.; Borman, G. A.; Boroson, Todd; Brandt, W.N.; Breeveld, Alice A.; Brewer, Brendon J.; Cackett, Edward M.; Crenshaw, Daniel Michael; Dalla Bontà, Elena; De Lorenzo-Cáceres, Adriana; Dietrich, Matthias; Edelson, Rick A.; Efimova, Natalia V.; Ely, Justin C.; Evans, Phil A.; Filippenko, Alexei V.; Flatland, Kelsi; Gehrels, Neil C.; Geier, Stephan; Gelbord, Jonathan M.; Gonzalez, Luis A.; Gorjian, Varoujan; Grier, Catherine J.; Grupe, Dirk; Hall, Patrick B.; Hicks, Shannon; Horenstein, Daniel; Hutchison, T.; Im, Myungshin; Jensen, J. J.; Jones, Jeremy Bryn; Kaastra, Jelle S.; Kelly, Brandon Charles; Kennea, Jamie A.; Kim, Sang Chul; Korista, Kirk T.; Kriss, Gerard A.; Lee, Julia C.; Lira, Paulina; MacInnis, F.; Manne-Nicholas, Emily R.; Mathur, Smita; Mchardy, Ian Michael; Montouri, C.; Musso, R.; Nazarov, S. V.; Norris, Richard P.; Nousek, John A.; Okhmat, D. N.; Pancoast, Anna; Papadakis, Iossif; Parks, J. Robert; Pei, Liuyi; Pogge, Richard William; Pott, Jörg-Uwe; Rafter, Stephen E.; Rix, H.-W.; Saylor, Dicy A.; Schimoia, Jáderson da Silva; Siegel, Michael H.; Spencer, Meghin; Starkey, Donn R.; Sung, Hyun-Il; Teems, Katherine G.; Treu, Tommaso; Turner, Clay S.; Uttley, Phil; Villforth, Carolin; Weiss, Y.; Woo, Jong-Hak; Yan, H.; Young, Stuart (2016) [Artigo de periódico]
      We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine ...

    • Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 

      Goad, Michael R.; Korista, Kirk T.; De Rosa, Gisella; Kriss, Gerard A.; Edelson, Rick A.; Barth, Aaron J.; Ferland, Gary J.; Kochanek, C.S.; Netzer, Hagai; Peterson, Bradley M.; Bentz, Misty Cherie; Bisogni, S.; Crenshaw, Daniel Michael; Denney, Kelly D.; Ely, Justin C.; Fausnaugh, Michael; Grier, Catherine J.; Gupta, Anjali K.; Horne, Keith; Kaastra, Jelle S.; Pancoast, Anna; Pei, Liuyi; Pogge, Richard William; Skielboe, Andreas; Starkey, Donn R.; Vestergaard, Marianne; Zu, Ying; Anderson, Matt; Arévalo, Patricia; Bazhaw, C.; Borman, G. A.; Boroson, Todd; Bottorff, Mark; Brandt, W.N.; Breeveld, Alice A.; Brewer, Brendon J.; Cackett, Edward M.; Carini, Michael; Croxall, Kevin V.; Dalla Bontà, Elena; De Lorenzo-Cáceres, Adriana; Dietrich, Matthias; Efimova, Natalia V.; Evans, Phil A.; Filippenko, Alexei V.; Flatland, Kelsi; Gehrels, Neil C.; Geier, Stephan; Gelbord, Jonathan M.; Gonzalez, Luis A.; Gorjian, Varoujan; Grupe, Dirk; Hall, Patrick B.; Hicks, Shannon; Horenstein, Daniel; Hutchison, T.; Im, Myungshin; Jensen, J. J.; Joner, Michael D.; Jones, Jeremy Bryn; Kaspi, Shai; Kelly, Brandon Charles; Kennea, Jamie A.; Kim, Minsun; Kim, Sang Chul; Klimanov, S. A.; Lee, Julia C.; Leonard, Douglas C.; Lira, Paulina; MacInnis, F.; Manne-Nicholas, Emily R.; Mathur, Smita; Mchardy, Ian Michael; Montouri, C.; Musso, R.; Nazarov, S. V.; Norris, Richard P.; Nousek, John A.; Okhmat, D. N.; Papadakis, Iossif; Parks, J. Robert; Pott, Jörg-Uwe; Rafter, Stephen E.; Rix, H.-W.; Saylor, Dicy A.; Schimoia, Jáderson da Silva; Schnuelle, Kirsten; Sergeev, Sergey G.; Siegel, Michael H.; Spencer, Meghin; Sung, Hyun-Il; Teems, Katherine G.; Treu, Tommaso; Turner, Clay S.; Uttley, Phil; Villforth, Carolin; Weiss, Y.; Woo, Jong-Hak; Yan, H.; Young, Stuart; Zheng, WeiKang (2016) [Artigo de periódico]
      During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum ...

    • Spectral analysis of the nuclear stellar population and gas emission in NGC 6240 

      Schmitt, Henrique Roberto; Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda (1996) [Artigo de periódico]
      We analyse the nuclear stellar population and emission-line spectrum in the range λλ 3100-9700 Å of the infrared luminous merger galaxy NGC 6240. Two spectral extractions from CCD frames are studied: one corresponding to ...

    • Spectral analysis of the nuclear stellar population and gas emission in six nearby galaxies 

      Saraiva, Maria de Fátima Oliveira; Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda; Bonatto, Charles Jose (2001) [Artigo de periódico]
      Optical spectra were used to study the stellar population and gas emission, when present, in the central parts of the elliptical galaxies NGC6958, NGC6851 and ESO185-G54, and the spiral galaxies NGC5757, NGC7412 and IC4214. ...

    • Spectral models for low-luminosity active galactic nuclei in LINERs : the role of advection-dominated accretion and jets 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa; Eracleous, Michael (2014) [Artigo de periódico]
      We find evidence for a correlation between the accretion rate and jet power and an anticorrelation between the radio loudness and the accretion rate.We confirm previous findings that the radio emission is severely ...

    • Spectral synthesis of the nuclear regions of Seyfert 2 and radio galaxies 

      Schmitt, Henrique Roberto; Storchi-Bergmann, Thaisa; Fernandes Junior, Roberto Cid (1999) [Artigo de periódico]
      We present the results of an optical spectral synthesis analysis for the nuclei of 20 Seyfert 2 and four radio galaxies, using a base of stellar population templates of different ages and metallicities and a power-law ...

    • Spectroscopic properties and dynamical evolution of the emerging system AM 1003-435 

      Gunthardt, Guillermo; Aguero, E.L.; Rodrigues, Irapuan; Díaz, Rubén Joaquín (2006) [Artigo de periódico]
      Aims. We study the system AM1003-435, which is composed of two strong interacting galaxies. Methods. We obtained long-slit optical spectra of twelve zones of the system, and performed numerical simulations of the encounter ...

    • Spitzer space telescope measurements of dust reverberation lags in the Seyfert 1 galaxy NGC 6418 

      Vasquez, Billy; Galianni, Pasquale; Richmond, Michael; Robinson, Andrew; Axon, David J.; Horne, Keith; Almeyda, Triana; Fausnaugh, Michael; Peterson, Bradley M.; Bottorff, Mark; Gallimore, Jack F.; Elitzur, Moshe; Netzer, Hagai; Storchi-Bergmann, Thaisa; Marconi, A.; Capetti, A.; Batcheldor, Dan; Buchanan, Catherine; Stirpe, Giovanna M.; Kishimoto, Makoto; Packham, Christopher; Pérez Jiménez, Enrique; Tadhunter, Clive; Upton, John; Estrada-Carpenter, Vicente (2015) [Artigo de periódico]
      We present results from a 15 month campaign of high-cadence (∼3 days) mid-infrared Spitzer and optical (B and V) monitoring of the Seyfert 1 galaxy NGC 6418, with the objective of determining the characteristic size of the ...

    • Star formation in AGNs at the hundred parsec scale using MIR high-resolution images 

      Dutra, Daniel Ruschel; Rodríguez Espinosa, Jose Miguel; Gonzalez Martin, Omaira; Pastoriza, Miriani Griselda; Riffel, Rogério (2017) [Artigo de periódico]
      It has been well established in the past decades that the central black hole masses of galaxies correlate with dynamical properties of their harbouring bulges. This notion begs the question of whether there are causal ...

    • Stellar population gradient in lenticular galaxies : NGC 1023, NGC 3115 and NGC 4203 

      Bassin Filho, Máximo; Bonatto, Charles Jose (2003) [Artigo de periódico]
      We investigate the stellar population content in the lenticular galaxies NGC1023, NGC3115 and NGC4203 applying a population synthesis method based on a seven component spectral basis with different ages – 2.5 × 106, 10× ...

    • Stellar populations in a complete sample of local radio galaxies 

      Raimann, Daniel Iunes; Storchi-Bergmann, Thaisa; Quintana, Henrique; Hunstead, Richard W.; Wisotzki, Lutz (2005) [Artigo de periódico]
      We investigate the nature of the continuum emission and stellar populations in the inner 1–3 kpc of a complete sample of 24 southern radio galaxies, and we compare the results with a control sample of 18 non-active early-type ...

    • Stellar populations in local AGNs : evidence for enhanced star formation in the inner 100 pc 

      Hahn, Luis Gabriel Dahmer; Riffel, Rogério; Rodriguez-Ardila, Alberto; Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Oliveira, Murilo Marinello Assis de; Davies, Richard I.; Burtscher, Leonard; Dutra, Daniel Ruschel; Rosario, David (2022) [Artigo de periódico]
      In modern models and simulations of galactic evolution, the star formation in massive galaxies is regulated by an ad hoc active galactic nuclei (AGN) feedback process. However, the physics and the extension of such effects ...

    • 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 ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VI. Variability of NGC 3783 from ground-based data 

      Stirpe, Giovanna M.; Winge, Claudia; Altieri, B.; Alloin, Danielle Marie; Aguero, E.L.; Anupama, G.C.; Ashley, R.; Bertram, R.; Calderon, J.H.; Catchpole, R.M.; Corradi, R.L.M.; Covino, E.; Dottori, Horacio Alberto; Feast, M.W.; Ghosh, K.K.; Hutton, R. Gil; Glass, I.S.; Grebel, Eva K.; Jorda, L.; Koen, C.; Laney, C.D.; Maia, Marcio Antonio Geimba; Marang, Fred; Mayya, Y.D.; Morrell, Nidia; Nakada, Y.; Pastoriza, Miriani Griselda; Pati, A.K.; Pelat, D.; Peterson, Bradley M.; Prabhu, T.P.; Roberts, G.; Sagar, R.; Salamanca, I.; Sekiguchi, Kazuhiro; Storchi-Bergmann, Thaisa; Subramaniam, A.; Villada, M.; Wagner, R.M.; Whitelock, P.A.; Winkler, Hartmut; Clavel, J.; Dietrich, Matthias; Kollatschny, W.; Perola, G.C.; Van Winckel, H.; Van Wyk, Francois; O'Brien, P.T.; Recondo-Gonzalez, M.C.; Rodriguez-Pascual, P.M.; Santos-Lleo, M. (1994) [Artigo de periódico]
      The Seyfert 1 galaxy NGC 3783 was intensely monitored in several bands between 1991 December and 1992 August. This paper presents the results from the ground-based observations in the optical and near-IR bands, which ...

    • Streaming motions toward the supermassive black hole in NGC 1097 

      Fathi, Kambiz; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Winge, Claudia; Axon, David J.; Robinson, Andrew; Capetti, A.; Marconi, A. (2006) [Artigo de periódico]
      We have used GMOS-IFU and high-resolution HST-ACS observations to map, in unprecedented detail, the gas velocity field and structure within the 0.7 kpc circumnuclear ring of the SBb LINER/Seyfert 1 galaxy NGC 1097.We find ...

    • A strong correlation between circumnuclear dust and black hole accretion in early-type galaxies 

      Lopes, Ramiro Duarte Simões; Storchi-Bergmann, Thaisa; Saraiva, Maria de Fátima Oliveira; Martini, Paul (2007) [Artigo de periódico]
      We present a detailed investigation of the incidence of circumnuclear dust structure in a large, well-matched sample of early-type galaxies with and without active galactic nuclei (AGNs). All 34 early-type AGN hosts in our ...