Navegação Ciências Exatas e da Terra por Autor "Koss, Michael"

Resultados 1-9 de 9

    • BASS. XXII : the BASS DR2 AGN catalog and data 

      Koss, Michael; Riffel, Rogério; Williams, Jonathan (2022) [Artigo de periódico]
      We present the active galactic nucleus (AGN) catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2). With this DR2 release we provide 1449 optical spectra, of which ...

    • BASS. XXIV : the BASS DR2 spectroscopic line measurements and AGN demographics 

      Oh, Kyuseok; Koss, Michael; Ueda, Yoshihiro; Stern, Daniel; Ricci, Claudio; Trakhtenbrot, Benny; Powell, Meredith; Brok, Jakob den; Lamperti, Isabella; Mushotzky, Richard; Ricci, Federica; Bär, Rudolf; Rojas, Alejandra; Ichikawa, Kohei; Riffel, Rogério; Treister, Ezequiel; Harrison, Fiona Anne; Urry, C. Megan; Bauer, Franz Erik; Schawinski, Kevin (2022) [Artigo de periódico]
      We present the second catalog and data release of optical spectral line measurements and active galactic nucleus (AGN) demographics of the BAT AGN Spectroscopic Survey, which focuses on the Swift-BAT hard X-ray detected ...

    • BAT AGN Spectroscopic Survey -IV. : near-infrared coronal lines, hidden broad lines and correlation with hard X-ray emission 

      Lamperti, Isabella; Koss, Michael; Trakhtenbrot, Benny; Schawinski, Kevin; Ricci, Claudio; Oh, Kyuseok; Landt, Hermine; Riffel, Rogério; Rodriguez-Ardila, Alberto; Gehrels, Neil C.; Harrison, Fiona Anne; Masetti, Nicola; Mushotzky, Richard; Treister, Ezequiel; Ueda, Yoshihiro; Veilleux, Sylvain (2017) [Artigo de periódico]
      We provide a comprehensive census of the near-infrared (NIR, 0.8–2.4 μm) spectroscopic properties of 102 nearby (z < 0.075) active galactic nuclei (AGN), selected in the hard X-ray band (14–195 keV) from the Swift-Burst ...

    • Constraints on the broad-line region properties and extinction in local Seyferts 

      Müller, Allan Schnorr; Davies, Richard I.; Korista, Kirk T.; Burtscher, Leonard; Rosario, David; Storchi-Bergmann, Thaisa; Contursi, Alessandra; Genzel, Reinhard; Gracia-Carpio, Javier; Hicks, Erin K. S.; Janssen, Annemieke; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Riffel, Rogério; Riffel, Rogemar André; Schartmann, Marc; Sternberg, Amiel; Sturm, Eckhard; Tacconi, Linda J.; Veilleux, Sylvain; Ulrich, Otho Adam (2016) [Artigo de periódico]
      We use high-spectral resolution (R>8000) data covering 3800–13 000 Å to study the physical conditions of the broad-line region (BLR) of nine nearby Seyfert 1 galaxies. Up to six broad HI lines are present in each spectrum. ...

    • Insights on the dusty torus and neutral torus from optical and X-ray obscuration in a complete volume limited hard X-ray AGN sample 

      Davies, Richard I.; Burtscher, Leonard; Rosario, David; Storchi-Bergmann, Thaisa; Contursi, Alessandra; Genzel, Reinhard; Gracia-Carpio, Javier; Hicks, Erin K. S.; Janssen, Annemieke; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Ricci, Claudio; Riffel, Rogério; Riffel, Rogemar André; Schartmann, Marc; Müller, Allan Schnorr; Sternberg, Amiel; Sturm, Eckhard; Tacconi, Linda J.; Veilleux, Sylvain (2015) [Artigo de periódico]
      We describe a complete volume limited sample of nearby active galaxies selected by their 14–195 keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We also describe a ...

    • Ionized outflows in local luminous AGN : what are the real densities and outflow rates? 

      Davies, Richard I.; Baron, Dalya; Shimizu, Taro; Netzer, Hagai; Burtscher, Leonard; De Zeeuw, P. Tim; Genzel, Reinhard; Hicks, Erin K. S.; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Ricci, Claudio; Riffel, Rogério; Riffel, Rogemar André; Rosario, David; Schartmann, Marc; Müller, Allan Schnorr; Shangguan, J.; Sternberg, Amiel; Sturm, Eckhard; Storchi-Bergmann, Thaisa; Tacconi, Linda J.; Veilleux, Sylvain (2020) [Artigo de periódico]
      We report on the determination of electron densities, and their impact on the outflow masses and rates, measured in the central few hundred parsecs of 11 local luminous active galaxies. We show that the peak of the integrated ...

    • LLAMA : the MBH–σ⋆ relation of the most luminous local AGNs 

      Caglar, Turgay; Burtscher, Leonard; Brandl, Bernhard; Brinchmann, Jarle; Davies, Richard I.; Hicks, Erin K. S.; Koss, Michael; Lin, Ming-Yi; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Riffel, Rogemar André; Riffel, Rogério; Rosario, David; Schartmann, Marc; Müller, Allan Schnorr; Shimizu, Taro; Storchi-Bergmann, Thaisa; Veilleux, Sylvain; Xivry, Gilles Orban de; Bennert, Vardha N. (2020) [Artigo de periódico]
      Context. The MBH–σ⋆ relation is considered a result of coevolution between the host galaxies and their supermassive black holes. For elliptical bulge hosting inactive galaxies, this relation is well established, but there ...

    • Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation 

      Armah, Mark; Riffel, Rogério; Dors Júnior, Oli Luiz; Oh, Kyuseok; Koss, Michael; Ricci, Claudio; Trakhtenbrot, Benny; Valerdi, Mabel; Riffel, Rogemar André; Krabbe, Angela Cristina (2023) [Artigo de periódico]
      We present oxygen abundances relative to hydrogen (O/H) in the narrow line regions (NLRs) gas phases of Seyferts 1 (Sy 1s) and Seyferts 2 (Sy 2s) active galactic nuclei (AGNs). We used fluxes of the optical narrow emission ...

    • The role of host galaxy for the environmental dependence of active nuclei in local galaxies 

      Davies, Richard I.; Hicks, Erin K. S.; Erwin, Peter; Burtscher, Leonard; Contursi, Alessandra; Genzel, Reinhard; Janssen, Annemieke; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Ricci, Claudio; Riffel, Rogério; Riffel, Rogemar André; Rosario, David; Schartmann, Marc; Müller, Allan Schnorr; Shimizu, Taro; Sternberg, Amiel; Sturm, Eckhard; Storchi-Bergmann, Thaisa; Tacconi, Linda J.; Veilleux, Sylvain (2017) [Artigo de periódico]
      We discuss the environment of local hard X-ray selected active galaxies, with reference to two independent group catalogues. We find that the fraction of these AGN in S0 host galaxies decreases strongly as a function of ...