Navegação Ciências Exatas e da Terra por Assunto "Buracos negros"

Resultados 1-20 de 40

    • AGN STORM 2 : IV. Swift x-ray and ultraviolet/optical monitoring of Mrk 817 

      Cackett, Edward M.; Storchi-Bergmann, Thaisa; Zaidouni, Fatima (2023) [Artigo de periódico]
      The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. ...

    • An embedded active nucleus in the OH megamaser galaxy IRAS16399-0937 

      Sales, Dinalva Aires de; Robinson, Andrew; Axon, David J.; Gallimore, Jack F.; Kharb, Preeti; Curran, R. L.; O'Dea, Christopher Peter; Baum, Stefi Alison; Elitzur, Moshe; Mittal, Rupal (2015) [Artigo de periódico]
      We present a multiwavelength study of the OH megamaser galaxy IRAS16399−0937, based on new Hubble Space Telescope (HST)/Advanced Camera for Surveys F814W and Hα+[N ii] images and archive data from HST, Two Micron All Sky ...

    • 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 ...

    • BASS. XXIX : the near-infrared view of the broad-line region (BLR) : the effects of obscuration in BLR characterization 

      Ricci, Federica; Riffel, Rogério; Veilleux, Sylvain (2022) [Artigo de periódico]
      Virial black hole (BH) mass (MBH) determination directly involves knowing the broad-line region (BLR) clouds' velocity distribution, their distance from the central supermassive BH (RBLR), and the virial factor (f). ...

    • BASS. XXVIII : Near-infrared Data Release 2 : high-ionization and broad lines in active galactic nuclei 

      Brok, Jakob den; Riffel, Rogério; Veilleux, Sylvain (2022) [Artigo de periódico]
      We present the BAT AGN Spectroscopic Survey (BASS) Near-infrared Data Release 2 (DR2), a study of 168 nearby (z¯= 0.04, z < 0.6) active galactic nuclei (AGN) from the all-sky Swift Burst Array Telescope X-ray survey observed ...

    • BASS. XXXV.: The MBH–σ* Relation of 105Month Swift-BAT Type 1 AGNs 

      Caglar, Turgay; Riffel, Rogério; Urry, C. Megan (2023) [Artigo de periódico]
      We present two independent measurements of stellar velocity dispersions (σå) from the Ca II H+K λ3969, 3934 and Mg I b λ 5183, 5172, 5167 region (3880–5550 Å) and the calcium triplet region (8350–8750 Å) for 173 hard ...

    • 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 ...

    • Bipolar ionization cones in the extended narrow-line region of nearby QSO2s 

      Storchi-Bergmann, Thaisa; Oliveira, Bruno Dall'Agnol de; Micchi, L. F. Longo; Schmitt, Henrique Roberto; Fischer, Travis C.; Kraemer, S. B.; Crenshaw, Daniel Michael; Maksym, W. Peter; Elvis, Martin; Fabbiano, Giuseppina; Colina, Luis (2018) [Artigo de periódico]
      We have used narrowband [O III] λλ4959, 5007 and Hα+[N II] λλ6548, 84 Hubble Space Telescope (HST) images of nine luminous (L[O III]>1042 erg s−1) type 2 QSOs with redshifts 0.1<z<0.5 in order to constrain the geometry of ...

    • Buracos negros supermassivos : os monstros que se escondem no centro das galáxias 

      Storchi-Bergmann, Thaisa (2009) [Artigo de periódico]

    • Compact molecular disc and ionized gas outflows within 350 pc of the active nucleus of Mrk 1066 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa (2011) [Artigo de periódico]
      We present stellar and gaseous kinematics of the inner ≈350-pc radius of the Seyfert galaxy Mrk 1066 derived from J and Kl bands data obtained with the Gemini’s Near-Infrared Integral Field Spectrograph (NIFS) at a spatial ...

    • 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) [Artigo de periódico]
      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 ...

    • A dark energy camera search for missing supergiants in the LMC after the advanced LIGO gravitational-wave event GW150914 

      Annis, James T.; Soares-Santos, Marcelle; Berger, Edo; Brout, Dillon J.; Chen, Hsinyu; Chornock, Ryan; Cowperthwaite, Philip S.; Diehl, H. Thomas; Doctor, Z.; Drlica-Wagner, Alex; Drout, Maria R.; Farr, Benjamin F.; Finley, David A.; Flaugher, Brenna; Foley, Ryan Joseph; Frieman, Joshua A.; Gruendl, Robert A.; Herner, Kenneth R.; Holz, Daniel E.; Kessler, Richard S.; Lin, H.; Marriner, John P.; Neilsen, Eric H.; Rest, Armin; Sako, Masao; Smith, Matthew Wilson L.; Smith, Nathan D.; Sobreira, Flávia; Walker, Alistair; Yanny, Brian; Abbott, Timothy M. C.; Abdalla, Filipe B.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Buckley-Geer, Elizabeth; Burke, David Lyle; Capozzi, Diego; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Castander Serentill, Francisco Javier; Cenko, Stephen Bradley; Crocce, Martin; Cunha, Carlos Eduardo; D'Andrea, Christopher B.; Costa, Luiz N. da; Desai, S.; Dietrich, Jörg P.; Eifler, Tim; Evrard, August E.; Fernández, Eva María; Fischer, John A.; Fong, Wenfai; Fosalba Vela, Pablo; Fox, Derek B.; Fryer, Chris L.; García-Bellido, Juan; Gaztañaga, Enrique; Gerdes, David W.; Goldstein, Daniel Abraham; Gruen, Daniel; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Karliner, Inga; Kasen, Daniel N.; Kent, Stephen M.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Lima, Marcos Vinicius Borges Teixeira; Maia, Marcio Antonio Geimba; Martini, Paul; Metzger, Brian D.; Miller, Christopher J.; Miquel, Ramon; Mohr, Joseph J.; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Peoples, John; Petravick, Donald L.; Plazas Malagón, Andrés Alejandro; Quataert, Eliot J.; Romer, Anita K.; Roodman, Aaron; Rykoff, Eli; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Scarpine, Victor Emanuel; Schindler, Rafe H.; Schubnell, Michael; Sevilla Noarbe, Ignacio; Sheldon, Erin; Smith, Robert Christopher; Stebbins, Albert J.; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, Rollin C.; Tucker, Douglas L.; Vikram, Vinu; Wechsler, Risa H.; Weller, Jochen; Wester, William Carl; DES Collaboration (2016) [Artigo de periódico]
      The collapse of a stellar core is expected to produce gravitational waves (GWs), neutrinos, and in most cases a luminous supernova. Sometimes, however, the optical event could be significantly less luminous than a supernova ...

    • Double-peaked profiles : ubiquitous signatures of disks in the broad emission lines of active galactic nuclei 

      Storchi-Bergmann, Thaisa; Schimoia, Jáderson da Silva; Peterson, Bradley M.; Elvis, Martin; Denney, Kelly D.; Eracleous, Michael; Nemmen, Rodrigo S. (2017) [Artigo de periódico]
      Broad (10,000 km s−1), double-peaked emission-line profiles of Balmer lines emitted by active galactic nuclei (AGN) are thought to originate in the outer parts of an accretion disk surrounding a nuclear supermassive black ...

    • Elliptical accretion disks in active galactc nuclei 

      Eracleous, Michael; Livio, Mario; Halpen, Jules P.; Storchi-Bergmann, Thaisa (1995) [Artigo de periódico]
      We present a calculation of the profiles of emission lines originating in a relativistic, eccentric disk, and show examples of the resulting model profiles. Our calculations are motivated by the fact that in about one­ ...

    • Evolution of the nuclear accretion disk emission in NGC 1097 : getting closer to the black hole 

      Storchi-Bergmann, Thaisa; Nemmen, Rodrigo S.; Eracleous, Michael; Halpern, Jules P.; Wilson, Andrew S.; Filippenko, Alexei V.; Ruiz, Maria Teresa; Smith, Robert Christopher; Nagar, Neil M. (2003) [Artigo de periódico]
      We study the evolution of the broad, double-peaked H emission-line profile of the LINER/Seyfert 1 nucleus of NGC 1097, using 24 spectra obtained over a time span of 11 years—from 1991 November through 2002 October. While ...

    • Gas streaming motions towards the nucleus of M81 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Ferrari, Fabricio; Steiner, João Evangelista; Axon, David J.; Robinson, Andrew (2011) [Artigo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 120×250 pc2 of the LINER/Seyfert 1 galaxy M81, from optical spectra obtained with the Gemini Multi-Object Spectrograph (GMOS) integral field spectrograph ...

    • Gauging the effect of supermassive black holes feedback on quasar host galaxies 

      Oliveira, Bruno Dall'Agnol de; Storchi-Bergmann, Thaisa; Kraemer, S. B.; Villar-Martín, Montse; Müller, Allan Schnorr; Schmitt, Henrique Roberto; Dutra, Daniel Ruschel; Crenshaw, Daniel Michael; Fischer, Travis C. (2021) [Artigo de periódico]
      In order to gauge the role that active galactic nuclei play in the evolution of galaxies via the effect of kinetic feedback in nearby QSO 2’s (z ∼ 0.3), we observed eight such objects with bolometric luminosities Lbol∼1046ergs−1 ...

    • Gauss-Bonnet black holes in (2 + 1) dimensions : perturbative aspects and entropy features 

      Cuadros Melgar, Bertha María; Fontana, Rodrigo Dal Bosco; Oliveira, Jeferson de (UFMT) (2022) [Artigo de periódico]
      We investigate some aspects of the (2 þ 1)-dimensional Gauss-Bonnet black hole proposed in Hennigar et al. [Phys. Lett. B 808, 135657 (2020); Classical Quantum Gravity 38, 03LT01 (2021)]. The perturbations of scalar and ...

    • 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) [Artigo de periódico]
      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, ...

    • 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 ...