Browsing by Subject "galaxies: active"

Now showing items 1-20 of 27

    • Active galactic nuclei at z ˜ 1.5 - I. Spectral energy distribution and accretion discs 
      Capellupo, D. M.; Netzer, H.; Lira Teillery, Paulina; Trakhtenbrot, B.; Mejía-Restrepo, Julian (Royal Astronomical Society, 2015)
      The physics of active super massive black holes (BHs) is governed by their mass (MBH), spin (a∗), and accretion rate (M˙ ). This work is the first in a series of papers with the aim of testing how these parameters determine ...
    • Black hole mass and growth rate at high redshift 
      Netzer, Hagai; Lira Teillery, Paulina; Trakhtenbrot, Benny; Shemmer, Ohad; Cury, Iara (2007-12-20)
      We present new H- and K-band spectroscopy of 15 high-luminosity active galactic nuclei (AGNs) at redshifts 2.3Y3.4 obtained with Gemini South.We combined the data with spectra of an additional 29 high-luminosity sources to ...
    • BLACK HOLE MASS AND GROWTH RATE AT z 4.8: A SHORT EPISODE OF FAST GROWTH FOLLOWED BY SHORT DUTY CYCLE ACTIVITY. 
      Trakhtenbrot, Benny; Netzer, Hagai; Lira Teillery, Paulina; Shemmer, Ohad (IOP Publishing., 2011-03-20)
      We present newH-band spectroscopy for a flux-limited sample of 40 z 4.8 active galactic nuclei, selected from the Sloan Digital Sky Survey. The sample probably contains the most massive active black holes (BHs) at this ...
    • Correlation and time delays of the X-ray and optical emission of the Seyfert Galaxy NGC 3783 
      Arévalo, P.; Uttley, P.; Lira Teillery, Paulina; Breedt, E.; McHardy, I. M.; Churazov, E. (WILEY-BLACKWELL, 2009-08-21)
      We present simultaneous X-ray and optical B- and V-band light curves of the Seyfert Galaxy NGC 3783 spanning 2 years. The flux in all bands is highly variable and the fluctuations are significantly correlated. As shown ...
    • Detection of rest-frame optical lines from x-shooter spectroscopy of weak emission-line quasars 
      Plotkin, Richard; Shemmer, Ohad; Trakhtenbrot, Benny; Anderson, Scott; Brandt, W.; Fan, Xiaohui; Gallo, Elena; Lira Teillery, Paulina; Luo, Bin; Richards, Gordon; Schneider, Donald; Strauss, Michael; Wu, Jianfeng (The American Astronomical Society, 2015-06-01)
      Over the past 15 yr, examples of exotic radio-quiet quasars with intrinsically weak or absent broad emission line regions (BELRs) have emerged from large-scale spectroscopic sky surveys. Here, we present spectroscopy ...
    • Differences between CO- and calcium triplet-derived velocity dispersions in spiral galaxies: evidence for ... 
      Riffel, Rogemar A.; Ho, Luis; Mason, Rachel; Rodríguez Ardila, Alberto; Martins, Lucimara; Riffel, Rogerio; Diaz, Ruben; Colina, Luis; Alonso-Herrero, Almudena; Flohic, Helene; González, Omaira; Lira Teillery, Paulina; McDermid, Richard; Ramos Almeida, Cristina; Schiavon, Ricardo; Thanjavur, Karun; Ruschel-Dutra, Daniel; Winge, Claudia; Perlman, Eric (Royal Astronomical Society, 2015)
      We examine the stellar velocity dispersions (σ) of a sample of 48 galaxies, 35 of which are spirals, from the Palomar nearby galaxy survey. It is known that for ultra-luminous infrared galaxies (ULIRGs) and merger remnants, ...
    • Environments of strong/ultrastrong, ultraviolet Fe II emitting quasars 
      Clowes, Roger G.; Raghunathan, Srinivasan; Söchting, Ilona K.; Graham, Matthew J.; Campusano Brown, Luis (Oxford University Press, 2013-06)
      We have investigated the strength of ultraviolet (UV) Fe II emission from quasars within the environments of large quasar groups (LQGs) in comparison with quasars elsewhere, for 1.1 ≤ ¯zLQG ≤ 1.7, using the DR7QSO catalogue ...
    • Exploratory x-ray monitoring of luminous radio-quiet quasars at high redshift: initial results 
      Shemmer, Ohad; Brandt, W. N.; Paolillo, Maurizio; Kaspi, Shai; Vignali, Cristian; Stein, Matthew S.; Lira Teillery, Paulina; Schneider, Donald P.; Gibson, Robert R. (The Astrophysical Journal, 2014-03-10)
      We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 z 4.35, monitored by Chandra, and ...
    • Extreme star formation in the host galaxies of the fastest growing supermassive black holes AT z = 4.8 
      Mor, Rivay; Netzer, Hagai; Trakhtenbrot, Benny; Shemmer, Ohad; Lira Teillery, Paulina (2012-04-20)
      We report new Herschel observations of 25 z 4.8 extremely luminous optically selected active galactic nuclei (AGNs). Five of the sources have extremely large star-forming (SF) luminosities, LSF, corresponding to SF ...
    • High-redshift x-ray–selected quasars: CXOCY J125304.0_090737 joins the club 
      Castander, Francisco J.; Treister, Ezequiel; Maccarone, Thomas J.; Coppi, Paolo S.; Maza Sancho, José; Zepf, Septenio E.; Guzmán, Rafael (2003-04)
      We present a new X-ray–selected high-redshift quasar CXOCY J125304.0 090737 at z = 4.179, discovered by the Cala´n-Yale Deep Extragalactic Research (CYDER) Survey. This quasar is the fifth X-ray– selected high-redshift ...
    • MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-loud Blazars 
      Lister, M. L.; Homan, D. C.; Hovatta, T.; Kellermann, K. I.; Kiehlmann, S.; Kovalev, Y. Y.; Max-Moerbeck, W.; Pushkarev, A. B.; Readhead, A. C.S.; Ros, E.; Savolainen, T. (Institute of Physics Publishing, 2019)
      © 2019. The American Astronomical Society. All rights reserved. We present results from a parsec-scale jet kinematics study of 409 bright radio-loud active galactic nuclei (AGNs) based on 15 GHz Very Long Baseline Array ...
    • Near-infrared imaging and spectroscopy of the nuclear region of the disturbed Virgo cluster spiral NGC4438 
      Pérez, Sebastián; Casassus Montero, Simón; Cortés, Juan R.; Kenney, Jeffrey D. P. (2009)
      We present near-infrared (NIR) Very Large Telescope (VLT) Infrared Spectrometer and Array Camera (ISAAC) imaging and spectroscopy of the peculiar Virgo galaxy NGC4438, whose nucleus has been classified as a low-ionization ...
    • The Nuclear Near-Infrared Spectral Properties of Nearby Galaxies 
      Mason, R. E.; Rodríguez-Ardila, A.; Martins, L.; Riffel, R.; González Martín, O.; Ramos Almeida, C.; Ruschel Dutra, D.; Ho, L. C.; Thanjavur, K.; Flohic, H.; Alonso Herrero, A.; Lira Teillery, Paulina; McDermid, R.; Riffel, R. A.; Schiavon, R. P.; Winge, C.; Hoenig, M. D.; Perlman, E. (2015-03)
      We present spectra of the nuclear regions of 50 nearby (D = 1–92 Mpc, median = 20 Mpc) galaxies of morphological types E to Sm. The spectra, obtained with the Gemini Near-IR Spectrograph on the Gemini North telescope, ...
    • P-MaNGA Galaxies: emission-lines properties – gas ionization and chemical abundances from prototype observations 
      Blanc Mendiberri, Guillermo; Belfiore, F.; Maiolino, R.; Bundy, K.; Thomas, D.; Maraston, C.; Wilkinson, D.; Sanchez, S. F.; Bershady, M.; Bothwell, M.; Cales, S. L.; Coccato, L.; Drory, N.; Emsellem, E.; Fu, H.; Gelfand, J.; Law, D.; Masters, K.; Parejko, J.; Tremonti, C.; Wake, D.; Weijmans, A.; Yan, R.; Xiao, T.; Zhang, K.; Zheng, T.; Bizyaev, D.; Kinemuchi, K.; Oravetz, D.; Simmons, A. (Royal Astronomical Society, 2015)
      MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a 6-yr Sloan Digital Sky Survey (SDSS-IV) survey that will obtain spatially resolved spectroscopy from 3600 to 10 300 Å for a representative sample of over ...
    • Searching for molecular outflows in hyperluminous infrared galaxies 
      Calderón, D.; Bauer, F. E.; Veilleux, S.; Gracia Carpio, J.; Sturm, E.; Lira Teillery, Paulina; Schulze, S.; Kim, S. (2016)
      We present constraints on the molecular outflows in a sample of five hyperluminous infrared galaxies using Herschel observations of the OH doublet at 119 mu m. We have detected the OH doublet in three cases: one purely in ...
    • Southern ultraluminous infrared galaxies: An optical and infrared database 
      Duc, P. A.; Mirabel, I. F.; Maza Sancho, José (1997)
      We have carried out an optical and infrared study of 24 ultraluminous infrared galaxies in the southern hemisphere (SULIRGs). This flux limited, complete sample, has been extracted from the redshift survey of IRAS ...
    • Space telescope and optical reverberation mapping project. iv. anomalous behavior of the broad ultraviolet ... 
      Goad, M. R.; Korista, K. T.; De Rosa, G.; Kriss, G. A.; Edelson, R.; Barth, A. J.; Ferland, G. J.; Kochanek, C. S.; Netzer, H.; Peterson, B. M.; Bentz, M. C.; Bisogni, S.; Crenshaw, D. M.; Denney, K. D.; Ely, J.; Fausnaugh, M. M.; Grier, C. J; Gupta, A.; Horne, K. D.; Kaastra, J.; Pancoast, A.; Pei, L.; Pogge, R. W.; Skielboe, A.; Kaastra, J.; Pancoast, A.; Pei, L.; Pogge, R. W.; Skielboe, A.; Starkey, D.; Vestergaard, M.; Zu, Y.; Anderson, M. D.; Arévalo, P.; Bazhaw, C.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brandt, W. N.; Breeveld, A. A.; Brewer, B. J.; Cackett, E. M.; Carini, M. T.; Croxall, K. V.; Dalla Bonta, E.; De Lorenzo Cáceres, A.; Dietrich, M.; Efimova, N. V.; Evans, P. A.; Filippenko, A. V.; Flatland, K.; Gehrels, N.; Geier, S.; Gelbord, J. M.; González, L.; Gorjian, V.; Grupe, D.; Hall, P. B.; Hicks, S.; Horenstein, D.; Hutchison, T.; Im, M.; Jensen, J. J.; Joner, M. D.; Jones, J.; Kaspi, S.; Kelly, B. C.; Kennea, J. A.; Kim, M.; Kim, S. C.; Klimanov, S. A.; Lee, J. C.; Leonard, D. C.; Lira Teillery, Paulina; MacInnis, F.; Manne-Nicholas, E. R.; Mathur, S.; McHardy, I. M.; Montouri, C.; Musso, R.; Nazarov, S. V.; Norris, R. P.; Nousek, J. A.; Okhmat, D. N.; Papadakis, I.; Parks, J. R.; Pott, J. U.; Rafter, S. E.; Rix, H. W.; Saylor, D. A.; Schimoia, J. S; Schnuelle, K.; Sergeev, S. G.; Siegel, M.; Spencer, M.; Sung, H. I.; Teems, K. G.; Treu, T.; Turner, C. S.; Uttley, P.; Villforth, C.; Weiss, Y.; Woo, J. H.; Yan, H.; Young, S.; Zheng, W. K. (IOP Publishing, 2016)
      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 ...
    • Spatially Resolved Outflows in a Seyfert Galaxy at z =2.39 
      Fischer, Travis C.; Rigby, J. R.; Mahler, G.; Gladders, M.; Sharon, K.; Florian, M.; Kraemer, S.; Bayliss, M.; Dahle, H.; Barrientos, L. Felipe; Lopez, S.; Tejos, N.; Johnson, T.; Wuyts, E. (Institute of Physics Publishing, 2019)
      We present the first spatially resolved analysis of rest-frame optical and UV imaging and spectroscopy for a lensed galaxy at z =2.39 hosting a Seyfert active galactic nucleus (AGN). Proximity to a natural guide star has ...
    • Star formation and black hole growth at z 4.8 
      Netzer, Hagai; Mor, Rivay; Trakhtenbrot, Benny; Shemmer, Ohad; Lira Teillery, Paulina (The American Astronomical Society, 2014-08-08)
      We report Herschel/SPIRE, Spitzer and Wide-field Infrared Survey Explorer observations of 44 z 4.8 optically selected active galactic nuclei (AGNs). This flux-limited sample contains the highest mass black holes (BHs) ...
    • Star formation black hole growth and dusty tori in the most luminous agns AT Z = 2–3.5 
      Netzer, Hagai; Lani, Caterina; Nordon, Raanan; Trakhtenbrot, Benny; Lira Teillery, Paulina; Shemmer, Ohad (The American Astronomical Society, 2016-03-10)
      We report Herschel/SPIRE observations of 100 very luminous, optically selected active galactic nuclei (AGNs) at $z=2\mbox{--}3.5$ with $\mathrm{log}$ ${L}_{{\rm{1350}}}$ (erg s−1) ≥ 46.5 , where ${L}_{{\rm{1350}}}$ is λLλ ...