Browsing by Subject "Quasars: general"

Now showing items 1-10 of 10

    • Active galactic nuclei at z ∼ 1.5 – II. Black hole mass estimation by means of broad emission lines 
      Mejía Restrepo, Julián; Trakhtenbrot, Benny; Lira Teillery, Paulina; Netzer, H.; Capellupo, Daniel (Oxford University Press, 2016)
      This is the second in a series of papers aiming to test how the mass (M-BH), accretion rate (M) over dot and spin (a(*)) of supermassive black holes (SMBHs) determine the observed properties of type I active galactic nuclei ...
    • ALMA Observations Show Major Mergers among the Host Galaxies of Fast-growing, High-redshift, Supermassive ... 
      Trakhtenbrot, Benny; Lira Teillery, Paulina; Netzer, Hagai; Cicone, Claudia; Maiolino, Roberto; Shemmer, Ohad (IOP Publishing, 2017)
      We present new ALMA band-7 data for a sample of six luminous quasars at z similar or equal to 4.8, powered by fast-growing supermassive black holes (SMBHs) with rather uniform properties: the typical accretion rates and ...
    • Can we improve CIV-based single-epoch black hole mass estimations? 
      Mejía Restrepo, Julián; Trakhtenbrot, B.; Lira Teillery, Paulina; Netzer, H. (Oxford University Press, 2018)
      In large optical surveys at high redshifts (z > 2), the C IV λ1549 broad emission line is the most practical alternative to estimate the mass (MBH) of active supermassive black holes. However, mass determinations obtained ...
    • A herschel study of 24 mu m-selected AGNs and their host galaxies 
      Xu, Lei; Rieke, G. H.; Egami, E.; Pereira, M. J.; Haines, Chris; Smith, G. P. (IOP Publishing, 2015)
      We present a sample of 290 24 mu m-selected active galactic nuclei (AGNs) mostly at z similar to 0.3-2.5, within 5.2 deg(2) distributed as 25' x 25' fields around each of 30 galaxy clusters in the Local Cluster Substructure ...
    • A New Look at Quasar Accretion Disks 
      Capellupo, Daniel M.; Netzer, Hagai; Lira Teillery, Paulina; Trakhtenbrot, Benny; Mejía Restrepo, Julián (International Astronomical Union, 2013)
      The physics of active black holes (BHs) is governed by three key parameters: their mass, spin, and accretion rate. Understanding the cosmic evolution of these parameters is crucial for tracing back the growth of the BHs ...
    • Photometric classification of quasars from RCS-2 using Random Forest 
      Carrasco, D.; Barrientos, L.; Pichara, K.; Anguita, T.; Murphy, D.; Gilbank, D.; Gladders, M.; Yee, H.; Hsieh, B.; López Morales, Sebastián (EDP Sciences, 2015)
      The classification and identification of quasars is fundamental to many astronomical research areas. Given the large volume of photometric survey data available in the near future, automated methods for doing so are ...
    • The Quest-La Silla AGN Variability Survey 
      Cartier Ugarte, Regis; Lira Teillery, Paulina; Coppi, Paolo; Sánchez, Paula; Arévalo, Patricia; Bauer, Franz; Rabinowitz, David; Zinn, Robert; Muñoz Vidal, Ricardo Rodrigo; Meza, Nicolás (IOP Pub., 2015)
      We present the characterization and initial results from the QUEST–La Silla active galactic nucleus (AGN) variability survey. This is an effort to obtain well-sampled optical light curves in extragalactic fields with ...
    • The relation between luminous AGNs and star formation in their host galaxies 
      Xu, Lei; Rieke, G. H.; Egami, E.; Haines, Chris; Pereira, M. J.; Smith, G. P. (IOP Publishing, 2015)
      We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters in ...
    • The 31 DEG2 release of the stripe 82 X-RAY survey: the point source catalog 
      LaMassa, Stephanie; Urry, C. Megan; Cappellut, Nico; Böhringer, Hans; Comastri, Andrea; Glikman, Eilat; Richards, Gordon; Ananna, Tonima; Brusa, Marcella; Cardamone, Carie; Chon, Gayoung; Civano, Francesca; Farrah, Duncan; Gilfanov, Marat; Green, Paul; Komossa, S.; Lira Teillery, Paulina; Makler, Martin; Marchesi, Stefano; Pecoraro, Robert; Ranalli, Piero; Salvato, Mara; Schawinski, Kevin; Stern, Daniel; Treister, Ezequiel; Viero, Marco (The American Astronomical Society, 2016-02-01)
      We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are ...
    • Type 2 AGN host galaxies in the Chandra-COSMOS Legacy Survey: No evidence of AGN-driven Quenching 
      Suh, Hyewon; Civano, Francesca; Hasinger, Guenther; Lusso, Elisabeta; Lanzuisi, Giorgio; Marchesi, Stefano; Trakhtenbrot, Benny; Allevato, Viola; Cappelluti, Nico; Capak, Peter L.; Elvis, Martin; Griffiths, Richard E.; Laigle, Clotilde; Lira Teillery, Paulina; Riguccini, Laurie; Rosario, David J.; Salvato, Mara; Schawinski, Kevin; Vignali, Cristian (IOP Publishing, 2017-06-01)
      We investigate the star formation properties of a large sample of similar to 2300 X-ray-selected Type 2 Active Galactic Nuclei (AGNs) host galaxies out to z similar to 3 in the Chandra COSMOS Legacy Survey in order to ...