Browsing by Author "Shemmer, Ohad"

Now showing items 1-8 of 8

    • 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 ...
    • 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 ...
    • Exploratory X-Ray monitoring of luminous radio-quiet quasars at high redshift: extended time-series analyses ... 
      Thomas, Marcus O.; Shemmer, Ohad; Brandt, W. N.; Paolillo, Maurizio; Kaspi, Shai; Vignali, Cristian; Lira Teillery, Paulina Maria; Schneider, Donald P. (IOP, 2021)
      The Astrophysical Journal The American Astronomical Society, find out more The Institute of Physics, find out more Exploratory X-Ray Monitoring of Luminous Radio-quiet Quasars at High Redshift: Extended ...
    • 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 ...
    • 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 American Astronomical Society, 2014)
      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 ...
    • 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) ...