Browsing by Author "Ebrero, J."

Now showing items 1-6 of 6

    • The Nature of X-ray Absorbed Starburst QSOs and the QSO Evolutionary Scheme 

      Page, M. J.; Carrera, F.J.; Ebrero, J.; Stevens, Jason; Ivison, Rob J. (European Space Agency (ESA), 2006-01-01)
      In contradiction to the simple AGN unification schemes, there exists a significant population of broad line, z ~ 2 QSOs which have heavily absorbed X-ray spectra. These objects have luminosities and redshifts characteristic ...

    • The nature of X-ray-absorbed quasi-stellar objects 

      Page, M. J.; Carrera, F. J.; Stevens, J. A.; Ebrero, J.; Blustin, A. J. (2011-10)
      There exists a significant population of broad line, z similar to 2 quasi-stellar objects ( QSOs) which have heavily absorbed X-ray spectra. Follow-up observations in the submillimetre show that these QSOs are embedded in ...

    • A strongly star-forming group : three massive galaxies associated with a quasi-stellar object 

      Carrera, F. J.; Page, M. J.; Stevens, J. A.; Ivison, R. J.; Dwelly, T.; Ebrero, J.; Falocco, S. (2011-06)
      We present here photometric redshift confirmation of the presence of large-scale structure around the z = 1.82 quasi-stellar object (QSO) RX J0941, which shows an overdensity of submillimetre (submm) sources. Radio imaging ...

    • Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019 

      Mao, Junjie; Kaastra, J. S.; Mehdipour, M.; Kriss, G. A.; Wang, Yijun; Grafton-Waters, S.; Branduardi-Raymont, G.; Pinto, C.; Landt, H.; Walton, D. J.; Costantini, E.; Gesu, L. Di; Bianchi, S.; Petrucci, P. -O.; Marco, B. De; Ponti, G.; Fukazawa, Yasushi; Ebrero, J.; Behar, E. (2022-09-12)
      Context. A growing number of transient X-ray obscuration events in type I active galactic nuclei suggest that our line of sight to the central engine is not always free. Multiple X-ray obscuration events were reported in ...

    • Transient obscuration event captured in NGC 3227. I. Continuum model for the broadband spectral energy distribution 

      Mehdipour, M.; Kriss, G. A.; Kaastra, J. S.; Wang, Y.; Mao, J.; Costantini, E.; Arav, N.; Behar, E.; Bianchi, S.; Branduardi-Raymont, G.; Brotherton, M.; Cappi, M.; Marco, B. De; Gesu, L. Di; Ebrero, J.; Grafton-Waters, S.; Kaspi, S.; Matt, G.; Paltani, S.; Petrucci, P. -O.; Pinto, C.; Ponti, G.; Ursini, F.; Walton, D. J. (2021-06-28)
      From Swift monitoring of a sample of active galactic nuclei (AGN) we found a transient X-ray obscuration event in Seyfert-1 galaxy NGC 3227, and thus triggered our joint XMM-Newton, NuSTAR, and Hubble Space Telescope (HST) ...

    • The XMM-Newton and Spitzer View of Galaxy/AGN Formation at z = 2-3 

      Carrera, F.J.; Ebrero, J.; Page, M. J.; Stevens, Jason (European Space Agency (ESA), 2006-01-01)
      The genesis of spheroids is central to our understanding of galaxy formation. They contain half of the stellar mass of the Universe, and almost all of the black hole mass. According to galaxy formation models, cluster ...