Browsing University of Hertfordshire by Author "Kaastra, J. S."

Now showing items 1-2 of 2

    • 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) ...