Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Gerard A. Kriss"'
Autor:
José L. Gómez, S. Komossa, Dirk Grupe, Michael Parker, M. Zetzl, Maria Santos-Lleo, Dan R. Wilkins, Luigi C. Gallo, N. Schartel, Gerard A. Kriss, Karen M. Leighly, Anna Lia Longinotti, Wolfram Kollatschny
Publikováno v:
Proceedings of the International Astronomical Union. 12:168-171
We present results from our ongoing monitoring programs aimed at identifying and understanding Active Galactic Nuclei (AGN) in extreme flux and spectral states. Observations of AGN in extreme states can reveal the nature of the inner accretion flow,
Autor:
Laura Ferrarese, Holland C. Ford, L. Dressel, Gerard A. Kriss, W. Jaffe, R. J. Harms, Zlatan Tsvetanov
Publikováno v:
NASA Astrophysics Data System
HST images have led to the discovery that small (r ~ 1″ r ~ 100 – 200 pc), well-defined, gaseous disks are common in the nuclei of elliptical galaxies. Measurements of rotational velocities in the disks provide a means to measure the central mass
Autor:
Gerard A. Kriss, Avery Meiksin, Scott F. Anderson, Daryl Haggard, Donald G. York, Wei Zheng, Scott Burles, D. P. Schneider, Craig J. Hogan, Kuenley Chiu
Publikováno v:
Proceedings of the International Astronomical Union. 1:484-486
Autor:
Nahum Arav, Jack R. Gabel, Jennifer E. Scott, K. C. Steenbrugge, Jelle Kaastra, Gerard A. Kriss
Publikováno v:
Proceedings of the International Astronomical Union. 2004:321-322
We present the analysis of intrinsic UV absorption in the Seyfert 1 galaxy Mrk 279, observed simultaneously with HST /STIS (40 ks) and FUSE (92 ks). To derive the absorption covering factors and ionic column densities, we employ an algorithm based on
Publikováno v:
Symposium - International Astronomical Union. 217:364-365
Markarian 478 is the prototype narrow-line Seyfert 1 galaxy. Based on its spectra taken by the FUSE, HST/FOS, and Kitt Peak Observatory 2m Telescope, we find a tendency that the emission lines of increasing ionization level show increasing excess flu
Publikováno v:
Symposium - International Astronomical Union. 119:253-259
We present results of studies carried out with the imaging instruments on the Einstein Observatory. We summarize a statistical analysis of the X-ray properties of optically selected, radio quiet quasars including nine new high redshift quasars detect