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Remarkable Spectral Variability of PDS 456
Ehud Behar, Shai Kaspi, James Reeves +3
We report on the highest to date signal-to-noise-ratio X-ray spectrum of the luminous quasar PDS 456, as obtained during two XMM-Newton orbits in September 2007. The present spectr…
X-Ray Absorption Analysis of MCG-6-30-15: Discerning Three Kinematic Systems
Tomer Holczer, Ehud Behar, Nahum Arav
By analyzing the X-ray spectrum of MCG-6-30-15 obtained with the HETG spectrometer on board the Chandra Observatory, we identify three kinematically distinct absorption systems; tw…
MHD Accretion-Disk Winds as X-ray Absorbers in AGNs
Keigo Fukumura, Demosthenes Kazanas, Ioannis Contopoulos +1
We present the 2D ionization structure of self-similar MHD winds off accretion disks around irradiated by a central X-ray source. Based on earlier observational clues and theoretic…
XMM-Newton detection of a transient X-ray source in the vicinity of V838 Monocerotis
Fabio Antonini, Rodolfo Jr. Montez, Joel H. Kastner +5
We report the XMM-Newton/EPIC detection in 2008 March of a luminous (L_X ~ 10^32-33 erg/s), variable X-ray source in the vicinity (within ~6") of the enigmatic star V838 Mon, which…
Density Profiles in Seyfert Outflows
Ehud Behar
For the past decade, ionized outflows of a few 100 km/s from nearby Seyfert galaxies have been studied in great detail using high resolution X-ray absorption spectra. A recurring f…
A Compton-thick Wind in the High Luminosity Quasar, PDS 456
J. N. Reeves, P. T. O'Brien, V. Braito +7
PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS…
Narrow Radiative Recombination Continua: A Signature of Ions Crossing the Contact Discontinuity of Astrophysical Shocks
Raanan Nordon, Ehud Behar, Noam Soker +2
X-rays from planetary nebulae (PNs) are believed to originate from a shock driven into the fast stellar wind (v ~ 1000 km/s) as it collides with an earlier circumstellar slow wind…