127 citations · 200 across the 2 of their papers we have counts for
7 papers
HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO
Nahum Arav, Martijn de Kool, Kirk T. Korista +16
We describe deep (40 orbits) HST/STIS observations of the BALQSO PG 0946+301 and make them available to the community. These observations are the major part of a multi-wavelength c…
On the Column Density of AGN Outflows: the Case of NGC 5548
Nahum Arav, Martijn de Kool, Kirk T. Korista
We re-analyze the HST high resolution spectroscopic data of the intrinsic absorber in NGC 5548 and find that the C IV absorption column density is at least four times larger than p…
Keck Hires Observations of the QSO First J104459.6+365605: Evidence for a Large Scale Outflow
Martijn de Kool, Nahum Arav, Robert H. Becker +5
This paper presents an analysis of a Keck HIRES spectrum of the QSO FIRST J104459.6+365605. The line of sight towards the QSO contains two clusters of outflowing clouds that give r…
Thermal Instability and Evaporation of Accretion Disc Atmospheres
Martijn de Kool, Dayal T. Wickramasinghe
We investigate the thermal stability of the outer layers of accretion discs in which the local viscous energy dissipation rate scales with the pressure as for standard Shakura-Suny…
What Determines the Depth of BALs? Keck HIRES Observations of BALQSO 1603+300
Nahum Arav, Robert H. Becker, Sally A. Laurent-Muehleisen +3
We find that the depth and shape of the broad absorption lines (BALs) in BALQSO 1603+3002 are determined largely by the fraction of the emitting source which is covered by the BAL…
Accretion disk reversal and the spin-up/spin-down of accreting pulsars
James R. Murray, Martijn de Kool, Jianke Li
We numerically investigate the hydrodynamics of accretion disk reversal and relate our findings to the observed spin-rate changes in the accreting X-ray pulsar GX~1+4. In this syst…