Julian Krolik

Learn More
Most streamline generation algorithms either provide a particular density of streamlines across the domain or explicitly detect features, such as critical points, and follow customized rules to emphasize those features. However, the former generally includes many redundant streamlines, and the latter requires Boolean decisions on which points are features(More)
  • Rick Edelson, Anuradha Koratkar, Kirpal Nandra, Michael Goad, Bradley M Peterson, Stefan Collier +7 others
  • 1999
During 1998 April 13–16, the bright, strongly variable Seyfert 1 galaxy NGC 3516 was monitored almost continuously with HST for 10.3 hr at ultraviolet wavelengths and 2.8 d at optical wavelengths, and simultaneous RXTE and ASCA monitoring covered the same period. The X-ray fluxes were strongly variable with the soft (0.5–2 keV) X-rays showing stronger(More)
We calculate the ux and spectrum of-rays emitted by a two-temperature advection-dominated accretion ow (ADAF) around a black hole. The-rays are from the decay of neutral pions produced through proton-proton collisions. We discuss both thermal and power-law distributions of proton energies and show that the-ray spectra in the two cases are very diierent. We(More)
  • Kristen Menou, Daniel E Vanden Berk, ˇ Zeljko Ivezi´c, Rita S J Kim, Gillian R Knapp, Gordon T Richards +21 others
  • 2008
We present 13 Broad Absorption Line (BAL) quasars, including 12 new objects, which were identified in the Sloan Digital Sky Survey (SDSS) and matched within 2 ′′ to sources in the FIRST radio survey catalog. The surface density of this sample of radio BAL quasars is 4.5 ± 1.2 per 100 deg 2 , i.e. approximately 4 times larger than previously found by the(More)
MHD turbulence is generally believed to have two important functions in accretion disks: it transports angular momentum outward, and the energy in its shortest wavelength modes is dissipated into the heat that the disks radiate. In this paper we examine a pair of mechanisms which may play an important role in regulating the amplitude and spectrum of this(More)
  • 1