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44 papers · 2 filters
Jet Acceleration by Tangled Magnetic Fields
S. Heinz, M. C. Begelman
We explore the possibility that extragalactic radio jets might be accelerated by highly disorganized magnetic fields that are strong enough to dominate the dynamics until the termi…
The Evolutionary Status of SS433
Andrew R. King, Ronald E. Taam, Mitchell C. Begelman
We consider possible evolutionary models for SS 433. We assume that common-envelope evolution is avoided if radiation pressure is able to expel most of a super-Eddington accretion…
Feedback from Galaxy Formation: Escaping Ionizing Radiation from Galaxies at High Redshift
Massimo Ricotti, J. Michael Shull
Several observational and theoretical arguments suggest that starburst galaxies may rival quasars as sources of metagalactic ionizing radiation at redshifts z > 3. Reionization of…
On the lack of X-ray iron line reverberation in MCG-6-30-15: Implications for the black hole mass and accretion disk structure
C. S. Reynolds
We use the method of Press, Rybicki & Hewitt (1992) to search for time lags and time leads between different energy bands of the RXTE data for MCG-6-30-15. We tailor our search in…
Rotational velocities of low-mass stars in the Pleiades and Hyades
Donald M. Terndrup, John R. Stauffer, Marc H. Pinsonneault +5
We have obtained high-resolution spectra of 89 M dwarf members of the Pleiades and Hyades and have derived radial velocities, H-alpha equivalent widths, and spectroscopic rotationa…
Zero-Metallicity Stars and the Effects of the First Stars on Reionization
Jason Tumlinson, J. Michael Shull
We present stellar structure and atmosphere models of metal-free stars and examine them from a cosmological point of view. Metal-free stars exhibit high effective temperatures and…