402 citations · 1.2k across the 9 of their papers we have counts for
9 papers
180 Rotations in the Polarization Angle for Blazars
Marshall H. Cohen, Tuomas Savolainen
Rotations of the electric vector position angle (EVPA) in blazars are often close to an integral multiple of 180. There are multiple examples of this in the literature, and…
MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
M. L. Lister, H. D. Aller, M. F. Aller +9
We present images from a long term program (MOJAVE: Monitoring of Jets in AGN with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena associated…
Spectropolarimetry of Broad H_alpha Lines and Geometry of the BLR
Marshall H. Cohen, Andre' R. Martel
In a small fraction of Broad Line Radio Galaxies (BLRG) and Seyfert 1 galaxies, the polarization position angle rotates across the broad emission lines, especially at H_alpha. An u…
Radio galaxies at z~2.5: results from Keck spectropolarimetry
J. Vernet, R. A. E. Fosbury, M. Villar-Martin +4
In classifying the ensemble of powerful extragalactic radio sources, considerable evidence has accumulated that radio galaxies and quasars are orientation-dependent manifestations…
Keck Observations of the Hidden Quasar IRAS P09104+4109
Hien D. Tran, M. H. Cohen, M. Villar-Martin
We present imaging and spectro- polarimetric observations of the ultraluminous infrared galaxy IRAS P09104+4109 using the Keck 10-m Telescope. We detect the clear presence of broad…
Polarimetry and Unification of Low-Redshift Radio Galaxies
M. H. Cohen, P. M. Ogle, H. D. Tran +2
We have made high-quality measurements of the polarization spectra of 13 FR II radio galaxies and taken polarization images for 11 of these with the Keck telescopes. Seven of the e…