4 papers · 1 filter
A Search for the Optical Counterpart of PSR B1951+32 in the Supernova Remnant CTB 80
Creidhe O'Sullivan, A. Shearer, M. Colhoun +8
Using time-resolved two-dimensional aperture photometry we have put upper limits on the pulsed emission from two proposed optical counterparts for PSR B1951+32. Our pulsed upper li…
Time-Resolved Optical Observations of PSR 1509-58
A. Shearer, C. M. M. O' Sullivan, A. Golden +4
Using time resolved 2-dimensional aperture photometry we have established that the optical candidate for PSR 1509-58 does not pulse. Our pulsed upper limits (m_V = 24.3 and m_B = 2…
Pulsed optical emission from Geminga
A. Shearer, A. Golden, S. Harfst +9
We present optical data which shows that G", the optical counterpart of the gamma-ray pulsar Geminga, pulses in B with a period of 0.237 seconds. The similarity between the optical…
Galaxy Clusters and Large Scale Structure at High Redshifts
Paul J. Francis, Bruce E. Woodgate, Anthony C. Danks
We present a detailed study of a rich galaxy cluster at z=2.38. We demonstrate that this cluster contains large overdensities of damped Ly-alpha absorption lines, of Ly-alpha emitt…