7 papers · 1 filter
The Baryon Content of the Local Intergalactic Medium
John T. Stocke, J. Michael Shull, Steven V. Penton
We describe our surveys of low column density Lyman-alpha absorbers [N(HI) = 10^(12.5-16.0) cm^-2], which show that the warm photoionized IGM contains 30% of all baryons at z < 0.1…
Hidden BL Lacertae Objects Near and Far
John T. Stocke
I describe two difficulties with current research into the cosmic evolution of BL Lacertae Objects: (1). Possible sample incompleteness due to unrecognized (i.e., ``hidden'') BL La…
Surveys and the Blazar Parameter Space
E. S. Perlman, P. Padovani, H. Landt +5
The rareness of blazars, combined with the previous history of relatively shallow, single-band surveys, has dramatically colored our perception of these objects. Despite a quarter-…
Interstellar Gas and Star Formation Near the Peculiar Radio Galaxy NGC 4410A
Beverly J. Smith, Megan Donahue, John Stocke
We present new multi-wavelength data for the NGC 4410 galaxy group. This group contains the peculiar radio galaxy NGC 4410A, which has a distorted double-lobed radio structure. NGC…
FUSE Observations of the Low-Redshift Lyman-beta Forest
J. M. Shull, M. L. Giroux, S. V. Penton +10
We describe a moderate-resolution (20-25 km/s) FUSE study of the low-redshift intergalactic medium. We report on studies of 7 extragalactic sightlines and 12 Ly-beta absorbers that…
The Second Most Distant Cluster of Galaxies in the EMSS
Megan Donahue, G. Mark Voit, Caleb A. Scharf +4
We report on our ASCA, Keck, and ROSAT observations of MS1137.5+6625, the second most distant cluster of galaxies in the Einstein Extended Medium Sensitivity Survey (EMSS), at reds…