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PSR J1903+0327 : A Unique Milli-Second Pulsar with a Main-Sequence Companion Star
Juthika Khargharia, John T. Stocke, Cynthia S. Froning +2
PSR J1903+0327 is a mili-second pulsar with a mass of 1.67 M_{\odot} in a highly eccentric orbit (e=0.44) around a main-sequence star. This unique system cannot be reconciled with…
The Cosmic Origins Spectrograph
James C. Green, Cynthia S. Froning, Steve Osterman +23
The Cosmic Origins Spectrograph (COS) is a moderate-resolution spectrograph with unprecedented sensitivity that was installed into the Hubble Space Telescope (HST) in May 2009, dur…
An HST/COS Search for Warm-Hot Baryons in the Mrk421 Sightline
Charles W. Danforth, John T. Stocke, Brian A. Keeney +4
Thermally-broadened Lya absorbers (BLAs) offer an alternate method to using highly-ionized metal absorbers (OVI, OVII, etc.) to probe the warm-hot intergalactic medium (WHIM, T=10^…
The Evolution of Radio Galaxies and X-ray Point Sources in Coma Cluster Progenitors Since z~1.2
Quyen N. Hart, John T. Stocke, August E. Evrard +2
Using Chandra imaging spectroscopy and Very Large Array (VLA) L-band radio maps, we have identified radio sources at P_{1.4GHz} >=5x10^{23} W Hz^{-1} and X-ray point sources (XPSs)…
Broad Ly alpha Emission from Three Nearby BL Lacertae Objects
John T. Stocke, Charles W. Danforth, Eric S. Perlman
We present far-UV HST/COS spectra of four nearby BL Lac Objects. BL Lac spectra are dominated by a smooth, power-law continuum which arises in a relativistic jet. However, the spec…
Spectropolarimetric Evidence for Radiatively Inefficient Accretion in an Optically Dull Active Galaxy
Jonathan R. Trump, Tohru Nagao, Hiro Ikeda +9
We present Subaru/FOCAS spectropolarimetry of two active galaxies in the Cosmic Evolution Survey. These objects were selected to be optically dull, with the bright X-ray emission o…