We construct the first X-ray selected sample of radio-loud quasars from the EMSS survey. The X–ray selection allows us to explore the properties of radio–loud quasars 10–100 weaker than classical samples in the radio band. There are no radio–loud quasars whose synchrotron peak reaches the UV–soft X–ray band at these (radio) flux levels (as occurs for BL Lac objects selected in the X–ray band), ...

We present a spectral analysis of the narrow-line Seyfert 1 galaxy I Zwicky 1, focusing on the characteristics of the ionised absorbers as observed with XMM-Newton in 2005. The soft X-ray spectrum shows absorption by two components of ionised gas with a similar column density (N H ∼ 10 21 cm −2) and ionisation parameters log ξ ∼ 0 and 2.5. Comparing this observation with a 2002 XMM-Newton data ...

Archival X-ray observations of EF Eridani obtained in a low state revealed distinct X-ray detections at a luminosity L X ≃ 2 × 10 29 ergs −1 , three orders of magnitude below its high state value. The plasma temperature was found to be as low as kT < ≈ 2 keV, a factor 10 below the high state. The X-ray/UV/IR spectral energy distribution suggests faint residual accretion rather than coronal emis...

We present Chandra observations of two radio-quiet QSOs, PG 2302+029 and PG 1254+047. PG2302+029 has an ultra high-velocity UV absorption system (∼ −56, 000 km s), while PG 1254+047 is a Broad Absorption Line (BAL) QSO with detached troughs. Both objects are X-ray weak, consistent with the known correlation between αox and the strength of the UV absorption lines. The data suggest that there is ...

Using the Faint Object Spectrograph (FOS) aboard the Hubble Space Telescope, we have obtained the first time-resolved spectra of the King et al. ultraviolet-bright counterpart to the 11-minute binary X-ray source in the core of the globular cluster NGC6624. This object cannot be readily observed in the visible, even from HST, due to a much brighter star superposed < 0.1 distant. Our FOS data sh...

Recent observations of Broad Absorption Line (BAL) quasars demonstrated that the soft X-ray emission of these objects is extremely weak and convincing evidence for very strong absorption by a high column density (∼ 10 cm) was obtained for PG 1411+442, even though it is one of the few BAL QSOs strongly detected in soft X-rays. This paper examines the ionization status and geometry of the X-ray a...

Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission int...