Add to ORKGRecent ROSAT studies have identified a significant population of Active Galactic Nuclei (AGN) that are notably faint in soft X-rays relative to their optical fluxes. Are these AGN intrinsically X-ray weak or are they just highly absorbed? Brandt, Laor & Wills have systematically examined the optical and UV spectral properties of a well-defined sample of these soft X-ray weak (SXW) AGN drawn from the Boroson & Green sample of all the Palomar Green AGN with z<0.5. We present ASCA observations of three of these SXW AGN: PG 1011-040, PG 1535+547 (Mrk 486), and PG 2112+059. In general, our ASCA observations support the intrinsic absorption scenario for explaining soft X-ray weakness; both PG 1535+547 and PG 2112+059 show significant column densi...
We have surveyed the optical linear polarimetric properties of 65 soft X-ray selected ROSAT Active G...
The narrow line QSO PG1211+143 has been a focus of recent attempts to understand the soft excess in ...
The origin of the soft excess seen in many active galactic nuclei (AGN) below ~1 keV is still an uns...
Active galactic nuclei (AGN) show evidence for reprocessing gas, outflowing from the accreting black...
Recent studies of QSOs with ROSAT suggest the existence of a significant population of Soft X-ray We...
We review some of the main physical and statistical properties of the X-ray absorber in AGNs. In par...
This is the second paper of our investigation of the 0.5-2 keV soft X-ray luminosity function (SXLF)...
We present \textit{Chandra} observations of the radio-quiet Broad Absorption Line (BAL) QSO PG 1254+...
Recent results from the ROSAT All Sky Survey, and from deep ROSAT pointings reveal that broad absorp...
We investigate the nature of the soft excess below 1keV observed in AGN. We use the XMM-Newton data ...
We present the results of ROSAT PSPC observations of three active galactic nuclei (AGN) with extreme...
As a part of this program, we observed three AGN:PKS2251 + 113, PG0043 = 039 and PLH909. Two objects...
We present here the analysis of ultraviolet spectra from IUE and an X-ray spectrum from ROSAT PSPC o...
We present an analysis of the \rosat and \asca spectra of 21 broad line AGN (QSOs) with $z\sim 1$ de...
(I) We observed eight Seyfert~2s and two X--ray--weak Seyfert~1/QSOs with the ROSAT PSPC, and one Se...
We have surveyed the optical linear polarimetric properties of 65 soft X-ray selected ROSAT Active G...
The narrow line QSO PG1211+143 has been a focus of recent attempts to understand the soft excess in ...
The origin of the soft excess seen in many active galactic nuclei (AGN) below ~1 keV is still an uns...
Active galactic nuclei (AGN) show evidence for reprocessing gas, outflowing from the accreting black...
Recent studies of QSOs with ROSAT suggest the existence of a significant population of Soft X-ray We...
We review some of the main physical and statistical properties of the X-ray absorber in AGNs. In par...
This is the second paper of our investigation of the 0.5-2 keV soft X-ray luminosity function (SXLF)...
We present \textit{Chandra} observations of the radio-quiet Broad Absorption Line (BAL) QSO PG 1254+...
Recent results from the ROSAT All Sky Survey, and from deep ROSAT pointings reveal that broad absorp...
We investigate the nature of the soft excess below 1keV observed in AGN. We use the XMM-Newton data ...
We present the results of ROSAT PSPC observations of three active galactic nuclei (AGN) with extreme...
As a part of this program, we observed three AGN:PKS2251 + 113, PG0043 = 039 and PLH909. Two objects...
We present here the analysis of ultraviolet spectra from IUE and an X-ray spectrum from ROSAT PSPC o...
We present an analysis of the \rosat and \asca spectra of 21 broad line AGN (QSOs) with $z\sim 1$ de...
(I) We observed eight Seyfert~2s and two X--ray--weak Seyfert~1/QSOs with the ROSAT PSPC, and one Se...
We have surveyed the optical linear polarimetric properties of 65 soft X-ray selected ROSAT Active G...
The narrow line QSO PG1211+143 has been a focus of recent attempts to understand the soft excess in ...
The origin of the soft excess seen in many active galactic nuclei (AGN) below ~1 keV is still an uns...