363 citations · 1.4k across the 20 of their papers we have counts for
8 papers · 1 filter
Soft X-ray and Ultraviolet Emission Relations in Optically Selected AGN Samples
Iskra Strateva, Niel Brandt, Donald Schneider +2
Using a sample of 228 optically selected Active Galactic Nuclei (AGNs) in the 0.01-6.3 redshift range with a high fraction of X-ray detections (81-86%), we study the relation betwe…
X-ray Survey Results on Active Galaxy Physics and Evolution
W. N. Brandt, D. M. Alexander, F. E. Bauer +1
This "pedagogical" review describes the key Chandra and XMM-Newton extragalactic surveys to date and details some of their implications for AGN physics and evolution. We additional…
The Chandra Deep Field North Survey. XII. The Link Between Faint X-ray and Radio Source Populations
F. E. Bauer, D. M. Alexander, W. N. Brandt +4
We investigate the relationship between faint X-ray and 1.4 GHz radio source populations detected within 3' of the Hubble Deep Field North using the 1 Ms Chandra and 40 uJy VLA sur…
The BeppoSAX High Energy Large Area Survey -V. The nature of the hard X-ray source populations and its evolution
F. La Franca, F. Fiore, C. Vignali +7
We present optical spectroscopic identifications of hard X-ray (5-10 keV) selected sources belonging to the HELLAS sample obtained with BeppoSAX down to a 5-10 keV flux limit of f_…
The Chandra Deep Field North Survey. X. X-ray Emission from Very Red Objects
D. M. Alexander, C. Vignali, F. E. Bauer +4
The multi-wavelength properties of Very Red Objects (VROs; I-K>=4) are largely unknown as many of these sources are optically faint (I>=24) and undetected at most wavelengths. Here…
The HELLAS2XMM survey: I. The X-ray data and the Log(N)-Log(S)
A. Baldi, S. Molendi, A. Comastri +3
We present the first results from an XMM-Newton serendipitous medium-deep survey, which covers nearly three square degrees. We detect a total of 1022, 495 and 100 sources, down to…
ASCA view on High-Redshift Radio-Quiet Quasars
C. Vignali, A. Comastri, M. Cappi +2
We briefly discuss the latest ASCA results on the X-ray spectral properties of high-redshift radio-quiet quasars.
On the nature of the X-ray absorption in the Seyfert 2 galaxy NGC 4507
A. Comastri, C. Vignali, M. Cappi +4
We present results of the ASCA observation of the Seyfert 2 galaxy NGC 4507. The 0.5-10 keV spectrum is rather complex and consists of several components: (1) a hard X-ray power la…