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Soft X-Ray and Ultraviolet Emission Relations in Optically Selected AGN Samples
Brandt, W. N.; Schneider, Donald P.; Vignali, Cristian +2 more
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 between rest-frame UV and soft X-ray emission and its evolution with cosmic time. The majority of the AGNs in our sample (155 objects) have been selected from the Sloan Digi…
The T Tauri Star Population of the Young Cluster NGC 2264
Simon, Theodore; Dahm, S. E.
An Hα emission survey of the young cluster NGC 2264 in the Mon OB1 association resulted in the detection of 490 Hα emission stars in a 25'×40' field approximately centered between the O7 V multiple star S Mon and the Cone Nebula. The survey was carried out with the wide-field grism spectrograph (WFGS) on the University of Haw…
The NGC 5846 Group: Dynamics and the Luminosity Function to MR=-12
Mahdavi, Andisheh; Tully, R. Brent; Trentham, Neil
We conduct a photometric and spectroscopic survey of a 10 deg2 region surrounding the nearby NGC 5846 group of galaxies, using the Canada-France-Hawaii and Keck I telescopes to study the population of dwarf galaxies as faint as MR=-10. Candidates are identified on the basis of quantitative surface brightness and qualitative m…
Optical Identification of Infrared Space Observatory Far-Infrared Sources in the Lockman Hole Using a Deep Very Large Array 1.4 GHz Continuum Survey
Veilleux, S.; Sanders, D. B.; Kawara, K. +10 more
By exploiting the far-infrared (FIR) and radio correlation, we have performed a likelihood-ratio analysis to identify optical counterparts to the FIR sources that have been found in an area of ~0.9 deg2 during the Infrared Space Observatory (ISO) deep FIR survey in the Lockman Hole. New ground-based observations have been conducted to b…
XMM-Newton Spectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755
Brandt, W. N.; Vignali, C.; Comastri, A. +4 more
We present the results from XMM-Newton observations of the highly optically polarized broad absorption line quasar (BALQSO) CSO 755. By analyzing its X-ray spectrum with a total of ~3000 photons, we find that this source has the X-ray continuum of a typical radio-quiet quasar, with a photon index of Γ=1.83+0.07-0.06 and a rat…