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Reverberation Mapping of the Kepler-Field AGN KA1858+4850
Liuyi Pei, Aaron J. Barth, Greg S. Aldering +40
KA1858+4850 is a narrow-line Seyfert 1 galaxy at redshift 0.078 and is among the brightest active galaxies monitored by the Kepler mission. We have carried out a reverberation mapp…
Early and Extended Helium Reionization Over More Than 600 Million Years of Cosmic Time
Gábor Worseck, J. Xavier Prochaska, Joseph F. Hennawi +1
We measure the effective optical depth of HeII Lyα absorption τ at 2.3<z<3.5 in 17 UV-transmitting quasars observed with UV spectrographs on the Hubble Space Te…
A compact, metal-rich, kpc-scale outflow in FBQS J0209-0438: Detailed diagnostics from HST/COS extreme UV observations
Charles W. Finn, Simon L. Morris, Neil H. M. Crighton +6
We present HST/COS observations of highly ionized absorption lines associated with a radio-loud QSO at . The absorption system has multiple velocity components, tracing g…
The Giant Gemini GMOS survey of z>4.4 quasars - I. Measuring the mean free path across cosmic time
Gábor Worseck, J. Xavier Prochaska, John M. O'Meara +7
We have obtained spectra of 163 quasars at with the Gemini Multi Object Spectrometers on the Gemini North and South telescopes, the largest publicly available s…