Jonathan Stern

The first ultraviolet quasar-stacked spectrum at z ≃ 2.4 from WFC3

The ionising continuum from active galactic nuclei (AGN) is fundamental for interpreting their broad emission lines and understanding their impact on the surrounding gas. Furthermore, it provides hints on how matter accretes onto supermassive black holes. Using HSTs Wide Field Camera 3 we have constructed the first stacked ultraviolet (rest-frame wavelengths 600-2500\AA) spectrum of 53 luminous quasars at z=2.4, with a state-of-the-art correction for the intervening Lyman forest and Lyman continuum absorption. The continuum slope (

CONSTRAINING THE DYNAMICAL IMPORTANCE OF HOT GAS AND RADIATION PRESSURE IN QUASAR OUTFLOWS USING EMISSION LINE RATIOS

f_\nu \propto \nu^{\alpha_\nu}

Radiation pressure confinement – IV. Application to broad absorption line outflows

) of the full sample shows a break at ~912\AA\ with spectral index

EVIDENCE THAT MOST TYPE-1 AGNs ARE REDDENED BY DUST IN THE HOST ISM

\alpha_\nu=-0.61\pm0.01

Deconstructing the narrow-line region of the nearest obscured quasar

at

Spatially Resolving the Kinematics of the ≲ 100 μas Quasar Broad-line Region Using Spectroastrometry

\lambda>912

Small-scale Intensity Mapping: Extended Halos as a Probe of the Ionizing Escape Fraction and Faint Galaxy Populations during Reionization

\AA\ and a softening at shorter wavelengths (

Does Circumgalactic O vi Trace Low-pressure Gas Beyond the Accretion Shock? Clues from H i and Low-ion Absorption, Line Kinematics, and Dust Extinction

\alpha_\nu=-1.70 \pm 0.61

Type 1 low z AGN. I. Emission properties

at

A Universal Density Structure for Circumgalactic gas

\lambda\leq 912