ABSTRACT PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies
within∼ 20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other …

We present an updated and revised analysis of the relationship between the Hβ broad-line
region (BLR) radius and the luminosity of the active galactic nucleus (AGN). Specifically, we …

ABSTRACT SDSS J015957. 64+ 003310.5 is an X-ray selected, z= 0.31 active galactic
nucleus (AGN) from the Stripe 82X survey that transitioned from a Type 1 quasar to a Type …

We use a sample of 332 Hubble Space Telescope spectra of 184 quasi-stellar objects
(QSOs) with z> 0.33 to study the typical ultraviolet spectral properties of QSOs, with …

A class of extrasolar giant planets—the so-called 'hot Jupiters'(ref.)—orbit within 0.05 au of
their primary stars (1 au is the Sun–Earth distance). These planets should be hot and so emit …

We construct a composite quasar spectrum from 284 HST FOS spectra of 101 quasars with
redshifts z> 0.33. The spectrum covers the wavelengths between 350 and 3000 Å in the rest …

We present the first systematic study of (non-radio-selected) radio-loud narrow-line Seyfert 1
(NLS1) galaxies. Cross-correlation of the Catalogue of Quasars and Active Nuclei with …

We report the discovery of a new 'changing-look'quasar, SDSS J101152. 98+ 544206.4,
through repeat spectroscopy from the Time Domain Spectroscopic Survey. This is an …

The first half of this paper explores the origin of systematic biases in the measurement of
weak gravitational lensing. Compared to previous work, we expand the investigation of point …

Evidence for a Massive Black Hole in the Active Galaxy NGC 4261 from Hubble Spac ADS
Classic is now deprecated. It will be completely retired in October 2019. This page will …