$QSAR quasar

Latest papers

1. specwizard: A Public Python Framework for Creating Synthetic Absorption Spectra from Hydrodynamical Simulations astro-ph.CO · 14 Oct · 2 hits

   …offers optional treatments of instrumental resolution and noise for direct comparison with high-resolution quasar spectra. As example applications of the code, we shoot sightlines through the eagle cosmological…

2. A heterogeneous set of unusual quasars selected from astrometry and broad-band photometry astro-ph.GA · 14 Oct · 8 hits

   The aim of this study is to explore methods for how to identify new quasars with different properties with regard to reddening, redshift, the presence of broad absorption lines…

3. Microcaustics: Fast GPU-Accelerated Dynamical Microlensing of Time-Dependent Extended Sources astro-ph.GA · 14 Oct · 3 hits

   Gravitational microlensing probes unresolved quasar accretion disc structure and compact objects in lens galaxies and is an important systematic in…

4. Deep X-ray View of a Distant Protocluster Anchored by a Quasar at $z=6.63$: No Evidence for Enhanced X-ray AGN Activity astro-ph.GA · 13 Oct · 3 hits

   …constraints on $z>6$ protoclusters are rare. We analyze $\sim865$ ks of Chandra observations of J0910-0414 quasar field, a massive protocluster at $z=6.63$. We construct a catalog of 251 X-ray sources and search for…

5. Are Broad Mg II Galaxies Fading AGN? astro-ph.GA · 13 Oct · 1 hit

   …weaker AGN luminosities and lower accretion rates (parameterized by the Eddington ratio) than typical Type 1 quasars from SDSS. The Eddington ratio of broad Mg II galaxies are similar to dim-state changing-look AGN,…

6. Scalar-Assisted Growth of Supermassive Black Holes: Boson-Mass Windows and Observational Constraints astro-ph.CO · 13 Oct · 1 hit

   …M_{\rm BH}$ and therefore shifts approximately as $\mu\propto M_{\rm BH}^{-1}$. Comparison with observed quasar masses and luminosities instead favors lower boson masses, broadly around…

7. The Second Catalog of Low-Energy Fermi-LAT Sources astro-ph.HE · 13 Oct · 1 hit

   …with extragalactic sources, the dominant source class represented in the 2FLE are flat-spectrum radio quasars (FSRQ). Additionally, 52 sources are associated with Galactic sources. Three associated sources have…

8. Nearly pristine gas in a galaxy 1 billion years after the Big Bang astro-ph.GA · 12 Oct · 1 hit

   …for ultra-metal-poor galaxies using their spectroscopic absorption signatures in front of bright background quasars, employing the new GHOST high-resolution spectrograph. Here we report the discovery of the first…