Quasar Archives

Normalized flux versus velocity for blue-shifted absorption lines detected in the spectrum of 3C298. The horizontal green dashed horizontal line shows the continuum level, and the vertical black dashed lines show the integration region for each line. -- astro-ph.GA

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Interstellar, Status Report

Determining The Absolute Chemical Abundance of Nitrogen and Sulfur in the Quasar Outflow of 3C298

by Keith CowingNovember 24, 2024

Context. Quasar outflows are key players in the feedback processes that influence the evolution of galaxies and the intergalactic medium. The chemical abundance of these outflows provides crucial insights into […]

Microlensing magnification, in magnitudes, as a function of the source position for the positive parity image A. The right column assumes that all mass is in stellar-mass objects while the left includes a contribution from planetary-mass (nano-) lenses. The top row is for a point (or, more precisely, pixel-sized) source while the maps in the middle are convolved with a Gaussian disc of half-light radius 𝑅𝑠 = 3 × 1015 cm.-- astro-ph.CO

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Free-floating “Planets” In The Macrolensed Quasar Q2237+0305

by Keith CowingJanuary 12, 2024January 12, 2024

It has been claimed that the variability of field quasars resembles gravitational lensing by a large cosmological population of free-floating planets with mass of about 10 Earths.