The astronomers initially selected this galaxy to validate accepted models about lower-luminosity active galaxies
-- those with black holes that are on a meager diet of material.
The time in Texas indeed shaped much of Tony's later research career; his interest in active galaxies
and supernovae (valuable for measuring the scale of the universe) were strengthened from the time spent in California with Fritz Zwicky, whom Tony held in the highest regard.
Aimed at astronomy and physics majors, it offers thorough coverage of galactic structure and evolution, active galaxies
, cosmology, and the history of the universe.
Activities include: (1) Building Perspectives with Active Galaxies
; (2) Zooming In on Active Galaxies
; and (3) Light Travel Time and the Size of Active Galaxies
During the first five years - its original lifespan was only meant to be three to five years - cosmonauts and scientists pushed back the limits of knowledge on the physics of active galaxies
, quasars and neutron stars, and acquired a wealth of information about living for long periods in space.
are a special class of galaxies: 1-2% of the whole population of galaxies, which shine with more energy than their stars alone can provide.
This was the first case of what came to be called active galaxies
, those with centers that seem to be the site of activity beyond the normal.
While such winds are now found in many active galaxies
, PG1211+143 has now yielded another 'first', with the detection of matter plunging directly into the hole itself."
Same is the job of their elder siblings that are much bigger in size and are found at the heart of active galaxies
Special types of distant active galaxies
and their innermost central regions show extreme physical processes.
Using data from NASA's Rossi X-ray Timing Explorer (RXTE) satellite, an international team has uncovered a dozen instances where X-ray signals from active galaxies
dimmed as a result of a cloud of gas moving across our line of sight.