Including a critical-density cut-off in the star formation law causes abundance gradients to be steepened.Analysis of gas flows within the models shows radial flows which are a function of angle of azimuth around the galaxies, with alternating inward and outward flows. This motion is linked to...
The most distant galaxies detected were seen when the Universe was a scant 5% of its current age. At these times, progenitors of galaxies such as the Milky Way were about 10,000 times less massive. Using the James Webb Space Telescope (JWST) combined with magnification from gravitational lensi...
If we want to find stars still in the process of formation, we must look in places that have plenty of the raw material from which stars are assembled. Since stars are made of gas, we focus our attention (and our telescopes) on the dense and cold clouds of gas and dust that dot the...
“There are black holes a little heavier than our sun that are like ants or spiders—they’re hard to spot, but kind of everywhere throughout the universe. Then you’ve got supermassive black holes that are like Godzilla in the centers of galaxies tearing things up, and we can see them...
allow forstar formationto occur at some gas particle, the particle is either reduced in mass or removed from the simulation with newly formed stellar particle(s) added to the simulation. The newly formed stellar particles inherit parameters of motion, metallicity, and others from their gas ...
With observations of the composition of the universe at very early times, for example, in very old stars, or the interstellar medium of galaxies at high redshift, the Big Bang and the cosmological environment of the first stars can be probed. Nucleosynthesis also affects the formation and ...
Massive stars (M > 8Mʘ) are rare and evolved rapidly but they play a crucial role in the chemical and dynamical evolution of galaxies. They produce a high amount of ultraviolet photons that can ionize the surrounding medium, especially neutral hydrogen (HI). This leads to the creation...
but it's only because your car has gone past it. This odd backward motion is called "retrograde motion." A planet can also have "retrograde rotation," which means it rotates in the opposite direction of its orbit. Most planets in our solar system have "prograde rotation," which means the...
The group calculated the mass of the stars in the survey by studying the energy they radiate. They compared that number with the mass obtained by measuring the motion of the stars, which is controlled by the galaxy's gravitational pull. [Photos: When Galaxies Collide] "We found that these ...
These atomically cooled, massive protogalaxies are expected ultimately to form a direct-collapse black hole of mass 104−105M⊙.This is a preview of subscription content, access via your institution Access optionsAccess through your institution ...