Our empirical understanding of galaxy formation and evolution rests on a combination of observations of the stellar populations in the nearest galaxies, direct observations of galaxies at cosmological lookback times, and integrated measurements of galaxies at the present epoch. This review describes ...
The Birth of Stars and Planets 2024 pdf epub mobi 电子书 图书描述 Star formation is the fundamental cosmic process which makes galaxies visible, and regulates the evolution of normal matter in the Universe. New instruments and technologies are now enabling the exploration of fundamental cosmic ...
including planet formation and the formation of galaxies, and opens up a new perspective on the chronology of star formation. For example, the length of the so-called “embedded phase”, during which baby stars remain within the parental gas cloud, can be estimated,” explains ...
Stars are formed innebulae, interstellar clouds of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies. An accretion disk In these stellar nurseries, dense parts of these clouds undergogravitational collapseand compress to form a rotating gas globule....
Astronomers found that active star formation upswells galaxies, like yeast helps bread rise. Using three powerful telescopes on the ground and in orbit, they observed galaxies from 11 billion years ago and found explosive formation of stars in the cores
Star formation in galaxies is a tug-of-war between opposing forces. Clouds of gas collapse, feeding fledgling stars. These can, in turn, prevent new stars from forming by blowing away the nurturing gas with their stellar winds. Star clusters are thus expected to lie at the centre of gas ...
NGC 253, reveals violent star formation within a region 1,000 light-years across.Hubble's sharp vision allows astronomers to see complex structures in the starburst core for the first time, including luminous star clusters, filaments of glowing gas, and dust lanes that trace regions of dense ga...
Such seed BHscould have formed from the death of thefirst generation of (population Ⅲ) stars,from direct collapse of pristine gas, or frommergers in dense stellar clusters. Detectingthese early seeds is extremely challengingwith current instrumentation; however,those that did not become supermassive...
The possibility that the far-UV flux in elliptical galaxies originates from post-asymptotic giant branch stars is examined in the frame of the theory of st... G Barbaro,FM Olivi - 《Astrophysical Journal》 被引量: 28发表: 1989年 Stellar X‐ray surveys and Galaxy structure Soft X-ray surve...
Formation of dwarf galaxies in tidal tails ZWICKY 1 argued long ago that tidal forces can tear long tails of stars and gas from the bodies of interacting disk galaxies and that this debris may incl... JE Barnes,L Hernquist - 《Nature》 被引量: 347发表: 1992年 Tidal dwarf galaxies as a...