منابع مشابه
How Do Galaxies Form?
It is currently believed that galaxies were assembled via chaotic hierarchical mergers between massive cold dark matter halos, in which baryonic star forming matter was embedded. One would therefore expect the properties of individual galaxies to be determined by numerous independent factors such as star forming history, merger history, mass, angular momentum, size and environment. It is theref...
متن کاملHow Galaxies Don't Form
I review current theories of disk galaxy formation. All fail in the light of recent data for low surface brightness galaxies. The difficulty stems from the presence of a unique acceleration scale in the data. All we know so far is what doesn't work.
متن کاملHow Protostellar Outflows Help Massive Stars Form
We consider the effects of an outflow on radiation escaping from the infalling envelope around a massive protostar. Using numerical radiative transfer calculations, we show that outflows with properties comparable to those observed around massive stars lead to significant anisotropy in the stellar radiation field, which greatly reduces the radiation pressure experienced by gas in the infalling ...
متن کاملFORMATION of GALAXIES and STARS
In the article some features of formation of galaxies and stars are considered Apparently, that star-formation happens simultaneously to formation of galaxies from those rotated with miscellaneous velocity and clouds of matter, possessing by own peculiar velocities, which one are thrown out at decay of supernuclei. "As to age, we have continuous sequence: star-formation was prolonged in all tim...
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The light curves of Cepheids and other variable stars in Field A of IC 1613, obtained with a CCD and no filter (Wh photometry), have been analyzed. It is possible to separate first overtone from fundamental mode population I Cepheids taking into account the pulsation amplitude, the shape of the light curve and the period. The expected separation is verified in the period–luminosity PL diagram. ...
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ژورنال
عنوان ژورنال: Nature
سال: 2014
ISSN: 0028-0836,1476-4687
DOI: 10.1038/514310a