Top Tweets for #GalacticFriday
Morning, space voyagers! Blast off into Friday with cosmic enthusiasm and stellar discoveries! ππ #GalacticFriday #SpaceTechThrill
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When a galaxy is not elliptical or spiral is called irregular. The name came from E. Hubble himself at the beginning of the XX century. Such galaxies have no a clear form in the bluest band of the optical spectrum.
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It is said that a galaxy is warped if its disk have a large-scale distortion, so it is not in a plane. It can be considered as a misalignment between the inner and the outer part of the disk.
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It is thought that some irregular galaxies might also have bars. However, due to their lack of form, they are much more difficult to detect. In order to decide if a bars is inside an irregular galaxy, kinematic studies should be performed because
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The most characteristic of the spiral galaxies are the spiral arms. They are concentrations of gas & stars which wrap around the center of the galaxy. If they are quite bended the galaxy is called "a early type", while if the arms are very open is correspond to
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Not all spiral galaxies have a prominent bulge. Only the so-called "early type", or Sa and Sb have it. They are not really round, some of them are quite boxy while some other have a leaf shape. Both have mainly old, small, reddish stars. Dynamically, they
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Spiral galaxies are, by far, the more complex galaxies because they have several components: a bulge at the center of the object, a thick disc of stars, a thin disc of gas, a stellar halo, a dark matter halo & sometimes a bar of stars going through the center.
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It might be thought that spiral galaxies, the most spectacular galaxies, are also the most common. But not!. In our neighbourhood, just three out of 40 galaxies are spirals. Only in large clusters spiral might be 30-40% of the total of galaxies there.
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Lenticular galaxies are bulge-dominated galaxies, with large bulge-to-disk ratios. This ratio measures the luminosity of the bulge compare to the luminosity of the disk for a galaxy and it is useful in the morphological classification scheme of galaxies.
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Are elliptical galaxies born in this form? we think not. Elliptical galaxies are formed due to the collision of two spiral galaxies of the same size. They keep growing with the addition of new small galaxies. This is called galactic cannibalims & it's the reason
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Elliptical galaxies are not forming many stars right now. The main reason is that the amount of gas they have is small compared to the amount of stars. But also, this gas is not very cold and it is very diffuse, with very small density. Therefore, new stars cannot
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The largest galaxies, called cD's, are normally at the center of the regular cluster of galaxies. They appears as a luminous center with a large, diffuse halo. This is probably the result of many mergers with small galaxies, which were incorporated to the galaxy.
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Spheroidal galaxies are called elliptical by E. Hubble because of their shape. They are some which are very round, like M87 in the picture. We say the ellipticity (the differences in size between the two axis) is zero and subclassified it as E0.
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Galaxies come in very differentes forms. The most interesting is that each of them have a very different structure as well as different components, some are almost absent in some of the galaxies. Also, their form might be related with their origin.
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Galaxies are fascinating objects. There are millions of stars inside them. But, the volumen is so large that most of a galaxy is empty! They are formed by massive stars (more massive we can conceive) but together they behaves as smooth as a fluid (water).
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Some of the low-metallicity galaxies has a lot of gas compared to stars. Then, maybe they have not formed all the stars they could and, therefore their low metal content. So, the next question is: why they did not formed so many stars?
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The Extreme Metal Poor galaxies are very important cause as the star formation proceed in a galaxy the metal content increases. Or, the more stars are formed along the life of the galaxy more chemical elements might be. Why these galaxies have so few of them?
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There is a group of galaxies which have a very low metallicity, more than 10 times lower than the metal content of the Sun. Such galaxies have been quite interesting because it was though they were formed very recently from the moment we see them.
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Galaxies are studied as "a gas of stars". But, stars are really big & galaxies are huge, how it can be? The volumen a star occupies is about 10^-32 the volumen of the galaxy.
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