Explanation: How much mass do flocculent spirals hide? The featured true color image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. The featured image was augmented with data from the Sloan Digital Sky Survey (SDSS). Flocculent spirals -- galaxies without well-defined spiral arms -- are a quite common form of galaxy, and NGC 4414 is one of the closest. Stars and gas near the visible edge of spiral galaxies orbit the center so fast that the gravity from a large amount of unseen dark matter must be present to hold them together. Understanding the matter and dark matter distribution of NGC 4414 helps humanity calibrate the rest of the galaxy and, by deduction, flocculent spirals in general. Further, calibrating the distance to NGC 4414 helps humanity calibrate the cosmological distance scale of the entire visible universe.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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Publikacii s klyuchevymi slovami: spiral galaxy - NGC 4414 - spiral'naya galaktika Publikacii so slovami: spiral galaxy - NGC 4414 - spiral'naya galaktika
Sm. takzhe: Spiral'naya galaktika s peremychkoi NGC 1365 ot teleskopa "Dzheims Vebb" Spiral'naya galaktika NGC 6744 M106: spiral'naya galaktika so strannym yadrom NGC 247 s druz'yami Licom k NGC 6946 M83: zvezdnye potoki i tysyacha rubinov NGC 1546 ot teleskopa im.Habbla Vse publikacii na tu zhe temu >>