File:Single Arm Galaxy NGC 4618.tif
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[edit]DescriptionSingle Arm Galaxy NGC 4618.tif |
Русский: Галактика NGC 4618 была обнаружен 9 апреля 1787 года немецко-британским астрономом Вильгельмом Гершелем, который также открыл Уран в 1781 году. Всего за год до открытия NGC 4618 Гершель предположил, что «туманные» объекты, которые астрономы видели в ночном небе, вероятны были большими звёздными скоплениями, расположенными намного дальше, чем отдельные звезды, которые он мог легко различить.
С тех пор, как Гершель предложил свою теорию, астрономы поняли, что он видит галактику. NGC 4618, классифицированная как спиральная галактика с перемычками, отличается от других спиральных галактик тем, что имеет только одну руку (рукав), вращающуюся вокруг центра галактики. Расположенный примерно в 21 млн. Световых лет от нашей галактики в созвездии Гончих Псов, NGC 4618 имеет диаметр около трети диаметра Млечного пути. Вместе со своим соседом, NGC 4625, он образует взаимодействующую пару галактик, что означает, что две галактики достаточно близки, чтобы оказывать гравитационное влияние друг на друга. Эти взаимодействия могут привести к слиянию двух (или более) галактик, чтобы сформировать новое образование, такое как кольцевая галактика.English: NGC 4618 was discovered on 9 April 1787 by the German-British astronomer, Wilhelm Herschel, who also discovered Uranus in 1781. Only a year before discovering NGC 4618, Herschel theorised that the “foggy” objects astronomers were seeing in the night sky were likely to be large star clusters located much further away then the individual stars he could easily discern.
Since Herschel proposed his theory, astronomers have come to understand that what he was seeing was a galaxy. NGC 4618, classified as a barred spiral galaxy, has the special distinction amongst other spiral galaxies of only having one arm rotating around the centre of the galaxy. Located about 21 million light-years from our galaxy in the constellation Canes Venatici, NGC 4618 has a diameter of about one third that of the Milky Way. Together with its neighbour, NGC 4625, it forms an interacting galaxy pair, which means that the two galaxies are close enough to influence each other gravitationally. These interactions may result in the two (or more) galaxies merging together to form a new formation, such as a ring galaxy. |
Date | |
Source | https://www.spacetelescope.org/images/potw2012a/ |
Author | ESA/Hubble & NASA, I. Karachentsev |
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[edit]Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Width | 3,815 px |
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Height | 4,004 px |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Number of rows per strip | 22 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CC (Windows) |
File change date and time | 15:48, 19 September 2019 |
Color space | Uncalibrated |