News Saleb-,Newspapers are usually issued daily or weekly. Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper, Magazine News weekly, but they also had a magazine format. Newspapers with common interests usually publish news articles and articles about national and international news as well as local news. These include news events and personalities of the political, business and finance, crime, weather, and natural hazards; health and medicine, science, and computers and technology; Sports; and entertainment, community, food and cuisine, apparel and home fashion, and the arts.
A wide range of materials have been published in newspapers. In addition to news,Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper ,information and opinions expressed above, including weather forecasts; Criticism and reviews Arts (including literature, film, television, theater, art, and architecture) and local services such as a restaurant; obituaries, notices of birth and graduation announcements; Entertainment features such as crossword puzzles, horoscopes, editorial cartoons, jokes, cartoons and comics; Advice column, food, and other columns; and a list of radio and television (program schedule). In the year 2017, newspapers can also provide information about new movies and TV shows available on streaming video services such as Netflix. The newspaper has been classified ad section in which people and businesses can buy a small ad to sell goods or services; In the year 2013, a large increase in internet sites to sell goods, such as Craigslist and eBay have caused ad sales are much less classified for newspapers.Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper
Since 1983, it has been known mainly because of its annual report and rankings that influence in college and grad school, lies in most fields and subjects. U.s. News World Report is and academic institution is the oldest and most famous in America, [5] and covering the areas of business, law, medicine, engineering, social sciences, education and public affairs, in addition to many other areas. Print Edition] has consistently included in the list of national bestsellers, coupled with online subscriptions. Additional rankings published by U.s. News World Report and includes hospitals,Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper, medical and specialty cars.
Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper-News of the United States was founded in 1933 by David Lawrence (1888-1973), which also started the World Report in 1946. The two magazines are covering national and international news separately, but Lawrence combines them into news reports of U.S. in World and 1948 [1] and Later sold the magazine to its employees. Historically, this magazine tends to be a bit more conservative than the two main competitors, Time and Newsweek, and focus more on the story of economic, health, and education. It's also distancing news, entertainment and sports celebrities. [2] an important milestone in the history of the beginning of the magazine is including the introduction of the "Washington Whispers" column in 1934 and the column "News You Can Use" in 1952. [3] [4] in 1958, the circulation of the weekly magazine passed one million and two million in 1973. (wikipedia) Breaking News: Astronomers discover unusual spindle-like galaxies - News Paper
Galaxies are majestic, rotating wheels of stars? Not in the case of the spindle-like galaxies studied by Athanasia Tsatsi (Max Planck Institute for Astronomy) and her colleagues. Using the CALIFA survey, the astronomers found that these slender galaxies, which rotate along their longest axis, are much more common than previously thought. The new data allowed the astronomers to create a model for how these unusual galaxies probably formed, namely out of a special kind of merger of two spiral galaxies. The results have been published in the journal Astronomy & Astrophysics.
An elliptical galaxy in prolate rotation. The galaxy resembles the shape of a cigar, with its stars rotating around the galaxy's long axis, similar to a spindle. the background image is a snapshot of a simulation by A. Tsatsi and colleagues [Credit: J. Chang, PMO / T. Muller, HdA]
When most people think of galaxies, they think of majestic spiral galaxies like that of our home galaxy, the Milky Way: billions of stars, rotating in a flat disk similar to the way that a wheel rotates around its central axis. But there is another kind of galaxy, which used to be thought very rare: so-called prolate rotators, each shaped like a cigar, which rotates along its long axis, like a spindle.
Now, a group of astronomers led by Athanasia Tsatsi of the Max Planck Institute for Astronomy has completed a thorough study of these cosmic spindles. Using data from the CALIFA survey, a systematic study that examined the velocity structure of more than 600 galaxies, the astronomers discovered eight new prolate rotating galaxies, almost doubling the total known number of such galaxies (from 12 to 20). Cosmic spindles are considerably less rare than astronomers had thought!
Given the high quality of their data, the astronomers were able to propose a plausible explanation for how these cosmic spindles come into existence. In general, galaxies grow when they merge with other galaxies. Several mergers with smaller galaxies have made our own Milky Way the stately disk it is today. To make a cosmic spindle, two large disk galaxies need to collide at right angles, as shown in this animation:
As the galaxies begin to interact via gravitational attraction, one of them forms a bar: an elongated structure near the center. That bar becomes the cigar-like shape of the merged galaxy, while the orbiting stars of the other galaxy imbue the merged galaxy with its overall sense of rotation.
The results are an interesting piece of the puzzle, explaining a likely formation scenario for an unusual, but not all that uncommon type of galaxy. Tsatsi's team of researchers having put to good use all the information contained in the CALIFA data, the ball is now in the court of the observing astronomers again: the merger simulations make some additional predictions for the detailed properties of prolate rotators. These cannot be distinguished with the current observations, but could be tested with instruments like MUSE, the Multi Unit Spectral Explorer at ESO's Very Large Telescope, an 8-meter-telescope at Paranal Observatory in Chile.
0 komentar:
Post a Comment