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Scientists discover a Fossil Relic of early Milky Way harboring stars of hugely different ages

These similarities could make Terzan 5 a fossilised relic of galaxy formation, representing one of the earliest building blocks of the Milky Way

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Milky Way Galaxy. Image Source: Wikimedia Commons.
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LONDON, Sept 08, 2016: An international team of researchers has found that a stellar system classified as a globular cluster for the 40-odd years since its detection actually has properties uncommon for a globular cluster that make it the ideal candidate for a living fossil from the early days of the Milky Way.

The cluster, known as Terzan 5 — 19,000 light-years from Earth- harbours stars of hugely different ages — an age-gap of roughly seven billion years and bridges the gap in understanding between our galaxy’s past and its present, the study said.

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“Such galactic fossils allow astronomers to reconstruct an important piece of the history of our Milky Way,” explained lead author of the study Francesco Ferraro from University of Bologna in Italy.

While the properties of Terzan 5 are uncommon for a globular cluster, they are very similar to the stellar population which can be found in the galactic bulge, the tightly packed central region of the Milky Way.

These similarities could make Terzan 5 a fossilised relic of galaxy formation, representing one of the earliest building blocks of the Milky Way.

“Terzan 5 could represent an intriguing link between the local and the distant Universe, a surviving witness of the Galactic bulge assembly process,” Ferraro said.

The team scoured data from the Advanced Camera for Surveys and the Wide Field Camera 3 on board Hubble, as well as from a suite of other ground-based telescopes.

They found compelling evidence that there are two distinct kinds of stars in Terzan 5 which not only differ in the elements they contain, but have an age-gap of roughly seven billion years.

The ages of the two populations indicate that the star formation process in Terzan 5 was not continuous, but was dominated by two distinct bursts of star formation.

“This requires the Terzan 5 ancestor to have large amounts of gas for a second generation of stars and to be quite massive. At least 100 million times the mass of the Sun,” co-author of the study Davide Massari from National Institute for Astrophysics (INAF) , Italy.

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Its unusual properties make Terzan 5 the ideal candidate for a living fossil from the early days of the Milky Way, said the study published in the Astrophysical Journal.

Somehow Terzan 5 has managed to survive being disrupted for billions of years, and has been preserved as a remnant of the distant past of the Milky Way.

The researchers believe that this discovery paves the way for a better and more complete understanding of galaxy assembly. (IANS)

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Manoj Bajpayee is an amazing actor and a team player on set: Sidharth Malhotra

Sidharth Malhotra on Thursday treated his fans to a question and answer session over Twitter.

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Actor Sidharth Malhotra
Actor Sidharth Malhotra. Wikimedia Commons

November 7, 2017: Actor Sidharth Malhotra, who will be seen sharing screen space with Manoj Bajpayee in “Aiyaary”, says the National Award winning actor is amazing and a team player.

Sidharth Malhotra on Thursday treated his fans to a question and answer session over Twitter.

A user asked the “Student Of The Year” actor about his experience working with Manoj in “Aiyaary”.

Sidharth replied: “He’s an amazing actor and a team player on set.”

“Aiyaary”, set in Delhi, London and Kashmir, revolves around two strong-minded Army officers having completely different views, yet right in their own ways. It is a real-life story based on the relationship between a mentor and a protege.

Presented by Plan C and Jayantilal Gada (Pen), the project is produced by Shital Bhatia, Dhaval Jayantilal Gada, Motion Picture Capital.

When asked about the development of the film, Sidharth replied: “Awesome. Excited to show it in a few months.”

Sidharth, 32, also described his “Brothers” co-star Akshay Kumar as his “brother from another mother.”(IANS)