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Landmark Achievement: 6 Astronomers from India Discover Giant Radio Galaxies (GRGs)

A team of 6 astronomers from India have reportedly discovered Giant Radio Galaxies (GRGs) which are the largest known galaxies in the universe

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Giant Radio Galaxies
Out of total known galaxies, only 300 have been classifies as Giant Radio Galaxies. Wikimedia
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  • Six astronomers from India have recently discovered the largest galaxies known to the universe, called Giant Radio Galaxies (GRGs)
  • Only 300 out of total number of galaxies are classified as Giang Radio Galaxies
  • The research was successful taking into account the research of last 6 decades of radio astronomy

July 06, 2017: A team of six astronomers from India has made a landmark discovery. Using the research from last six decades of radio astronomy and a 20-year-old survey, the team has detected the existence of Giant Radio Galaxies (GRGs).

Giant Radio Galaxies are known to be the largest galaxies in the universe. The reason for their large size is unknown as of now. As one of the lead researcher, Pratik Dabhade from Inter-University Centre for Astronomy and Astrophysics (IUCAA), explains in the study, “The huge size of GRGs has defied any theoretical explanation so far. Our work will help in understanding how these galaxies grow to be so large.”

The other researchers also involved include Joydeep Bagchi (IUCAA), Mamta Pommier (CNRS Observatoire de Lyon), Madhuri Gaikwad (Max Planck Institute Bonn), Shishir Sankhyayan (IISER Pune) and Somak Raychaudhary (IUCAA).

Also Read: “Do not Stand and Drink Water”: Here is Why it is often said so

Their research has been published in Journal Monthly Notices of the Royal Astronomical Society. The Giant Radio Galaxies are found co-existing with a supermassive black hole at the core of center of the nucleus. High energy particles are discharged at the speed of light which emerges into two giant radio lobes.

The Giant Radio Galaxies are known to be the last stage of evolution of galaxies, mainly because of their massive size. However, these galaxies are visible only through radio telescopes.

– by Saksham Narula of NewsGram. Twitter: @Saksham2394

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Habitability Of Surrounding Planets Affected By Super Flares Of Red Dwarfs: NASA

Red dwarfs -- especially young red dwarfs -- are active stars, producing flares blast out energy

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NASA, space, red dwarf
Superflares from red dwarfs may affect habitability of planets Pixabay

Using NASA’s Hubble Space Telescope, astronomers have found that violent outbursts, or superflares, from red dwarf stars could affect the habitability of any planets orbiting it.

Young low-mass stars flare much more frequently and more energetically than old stars and middle-age stars like our Sun, the findings of the study published in the Astrophysical Journal showed.

The findings are based on observations of the flare frequency of 12 red dwarfs.

Hubble is observing such stars through a large programme called HAZMAT — Habitable Zones and M dwarf Activity across Time.

“M dwarf” is the astronomical term for a red dwarf star — the smallest, most abundant and longest-living type of star in our galaxy.

Hubble Telescope. red dwarf
Hubble Telescope. Flickr

The HAZMAT programme is an ultraviolet survey of red dwarfs at three different ages — young, intermediate, and old.

“The goal of the HAZMAT programme is to help understand the habitability of planets around low-mass stars,” explained the programme’s principal investigator, Evgenya Shkolnik from Arizona State University.

“These low-mass stars are critically important in understanding planetary atmospheres,” Shkolnik added.

Stellar flares from red dwarfs are particularly bright in ultraviolet wavelengths, compared with Sun-like stars.

Red dwarf  planet
Artist’s view of planets transiting red dwarf star in TRAPPIST-1 system. Flickr

Hubble’s ultraviolet sensitivity makes the telescope very valuable for observing these flares.

The flares are believed to be powered by intense magnetic fields that get tangled by the roiling motions of the stellar atmosphere.

When the tangling gets too intense, the fields break and reconnect, unleashing tremendous amounts of energy.

The team found that the flares from the youngest red dwarfs they surveyed — just about 40 million years old — are 100 to 1,000 times more energetic than when the stars are older.

This younger age is when terrestrial planets are forming around their stars.

Red dwarf
This illustration shows a red dwarf star orbited by a hypothetical exoplanet. NASA

About three-quarters of the stars in our Milky Way galaxy are red dwarfs. Most of the galaxy’s “habitable-zone” planets — planets orbiting their stars at a distance where temperatures are moderate enough for liquid water to exist on their surface — orbit red dwarfs.

In fact, the nearest star to our Sun, a red dwarf named Proxima Centauri, has an Earth-size planet in its habitable zone.

Also Read: NASA Plans For Science Payloads For Delivery To Moon

However, red dwarfs — especially young red dwarfs — are active stars, producing flares that could blast out so much energy that it disrupts and possibly strips off the atmospheres of these fledgling planets. (IANS)