Bangladeshi scientist Rubab Khan has made a major breakthrough in astronomy.
Khan, of Nasa’s Goddard Space Flight Centre, and his team has discovered five supersize stars “Eta twins” in other galaxies on par with a monstrous stellar system in our own Milky Way.
During the annual meeting of the American Astronomical Society in the USA this year, Rubab placed his findings on the discovery of five “Eta twins”. They were identified with the help of the Hubble Space Telescope and Nasa’s Spitzer Space Telescope.
Working with Scott Adams and Christopher Kochanek at Ohio State and George Sonneborn at Goddard, Rubab developed a kind of optical and infrared fingerprint for identifying possible Eta twins. According to Nasa, Rubab and his team surveyed seven galaxies from 2012 to 2014 to look for Eta twins.
The team found two candidates in the galaxy M83, located 15 million light years away, and one each in NGC 6946, M101 and M51, located between 18 and 26 million light years away. These five objects mimic the optical and infrared properties of Eta Carinae, indicating that each very likely contains a high mass star buried in five to 10 solar masses of gas and dust.
(Top) Hubble view of M83 — the galaxy that possibly hosts two potential “Eta twins”. Its high rate of star formation increases the chances of finding massive stars that have recently undergone an Eta Carinae-like eruption. (Bottom) Hubble data showing the locations of M83’s Eta twins. Photo: Nasa
Further study will let astronomers determine more precisely their physical properties. The findings were published in the December 20 edition of The Astrophysical Journal Letters.
Gravitational waves: Selim Shahriar
US-based Bangladeshi Professor Selim Shariar discovered gravitational waves – which now confirm Albert Einstein’s famous theory of relativity.
Selim Shahriar. Photo: Collected
A team of scientists at Northwestern University led by Shahriar confirmed the existence of gravitational waves created by the collision of two black holes in the universe. This collision took place 1.3 billion light years away from earth. (A light year is the distance that a ray of light travels in a vacuum in 1 year, equivalent to 5.88 trillion miles or 9.46 trillion kilometres).
Shahriar, who had been working to “improve the sensitivity of LIGO detectors and broaden the spectrum” for the last ten years, placed two L-shaped antennae on opposite sides of the US – one in Washington State in west USA and the other in the eastern sea board. And then, on the same day, he noticed a small blip lasting for 0.2 seconds, which was 1000 times smaller than a proton. Such blips gave extensive information to scientists about the birth and nature of the universe. It also confirmed Albert Einstein’s idea of gravitational wave in the universe.
Gravitational waves and ripples in space: Dipankar Talukdar
Scientist Dipanker Talukdar brought fame to Bangladesh detected gravitational waves came from the merging of two distant black holes. Photo: Collected
The 39-year-old former student of Physics Department of Dhaka University along with his team used a pair of giant laser detectors in the US. One of these detectors was in Lousiana and the other in Washington. The Laser Interferometer Gravitational Wave Observatory (LIGO) received a wave signal about which scientists came to know. They found that the waves were the product of a collision between two black holes 30 times more massive than our sun and located about 1.3 billion light years from earth.
Nano-scale electronic and spintronic devices: Sayeef Salahuddin
Bangladeshi scientist Sayeef Salahuddin developed nanoscale electronic and spintronic devices for low power logic and memory applications.