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NASA’s Hubble discovers galaxy star birth mechanism

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Washington: Astronomers have uncovered a unique process for how the universe’s largest galaxies continue to producing stars long after their peak years of star birth.

NASA’s Hubble Space Telescope allowed the astronomers to see brilliant knots of hot, blue stars forming along the jets of active black holes found in the centres of giant elliptical galaxies.

Combining Hubble data with observations from a suite of ground-based and space telescopes, two independent teams found that that the black hole, jets, and newborn stars are all parts of a self-regulating cycle.

High-energy jets shooting from the black hole heat a halo of surrounding gas, controlling the rate at which the gas cools and falls into the galaxy.

“Think of the gas surrounding a galaxy as an atmosphere. That atmosphere can contain material in different states, just like our own atmosphere has gas, clouds, and rain,” said Megan Donahue from the Michigan State University.

What we are seeing is a process like a thunderstorm.

“As the jets propel gas outward from the centre of the galaxy, some of that gas cools and precipitates into cold clumps that fall back toward the galaxy’s centre like raindrops,” Donahue added.

The “raindrops” eventually cool enough to become star-forming clouds of cold molecular gas.

“We know that these showers are linked to the jets because they’re found in filaments and tendrils that wrap around the jets or hug the edges of giant bubbles that the jets have inflated,” said Grant Tremblay from Yale University.

This discovery explains the mystery of why many elliptical galaxies in the present-day universe are not ablaze with a higher rate of star birth.

An earlier independent study, led by Rupal Mittal of the Rochester Institute of Technology and the Max Planck Institute for Gravitational Physics, also analysed the star-birth rates in the same galaxies as Tremblay’s sample.

The two papers was published in the Astrophysical Journal and the Monthly Notices of the Royal Astronomical Society.

Business

Apple is giving a huge discount on its gadgets: Details inside

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If you want to buy an iPhone and were waiting for a nice offer, then we have a piece of good news for you! Amazon Summer Sale May 2022 has begun and they are offering major discounts on various smartphones, laptops, and smart TVs, among others.

The sale is live now on the e-commerce platform with no-cost EMI options and exchange discounts on various products. In addition to this, Amazon has also partnered with several banks including ICICI, Kotak Bank, and RBL so that customers get instant discounts of up to 10% using their cards and EMI transactions.

Customers can easily enjoy this summer sale and get massive discounts on iPhones. They can also compare prices on Flipkart Big Saving Days Sale 2022 before making a purchase.

 

Amazon Summer Sale May 2022: Discount offer on iPhone 13 

Apple’s coveted phone model iPhone 13 in the 128 GB storage model will be available during the Amazon Summer Sale May 2022 for Rs 64,900. The MRP of the phone is Rs 79,900. This means that the customers will be able to enjoy a discount of up to Rs 15,000 on the purchase of the iPhone 13.

If you have an old iPhone in working condition then you will also be eligible to receive another additional discount worth up to Rs 17,000 on the iPhone 13.

Buy at Rs. 64,900 (MRP – Rs. 79,900)

Features of Apple iPhone 13 

The iPhone is powered by an A15 Bionic processor with 6 core CPU. Apart from this, it has 16 core neural engines. With the iPhone 13, up to 512 GB of storage will be available. The iPhone 13 has a 6.1-inch Retina XDR display with 1000 nits brightness.

The iPhone 13 has a 12-megapixel dual rear camera setup. This time a new wide-angle camera has been given, whose aperture is f/1.6. With this, there is support for sensor optical stabilisation. Night mode has been made better than before. The second lens is also 12 megapixels ultra-wide and has an aperture of f/2.4.

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