Astronomers capture most distant star ever seen
Washington: American astronomers have captured the most distant normal star ever observed, some 9 billion light years from Earth, thanks to a rare cosmic alignment.
The study, published on Monday online in the journal Nature Astronomy, revealed the discovery of a star called Icarus, magnified by gravitational lensing by over 2,000 times, reported Xinhua.
Astronomers routinely study galaxies much farther away, visible because they glow with the brightness of billions of stars. They also managed to study supernova, often brighter than the galaxy in which it sits.
However, for a distance of about 100 million light years, the stars in these galaxies are impossible to make out individually.
But a phenomenon called gravitational lensing, the bending of light by massive galaxy clusters in the line of sight, can magnify the distant universe and make dim, far away objects visible.
The single star was discovered in NASA Hubble Space Telescope images taken in late April of 2016 and as recently as April 2017.
"You can see individual galaxies out there, but this star is at least 100 times farther away than the next individual star we can study, except for supernova explosions," said Patrick Kelly at the University of Minnesota, Twin Cities, the paper's first author.
These observations can provide a rare look at how stars evolve, especially the most luminous ones.
"For the first time ever we're seeing an individual normal star - not a supernova, not a gamma ray burst, but a single stable star - at a distance of nine billion light years," said Alex Filippenko, a professor of astronomy at UC Berkeley and one of many co-authors of the report.
The B-type star Icarus is much larger, more massive, hotter and possibly hundreds of thousands of times intrinsically brighter than our Sun.
According to the researchers, an extended lens, like a galaxy cluster, can only magnify a background object up to 50 times, but smaller objects can magnify much more.
A single star in a foreground lens, if precisely aligned with a background star, can magnify the background star thousands of times.
In this case, a star about the size of our sun briefly passed directly through the line of sight between the distant star Icarus and Hubble, boosting its brightness significantly.
Also, if the alignment was perfect, that single star within the cluster turned the light from the distant star into an "Einstein ring": a halo of light created when light from the distant star bends around all sides of the lensing star.
The ring is too small to discern from this distance, but the effect made the star easily visible by magnifying its apparent brightness.
The astronomers predict that Icarus will be magnified many times over the next decade as cluster stars move around, perhaps increasing its brightness as much as 10,000 times.
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Allahabad HC orders police protection to married couple apprehending 'honour killing'
Prayagraj (PTI): The Allahabad High Court has granted protection to a married couple who expressed fear that they may be killed by the woman's family.
The order was passed by a division bench comprising Justice JJ Munir and Justice Tarun Saxena on March 25.
"No individual can make an 'honour issue' out of a consenting adult marrying a person of their own choice. It is the state's duty to protect the life, limb, and property of such persons even against their own family members," the bench said.
The court was hearing a petition filed by Prachi Agrawal and her partner, who sought relief in connection with an FIR filed under Section 87 of Bhartiya Nyaya Sanhita (BNS) for kidnapping, and abducting or inducing a woman to compel her marriage.
The couple submitted that they married at an Arya Samaj temple and possessed a marriage registration certificate issued under the Uttar Pradesh Marriage Registration Rules, 2017.
The petitioners alleged that the woman's family members were averse to their marriage and lodged a bogus FIR against them.
The couple further submitted a joint affidavit expressing apprehension of an honour killing by the woman's family.
The court said that a prima facie case was made out and issued notice to the private respondent and granted two weeks to file a counter-affidavit.
Meanwhile, as an interim measure, the court granted the petitioners protection from arrest.
The court also explicitly ordered the woman's family members and relatives not to harm the petitioners, enter their matrimonial home, or establish contact with them directly or through any electronic means.
The bench directed the Aligarh senior superintendent of police to ensure that no harm comes to the couple and posted the matter for hearing on April 8.
