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Indian astronomers discover a supercluster of galaxies, name it Saraswati

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Indian astronomers discover a supercluster of galaxies, name it SaraswatiIndian astronomers discover a supercluster of galaxies, name it Saraswati

[vc_row][vc_column][vc_column_text]A team of Indian astronomers have identified an extremely large supercluster of galaxies and have named it Saraswati.

This previously unknown, extremely large supercluster of galaxies, was discovered by a team of astronomers from the Inter University Centre for Astronomy & Astrophysics (IUCAA), and Indian Institute of Science Education and Research (IISER), both in Pune, India, and members of two other Indian universities. The team was led by Joydeep Bagchi from IUCAA, while others included Shishir Sankhyayan, a PhD student at IISER, Pratik Dabhade, an IUCAA research fellow, Joe Jacob of the Newman College, Kerala, and Prakash Sarkar of the National Institute of Technology, Jamshedpur.

The discovery comes close on the heels of another, reported on July 1, of “a large sample of giant radio galaxies” by the same institution. A six-member team of Indian astronomers led by Pratik Dabhade from IUCAA had reported the discovery of 25 extremely rare kind of galaxies called giant radio galaxies (GRGs), known to be the largest known galaxies in the universe. Bagchi was also part of the team.

Saraswati supercluster, located in the direction of constellation Pisces, is one of the largest known structures in the nearby Universe, and is at a distance of 4,000 million (400 crore) light-years away from us. Our own galaxy is part of a Supercluster called the Laniakea Supercluster, announced in 2014 by Brent Tully at the University of Hawaii and collaborators.

Superclusters are the largest coherent structures in the Cosmic Web. A Supercluster is a chain of galaxies and galaxy clusters, bound by gravity, often stretching to several hundred times the size of clusters of galaxies, consisting of tens of thousands of galaxies. The newly discovered ‘Saraswati’ supercluster, for instance, extends over a scale of 600 million light-years and may contain the mass equivalent of over 20 million billion suns. \

The Saraswati supercluster has a total of 43 clusters of galaxies. The typical size of a galaxy here is around 250,000 light years.

Two most massive clusters of galaxies in the Saraswati supercluster : “ABELL 2631” cluster (left) and “ZwCl 2341.1+0000” cluster (right). “ABELL 2631” resides in the core of the Saraswatisupercluster. The Saraswati supercluster has a total of 43 clusters of galaxies.

Two most massive clusters of galaxies in the Saraswati supercluster : “ABELL 2631” cluster (left) and “ZwCl 2341.1+0000” cluster (right). “ABELL 2631” resides in the core of the Saraswatisupercluster. The Saraswati supercluster has a total of 43 clusters of galaxies.

In a press statement, Joydeep Bagchi from IUCAA, the lead author of the paper and co-author Shishir Sankhyayan (PhD scholar at IISER, Pune) said, “We were very surprised to spot this giant wall-like supercluster of galaxies, visible in a large spectroscopic survey of distant galaxies, known as the Sloan Digital Sky Survey (see figure above). This supercluster is clearly embedded in a large network of cosmic filaments traced by clusters and large voids.”

Previously only a few comparatively large superclusters have been reported, for example the ‘Shapley Concentration’ or the ‘Sloan Great Wall’ in the nearby universe, while the ‘Saraswati’ supercluster is far more distant one. “Our work will help to shed light on the perplexing question; how such extreme large scale, prominent matter-density enhancements had formed billions of years in the past when the mysterious Dark Energy had just started to dominate structure formation,” said Bagchi.

“Saraswati” (or “Sarasvati”), a word that has proto-Indo-European roots, is a name found in ancient Indian texts to refer to the major river around which the people of the ancient Indian civilization lived. It is also the name of the celestial goddess who is the keeper of the celestial rivers. In modern India, Saraswati is worshipped as the goddess of knowledge, music, art, wisdom and nature – the muse of all creativity.

Their finding will be published in the latest issue of The Astrophysical Journal, one of the premier research journals of the American Astronomical Society.[/vc_column_text][/vc_column][/vc_row]

India News

Gyanesh Kumar meets election commissioners amid poll panel row

Chief Election Commissioner Gyanesh Kumar met Election Commissioners Sukhbir Singh Sandhu and Vivek Joshi amid a controversy over reported objections to Election Commission decisions.

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Chief Election Commissioner Gyanesh Kumar held a meeting with Election Commissioners Sukhbir Singh Sandhu and Vivek Joshi amid an ongoing controversy over the functioning and decision-making process of the Election Commission of India.

The meeting comes days after a report raised questions over formal objections allegedly recorded by the two Election Commissioners regarding several decisions and orders of the poll panel.

The Election Commission has maintained that differing views, observations and suggestions are part of its normal deliberative process. It has also said that all decisions taken by the full Commission over the past year were unanimous.

What is the Election Commission controversy?

The controversy followed a report that Election Commissioners Sukhbir Singh Sandhu and Vivek Joshi had raised objections on at least 14 occasions over a 10-month period.

The reported objections included issues concerning changes to Form 6, the handling of additions and deletions from electoral rolls and the centralisation of electoral-roll data.

Form 6 is the statutory form used for applying for registration as a voter.

The Election Commission, however, has disputed the suggestion that the objections amounted to dissent over final decisions. The poll body said written notes, observations, technical suggestions and internal checks and balances are standard parts of its functioning.

ECI says decisions were unanimous

The poll panel has said that all decisions taken by it during the past year were the outcome of unanimous decisions of the full Commission.

It also said that operational queries or inputs raised during the drafting stage are part of the normal administrative process and are intended to improve electoral procedures and safeguard voter rights.

The issue has gained significance because the Election Commission is conducting electoral-roll revisions, including the Special Intensive Revision (SIR), in several parts of the country.

Opposition parties have questioned the functioning of the poll panel and have cited the reported objections by the two Election Commissioners in their criticism of Chief Election Commissioner Gyanesh Kumar.

Political parties seek clarification

The controversy has also prompted calls for greater clarity from political parties, including some parties that are allies of the BJP-led NDA.

LJP (Ram Vilas) chief Chirag Paswan, TDP Lok Sabha floor leader Lavu Srikrishna Devarayalu and Rashtriya Lok Morcha chief Upendra Kushwaha have sought clarification from the Election Commission regarding concerns surrounding the voter-list revision and the reported objections.

The Election Commission has continued to maintain that its decisions have followed the applicable laws, rules and established procedures.

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Gandhi Parivar vs Sangh Parivar, Revanth Reddy’s remark sparks BJP attack

Telangana Chief Minister Revanth Reddy’s remarks contrasting the Gandhi Parivar with the Sangh Parivar triggered a BJP response accusing Congress of prioritising the Gandhi family.

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Telangana Chief Minister Revanth Reddy’s remarks comparing the Gandhi Parivar and Sangh Parivar have triggered a political exchange, with the BJP hitting back at the Congress leader.

Speaking in Kerala on Friday, Mr Reddy described the contest over India’s future as a fight between the two “parivars”. He said the Gandhi family had made sacrifices for the country while accusing the Sangh Parivar of attempting to divide India on the basis of religion, caste, region and language.

What Revanth Reddy said

Mr Reddy cited Mahatma Gandhi, Indira Gandhi and Rajiv Gandhi while speaking about what he described as sacrifices made by the Gandhi family.

He also referred to Sonia Gandhi, Rahul Gandhi and Priyanka Gandhi, saying they had given up positions, power and high office.

The Telangana Chief Minister said he had no remaining personal political ambitions and described his objective as working towards a Congress-led government at the Centre with Rahul Gandhi as Prime Minister.

Mr Reddy also appealed to people to stand with the Gandhi Parivar and oppose the Sangh Parivar. He described the latter as a threat to India’s democracy.

BJP hits back

The BJP responded to Mr Reddy’s remarks on Saturday.

BJP spokesperson Pradeep Bhandari said the Telangana Chief Minister’s comments amounted to an admission that Congress’s objective was to bring the Gandhi family back to power.

He also linked Mr Reddy’s remarks to the ongoing political debate around “vote chori”, the Election Commission, the Constitution and democracy, arguing that the Congress’s focus was instead on the Gandhi family.

The exchange adds to the political confrontation between the BJP and Congress, with Mr Reddy presenting the Gandhi Parivar and Sangh Parivar as opposing forces in India’s political future, while the BJP has interpreted his remarks as evidence of Congress’s focus on the Gandhi family.

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India hits back at Shehbaz Sharif at UN, says terror will have consequences

India hit back at Pakistan Prime Minister Shehbaz Sharif’s UN speech, with New Delhi warning that terrorism will have consequences.

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India has responded to Pakistan Prime Minister Shehbaz Sharif’s remarks at the United Nations, delivering a strong message on terrorism and warning that such actions will have consequences.

The response came after Mr Sharif addressed the UN and raised issues concerning India and Pakistan. New Delhi rejected the narrative presented by the Pakistani prime minister and highlighted the issue of terrorism.

India’s message was delivered by Petal Gehlot, who represented New Delhi in the response to Pakistan.

India warns Pakistan over terrorism

India’s response focused on Pakistan’s record and its approach towards terrorism. New Delhi made clear that terrorism cannot be separated from its consequences and that those responsible cannot expect such actions to go unanswered.

The Indian side also pushed back against the claims and allegations made by Mr Sharif during his UN speech.

The exchange comes amid continuing tensions between India and Pakistan, with terrorism remaining a major point of disagreement between the two countries.

Shehbaz Sharif’s UN remarks

In his address, Pakistan Prime Minister Shehbaz Sharif spoke about India-Pakistan relations and raised several issues concerning New Delhi.

India subsequently exercised its right of reply to respond to Pakistan’s statements at the United Nations.

New Delhi’s response underlined its position that terrorism remains a serious issue in the relationship and that there would be consequences for terrorist actions.

The latest exchange at the UN adds to the continuing diplomatic confrontation between the two neighbouring countries.

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