A letter to the Press Council of India on Hyderabad blasts coverage

Leiden, Jul 2: Astronomers have discovered a luminous galaxy caught in the act of reionizing its surrounding gas only 800 million years after the Big Bang.

The research, led by Romain Meyer, PhD student at UCL in London, UK, has been presented at the virtual annual meeting of the European Astronomical Society (EAS).

Studying the first galaxies that formed 13 billion years ago is essential to understanding our cosmic origins. One of the current hot topics in extragalactic astronomy is 'cosmic reionization,' the process in which the intergalactic gas was ionized (atoms stripped of their electrons).

Cosmic reionization is similar to an unsolved murder: We have clear evidence for it, but who did it, how and when? We now have strong evidence that hydrogen reionization was completed about 13 billion years ago, in the first billion years of the universe, with bubbles of ionized gas slowly growing and overlapping.

The objects capable of creating such ionized hydrogen bubbles have however remained mysterious until now: the discovery of a luminous galaxy in which 60-100 percent of ionizing photons escape, is likely responsible for ionizing its local bubble. This suggests the case is closer to being solved.

The two main suspects for cosmic reionization are usually 1) a population of numerous faint galaxies leaking ~10 percent of their energetic photons, and 2) an 'oligarchy' of luminous galaxies with a much larger percentage (>50 percent) of photons escaping each galaxy.

In either case, these first galaxies were very different from those today: galaxies in the local universe are very inefficient leakers, with only <2-3 percent of ionizing photons escaping their host. To understand which galaxies governed cosmic reionization, astronomers must measure the so-called escape fractions of galaxies in the reionization era.

The detection of light from excited hydrogen atoms (the so-called Lyman-alpha line) can be used to infer the fraction of escaping photons. On the one hand, such detections are rare because reionization-era galaxies are surrounded by neutral gas which absorbs that signature hydrogen emission.

On the other hand, if this hydrogen signal is detected it represents a 'smoking gun' for a large ionized bubble, meaning we have caught a galaxy reionizing its surroundings. The size of the bubble and the galaxy's luminosity determines whether it is solely responsible for creating this ionized bubble or if unseen accomplices are necessary.

The discovery of a luminous galaxy 800 million years after the Big Bang supports the scenario where an 'oligarchy' of bright leakers emits most of the ionizing photons.

"It is the first time we can point to an object responsible for creating an ionized bubble, without the need for a contribution from unseen galaxies.

Additional observations with the upcoming James Webb Space Telescope will enable us to study further what is likely one of the best suspects for the unsolved case of cosmic reionization," said Meyer.

Citing the current dismal aviation scenario, Air India is terminating the services of trainee cabin crew and cabin crew by withdrawing the offer of employment of those who were under training.

As per sources, the new crew and trainee pilots might reduce contracts from five years to one year. Sources said Air India is terminating 1,200 crew and employees who are more than 55-yr-old including 190 trainee pilots.

In a letter reviewed by IANS, Air India has informed an applicant who had been selected as cabin crew in August 2019 subject to successful completion of training.

"On behalf of Air India we would like to thank you for the interest shown by you in joining our organization. However, in view of the current aviation scenario, it would not be possible for Air India to impart any further training to you for engaging your services," the company said.

"In view of the above reasons, which are beyond the control of the company, it has been decided to discontinue your training arrangements and dispense with the offer of engagement with immediate effect. The bank guarantee furnished by you at the time of joining is returned herewith," Air India told the cabin crew.

"Once again on behalf of Air India we thank you for your cooperation and trust that you will appreciate the circumstances under which we are constrained to discontinue the training arrangements," the carrier said.

New Delhi, Feb 26: With the government pushing for the disinvestment of Air India, industrial conglomerate Adani Group may emerge as one of the bidders for the debt-laden national carrier, sources said.

According to highly placed sources, the Group has held internal rounds of deliberations on whether or not to submit an Expression of Interest (EoI) and the discussions are still in the preliminary stage.

If the company actually submits an EoI, it would be a major move towards further diversification of the company which has business interests across sectors right from edible oil, food to mining and minerals. 

It also entered into airport operations and maintenance business and won bids for privatisation of six airports, Ahmedabad, Lucknow, Jaipur, Guwahati, Thiruvananthapuram and Mangaluru in 2019. 

On being contacted by IANS, the company did not comment on the matter.

Air India is one of the most important divestment proposals for the current fiscal to reach the huge Rs 2.1 lakh crore target.

The government in January restarted the divestment process of the airline and invited bids for selling 100 per cent of its equity in the state-owned airline, including Air India's 100 per cent shareholding in AI Express Ltd. and 50 per cent in Air India SATS Airport Services Private Ltd.

After its unsuccessful bid to sell Air India in 2018, the government this time has decided to offload its entire stake. In 2018, it had offered to sell its 76 per cent stake in the airline.

Of the total debt of Rs 60,074 crore as of March 31, 2019, the buyer would be required to absorb Rs 23,286 crore.

Air India, along with its subsidiary Air India Express, has a total operational fleet of 146 aeroplanes.

Further, the disinvestment department has extended the last date for submission of written queries on the Performance Information Memorandum and Share Purchase Agreement to March 6.

The last date for submission of written queries on PIM and SPA was originally set for February 11, following which the Department of Investment and Public Asset Management (DIPAM) on February 21 issued 20 clarifications on the queries raised and expected.

Any delay in the tentatively rolled out timeline would also delay DIPAM's plan to identify the pre-qualified bidders by March 31 and the financial bids invitation as well. It is expected to take more than two months after the selection of the pre-qualified bidders to complete Air India's sale.