-0.7 C
New York
Tuesday 30 November 2021

Buy now

Ad

HomeEducationAstronomers confirm faintest early-universe galaxy ever seen

Astronomers confirm faintest early-universe galaxy ever seen

|

University of California – Los Angeles: An international team of scientists, including two professors and three graduate students from UCLA, has detected and confirmed the faintest early-universe galaxy ever. Using the W. M. Keck Observatory on the summit on Mauna Kea in Hawaii, the researchers detected the galaxy as it was 13 billion years ago. The results were published in the Astrophysical Journal Letters.

Tommaso Treu, a of physics and astronomy in the UCLA College and a co-author of the research, said the discovery could be a step toward unraveling one of the biggest mysteries in astronomy: how a period known as the “cosmic dark ages” ended.

Composite image of the galaxy cluster from three different filters on the Hubble Space Telescope. The wave charts (insets at left) show spectra of the multiply imaged systems. The fact that they share peaks at the same wavelength shows that they belong to the same source. At bottom right, the Keck I and Keck II Telescopes at Hawaii’s the W. M. Keck Observatory. Credit: BRADAC/HST/W. M. Keck Observatory

The researchers made the discovery using an effect called gravitational lensing to see the incredibly faint object, which was born just after the Big Bang. Gravitational lensing was first predicted by Albert Einstein almost a century ago; the effect is similar to that of an image behind a glass lens appearing distorted because of how the lens bends light.

The detected galaxy was behind a galaxy cluster known as MACS2129.4-0741, which is massive enough to create three different images of the galaxy.

According to the Big Bang theory, the universe cooled as it expanded. As that happened, Treu said, protons captured electrons to form hydrogen atoms, which in turn made the universe opaque to radiation — giving rise to the cosmic dark ages.

“At some point, a few hundred million years later, the first stars formed and they started to produce ultraviolet light capable of ionizing hydrogen. Eventually, when there were enough stars, they might have been able to ionize all of the intergalactic hydrogen and create the universe as we see it now.” – Tommaso Treu, of physics and astronomy, UCLA

That process, called cosmic reionization, happened about 13 billion years ago, but scientists have so far been unable to determine whether there were enough stars to do it or whether more exotic sources, like gas falling onto supermassive black holes, might have been responsible.

“Currently, the most likely suspect is stars within faint galaxies that are too faint to see with our telescopes without gravitational lensing magnification,” Treu said. “This study exploits gravitational lensing to demonstrate that such galaxies exist, and is thus an important step toward solving this mystery.”

The research team was led by Marusa Bradac, a at UC Davis. Co-authors include Matthew Malkan, a UCLA professor of physics and astronomy, and UCLA graduate students Charlotte Mason, Takahiro Morishita and Xin Wang.

The galaxy’s magnified spectra were detected independently by both Keck Observatory and Hubble Space Telescope data.

Source: University of California – Los Angeles.

Journal: Kuang-Han Huang, Brian C. Lemaux, Kasper B. Schmidt, Austin Hoag, Maruša Bradač, Tommaso Treu, Mark Dijkstra, Adriano Fontana, Alaina Henry, Matthew Malkan, Charlotte Mason, Takahiro Morishita, Laura Pentericci, Russell E. Ryan, Michele Trenti, Xin Wang. DETECTION OF LYMAN-ALPHA EMISSION FROM A TRIPLY IMAGEDz= 6.85 GALAXY BEHIND MACS J2129.4−0741. The Astrophysical Journal, 2016; 823 (1): L14 DOI: 10.3847/2041-8205/823/1/L14

Sirf News needs to recruit journalists in large numbers to increase the volume of its reports and articles to at least 100 a day, which will make us mainstream, which is necessary to challenge the anti-India discourse by established media houses. Besides there are monthly liabilities like the subscription fees of news agencies, the cost of a dedicated server, office maintenance, marketing expenses, etc. Donation is our only source of income. Please serve the cause of the nation by donating generously.

Support pro-India journalism by donating

via UPI to surajit.dasgupta@icici or

via PayTM to 9650444033

OMICRON CONCERNS
Health Secretary Rajesh Bhushan has emphasised in the Centre's COVID review meet with the states, that Omicron does not escape RT-PCR or rapid antigen testing. States have been asked to ramp up testing, screening & home isolation. Times Network’s Sherine reports!

#COVID19 | Today’s Vaccination Update - The latest #CovidVaccination equation for Tuesday, November 30.

.@BJP4MP के सोशल मीडिया विभाग के प्रदेश संयोजक श्री अभिषेक शर्मा जी को जन्मदिन की हार्दिक शुभकामनाएँ।

आप सदैव स्वस्थ रहे,प्रशन्न रहे यही ईश्वर से कामना। @SharmaaAbhishek

कहीं सुना था कि दुनिया का सबसे छोटा संविधान अमेरिका का है - महज 13 पन्नों का!

लेकिन यह सूचना गलत निकली
वास्तव में दुनिया का सबसे छोटा संविधान हमारे योगी बाबा का है -

बस दो लाइन का :
कायदे में रहोगे तो फायदे में रहोगे!
😆😆

Read further:

This site uses Akismet to reduce spam. Learn how your comment data is processed.

- Advertisment -

Now

Columns

[prisna-google-website-translator]
%d bloggers like this: