The Story of the Cosmos - Dawn of the cosmos: Seeing galaxies that appeared soon after the Big Bang

cosmos page header

 

 

 

Dawn of the cosmos: Seeing galaxies that appeared soon after the Big Bang


 

cosmos


 

Milestones in the history of the Universe (not to scale). The intergalactic gas was in a neutral state from about 300,000 years after the Big Bang until light from the first generation of stars and galaxies began to ionize it. The gas was completely ionized after 1 billion years. The LAGER study takes a close look at the state of the Universe at 800 million years (yellow box) to investigate when and how this transformation occurred.

 

Credit: National Astronomical Observatory of Japan

 

View Sample Video - Cosmology - Universe - Beyond the Big Bang

 

 

 

SD-VIDEO-DOWNLOAD.jpg

 

 

Related Video Content

 

Cosmology - Universe - Beyond the Big Bang.mp4
Cosmology - Universe - Birth and Death of Stars.webm
Cosmology - Universe - Cosmic Calendar.mp4
Cosmology - Universe - Cosmic Inflation.webm
Cosmology - Universe - Dark Matter and Dark Energy.mp4
Cosmology - Universe - Death of the Universe.mp4
Cosmology - Universe - Death Stars and their Threat to Earth.mp4
Cosmology - Universe - Do You Know What Time It Is.mp4
Cosmology - Universe - God and the Universe.mp4
Cosmology - Universe - Gravity.mp4
Cosmology - Universe - How Large is the Universe.mp4
Cosmology - Universe - Is There An Edge To the Universe.webm
Cosmology - Universe - Journey Through the Milky Way.mp4
Cosmology - Universe - Journey To The Edge Of The Universe.mp4
Cosmology - Universe - Light Speed.webm
Cosmology - Universe - Mapping the Universe.flv
Cosmology - Universe - Milky Way Galaxy Formation - Simulation.webm
Cosmology - Universe - Most of the Universe is missing.mp4
Cosmology - Universe - Nebulae.webm
Cosmology - Universe - Our Place In The Milky Way.webm
Cosmology - Universe - Parallel Universes.webm
Cosmology - Universe - Pulsars and Quasars.webm
Cosmology - Universe - Seven Ages of Starlight.webm
Cosmology - Universe - Supernovae.webm
Cosmology - Universe - The Energy of Empty Space.mp4
Cosmology - Universe - The Multiverse Theory.webm
Cosmology - Universe - The Platonic Solids.mp4
Cosmology - Universe - The Riddle of Anti Matter.mp4
Cosmology - Universe - Voyager Golden Record.mp4
Cosmology - Universe - What happened before the beginning.webm
Cosmology - Universe - What happened before the Big Bang.mp4
Cosmology - Universe - What is Reality.mp4
Cosmology - Universe - What on Earth is Wrong With Gravity.mp4

 

Video-Catalogue.jpg

 

View Sample Video - Cosmology - Universe - Journey To The Edge Of The Universe

 

 

Arizona State University astronomers Sangeeta Malhotra and James Rhoads, working with international teams in Chile and China, have discovered 23 young galaxies, seen as they were 800 million years after the Big Bang. The results from this sample have been recently published in the Astrophysical Journal.

 

Long ago, about 300,000 years after the beginning of the universe (the Big Bang), the universe was dark. There were no stars or galaxies, and the universe was filled with neutral hydrogen gas. In the next half billion years or so the first galaxies and stars appeared. Their energetic radiation ionized their surroundings, illuminating and transforming the universe.

 

This dramatic transformation, known as re-ionization, occurred sometime in the interval between 300 million years and one billion years after the Big Bang. Astronomers are trying to pinpoint this milestone more precisely and the galaxies found in this study help in this determination.

 

"Before re-ionization, these galaxies were very hard to see, because their light is scattered by gas between galaxies, like a car's headlights in fog," says Malhotra. "As enough galaxies turn on and 'burn off the fog' they become easier to see. By doing so, they help provide a diagnostic to see how much of the 'fog' remains at any time in the early universe."

 

cosmos banner

 

Cosmos - Site Search - Get Your Answer Here

 Latest News & Extensive Reference Library

 

Google-Verified-Reviews.jpg
Latest-News.jpg
Video-Catalogue.jpg

 

The Dark Energy Camera

 

To detect these galaxies, Malhotra and Rhoads have been using the Dark Energy Camera (DECam), one of the new powerful instruments in the astronomy field. DECam is installed at the National Optical Astronomy Observatory (NOAO)'s 4-meter Blanco Telescope, located at the Cerro Tololo Inter-American Observatory (CTIO), in northern Chile, at an altitude of 7,200 feet.

 

"Several years ago, we carried out a similar study using a 64-megapixel camera that covers the same amount of sky as the full moon," says Rhoads. "DECam, by comparison, is a 570-megapixel camera and covers 15 times the area of the full moon in a single image."

 

DECam was recently made even more powerful when it was equipped with a special narrowband filter, designed at ASU's School of Earth and Space Exploration (SESE), primarily by Rhoads and Zheng (who was a SESE postdoctoral fellow and is currently at the Shanghai Astronomical Observatory in China), with assistance from Alistair Walker of NOAO.

 

"We spent several months refining the design of the filter profile, optimizing the design to get maximum sensitivity in our search" says Zheng, the lead author of this study.

 

Touching the Cosmic Dawn

 

The galaxy search using the ASU-designed filter and DECam is part of the ongoing "Lyman Alpha Galaxies in the Epoch of Reionization" project (LAGER). It is the largest uniformly selected sample that goes far enough back in the history of the universe to reach cosmic dawn.

 

"The combination of large survey size and sensitivity of this survey enables us to study galaxies that are common but faint, as well as those that are bright but rare, at this early stage in the universe," says Malhotra.

 

Junxian Wang, a co-author on this study and the lead of the Chinese LAGER team, adds that "our findings in this survey imply that a large fraction of the first galaxies that ionized and illuminated the universe formed early, less than 800 million years after the Big Bang."

 

The next steps for the team will be to build on these results. They plan to continue to search for distant star forming galaxies over a larger volume of the universe and to further investigate the nature of some of the first galaxies in the universe.

 


Story Source:

Materials provided by Arizona State University

 

 

cosmos banner

 

 

Cosmos - Site Search - Get Your Answer Here

 Latest News & Extensive Reference Library

 

Google-Verified-Reviews.jpg
Latest-News.jpg
Video-Catalogue.jpg

PayPal - Streaming - 2018-01-08

 

 

 

 

 

 

 

 

 

PayPal - Streaming - 2018-01-08

 

vid Image

 

Sample Video - Cosmology - Universe - How Large is the Universe

PayPal - Streaming - 2018-01-08

 

 

Related Video Content

 

Cosmology - Universe - Beyond the Big Bang.mp4
Cosmology - Universe - Birth and Death of Stars.webm
Cosmology - Universe - Cosmic Calendar.mp4
Cosmology - Universe - Cosmic Inflation.webm
Cosmology - Universe - Dark Matter and Dark Energy.mp4
Cosmology - Universe - Death of the Universe.mp4
Cosmology - Universe - Death Stars and their Threat to Earth.mp4
Cosmology - Universe - Do You Know What Time It Is.mp4
Cosmology - Universe - God and the Universe.mp4
Cosmology - Universe - Gravity.mp4
Cosmology - Universe - How Large is the Universe.mp4
Cosmology - Universe - Is There An Edge To the Universe.webm
Cosmology - Universe - Journey Through the Milky Way.mp4
Cosmology - Universe - Journey To The Edge Of The Universe.mp4
Cosmology - Universe - Light Speed.webm
Cosmology - Universe - Mapping the Universe.flv
Cosmology - Universe - Milky Way Galaxy Formation - Simulation.webm
Cosmology - Universe - Most of the Universe is missing.mp4
Cosmology - Universe - Nebulae.webm
Cosmology - Universe - Our Place In The Milky Way.webm
Cosmology - Universe - Parallel Universes.webm
Cosmology - Universe - Pulsars and Quasars.webm
Cosmology - Universe - Seven Ages of Starlight.webm
Cosmology - Universe - Supernovae.webm
Cosmology - Universe - The Energy of Empty Space.mp4
Cosmology - Universe - The Multiverse Theory.webm
Cosmology - Universe - The Platonic Solids.mp4
Cosmology - Universe - The Riddle of Anti Matter.mp4
Cosmology - Universe - Voyager Golden Record.mp4
Cosmology - Universe - What happened before the beginning.webm
Cosmology - Universe - What happened before the Big Bang.mp4
Cosmology - Universe - What is Reality.mp4
Cosmology - Universe - What on Earth is Wrong With Gravity.mp4