File:Hubble Captures Massive Dead Disk Galaxy that Challenges Theories of Galaxy Evolution (35451843005).png

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Description	By combining the power of a "natural lens" in space with the capability of NASA's Hubble Space Telescope, astronomers made a surprising discovery—the first example of a compact yet massive, fast-spinning, disk-shaped galaxy that stopped making stars only a few billion years after the big bang. Finding such a galaxy early in the history of the universe challenges the current understanding of how massive galaxies form and evolve, say researchers. Read more: <a href="https://go.nasa.gov/2sWwKkc" rel="nofollow">go.nasa.gov/2sWwKkc</a> caption: Acting as a “natural telescope” in space, the gravity of the extremely massive foreground galaxy cluster MACS J2129-0741 magnifies, brightens, and distorts the far-distant background galaxy MACS2129-1, shown in the top box. The middle box is a blown-up view of the gravitationally lensed galaxy. In the bottom box is a reconstructed image, based on modeling that shows what the galaxy would look like if the galaxy cluster were not present. The galaxy appears red because it is so distant that its light is shifted into the red part of the spectrum. Credits: NASA, ESA, M. Postman (STScI), and the CLASH team NASA image use policy <a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on <a href="https://twitter.com/NASAGoddardPix" rel="nofollow">Twitter</a> Like us on <a href="http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd" rel="nofollow">Facebook</a> Find us on <a href="http://instagrid.me/nasagoddard/?vm=grid" rel="nofollow">Instagram</a>
Date	21 June 2017, 00:00
Source	Hubble Captures Massive Dead Disk Galaxy that Challenges Theories of Galaxy Evolution
Author	NASA Goddard Space Flight Center from Greenbelt, MD, USA

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Headline	Dying Young: Massive Dead Disk Galaxy Challenges the Picture of How Galaxies Evolve
Credit/Provider	NASA, ESA, and S. Toft (University of Copenhagen)
Source	STScI
Short title	Dying Young: Massive Dead Disk Galaxy Challenges the Picture of How Galaxies Evolve
Author	Space Telescope Science Institute Office of Public Outreach
Image title	By combining the power of a “natural lens” in space with the capability of NASA’s Hubble Space Telescope, astronomers made a surprising discovery—the first example of very compact yet massive disk-shaped and rotating galaxy that stopped making stars only a few billion years after the big bang. Finding a galaxy that is pancake-shaped—much like our own Milky Way—so early in the history of the universe challenges the current understanding of how massive galaxies form and evolve, say researchers.The galaxy, called MACS 2129-1, is considered “dead” because it is no longer making stars. The existence of dead galaxies so early—when the universe was just one-quarter its current age—has long been a puzzle, as the Universe at that time was full of gas and at the peak of the cosmic star formation history. The leading theory has been that they formed in galaxy collisions that efficiently drove all the gas into the center of the collision and turned it into stars.“Perhaps we have been blind to the fact that early “dead” galaxies could in fact be disks, simply because we haven’t been able to resolve them,” said study leader Sune Toft of the Dark Cosmology Centre at the Niels Bohr Institute, University of Copenhagen. “This new insight may force us to rethink the whole cosmological context of how galaxies burn out early on and evolve into local elliptical-shaped galaxies.”When the universe was just 3 billion years old, half of the most massive galaxies were extremely compact and had already completed their star formation. Astronomers believe that they ultimately grew into the most massive elliptical galaxies seen in the nearby universe today. Scientists theorize they did this through mergers with small companion galaxies, which added to the stars on the galaxy’s outskirts.Confirming this scenario requires more powerful telescopes than are currently available, whether on Earth or in space. However, through the phenomenon known as “gravitational lensing,” a massive, foreground cluster of galaxies functions as a natural telescope, magnifying and stretching images of far more distant background galaxies. By joining this natural lens with the resolving power of Hubble, scientists were able to see into the center of the dead galaxy.The astronomers expected to see a chaotic ball of stars formed through mergers. Instead, they found a pancake-shaped stellar distribution, meaning that the stars must have been born in a disk. The remote galaxy is three times as massive as the Milky Way but only half the size. Rotational velocity measurements made with the European Southern Observatory’s Very Large Telescope (VLT) showed that the disk galaxy is spinning more than twice as fast as the Milky Way.This is observational evidence that at least some of the earliest “dead” galaxies must have gone through major makeovers, changing not just their structure, but also the motions of their stars, to evolve into the giant elliptical galaxies we see today.Using archival data from the Cluster Lensing And Supernova survey with Hubble (CLASH), Toft and his team were able to determine the stellar mass, star formation rate, and the ages of the stars.“We can see that the star formation stopped first in the center of the galaxy and then moved outwards through the galaxy,” Toft said. “In other words, it died inside out. Until now it had been impossible to resolve them, so we didn’t know if star formation stopped all at once in the whole galaxy, or if it stopped first in the center, or if it stopped first in the outskirts.”Why this galaxy stopped forming stars is still unknown. It may be the result of an active galactic nucleus, where energy is gushing from a supermassive black hole. This energy inhibits star formation. Or it may be the result of “halo quenching,” where, when cold gas tries to stream into the galaxy’s center, it’s rapidly heated. This prevents it from reaching the center and cooling down into star-forming clouds.But how do these young, massive, compact disks evolve into the elliptical galaxies we see in the present-day universe? “Probably through mergers,” Toft said. “If these galaxies grow through merging with minor companions, and these minor companions come in large numbers and from all sorts of different angles onto the galaxy, this would eventually randomize the orbits of stars in the galaxies. You could also imagine major mergers. This would definitely also destroy the ordered motion of the stars.”The findings are published in the June 22 issue of the journal Nature. Toft and his team hope to use NASA’s upcoming James Webb Space Telescope to look for a larger sample of such galaxies.The Hubble Space Telescope is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore conducts Hubble science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, Inc., in Washington, D.C. The Very Large Telescope is a telescope facility operated by the European Southern Observatory on Cerro Paranal in the Atacama Desert of Northern Chile.
Usage terms	http://hubblesite.org/copyright/
Date and time of data generation	00:00, 21 June 2017
Width	4,425 px
Height	3,977 px
Pixel composition	RGB
Number of components	3
Horizontal resolution	300 dpi
Vertical resolution	300 dpi
Color space	sRGB
Image width	4,425 px
Image height	3,977 px
Bits per component	8 8 8
Software used	Adobe Photoshop CC 2017 (Macintosh)
Date and time of digitizing	09:03, 8 June 2017
File change date and time	11:48, 16 June 2017
Date metadata was last modified	11:51, 16 June 2017
Unique ID of original document	xmp.did:bb9d8ccf-59d9-4f45-94f8-19cb3b9e654f
Keywords	MACS J2129-0741 MACS2129-1
Contact information	outreach@stsci.edu http://hubblesite.org 3700 San Martin Drive Baltimore, MD, 21218 USA 410-338-4444

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