Hubble Captures Gargantuan 'Cosmic Fossil'
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November 25, 2012

Hubble Captures Gargantuan 'Cosmic Fossil'

 

           Elliptical-Galaxy-NGC-1132

 

The Hubble Space Telescope captured an image of a galaxy located approximately 320 million light-years away in the constellation of Eridanus, the River, which is, most likely, a cosmic fossil – the aftermath of an enormous multi-galactic pile-up, where the carnage of collision after collision has built up a brilliant giant elliptical galaxy far outshining typical galaxies.

Scientists have found that NGC 1132 resides in an enormous halo of dark matter, comparable to the amount of dark matter usually found in an entire group of tens or hundreds of galaxies.

Galaxy NGC 1132, seen in this latest image from Hubble, belongs to a category of galaxies called giant ellipticals. NGC 1132, together with the small dwarf galaxies surrounding it, are dubbed a “fossil group” as they are most likely the remains of a group of galaxies that merged together in the recent past.

The origin of fossil group systems remains a puzzle. The most likely explanation is that they are the end-products of a cosmic feeding frenzy in which a large cannibal galaxy devours all of its neighbors. A less likely explanation is that they may be very rare objects that formed in a region or period of time where the growth of moderate-sized galaxies was somehow suppressed, and only one large galaxy formed.

There is strong evidence that the Milky Way is one such cannibal that has snacked on numerous smaller galaxies during its lifetime, inheriting their stars in the process. Scientists are keenly studying the environment surrounding galaxies such as NGC 1132 using space telescopes like Hubble, and they try to trace the history of the formation these galaxies by analysing their properties.

In this Hubble image, NGC 1132 is seen surrounded by thousands of ancient globular clusters, swarming around the galaxy like bees around a hive. These globular clusters are likely to be the survivors of the disruption of their cannibalized parent galaxies that have been eaten by NGC 1132 and may reveal its merger history. In the background, there is a stunning tapestry of numerous galaxies that are much further away.

Elliptical galaxies are smooth and featureless. They contain hundreds of millions to trillions of stars, and their shapes range from nearly spherical to very elongated in shape. Their overall yellowish color is a telltale sign of their great age. Because elliptical galaxies do not contain much cool gas they can no longer make new stars.

The Daily Galaxy via Hubble/NASA

Hubble image at top of the page of elliptical galaxy NGC 1132 is from NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration

Comments

There MUST be some kind of intelligent life in that huge galaxy. The problem is that if they tried to communicate with us, their signal would take 350 million years to reach us.

Luckily that event took place so long ago it must be cleared by now, no more messy cloud pile up and no more dust.

@ Peter Smitt. We cannot assume that any intelligent civilization formed even 1000 years before us would be using communications bound by the speed of light. They would likely be using quantum forms of communication. Bypassing the cosmic speed limit altogether. They would likely also be doing that for exploration, current propulsion technologies like the rockets we use, are probably the lowest and most inefficient form of travel available. Creating and manipulating you're own gravitational fields is where its at. Once you attain that ability the entire universe becomes you're playground.


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