The Daily Galaxy
Thu, 09 Jun 2016 16:11 UTC


© NASA
Artist impression of a magnetar


Astronomers were not entirely sure what it is. If, as they suspect, the gas ball is the result of a supernova, then it's the most powerful supernova ever seen. In June of 2015, astronomers viewed a ball of hot gas billions of light years away that is radiating the energy of hundreds of billions of suns.

Even in a discipline that regularly uses gigantic numbers to express size or distance, the case of this small but powerful mystery object in the center of the gas ball is extreme. At its heart is an object a little larger than 10 miles across. ASAS-SN-15lh, as the object is known, was twice as luminous as any previously seen, far brighter than any normal supernova, and outshone our entire Milky Way galaxy by 50 times.

The artist's impression below shows what it would look like from an exoplanet 10,000 light-years away in its home galaxy.
© Beijing Planetarium / Jin Ma

The team reported that the object at the center could be a very rare type of star called a magnetar--but one so powerful that it pushes the energy limits allowed by physics. (**wouldn't that mean their physics is wrong then? ) An international team of professional and amateur astronomers spotted the possible supernova, now called ASASSN-15lh, when it first flared to life in June 2015.

The gas ball surrounding the object can't be seen with the naked eye, because it's 3.8 billion light years away. But it was spotted by the All Sky Automated Survey for Supernovae (ASAS-SN, pronounced "assassin") collaboration. Led by Ohio State, the project uses a cadre of small telescopes around the world to detect bright objects in our local universe.

Though ASAS-SN has discovered some 250 supernovae since the collaboration began in 2014, the explosion that powered ASASSN-15lh stands out for its sheer magnitude. It is 200 times more powerful than the average supernova, 570 billion times brighter than our sun, and 20 times brighter than all the stars in our Milky Way Galaxy combined.

"We have to ask, how is that even possible?" said Krzysztof Stanek, professor of astronomy at Ohio State. "It takes a lot of energy to shine that bright, and that energy has to come from somewhere."

"The honest answer is at this point that we do not know what could be the power source for ASASSN-15lh," said Subo Dong, lead author of the Science paper and a Youth Qianren Research Professor of astronomy at the Kavli Institute for Astronomy and Astrophysics at Peking University. He added that the discovery "may lead to new thinking and new observations of the whole class of superluminous supernova."

Todd Thompson, professor of astronomy at Ohio State, offered one possible explanation. The supernova could have spawned an extremely rare type of star called a millisecond magnetar, a rapidly spinning and very dense star with a very strong magnetic field.

To shine so bright, this particular magnetar would also have to spin at least 1,000 times a second, and convert all that rotational energy to light with nearly 100 percent efficiency, Thompson explained. It would be the most extreme example of a magnetar that scientists believe to be physically possible. "Given those constraints," he said, "will we ever see anything more luminous than this? If it truly is a magnetar, then the answer is basically no."

The Hubble Space Telescope will help settle the question later this year, in part because it will allow astronomers to see the host galaxy surrounding the object. If the team finds that the object lies in the very center of a large galaxy, then perhaps it's not a magnetar at all, and the gas around it is not evidence of a supernova, but instead some unusual nuclear activity around a supermassive black hole.

If so, then its bright light could herald a completely new kind of event, said study co-author Christopher Kochanek, professor of astronomy at Ohio State and the Ohio Eminent Scholar in Observational Cosmology. It would be something never before seen in the center of a galaxy.

Via Ohio State University

There are times i've seen a very bright star light object like that & it was sparkling & displaying a variety of colours for very brief moments, it wasn't moving tho

the upper atmosphere movements makes the planets/stars twinkle like that...

thats why you see lasers shooting up from the bigger telescopes, to compensate for it...

Just wow.
Tis why I find it all so scary..so much unknown,
yet all about our pre-existence.

Sure hope you update us with Hubble.

it says 6 months away... imagine if that was just a few thousand light years away, might be hotter than the suns rays...

I know huh, I can't imagine this yet:
"..570 billion times brighter than our sun.."

I mean, 2 times brighter would wipe us out :-)

crazy calculations for sure, since it's billions of light years away...with that much math and variables involved, i just can't see them being 100% right...

i'm thinking maybe the jets are pointed directly at us...

something like this:

Wait a minute I thought I was the brightest thing in the known universe..lol