A new view of a 20,000-year old supernova remnant demonstrates the upgraded imaging power of the National Science Foundation's (NSF) Karl G. Jansky Very Large Array (VLA) and provides more clues to the history of this giant cloud that resembles a beloved endangered species, the Florida Manatee.
W50 is one of the largest supernova remnants ever viewed by the VLA. At nearly 700 light years across, it covers two degrees on the sky – that's the span of four full Moons!
The enormous W50 cloud formed when a giant star, 18,000 light years away in the constellation of Aquila, exploded as a supernova around twenty thousand years ago, sending its outer gases flying outward in an expanding bubble.
The remaining, gravitationally-crushed relic of that giant star, most likely a black hole, feeds on gas from a very close, companion star. The cannibalized gas collects in a disk around the black hole. The disk and black hole's network of powerful magnetic field lines acts like an enormous railroad system to snag charged particles out of the disk and channel them outward in powerful jets traveling at nearly the speed of light. This system of a black hole and its feeder star shines brightly in both radio waves and X-rays and is known collectively as the SS433 microquasar.
Over time, the microquasar's jets have forced their way through the expanding gases of the W50 bubble, eventually punching bulges outward on either side. The jets also wobble, like an unstable spinning top, and blaze vivid corkscrew patterns across the inflating bulges.
Optically bright astronomical objects, those visible to the eye and optical telescopes, often are nicknamed for their earthly likenesses, such as the Whirlpool Galaxy and Owl Nebula. Invisible W50 comes by its less catchy name by being the 50th radio source listed in the Westerhout Catalog, assembled in 1958 by Dutch astronomer, Gart Westerhout.
When the VLA's giant W50 image reached the NRAO Director's office, Heidi Winter, the Director's Executive Assistant, saw the likeness to a manatee, the endangered marine mammals known as "sea cows" that congregate in warm waters in the southeastern United States.
Florida Manatees are gentle giants that average around 10 feet long, weigh over 1000 pounds, and spend up to eight hours a day grazing on sea plants. They occupy the remainder of their day resting, often on their backs with their flippers crossed over their large bellies, in a pose closely resembling W50.
Dangerous encounters with boat propellers injure many of these curious herbivores, giving them deep, curved scars similar in appearance to the arcs made by the powerful jets on the large W50 remnant.
Thanks to Ms. Winter's suggestion, the National Radio Astronomy Observatory has adopted a new nickname for W50: The Manatee Nebula. In collaboration with the U.S. Fish and Wildlife Service, the NRAO will unveil the Manatee Nebula to the public during the annual Manatee Festival in Crystal River, Florida on a stage overlooking the largest natural concentration of wintering manatees in the world.
National Radio Astronomy Observatory: http://www.nrao.edu
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
New research from NASA shows that the Arctic Ocean has been steadily getting more energy from the sun over the past fifteen years.
Nasa's Orbiting Carbon Observatory produces its first global maps of carbon dioxide in Earth's atmosphere.
Plumes of water from Jupiter's moon Europa have not reappeared since their discovery – and evidence now suggests they may not have existed to begin with
The Kepler space telescope, which cost some $600 million, was feared to be at the end of its useful life in 2013. But NASA says it just found another exoplanet.
An asteroid-mining company has unveiled plans for a new mothership spacecraft designed to carry a dozen small probes to explore asteroids, comets, or even the moon. The mothership, designed by Deep Space Industries, is about 3 feet in diameter and 1.5 feet tall, weighing about 330 pounds.
The creeping movement of the ground in California's Napa Valley, following its August earthquake, has been observed from space.
We can now grow plants in microgravity – and crops grown in asteroid soil could sustain vast human populations off-planet
After space station resupply launch, engineers will try to land part of a SpaceX rocket on an offshore barge for possible reuse
Cities are brighter during the holidays than any other time in the year
Streams of shooting stars delighted stargazers around the world over the weekend as the Geminids meteor shower hit its peak