by Staff Writers
Boston MA (SPX) Nov 22, 2016
A snapshot of the stellar life cycle has been captured in a new portrait from NASA's Chandra X-ray Observatory and the Smithsonian's Submillimeter Array (SMA). A cloud that is giving birth to stars has been observed to reflect X-rays from Cygnus X-3, a source of X-rays produced by a system where a massive star is slowly being eaten by its companion black hole or neutron star. This discovery provides a new way to study how stars form.
In 2003, astronomers used Chandra's high-resolution X-ray vision to find a mysterious source of X-ray emission located very close to Cygnus X-3. The separation of these two sources on the sky is equivalent to the width of a penny at a distance of 830 feet away. In 2013, astronomers reported that the new source is a cloud of gas and dust.
In astronomical terms, this cloud is rather small - about 0.7 light-year in diameter. Astronomers realized that this cloud was acting as a mirror, reflecting some of the X-rays generated by Cygnus X-3 towards Earth.
"We nicknamed this object the 'Little Friend' because it is a faint source of X-rays next to a very bright source that showed similar X-ray variations," said Michael McCollough of the Harvard-Smithsonian Center for Astrophysics (CfA) in Cambridge, Massachusetts, who led the most recent study of this system.
The Chandra observations reported in 2013 suggested that the Little Friend had a mass between two and 24 times that of the Sun. This suggested that the cloud was a "Bok globule," a small dense cloud where infant stars can be born. However, more evidence was needed.
To determine the nature of the Little Friend, astronomers used the SMA, a series of eight radio dishes atop Maunakea in Hawaii. The SMA found molecules of carbon monoxide, an important clue that the Little Friend is indeed a Bok globule. Also, the SMA data reveals the presence of a jet or outflow within the Little Friend, an indication that a star has started to form inside.
"Typically, astronomers study Bok globules by looking at the visible light they block or the radio emission they produce," said co-author Lia Corrales of the Massachusetts Institute of Technology in Cambridge, Mass. "With the Little Friend, we can examine this interstellar cocoon in a new way using X-rays - the first time we have ever been able to do this with a Bok globule."
At an estimated distance of almost 20,000 light-years from Earth, the Little Friend is also the most distant Bok globule yet seen.
The properties of Cygnus X-3 and its proximity to the Little Friend also give an opportunity to make a precise distance measurement - something that is often very difficult in astronomy. Since the early 1970s, astronomers have observed a regular 4.8-hour variation in the X-rays from Cygnus X-3. The Little Friend, acting as an X-ray mirror, shows the same variation, but slightly delayed because the path the reflected X-rays take is longer than a straight line from Cygnus X-3 to Earth.
By measuring the delay time in the periodic variation between Cygnus X-3 and the Little Friend, astronomers were able to calculate the distance from Earth to Cygnus X-3 of about 24,000 light-years.
Because Cygnus X-3 contains a massive, short-lived star, scientists think it must have originated in a region of the galaxy where stars are still likely to be forming. These regions are only found in the Milky Way's spiral arms. However, Cygnus X-3 is located outside any of the Milky Way's spiral arms.
"In some ways it's a surprise that we find Cygnus X-3 where we do," said co-author Michael Dunham of CfA and the State University of New York at Fredonia. "We realized something rather unusual needed to happen during its early years to send it on a wild ride."
The researchers suggest that the supernova explosion that formed either the black hole or neutron star in Cygnus X-3 kicked the binary system away from its original birthplace. Assuming that Cygnus X-3 and the Little Friend formed near each other, they estimate that Cygnus X-3 must have been thrown out at speeds between 400,000 and 2 million miles per hour.
"Cygnus X-3: Its Little Friend's Counterpart, the Distance to Cygnus X-3, and Outflows/Jets," Michael McCollough, Lia Corrales and Michael Dunham, 2016 Oct. 20, Astrophysical Journal Letters
Chandra X-Ray Center
Stellar Chemistry, The Universe And All Within It
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|