Astronomers make a remarkable discovery in the center of the Milky Way

[n2doc]

https://img.washingtonpost.com/wp-apps/imrs.php?src=
The young stars (red dots) slice across the center of the galaxy in this artist's rendering. The yellow star indicates our sun. (ESO/Microsoft WorldWide Telescope)


Scientists have found a brand new feature at the center of our own galaxy — a disk of young stars hidden in with the old-timers.

Until now, astronomers thought that the bulge at the center of the Milky Way contained only ancient stars. In fact, it seemed that all of that region's star-making materials had been used up ages ago. But in a paper published Wednesday in the Astrophysical Journal Letters, researchers announce that the bulge apparently has kept making stars.

The researchers found this by studying variable stars called Cepheids. They're useful to study, because they brighten and dim periodically, and one can infer their distance based on the length of this cycle. That allows them to be used as distance markers for other objects. A survey using the European Southern Observatory's VISTA telescope — which can cut through the thick dust of the galaxy using infrared — collected images meant to capture these and other variable stars, and the authors of the new study found their bright young things by analyzing several years of the data.

Of the 655 Cepheids they found, they were surprised to note that 35 of them were so-called classical Cepheids — a subtype of young stars.

They were even more surprised when they mapped the young stars and realized that they were forming a disk feature across the center bulge of the Milky Way.

"All of the 35 classical Cepheids discovered are less than 100 million years old. The youngest Cepheid may even be only around 25 million years old, although we cannot exclude the possible presence of even younger and brighter Cepheids," Dante Minniti of the Universidad Andres Bello, the study's second author, said in a statement.

https://www.washingtonpost.com/news/speaking-of-science/wp/2015/10/28/astronomers-make-a-remarkable-discovery-in-the-center-of-the-milky-way/

[bvar22]

1. Could our galaxy (and all galaxies) be self-regenerating?

New stars from the ones that have blown themselves to dust?

Its been a long time since I've been to school. I was taught then that galaxies are born and die.
That a galaxy could be self-regenerating blows my mind. a new a fascinating idea to me. I'll probably spend all day on it.

[BadgerKid]

2. Could stars be born in accretion disks of black holes?

I'm not at all sure if the timing works out thought, i.e., is there enough time for stars to form around black holes before they are ingested by the black hole?